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[RFCv2,09/13] shmem: Fail shmem_getpage_gfp() on poisoned pages

Message ID 20210416154106.23721-10-kirill.shutemov@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series TDX and guest memory unmapping | expand

Commit Message

Kirill A . Shutemov April 16, 2021, 3:41 p.m. UTC 
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 <kirill.shutemov@linux.intel.com>
---
 mm/shmem.c | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

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);