From 9113eaf331bf44579882c001867773cf1b3364fd Mon Sep 17 00:00:00 2001 From: zhenwei pi Date: Thu, 12 May 2022 20:23:10 -0700 Subject: mm/memory-failure.c: add hwpoison_filter for soft offline hwpoison_filter is missing in the soft offline path, this leads an issue: after enabling the corrupt filter, the user process still has a chance to inject hwpoison fault by madvise(addr, len, MADV_SOFT_OFFLINE) at PFN which is expected to reject. Also do a minor change in comment of memory_failure(). Link: https://lkml.kernel.org/r/20220509105641.491313-4-pizhenwei@bytedance.com Signed-off-by: zhenwei pi Acked-by: Naoya Horiguchi Signed-off-by: Andrew Morton --- mm/memory-failure.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) (limited to 'mm') diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 837975af2152..7ee80350a9a5 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1751,7 +1751,7 @@ static DEFINE_MUTEX(mf_mutex); * enabled and no spinlocks hold. * * Return: 0 for successfully handled the memory error, - * -EOPNOTSUPP for memory_filter() filtered the error event, + * -EOPNOTSUPP for hwpoison_filter() filtered the error event, * < 0(except -EOPNOTSUPP) on failure. */ int memory_failure(unsigned long pfn, int flags) @@ -2308,7 +2308,9 @@ static void put_ref_page(struct page *page) * @pfn: pfn to soft-offline * @flags: flags. Same as memory_failure(). * - * Returns 0 on success, otherwise negated errno. + * Returns 0 on success + * -EOPNOTSUPP for hwpoison_filter() filtered the error event + * < 0 otherwise negated errno. * * Soft offline a page, by migration or invalidation, * without killing anything. This is for the case when @@ -2359,6 +2361,16 @@ retry: ret = get_hwpoison_page(page, flags | MF_SOFT_OFFLINE); put_online_mems(); + if (hwpoison_filter(page)) { + if (ret > 0) + put_page(page); + else + put_ref_page(ref_page); + + mutex_unlock(&mf_mutex); + return -EOPNOTSUPP; + } + if (ret > 0) { ret = soft_offline_in_use_page(page); } else if (ret == 0) { -- cgit v1.2.3-58-ga151