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| author |  luofei <luofei@unicloud.com>
| 2022-03-22 14:44:38 -0700 |
|---|---|---|
| committer |  Linus Torvalds <torvalds@linux-foundation.org>
| 2022-03-22 15:57:07 -0700 |
| commit | d1fe111fb62a1cf0446a2919f5effbb33ad0702c (patch) | |
| tree | 6574928df84f4ec14b01945db7c003748bf092a0 /mm/madvise.c | |
| parent | mm/hwpoison-inject: support injecting hwpoison to free page (diff) | |
| download | linux-d1fe111fb62a1cf0446a2919f5effbb33ad0702c.tar.gz linux-d1fe111fb62a1cf0446a2919f5effbb33ad0702c.tar.bz2 linux-d1fe111fb62a1cf0446a2919f5effbb33ad0702c.zip | |
mm/hwpoison: avoid the impact of hwpoison_filter() return value on mce handler
When the hwpoison page meets the filter conditions, it should not be
regarded as successful memory_failure() processing for mce handler, but
should return a distinct value, otherwise mce handler regards the error
page has been identified and isolated, which may lead to calling
set_mce_nospec() to change page attribute, etc.
Here memory_failure() return -EOPNOTSUPP to indicate that the error
event is filtered, mce handler should not take any action for this
situation and hwpoison injector should treat as correct.
Link: https://lkml.kernel.org/r/20220223082135.2769649-1-luofei@unicloud.com
Signed-off-by: luofei <luofei@unicloud.com>
Acked-by: Borislav Petkov <bp@suse.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/madvise.c')
| -rw-r--r-- | mm/madvise.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/madvise.c b/mm/madvise.c index 38d0f515d548..7b5d6fc99a90 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -1067,6 +1067,8 @@ static int madvise_inject_error(int behavior, pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n", pfn, start); ret = memory_failure(pfn, MF_COUNT_INCREASED); + if (ret == -EOPNOTSUPP) + ret = 0; } if (ret) |