Messages in this thread | | | From | Andrey Konovalov <> | Date | Fri, 5 Mar 2021 16:43:11 +0100 | Subject | Re: [PATCH] kasan, mm: fix crash with HW_TAGS and DEBUG_PAGEALLOC |
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On Thu, Mar 4, 2021 at 12:23 AM Andrew Morton <akpm@linux-foundation.org> wrote: > > On Fri, 26 Feb 2021 02:25:37 +0100 Andrey Konovalov <andreyknvl@google.com> wrote: > > > Currently, kasan_free_nondeferred_pages()->kasan_free_pages() is called > > after debug_pagealloc_unmap_pages(). This causes a crash when > > debug_pagealloc is enabled, as HW_TAGS KASAN can't set tags on an > > unmapped page. > > > > This patch puts kasan_free_nondeferred_pages() before > > debug_pagealloc_unmap_pages(). > > > > Besides fixing the crash, this also makes the annotation order consistent > > with debug_pagealloc_map_pages() preceding kasan_alloc_pages(). > > > > This bug exists in 5.12, does it not? > > If so, is cc:stable appropriate and if so, do we have a suitable Fixes: > commit?
Sure:
Fixes: 94ab5b61ee16 ("kasan, arm64: enable CONFIG_KASAN_HW_TAGS") Cc: <stable@vger.kernel.org>
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