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authorMarco Elver <elver@google.com>2022-01-21 22:14:31 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-22 08:33:38 +0200
commite940066089490efde86abc519593be84362f4e53 (patch)
treeffd6a2977d1065ee08ec5fe54123afc455e1e841 /mm
parent2dba5eb1c73b6ba2988ced07250edeac0f8cbf5a (diff)
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lib/stackdepot: always do filter_irq_stacks() in stack_depot_save()
The non-interrupt portion of interrupt stack traces before interrupt entry is usually arbitrary. Therefore, saving stack traces of interrupts (that include entries before interrupt entry) to stack depot leads to unbounded stackdepot growth. As such, use of filter_irq_stacks() is a requirement to ensure stackdepot can efficiently deduplicate interrupt stacks. Looking through all current users of stack_depot_save(), none (except KASAN) pass the stack trace through filter_irq_stacks() before passing it on to stack_depot_save(). Rather than adding filter_irq_stacks() to all current users of stack_depot_save(), it became clear that stack_depot_save() should simply do filter_irq_stacks(). Link: https://lkml.kernel.org/r/20211130095727.2378739-1-elver@google.com Signed-off-by: Marco Elver <elver@google.com> Reviewed-by: Alexander Potapenko <glider@google.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Vijayanand Jitta <vjitta@codeaurora.org> Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org> Cc: Imran Khan <imran.f.khan@oracle.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Jani Nikula <jani.nikula@intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/kasan/common.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 7c06db78a76c..92196562687b 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -36,7 +36,6 @@ depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc)
unsigned int nr_entries;
nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
- nr_entries = filter_irq_stacks(entries, nr_entries);
return __stack_depot_save(entries, nr_entries, flags, can_alloc);
}