[RFCv2 09/13] shmem: Fail shmem_getpage_gfp() on poisoned pages
From: Kirill A. Shutemov <hidden>
Date: 2021-04-16 15:42:01
Also in:
kvm, lkml
Subsystem:
memory management, the rest, tmpfs (shmem filesystem) · Maintainers:
Andrew Morton, Linus Torvalds, Hugh Dickins
Forbid access to poisoned pages. TODO: Probably more fine-grained approach is needed. It shuld be a allowed to fault-in these pages as hwpoison entries. Not-Signed-off-by: Kirill A. Shutemov [off-list ref] --- mm/shmem.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/mm/shmem.c b/mm/shmem.c
index 7c6b6d8f6c39..d29a0c9be19c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c@@ -1832,6 +1832,13 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, if (page) hindex = page->index; + + if (page && PageHWPoison(page)) { + unlock_page(page); + put_page(page); + return -EIO; + } + if (page && sgp == SGP_WRITE) mark_page_accessed(page);
--
2.26.3