^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/kernel/compat.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Kernel compatibililty routines for e.g. 32 bit syscall support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * on 64 bit kernels.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
^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) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/migrate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/posix-timers.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/times.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #ifdef __ARCH_WANT_SYS_SIGPROCMASK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * blocked set of signals to the supplied signal set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) memcpy(blocked->sig, &set, sizeof(set));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) compat_old_sigset_t __user *, nset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) compat_old_sigset_t __user *, oset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) old_sigset_t old_set, new_set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) sigset_t new_blocked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) old_set = current->blocked.sig[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (nset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (get_user(new_set, nset))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) new_blocked = current->blocked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) switch (how) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) case SIG_BLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) sigaddsetmask(&new_blocked, new_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) case SIG_UNBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) sigdelsetmask(&new_blocked, new_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) case SIG_SETMASK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) compat_sig_setmask(&new_blocked, new_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) set_current_blocked(&new_blocked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (oset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (put_user(old_set, oset))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct compat_rusage r32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) memset(&r32, 0, sizeof(r32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) r32.ru_utime.tv_sec = r->ru_utime.tv_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) r32.ru_utime.tv_usec = r->ru_utime.tv_usec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) r32.ru_stime.tv_sec = r->ru_stime.tv_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) r32.ru_stime.tv_usec = r->ru_stime.tv_usec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) r32.ru_maxrss = r->ru_maxrss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) r32.ru_ixrss = r->ru_ixrss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) r32.ru_idrss = r->ru_idrss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) r32.ru_isrss = r->ru_isrss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) r32.ru_minflt = r->ru_minflt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) r32.ru_majflt = r->ru_majflt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) r32.ru_nswap = r->ru_nswap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) r32.ru_inblock = r->ru_inblock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) r32.ru_oublock = r->ru_oublock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) r32.ru_msgsnd = r->ru_msgsnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) r32.ru_msgrcv = r->ru_msgrcv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) r32.ru_nsignals = r->ru_nsignals;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) r32.ru_nvcsw = r->ru_nvcsw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) r32.ru_nivcsw = r->ru_nivcsw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (copy_to_user(ru, &r32, sizeof(r32)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) unsigned len, struct cpumask *new_mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) unsigned long *k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (len < cpumask_size())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) memset(new_mask, 0, cpumask_size());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) else if (len > cpumask_size())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) len = cpumask_size();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) k = cpumask_bits(new_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return compat_get_bitmap(k, user_mask_ptr, len * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) unsigned int, len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) compat_ulong_t __user *, user_mask_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) cpumask_var_t new_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) retval = sched_setaffinity(pid, new_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) free_cpumask_var(new_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) compat_ulong_t __user *, user_mask_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) cpumask_var_t mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if ((len * BITS_PER_BYTE) < nr_cpu_ids)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (len & (sizeof(compat_ulong_t)-1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (!alloc_cpumask_var(&mask, GFP_KERNEL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) ret = sched_getaffinity(pid, mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (ret == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) unsigned int retlen = min(len, cpumask_size());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) ret = retlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) free_cpumask_var(mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * We currently only need the following fields from the sigevent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * structure: sigev_value, sigev_signo, sig_notify and (sometimes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * sigev_notify_thread_id). The others are handled in user mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * We also assume that copying sigev_value.sival_int is sufficient
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * to keep all the bits of sigev_value.sival_ptr intact.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) int get_compat_sigevent(struct sigevent *event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) const struct compat_sigevent __user *u_event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) memset(event, 0, sizeof(*event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return (!access_ok(u_event, sizeof(*u_event)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) __get_user(event->sigev_value.sival_int,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) &u_event->sigev_value.sival_int) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) __get_user(event->sigev_signo, &u_event->sigev_signo) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) __get_user(event->sigev_notify, &u_event->sigev_notify) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) __get_user(event->sigev_notify_thread_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) &u_event->sigev_notify_thread_id))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) unsigned long bitmap_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) unsigned long nr_compat_longs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) /* align bitmap up to nearest compat_long_t boundary */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (!user_read_access_begin(umask, bitmap_size / 8))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) while (nr_compat_longs > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) compat_ulong_t l1, l2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) unsafe_get_user(l1, umask++, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) unsafe_get_user(l2, umask++, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) *mask++ = ((unsigned long)l2 << BITS_PER_COMPAT_LONG) | l1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) nr_compat_longs -= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) if (nr_compat_longs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) unsafe_get_user(*mask, umask++, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) user_read_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) Efault:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) user_read_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) unsigned long bitmap_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) unsigned long nr_compat_longs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /* align bitmap up to nearest compat_long_t boundary */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (!user_write_access_begin(umask, bitmap_size / 8))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) while (nr_compat_longs > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) unsigned long m = *mask++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) unsafe_put_user((compat_ulong_t)m, umask++, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) unsafe_put_user(m >> BITS_PER_COMPAT_LONG, umask++, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) nr_compat_longs -= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if (nr_compat_longs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) unsafe_put_user((compat_ulong_t)*mask, umask++, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) user_write_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) Efault:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) user_write_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) #ifdef __BIG_ENDIAN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) compat_sigset_t v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (copy_from_user(&v, compat, sizeof(compat_sigset_t)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) switch (_NSIG_WORDS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) case 4: set->sig[3] = v.sig[6] | (((long)v.sig[7]) << 32 );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) case 3: set->sig[2] = v.sig[4] | (((long)v.sig[5]) << 32 );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) case 2: set->sig[1] = v.sig[2] | (((long)v.sig[3]) << 32 );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) case 1: set->sig[0] = v.sig[0] | (((long)v.sig[1]) << 32 );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) if (copy_from_user(set, compat, sizeof(compat_sigset_t)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) EXPORT_SYMBOL_GPL(get_compat_sigset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * Allocate user-space memory for the duration of a single system call,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) * in order to marshall parameters inside a compat thunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) void __user *compat_alloc_user_space(unsigned long len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) void __user *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) /* If len would occupy more than half of the entire compat space... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) ptr = arch_compat_alloc_user_space(len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (unlikely(!access_ok(ptr, len)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) return ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) EXPORT_SYMBOL_GPL(compat_alloc_user_space);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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