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linux/mm/kasan
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Yeoreum Yun 2d89dab1ea kasan: remove kasan_find_vm_area() to prevent possible deadlock 
commit 6ee9b3d847 upstream.

find_vm_area() couldn't be called in atomic_context.  If find_vm_area() is
called to reports vm area information, kasan can trigger deadlock like:

CPU0                                CPU1
vmalloc();
 alloc_vmap_area();
  spin_lock(&vn->busy.lock)
                                    spin_lock_bh(&some_lock);
   <interrupt occurs>
   <in softirq>
   spin_lock(&some_lock);
                                    <access invalid address>
                                    kasan_report();
                                     print_report();
                                      print_address_description();
                                       kasan_find_vm_area();
                                        find_vm_area();
                                         spin_lock(&vn->busy.lock) // deadlock!

To prevent possible deadlock while kasan reports, remove kasan_find_vm_area().

Link: https://lkml.kernel.org/r/20250703181018.580833-1-yeoreum.yun@arm.com
Fixes: c056a364e9 ("kasan: print virtual mapping info in reports")
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reported-by: Yunseong Kim <ysk@kzalloc.com>
Reviewed-by: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-07-17 18:37:23 +02:00
..
common.c slub: Introduce CONFIG_SLUB_RCU_DEBUG 2024-08-27 14:12:51 +02:00
generic.c slab changes for 6.9 2024-03-12 20:14:54 -07:00
hw_tags.c fix missing vmalloc.h includes 2024-04-25 20:55:49 -07:00
init.c LoongArch: Set initial pte entry with PAGE_GLOBAL for kernel space 2024-10-21 22:11:19 +08:00
kasan.h kasan: rust: Add KASAN smoke test via UAF 2024-09-16 18:04:37 +02:00
kasan_test_c.c kasan: remove vmalloc_percpu test 2024-10-30 20:14:11 -07:00
kasan_test_module.c kasan: rename test_kasan_module_init to kasan_test_module_init 2024-02-22 10:24:53 -08:00
kasan_test_rust.rs rust: treewide: switch to the kernel Vec type 2025-03-13 13:01:46 +01:00
Makefile kasan: rust: Add KASAN smoke test via UAF 2024-09-16 18:04:37 +02:00
quarantine.c kasan: revert eviction of stack traces in generic mode 2024-02-23 17:27:12 -08:00
report.c kasan: remove kasan_find_vm_area() to prevent possible deadlock 2025-07-17 18:37:23 +02:00
report_generic.c kasan: stop leaking stack trace handles 2024-01-05 10:17:45 -08:00
report_hw_tags.c kasan: use internal prototypes matching gcc-13 builtins 2023-06-09 16:25:19 -07:00
report_sw_tags.c kasan: use internal prototypes matching gcc-13 builtins 2023-06-09 16:25:19 -07:00
report_tags.c kasan: simplify kasan_complete_mode_report_info for tag-based modes 2023-12-29 11:58:47 -08:00
shadow.c mm/vmalloc: combine all TLB flush operations of KASAN shadow virtual address into one operation 2024-12-09 10:41:08 +01:00
sw_tags.c kasan: use internal prototypes matching gcc-13 builtins 2023-06-09 16:25:19 -07:00
tags.c kasan: simplify saving extra info into tracks 2023-12-29 11:58:46 -08:00