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charset="US-ASCII"; x-default=true X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 01241A0002 X-Stat-Signature: n197ix8ux7wbe8te54q3tmsps4yggo9q X-Rspam-User: X-HE-Tag: 1774099766-600939 X-HE-Meta: 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 mShwFtzn EuO0X/zl7YyaN7+6uj5udGOrXxypJekZ4ang0IIo9ylQjwx8= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: zs_page_migrate() uses copy_page() to copy the contents of a zspage page during migration. However, copy_page() is not instrumented by KMSAN, so the shadow and origin metadata of the destination page are not updated. As a result, subsequent accesses to the migrated page are reported as use-after-free by KMSAN, despite the data being correctly copied. Add a kmsan_copy_page_meta() call after copy_page() to propagate the KMSAN metadata to the new page, matching what copy_highpage() does internally. Fixes: afb2d666d025 ("zsmalloc: use copy_page for full page copy") Signed-off-by: Shigeru Yoshida --- mm/zsmalloc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 2c1430bf8d57..79ef9d57f2e1 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -1741,6 +1741,7 @@ static int zs_page_migrate(struct page *newpage, struct page *page, */ d_addr = kmap_local_zpdesc(newzpdesc); copy_page(d_addr, s_addr); + kmsan_copy_page_meta(zpdesc_page(newzpdesc), zpdesc_page(zpdesc)); kunmap_local(d_addr); for (addr = s_addr + offset; addr < s_addr + PAGE_SIZE; -- 2.52.0