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UPSTREAM: kasan: print basic stack frame info for SW_TAGS

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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 <andreyknvl@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Bug: 254721825
(cherry picked from commit 1e0f611fab)
Change-Id: Ia980ef1b86fd0e00760f999a90e56478f154f85a
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
This commit is contained in:
Andrey Konovalov
2022-03-24 18:12:25 -07:00
committed by Todd Kjos
parent 25483dc0e6
commit 0c6f95df28
2 changed files with 13 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
mm/kasan/kasan.h
View File

@@ -270,7 +270,7 @@ 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) { }

12
mm/kasan/report_sw_tags.c
View File

@@ -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 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