On 26.07.23 12:57, David Howells wrote:
Fix error handling in extract_iter_to_sg(). Pages need to be unpinned, not
put in extract_user_to_sg() when handling IOVEC/UBUF sources.
The bug may result in a warning like the following:
WARNING: CPU: 1 PID: 20384 at mm/gup.c:229 __lse_atomic_add
arch/arm64/include/asm/atomic_lse.h:27 [inline]
WARNING: CPU: 1 PID: 20384 at mm/gup.c:229 arch_atomic_add
arch/arm64/include/asm/atomic.h:28 [inline]
WARNING: CPU: 1 PID: 20384 at mm/gup.c:229 raw_atomic_add
include/linux/atomic/atomic-arch-fallback.h:537 [inline]
WARNING: CPU: 1 PID: 20384 at mm/gup.c:229 atomic_add
include/linux/atomic/atomic-instrumented.h:105 [inline]
WARNING: CPU: 1 PID: 20384 at mm/gup.c:229 try_grab_page+0x108/0x160
mm/gup.c:252
...
pc : try_grab_page+0x108/0x160 mm/gup.c:229
lr : follow_page_pte+0x174/0x3e4 mm/gup.c:651
...
Call trace:
__lse_atomic_add arch/arm64/include/asm/atomic_lse.h:27 [inline]
arch_atomic_add arch/arm64/include/asm/atomic.h:28 [inline]
raw_atomic_add include/linux/atomic/atomic-arch-fallback.h:537 [inline]
atomic_add include/linux/atomic/atomic-instrumented.h:105 [inline]
try_grab_page+0x108/0x160 mm/gup.c:252
follow_pmd_mask mm/gup.c:734 [inline]
follow_pud_mask mm/gup.c:765 [inline]
follow_p4d_mask mm/gup.c:782 [inline]
follow_page_mask+0x12c/0x2e4 mm/gup.c:839
__get_user_pages+0x174/0x30c mm/gup.c:1217
__get_user_pages_locked mm/gup.c:1448 [inline]
__gup_longterm_locked+0x94/0x8f4 mm/gup.c:2142
internal_get_user_pages_fast+0x970/0xb60 mm/gup.c:3140
pin_user_pages_fast+0x4c/0x60 mm/gup.c:3246
iov_iter_extract_user_pages lib/iov_iter.c:1768 [inline]
iov_iter_extract_pages+0xc8/0x54c lib/iov_iter.c:1831
extract_user_to_sg lib/scatterlist.c:1123 [inline]
extract_iter_to_sg lib/scatterlist.c:1349 [inline]
extract_iter_to_sg+0x26c/0x6fc lib/scatterlist.c:1339
hash_sendmsg+0xc0/0x43c crypto/algif_hash.c:117
sock_sendmsg_nosec net/socket.c:725 [inline]
sock_sendmsg+0x54/0x60 net/socket.c:748
____sys_sendmsg+0x270/0x2ac net/socket.c:2494
___sys_sendmsg+0x80/0xdc net/socket.c:2548
__sys_sendmsg+0x68/0xc4 net/socket.c:2577
__do_sys_sendmsg net/socket.c:2586 [inline]
__se_sys_sendmsg net/socket.c:2584 [inline]
__arm64_sys_sendmsg+0x24/0x30 net/socket.c:2584
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52
el0_svc_common.constprop.0+0x44/0xe4 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x38/0xa4 arch/arm64/kernel/syscall.c:191
el0_svc+0x2c/0xb0 arch/arm64/kernel/entry-common.c:647
el0t_64_sync_handler+0xc0/0xc4 arch/arm64/kernel/entry-common.c:665
el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:591
Fixes: 018584697533 ("netfs: Add a function to extract an iterator into a
scatterlist")
Reported-by: syzbot+9b82859567f2e50c1...@syzkaller.appspotmail.com
Link: https://lore.kernel.org/linux-mm/000000000000273d0105ff97b...@google.com/
Signed-off-by: David Howells <dhowe...@redhat.com>
cc: Sven Schnelle <sv...@linux.ibm.com>
cc: a...@linux-foundation.org
cc: Herbert Xu <herb...@gondor.apana.org.au>
cc: "David S. Miller" <da...@davemloft.net>
cc: Jeff Layton <jlay...@kernel.org>
cc: Steve French <sfre...@samba.org>
cc: Shyam Prasad N <nspmangal...@gmail.com>
cc: Rohith Surabattula <rohiths.m...@gmail.com>
cc: Jens Axboe <ax...@kernel.dk>
cc: Herbert Xu <herb...@gondor.apana.org.au>
cc: "David S. Miller" <da...@davemloft.net>
cc: Eric Dumazet <eduma...@google.com>
cc: Jakub Kicinski <k...@kernel.org>
cc: Paolo Abeni <pab...@redhat.com>
cc: Matthew Wilcox <wi...@infradead.org>
cc: linux...@kvack.org
cc: linux-cry...@vger.kernel.org
cc: linux-cachefs@redhat.com
cc: linux-c...@vger.kernel.org
cc: linux-fsde...@vger.kernel.org
cc: net...@vger.kernel.org
---
lib/scatterlist.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index e86231a44c3d..c65566b4dc66 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -1148,7 +1148,7 @@ static ssize_t extract_user_to_sg(struct iov_iter *iter,
failed:
while (sgtable->nents > sgtable->orig_nents)
- put_page(sg_page(&sgtable->sgl[--sgtable->nents]));
+ unpin_user_page(sg_page(&sgtable->sgl[--sgtable->nents]));
return res;
}
Reviewed-by: David Hildenbrand <da...@redhat.com>
--
Cheers,
David / dhildenb
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