^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 1991, 1992 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * 2000-2002 x86-64 support by Andi Kleen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/personality.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/user-return-notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/uprobes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/context_tracking.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/entry-common.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <asm/ucontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <asm/fpu/internal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <asm/fpu/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <asm/vdso.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <asm/mce.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <asm/sighandling.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <asm/vm86.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #ifdef CONFIG_X86_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <asm/proto.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <asm/ia32_unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #endif /* CONFIG_X86_64 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <asm/syscall.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <asm/sigframe.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <asm/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #ifdef CONFIG_X86_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * If regs->ss will cause an IRET fault, change it. Otherwise leave it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * alone. Using this generally makes no sense unless
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * user_64bit_mode(regs) would return true.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static void force_valid_ss(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) u32 ar;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) asm volatile ("lar %[old_ss], %[ar]\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) "jz 1f\n\t" /* If invalid: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) "xorl %[ar], %[ar]\n\t" /* set ar = 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) "1:"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) : [ar] "=r" (ar)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) : [old_ss] "rm" ((u16)regs->ss));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * For a valid 64-bit user context, we need DPL 3, type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * read-write data or read-write exp-down data, and S and P
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * set. We can't use VERW because VERW doesn't check the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * P bit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) ar &= AR_DPL_MASK | AR_S | AR_P | AR_TYPE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (ar != (AR_DPL3 | AR_S | AR_P | AR_TYPE_RWDATA) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) ar != (AR_DPL3 | AR_S | AR_P | AR_TYPE_RWDATA_EXPDOWN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) regs->ss = __USER_DS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) # define CONTEXT_COPY_SIZE offsetof(struct sigcontext, reserved1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) # define CONTEXT_COPY_SIZE sizeof(struct sigcontext)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static int restore_sigcontext(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct sigcontext __user *usc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) unsigned long uc_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct sigcontext sc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) /* Always make any pending restarted system calls return -EINTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (copy_from_user(&sc, usc, CONTEXT_COPY_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) #ifdef CONFIG_X86_32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) set_user_gs(regs, sc.gs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) regs->fs = sc.fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) regs->es = sc.es;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) regs->ds = sc.ds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) #endif /* CONFIG_X86_32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) regs->bx = sc.bx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) regs->cx = sc.cx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) regs->dx = sc.dx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) regs->si = sc.si;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) regs->di = sc.di;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) regs->bp = sc.bp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) regs->ax = sc.ax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) regs->sp = sc.sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) regs->ip = sc.ip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) #ifdef CONFIG_X86_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) regs->r8 = sc.r8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) regs->r9 = sc.r9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) regs->r10 = sc.r10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) regs->r11 = sc.r11;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) regs->r12 = sc.r12;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) regs->r13 = sc.r13;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) regs->r14 = sc.r14;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) regs->r15 = sc.r15;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) #endif /* CONFIG_X86_64 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) /* Get CS/SS and force CPL3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) regs->cs = sc.cs | 0x03;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) regs->ss = sc.ss | 0x03;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) regs->flags = (regs->flags & ~FIX_EFLAGS) | (sc.flags & FIX_EFLAGS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /* disable syscall checks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) regs->orig_ax = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) #ifdef CONFIG_X86_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * Fix up SS if needed for the benefit of old DOSEMU and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * CRIU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (unlikely(!(uc_flags & UC_STRICT_RESTORE_SS) && user_64bit_mode(regs)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) force_valid_ss(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return fpu__restore_sig((void __user *)sc.fpstate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) IS_ENABLED(CONFIG_X86_32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static __always_inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) __unsafe_setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) struct pt_regs *regs, unsigned long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) #ifdef CONFIG_X86_32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) unsafe_put_user(get_user_gs(regs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) (unsigned int __user *)&sc->gs, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) unsafe_put_user(regs->fs, (unsigned int __user *)&sc->fs, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) unsafe_put_user(regs->es, (unsigned int __user *)&sc->es, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) unsafe_put_user(regs->ds, (unsigned int __user *)&sc->ds, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) #endif /* CONFIG_X86_32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) unsafe_put_user(regs->di, &sc->di, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) unsafe_put_user(regs->si, &sc->si, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) unsafe_put_user(regs->bp, &sc->bp, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) unsafe_put_user(regs->sp, &sc->sp, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) unsafe_put_user(regs->bx, &sc->bx, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) unsafe_put_user(regs->dx, &sc->dx, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) unsafe_put_user(regs->cx, &sc->cx, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) unsafe_put_user(regs->ax, &sc->ax, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) #ifdef CONFIG_X86_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) unsafe_put_user(regs->r8, &sc->r8, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) unsafe_put_user(regs->r9, &sc->r9, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) unsafe_put_user(regs->r10, &sc->r10, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) unsafe_put_user(regs->r11, &sc->r11, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) unsafe_put_user(regs->r12, &sc->r12, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) unsafe_put_user(regs->r13, &sc->r13, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) unsafe_put_user(regs->r14, &sc->r14, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) unsafe_put_user(regs->r15, &sc->r15, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) #endif /* CONFIG_X86_64 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) unsafe_put_user(current->thread.trap_nr, &sc->trapno, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) unsafe_put_user(current->thread.error_code, &sc->err, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) unsafe_put_user(regs->ip, &sc->ip, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) #ifdef CONFIG_X86_32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) unsafe_put_user(regs->cs, (unsigned int __user *)&sc->cs, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) unsafe_put_user(regs->flags, &sc->flags, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) unsafe_put_user(regs->sp, &sc->sp_at_signal, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) unsafe_put_user(regs->ss, (unsigned int __user *)&sc->ss, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) #else /* !CONFIG_X86_32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) unsafe_put_user(regs->flags, &sc->flags, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) unsafe_put_user(regs->cs, &sc->cs, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) unsafe_put_user(0, &sc->gs, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) unsafe_put_user(0, &sc->fs, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) unsafe_put_user(regs->ss, &sc->ss, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) #endif /* CONFIG_X86_32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) unsafe_put_user(fpstate, (unsigned long __user *)&sc->fpstate, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /* non-iBCS2 extensions.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) unsafe_put_user(mask, &sc->oldmask, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) unsafe_put_user(current->thread.cr2, &sc->cr2, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) Efault:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) #define unsafe_put_sigcontext(sc, fp, regs, set, label) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (__unsafe_setup_sigcontext(sc, fp, regs, set->sig[0])) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) goto label; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) } while(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) #define unsafe_put_sigmask(set, frame, label) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) unsafe_put_user(*(__u64 *)(set), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) (__u64 __user *)&(frame)->uc.uc_sigmask, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) label)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * Set up a signal frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) * Determine which stack to use..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static unsigned long align_sigframe(unsigned long sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) #ifdef CONFIG_X86_32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * Align the stack pointer according to the i386 ABI,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) * i.e. so that on function entry ((sp + 4) & 15) == 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) sp = ((sp + 4) & -16ul) - 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) #else /* !CONFIG_X86_32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) sp = round_down(sp, 16) - 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static void __user *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) void __user **fpstate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) /* Default to using normal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) bool nested_altstack = on_sig_stack(regs->sp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) bool entering_altstack = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) unsigned long math_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) unsigned long sp = regs->sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) unsigned long buf_fx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* redzone */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (IS_ENABLED(CONFIG_X86_64))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) sp -= 128;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) /* This is the X/Open sanctioned signal stack switching. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (ka->sa.sa_flags & SA_ONSTACK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * This checks nested_altstack via sas_ss_flags(). Sensible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * programs use SS_AUTODISARM, which disables that check, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * programs that don't use SS_AUTODISARM get compatible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (sas_ss_flags(sp) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) sp = current->sas_ss_sp + current->sas_ss_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) entering_altstack = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) } else if (IS_ENABLED(CONFIG_X86_32) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) !nested_altstack &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) regs->ss != __USER_DS &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) !(ka->sa.sa_flags & SA_RESTORER) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) ka->sa.sa_restorer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) /* This is the legacy signal stack switching. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) sp = (unsigned long) ka->sa.sa_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) entering_altstack = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) sp = fpu__alloc_mathframe(sp, IS_ENABLED(CONFIG_X86_32),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) &buf_fx, &math_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) *fpstate = (void __user *)sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) sp = align_sigframe(sp - frame_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * If we are on the alternate signal stack and would overflow it, don't.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) * Return an always-bogus address instead so we will die with SIGSEGV.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (unlikely((nested_altstack || entering_altstack) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) !__on_sig_stack(sp))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (show_unhandled_signals && printk_ratelimit())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) pr_info("%s[%d] overflowed sigaltstack\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) current->comm, task_pid_nr(current));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return (void __user *)-1L;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /* save i387 and extended state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) ret = copy_fpstate_to_sigframe(*fpstate, (void __user *)buf_fx, math_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return (void __user *)-1L;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return (void __user *)sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) #ifdef CONFIG_X86_32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) static const struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) u16 poplmovl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) u32 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) u16 int80;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) } __attribute__((packed)) retcode = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 0xb858, /* popl %eax; movl $..., %eax */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) __NR_sigreturn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 0x80cd, /* int $0x80 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) static const struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) u8 movl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) u32 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) u16 int80;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) u8 pad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) } __attribute__((packed)) rt_retcode = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 0xb8, /* movl $..., %eax */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) __NR_rt_sigreturn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 0x80cd, /* int $0x80 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) struct sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) void __user *restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) void __user *fp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (!user_access_begin(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) unsafe_put_user(sig, &frame->sig, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) unsafe_put_sigcontext(&frame->sc, fp, regs, set, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) unsafe_put_user(set->sig[1], &frame->extramask[0], Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (current->mm->context.vdso)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) restorer = current->mm->context.vdso +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) vdso_image_32.sym___kernel_sigreturn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) restorer = &frame->retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (ksig->ka.sa.sa_flags & SA_RESTORER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) restorer = ksig->ka.sa.sa_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) /* Set up to return from userspace. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) unsafe_put_user(restorer, &frame->pretcode, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * WE DO NOT USE IT ANY MORE! It's only left here for historical
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * reasons and because gdb uses it as a signature to notice
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * signal handler stack frames.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) unsafe_put_user(*((u64 *)&retcode), (u64 *)frame->retcode, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) /* Set up registers for signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) regs->sp = (unsigned long)frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) regs->ip = (unsigned long)ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) regs->ax = (unsigned long)sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) regs->dx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) regs->cx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) regs->ds = __USER_DS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) regs->es = __USER_DS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) regs->ss = __USER_DS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) regs->cs = __USER_CS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) Efault:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) static int __setup_rt_frame(int sig, struct ksignal *ksig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) sigset_t *set, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) struct rt_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) void __user *restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) void __user *fp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) if (!user_access_begin(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) unsafe_put_user(sig, &frame->sig, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) unsafe_put_user(&frame->info, &frame->pinfo, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) unsafe_put_user(&frame->uc, &frame->puc, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) /* Create the ucontext. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (static_cpu_has(X86_FEATURE_XSAVE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) unsafe_put_user(UC_FP_XSTATE, &frame->uc.uc_flags, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) unsafe_put_user(0, &frame->uc.uc_flags, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) unsafe_put_user(0, &frame->uc.uc_link, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) unsafe_save_altstack(&frame->uc.uc_stack, regs->sp, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) /* Set up to return from userspace. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) restorer = current->mm->context.vdso +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) vdso_image_32.sym___kernel_rt_sigreturn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (ksig->ka.sa.sa_flags & SA_RESTORER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) restorer = ksig->ka.sa.sa_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) unsafe_put_user(restorer, &frame->pretcode, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) * This is movl $__NR_rt_sigreturn, %ax ; int $0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) * WE DO NOT USE IT ANY MORE! It's only left here for historical
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) * reasons and because gdb uses it as a signature to notice
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) * signal handler stack frames.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) unsafe_put_user(*((u64 *)&rt_retcode), (u64 *)frame->retcode, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) unsafe_put_sigmask(set, frame, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (copy_siginfo_to_user(&frame->info, &ksig->info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) /* Set up registers for signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) regs->sp = (unsigned long)frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) regs->ip = (unsigned long)ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) regs->ax = (unsigned long)sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) regs->dx = (unsigned long)&frame->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) regs->cx = (unsigned long)&frame->uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) regs->ds = __USER_DS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) regs->es = __USER_DS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) regs->ss = __USER_DS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) regs->cs = __USER_CS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) Efault:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) #else /* !CONFIG_X86_32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) static unsigned long frame_uc_flags(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) if (boot_cpu_has(X86_FEATURE_XSAVE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) flags = UC_FP_XSTATE | UC_SIGCONTEXT_SS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) flags = UC_SIGCONTEXT_SS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) if (likely(user_64bit_mode(regs)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) flags |= UC_STRICT_RESTORE_SS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) return flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) static int __setup_rt_frame(int sig, struct ksignal *ksig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) sigset_t *set, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) struct rt_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) void __user *fp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) unsigned long uc_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) /* x86-64 should always use SA_RESTORER. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) if (!(ksig->ka.sa.sa_flags & SA_RESTORER))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) frame = get_sigframe(&ksig->ka, regs, sizeof(struct rt_sigframe), &fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) uc_flags = frame_uc_flags(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) if (!user_access_begin(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) /* Create the ucontext. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) unsafe_put_user(uc_flags, &frame->uc.uc_flags, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) unsafe_put_user(0, &frame->uc.uc_link, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) unsafe_save_altstack(&frame->uc.uc_stack, regs->sp, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /* Set up to return from userspace. If provided, use a stub
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) already in userspace. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) unsafe_put_user(ksig->ka.sa.sa_restorer, &frame->pretcode, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) unsafe_put_sigmask(set, frame, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) if (copy_siginfo_to_user(&frame->info, &ksig->info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) /* Set up registers for signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) regs->di = sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) /* In case the signal handler was declared without prototypes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) regs->ax = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) /* This also works for non SA_SIGINFO handlers because they expect the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) next argument after the signal number on the stack. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) regs->si = (unsigned long)&frame->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) regs->dx = (unsigned long)&frame->uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) regs->sp = (unsigned long)frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) * Set up the CS and SS registers to run signal handlers in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) * 64-bit mode, even if the handler happens to be interrupting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) * 32-bit or 16-bit code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) * SS is subtle. In 64-bit mode, we don't need any particular
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) * SS descriptor, but we do need SS to be valid. It's possible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) * that the old SS is entirely bogus -- this can happen if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) * signal we're trying to deliver is #GP or #SS caused by a bad
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) * SS value. We also have a compatbility issue here: DOSEMU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) * relies on the contents of the SS register indicating the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) * SS value at the time of the signal, even though that code in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) * DOSEMU predates sigreturn's ability to restore SS. (DOSEMU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) * avoids relying on sigreturn to restore SS; instead it uses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) * a trampoline.) So we do our best: if the old SS was valid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * we keep it. Otherwise we replace it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) regs->cs = __USER_CS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) if (unlikely(regs->ss != __USER_DS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) force_valid_ss(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) Efault:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) #endif /* CONFIG_X86_32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) #ifdef CONFIG_X86_X32_ABI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) static int x32_copy_siginfo_to_user(struct compat_siginfo __user *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) const struct kernel_siginfo *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) struct compat_siginfo new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) copy_siginfo_to_external32(&new, from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) if (from->si_signo == SIGCHLD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) new._sifields._sigchld_x32._utime = from->si_utime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) new._sifields._sigchld_x32._stime = from->si_stime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) if (copy_to_user(to, &new, sizeof(struct compat_siginfo)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) int copy_siginfo_to_user32(struct compat_siginfo __user *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) const struct kernel_siginfo *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) if (in_x32_syscall())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) return x32_copy_siginfo_to_user(to, from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) return __copy_siginfo_to_user32(to, from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) #endif /* CONFIG_X86_X32_ABI */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) static int x32_setup_rt_frame(struct ksignal *ksig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) compat_sigset_t *set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) #ifdef CONFIG_X86_X32_ABI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) struct rt_sigframe_x32 __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) unsigned long uc_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) void __user *restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) void __user *fp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) if (!(ksig->ka.sa.sa_flags & SA_RESTORER))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) uc_flags = frame_uc_flags(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) if (!user_access_begin(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) /* Create the ucontext. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) unsafe_put_user(uc_flags, &frame->uc.uc_flags, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) unsafe_put_user(0, &frame->uc.uc_link, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) unsafe_compat_save_altstack(&frame->uc.uc_stack, regs->sp, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) unsafe_put_user(0, &frame->uc.uc__pad0, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) restorer = ksig->ka.sa.sa_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) unsafe_put_user(restorer, (unsigned long __user *)&frame->pretcode, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) unsafe_put_sigmask(set, frame, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) if (x32_copy_siginfo_to_user(&frame->info, &ksig->info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) /* Set up registers for signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) regs->sp = (unsigned long) frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) /* We use the x32 calling convention here... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) regs->di = ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) regs->si = (unsigned long) &frame->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) regs->dx = (unsigned long) &frame->uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) loadsegment(ds, __USER_DS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) loadsegment(es, __USER_DS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) regs->cs = __USER_CS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) regs->ss = __USER_DS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) #endif /* CONFIG_X86_X32_ABI */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) #ifdef CONFIG_X86_X32_ABI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) Efault:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) * Do a signal return; undo the signal stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) #ifdef CONFIG_X86_32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) SYSCALL_DEFINE0(sigreturn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) struct sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) frame = (struct sigframe __user *)(regs->sp - 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) if (__get_user(set.sig[0], &frame->sc.oldmask) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) __get_user(set.sig[1], &frame->extramask[0]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) * x86_32 has no uc_flags bits relevant to restore_sigcontext.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) * Save a few cycles by skipping the __get_user.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) if (restore_sigcontext(regs, &frame->sc, 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) return regs->ax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) signal_fault(regs, frame, "sigreturn");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) #endif /* CONFIG_X86_32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) SYSCALL_DEFINE0(rt_sigreturn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) struct rt_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) unsigned long uc_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) if (__get_user(*(__u64 *)&set, (__u64 __user *)&frame->uc.uc_sigmask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) if (__get_user(uc_flags, &frame->uc.uc_flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) if (restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) if (restore_altstack(&frame->uc.uc_stack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) return regs->ax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) signal_fault(regs, frame, "rt_sigreturn");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) static inline int is_ia32_compat_frame(struct ksignal *ksig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) return IS_ENABLED(CONFIG_IA32_EMULATION) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) ksig->ka.sa.sa_flags & SA_IA32_ABI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) static inline int is_ia32_frame(struct ksignal *ksig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) return IS_ENABLED(CONFIG_X86_32) || is_ia32_compat_frame(ksig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) static inline int is_x32_frame(struct ksignal *ksig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) return IS_ENABLED(CONFIG_X86_X32_ABI) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) ksig->ka.sa.sa_flags & SA_X32_ABI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) int usig = ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) sigset_t *set = sigmask_to_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) compat_sigset_t *cset = (compat_sigset_t *) set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) /* Perform fixup for the pre-signal frame. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) rseq_signal_deliver(ksig, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) /* Set up the stack frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) if (is_ia32_frame(ksig)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) if (ksig->ka.sa.sa_flags & SA_SIGINFO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) return ia32_setup_rt_frame(usig, ksig, cset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) return ia32_setup_frame(usig, ksig, cset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) } else if (is_x32_frame(ksig)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) return x32_setup_rt_frame(ksig, cset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) return __setup_rt_frame(ksig->sig, ksig, set, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) handle_signal(struct ksignal *ksig, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) bool stepping, failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) struct fpu *fpu = ¤t->thread.fpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) if (v8086_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) save_v86_state((struct kernel_vm86_regs *) regs, VM86_SIGNAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) /* Are we from a system call? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) if (syscall_get_nr(current, regs) >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) /* If so, check system call restarting.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) switch (syscall_get_error(current, regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) regs->ax = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) regs->ax = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) regs->ax = regs->orig_ax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) regs->ip -= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) * If TF is set due to a debugger (TIF_FORCED_TF), clear TF now
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) * so that register information in the sigcontext is correct and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) * then notify the tracer before entering the signal handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) stepping = test_thread_flag(TIF_SINGLESTEP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) if (stepping)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) user_disable_single_step(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) failed = (setup_rt_frame(ksig, regs) < 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) if (!failed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) * Clear the direction flag as per the ABI for function entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) * Clear RF when entering the signal handler, because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) * it might disable possible debug exception from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) * signal handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) * Clear TF for the case when it wasn't set by debugger to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) * avoid the recursive send_sigtrap() in SIGTRAP handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) regs->flags &= ~(X86_EFLAGS_DF|X86_EFLAGS_RF|X86_EFLAGS_TF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) * Ensure the signal handler starts with the new fpu state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) fpu__clear_user_states(fpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) signal_setup_done(failed, ksig, stepping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) static inline unsigned long get_nr_restart_syscall(const struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) #ifdef CONFIG_IA32_EMULATION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) if (current_thread_info()->status & TS_COMPAT_RESTART)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) return __NR_ia32_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) #ifdef CONFIG_X86_X32_ABI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) return __NR_restart_syscall | (regs->orig_ax & __X32_SYSCALL_BIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) return __NR_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) * Note that 'init' is a special process: it doesn't get signals it doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) * want to handle. Thus you cannot kill init even with a SIGKILL even by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) * mistake.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) void arch_do_signal(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) struct ksignal ksig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) if (get_signal(&ksig)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) /* Whee! Actually deliver the signal. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) handle_signal(&ksig, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) /* Did we come from a system call? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) if (syscall_get_nr(current, regs) >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) /* Restart the system call - no handlers present */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) switch (syscall_get_error(current, regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) regs->ax = regs->orig_ax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) regs->ip -= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) regs->ax = get_nr_restart_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) regs->ip -= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) * If there's no signal to deliver, we just put the saved sigmask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) * back.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) restore_saved_sigmask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) struct task_struct *me = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) if (show_unhandled_signals && printk_ratelimit()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) printk("%s"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) me->comm, me->pid, where, frame,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) regs->ip, regs->sp, regs->orig_ax);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) print_vma_addr(KERN_CONT " in ", regs->ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) pr_cont("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) #ifdef CONFIG_X86_X32_ABI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) COMPAT_SYSCALL_DEFINE0(x32_rt_sigreturn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) struct rt_sigframe_x32 __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) unsigned long uc_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) if (__get_user(set.sig[0], (__u64 __user *)&frame->uc.uc_sigmask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) if (__get_user(uc_flags, &frame->uc.uc_flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) if (restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) if (compat_restore_altstack(&frame->uc.uc_stack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) return regs->ax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) signal_fault(regs, frame, "x32 rt_sigreturn");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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