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| author | Andrey Konovalov <andreyknvl@google.com> | 2022-09-06 00:05:46 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-04 00:03:01 +0300 |
| commit | 7ebfce33125100e3f0c5e059845a019a1401433d (patch) | |
| tree | b02449fd4156bd3e43c1e12dd407a096b21b0816 /mm/kasan/tags.c | |
| parent | 7bc0584e5d2a687c0855a1b3dec9a6d6857d757b (diff) | |
| download | linux-7ebfce33125100e3f0c5e059845a019a1401433d.tar.xz | |
kasan: support kasan.stacktrace for SW_TAGS
Add support for the kasan.stacktrace command-line argument for Software
Tag-Based KASAN.
The following patch adds a command-line argument for selecting the stack
ring size, and, as the stack ring is supported by both the Software and
the Hardware Tag-Based KASAN modes, it is natural that both of them have
support for kasan.stacktrace too.
Link: https://lkml.kernel.org/r/3b43059103faa7f8796017847b7d674b658f11b5.1662411799.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Peter Collingbourne <pcc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kasan/tags.c')
| -rw-r--r-- | mm/kasan/tags.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/mm/kasan/tags.c b/mm/kasan/tags.c index a0524e037f49..dd929ab166fb 100644 --- a/mm/kasan/tags.c +++ b/mm/kasan/tags.c @@ -19,6 +19,17 @@ #include "kasan.h" #include "../slab.h" +enum kasan_arg_stacktrace { + KASAN_ARG_STACKTRACE_DEFAULT, + KASAN_ARG_STACKTRACE_OFF, + KASAN_ARG_STACKTRACE_ON, +}; + +static enum kasan_arg_stacktrace kasan_arg_stacktrace __initdata; + +/* Whether to collect alloc/free stack traces. */ +DEFINE_STATIC_KEY_TRUE(kasan_flag_stacktrace); + /* Non-zero, as initial pointer values are 0. */ #define STACK_RING_BUSY_PTR ((void *)1) @@ -26,6 +37,38 @@ struct kasan_stack_ring stack_ring = { .lock = __RW_LOCK_UNLOCKED(stack_ring.lock) }; +/* kasan.stacktrace=off/on */ +static int __init early_kasan_flag_stacktrace(char *arg) +{ + if (!arg) + return -EINVAL; + + if (!strcmp(arg, "off")) + kasan_arg_stacktrace = KASAN_ARG_STACKTRACE_OFF; + else if (!strcmp(arg, "on")) + kasan_arg_stacktrace = KASAN_ARG_STACKTRACE_ON; + else + return -EINVAL; + + return 0; +} +early_param("kasan.stacktrace", early_kasan_flag_stacktrace); + +void __init kasan_init_tags(void) +{ + switch (kasan_arg_stacktrace) { + case KASAN_ARG_STACKTRACE_DEFAULT: + /* Default is specified by kasan_flag_stacktrace definition. */ + break; + case KASAN_ARG_STACKTRACE_OFF: + static_branch_disable(&kasan_flag_stacktrace); + break; + case KASAN_ARG_STACKTRACE_ON: + static_branch_enable(&kasan_flag_stacktrace); + break; + } +} + static void save_stack_info(struct kmem_cache *cache, void *object, gfp_t gfp_flags, bool is_free) { |