Sorry to make noise. I've missed in-reply-to.
I'll send again.
Thanks
-- Sincerely, Yeoreum Yun
________________________________________ From: Yeoreum Yun yeoreum.yun@arm.com Sent: 14 July 2025 07:44 To: ppbuk5246@gmail.com Cc: Yeo Reum Yun; Yunseong Kim; Andrey Ryabinin; Alexander Potapenko; Andrey Konovalov; Byungchul Park; Dmitriy Vyukov; Sebastian Andrzej Siewior; Steven Rostedt; Vincenzo Frascino; stable@vger.kernel.org; Andrew Morton Subject: [PATCH 6.12.y 1/1] kasan: remove kasan_find_vm_area() to prevent possible deadlock
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: c056a364e954 ("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 (cherry picked from commit 6ee9b3d84775944fb8c8a447961cd01274ac671c) --- mm/kasan/report.c | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-)
diff --git a/mm/kasan/report.c b/mm/kasan/report.c index c7c0083203cb..5675d6a412ef 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -398,17 +398,8 @@ static void print_address_description(void *addr, u8 tag, }
if (is_vmalloc_addr(addr)) { - struct vm_struct *va = find_vm_area(addr); - - if (va) { - pr_err("The buggy address belongs to the virtual mapping at\n" - " [%px, %px) created by:\n" - " %pS\n", - va->addr, va->addr + va->size, va->caller); - pr_err("\n"); - - page = vmalloc_to_page(addr); - } + pr_err("The buggy address %px belongs to a vmalloc virtual mapping\n", addr); + page = vmalloc_to_page(addr); }
if (page) { -- LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}
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