Orange Pi5 kernel

^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) #define pr_fmt(fmt) "kcsan: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/bsearch.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/bug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/kallsyms.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sort.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include "kcsan.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) atomic_long_t kcsan_counters[KCSAN_COUNTER_COUNT];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) static const char *const counter_names[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	[KCSAN_COUNTER_USED_WATCHPOINTS]		= "used_watchpoints",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	[KCSAN_COUNTER_SETUP_WATCHPOINTS]		= "setup_watchpoints",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	[KCSAN_COUNTER_DATA_RACES]			= "data_races",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	[KCSAN_COUNTER_ASSERT_FAILURES]			= "assert_failures",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	[KCSAN_COUNTER_NO_CAPACITY]			= "no_capacity",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	[KCSAN_COUNTER_REPORT_RACES]			= "report_races",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	[KCSAN_COUNTER_RACES_UNKNOWN_ORIGIN]		= "races_unknown_origin",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	[KCSAN_COUNTER_UNENCODABLE_ACCESSES]		= "unencodable_accesses",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	[KCSAN_COUNTER_ENCODING_FALSE_POSITIVES]	= "encoding_false_positives",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static_assert(ARRAY_SIZE(counter_names) == KCSAN_COUNTER_COUNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * Addresses for filtering functions from reporting. This list can be used as a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * whitelist or blacklist.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	unsigned long	*addrs;		/* array of addresses */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	size_t		size;		/* current size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	int		used;		/* number of elements used */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	bool		sorted;		/* if elements are sorted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	bool		whitelist;	/* if list is a blacklist or whitelist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) } report_filterlist = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	.addrs		= NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	.size		= 8,		/* small initial size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	.used		= 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	.sorted		= false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	.whitelist	= false,	/* default is blacklist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) static DEFINE_SPINLOCK(report_filterlist_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  * The microbenchmark allows benchmarking KCSAN core runtime only. To run
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  * multiple threads, pipe 'microbench=<iters>' from multiple tasks into the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  * debugfs file. This will not generate any conflicts, and tests fast-path only.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static noinline void microbenchmark(unsigned long iters)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	const struct kcsan_ctx ctx_save = current->kcsan_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	const bool was_enabled = READ_ONCE(kcsan_enabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	cycles_t cycles;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	/* We may have been called from an atomic region; reset context. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	memset(&current->kcsan_ctx, 0, sizeof(current->kcsan_ctx));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	 * Disable to benchmark fast-path for all accesses, and (expected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	 * negligible) call into slow-path, but never set up watchpoints.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	WRITE_ONCE(kcsan_enabled, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	pr_info("%s begin | iters: %lu\n", __func__, iters);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	cycles = get_cycles();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	while (iters--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		unsigned long addr = iters & ((PAGE_SIZE << 8) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		int type = !(iters & 0x7f) ? KCSAN_ACCESS_ATOMIC :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 				(!(iters & 0xf) ? KCSAN_ACCESS_WRITE : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		__kcsan_check_access((void *)addr, sizeof(long), type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	cycles = get_cycles() - cycles;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	pr_info("%s end   | cycles: %llu\n", __func__, cycles);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	WRITE_ONCE(kcsan_enabled, was_enabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	/* restore context */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	current->kcsan_ctx = ctx_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) static int cmp_filterlist_addrs(const void *rhs, const void *lhs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	const unsigned long a = *(const unsigned long *)rhs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	const unsigned long b = *(const unsigned long *)lhs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	return a < b ? -1 : a == b ? 0 : 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) bool kcsan_skip_report_debugfs(unsigned long func_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	unsigned long symbolsize, offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	bool ret = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	if (!kallsyms_lookup_size_offset(func_addr, &symbolsize, &offset))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	func_addr -= offset; /* Get function start */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	spin_lock_irqsave(&report_filterlist_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	if (report_filterlist.used == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	/* Sort array if it is unsorted, and then do a binary search. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (!report_filterlist.sorted) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		sort(report_filterlist.addrs, report_filterlist.used,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		     sizeof(unsigned long), cmp_filterlist_addrs, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		report_filterlist.sorted = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	ret = !!bsearch(&func_addr, report_filterlist.addrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			report_filterlist.used, sizeof(unsigned long),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			cmp_filterlist_addrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (report_filterlist.whitelist)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		ret = !ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	spin_unlock_irqrestore(&report_filterlist_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static void set_report_filterlist_whitelist(bool whitelist)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	spin_lock_irqsave(&report_filterlist_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	report_filterlist.whitelist = whitelist;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	spin_unlock_irqrestore(&report_filterlist_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /* Returns 0 on success, error-code otherwise. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static ssize_t insert_report_filterlist(const char *func)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	unsigned long addr = kallsyms_lookup_name(func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	ssize_t ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (!addr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		pr_err("could not find function: '%s'\n", func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	spin_lock_irqsave(&report_filterlist_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (report_filterlist.addrs == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		/* initial allocation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		report_filterlist.addrs =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			kmalloc_array(report_filterlist.size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 				      sizeof(unsigned long), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		if (report_filterlist.addrs == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	} else if (report_filterlist.used == report_filterlist.size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		/* resize filterlist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		size_t new_size = report_filterlist.size * 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		unsigned long *new_addrs =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			krealloc(report_filterlist.addrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 				 new_size * sizeof(unsigned long), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		if (new_addrs == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			/* leave filterlist itself untouched */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		report_filterlist.size = new_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		report_filterlist.addrs = new_addrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	/* Note: deduplicating should be done in userspace. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	report_filterlist.addrs[report_filterlist.used++] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		kallsyms_lookup_name(func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	report_filterlist.sorted = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	spin_unlock_irqrestore(&report_filterlist_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) static int show_info(struct seq_file *file, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	/* show stats */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	seq_printf(file, "enabled: %i\n", READ_ONCE(kcsan_enabled));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	for (i = 0; i < KCSAN_COUNTER_COUNT; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		seq_printf(file, "%s: %ld\n", counter_names[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			   atomic_long_read(&kcsan_counters[i]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	/* show filter functions, and filter type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	spin_lock_irqsave(&report_filterlist_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	seq_printf(file, "\n%s functions: %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		   report_filterlist.whitelist ? "whitelisted" : "blacklisted",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		   report_filterlist.used == 0 ? "none" : "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	for (i = 0; i < report_filterlist.used; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		seq_printf(file, " %ps\n", (void *)report_filterlist.addrs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	spin_unlock_irqrestore(&report_filterlist_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static int debugfs_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	return single_open(file, show_info, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) debugfs_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	char kbuf[KSYM_NAME_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	char *arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	int read_len = count < (sizeof(kbuf) - 1) ? count : (sizeof(kbuf) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (copy_from_user(kbuf, buf, read_len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	kbuf[read_len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	arg = strstrip(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (!strcmp(arg, "on")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		WRITE_ONCE(kcsan_enabled, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	} else if (!strcmp(arg, "off")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		WRITE_ONCE(kcsan_enabled, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	} else if (str_has_prefix(arg, "microbench=")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		unsigned long iters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		if (kstrtoul(&arg[strlen("microbench=")], 0, &iters))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		microbenchmark(iters);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	} else if (!strcmp(arg, "whitelist")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		set_report_filterlist_whitelist(true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	} else if (!strcmp(arg, "blacklist")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		set_report_filterlist_whitelist(false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	} else if (arg[0] == '!') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		ssize_t ret = insert_report_filterlist(&arg[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) static const struct file_operations debugfs_ops =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	.read	 = seq_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	.open	 = debugfs_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	.write	 = debugfs_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	.release = single_release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static int __init kcsan_debugfs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	debugfs_create_file("kcsan", 0644, NULL, NULL, &debugfs_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) late_initcall(kcsan_debugfs_init);