From: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Subject: 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@xxxxxxxxxx: include linux/sched/task_stack.h] Link: https://lkml.kernel.org/r/d7598f11a34ed96e508f7640fa038662ed2305ec.1647099922.git.andreyknvl@xxxxxxxxxx Link: https://lkml.kernel.org/r/029aaa87ceadde0702f3312a34697c9139c9fb53.1646237226.git.andreyknvl@xxxxxxxxxx Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Marco Elver <elver@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/kasan/kasan.h | 2 +- mm/kasan/report_sw_tags.c | 12 ++++++++++++ 2 files changed, 13 insertions(+), 1 deletion(-) --- a/mm/kasan/kasan.h~kasan-print-basic-stack-frame-info-for-sw_tags +++ a/mm/kasan/kasan.h @@ -274,7 +274,7 @@ void *kasan_find_first_bad_addr(void *ad 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) { } --- a/mm/kasan/report_sw_tags.c~kasan-print-basic-stack-frame-info-for-sw_tags +++ a/mm/kasan/report_sw_tags.c @@ -16,6 +16,7 @@ #include <linux/mm.h> #include <linux/printk.h> #include <linux/sched.h> +#include <linux/sched/task_stack.h> #include <linux/slab.h> #include <linux/stackdepot.h> #include <linux/stacktrace.h> @@ -51,3 +52,14 @@ void kasan_print_tags(u8 addr_tag, const 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 _
