From 1e0f611fab9c5743719a95e09a2846e4052fd644 Mon Sep 17 00:00:00 2001 From: Andrey Konovalov Date: Thu, 24 Mar 2022 18:12:25 -0700 Subject: [PATCH] kasan: print basic stack frame info for SW_TAGS Software Tag-Based mode tags stack allocations when CONFIG_KASAN_STACK is enabled. Print task name and id in reports for stack-related bugs. [andreyknvl@google.com: include linux/sched/task_stack.h] Link: https://lkml.kernel.org/r/d7598f11a34ed96e508f7640fa038662ed2305ec.1647099922.git.andreyknvl@google.com Link: https://lkml.kernel.org/r/029aaa87ceadde0702f3312a34697c9139c9fb53.1646237226.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov Reviewed-by: Alexander Potapenko Cc: Andrey Ryabinin Cc: Dmitry Vyukov Cc: Marco Elver Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/kasan/kasan.h | 2 +- mm/kasan/report_sw_tags.c | 12 ++++++++++++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index d1e111b7d5d8..4447df0d7343 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -274,7 +274,7 @@ void *kasan_find_first_bad_addr(void *addr, size_t size); const char *kasan_get_bug_type(struct kasan_access_info *info); void kasan_metadata_fetch_row(char *buffer, void *row); -#if defined(CONFIG_KASAN_GENERIC) && defined(CONFIG_KASAN_STACK) +#if defined(CONFIG_KASAN_STACK) void kasan_print_address_stack_frame(const void *addr); #else static inline void kasan_print_address_stack_frame(const void *addr) { } diff --git a/mm/kasan/report_sw_tags.c b/mm/kasan/report_sw_tags.c index d2298c357834..7271f0988fc0 100644 --- a/mm/kasan/report_sw_tags.c +++ b/mm/kasan/report_sw_tags.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -51,3 +52,14 @@ void kasan_print_tags(u8 addr_tag, const void *addr) pr_err("Pointer tag: [%02x], memory tag: [%02x]\n", addr_tag, *shadow); } + +#ifdef CONFIG_KASAN_STACK +void kasan_print_address_stack_frame(const void *addr) +{ + if (WARN_ON(!object_is_on_stack(addr))) + return; + + pr_err("The buggy address belongs to stack of task %s/%d\n", + current->comm, task_pid_nr(current)); +} +#endif -- 2.34.1