Re: [PATCH] crypto, cifs: Fix error handling in extract_iter_to_sg()

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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+9b82859567f2e50c123e@xxxxxxxxxxxxxxxxxxxxxxxxx
Link: https://lore.kernel.org/linux-mm/000000000000273d0105ff97bf56@xxxxxxxxxx/
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
cc: akpm@xxxxxxxxxxxxxxxxxxxx
cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
cc: Jeff Layton <jlayton@xxxxxxxxxx>
cc: Steve French <sfrench@xxxxxxxxx>
cc: Shyam Prasad N <nspmangalore@xxxxxxxxx>
cc: Rohith Surabattula <rohiths.msft@xxxxxxxxx>
cc: Jens Axboe <axboe@xxxxxxxxx>
cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
cc: Eric Dumazet <edumazet@xxxxxxxxxx>
cc: Jakub Kicinski <kuba@xxxxxxxxxx>
cc: Paolo Abeni <pabeni@xxxxxxxxxx>
cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
cc: linux-mm@xxxxxxxxx
cc: linux-crypto@xxxxxxxxxxxxxxx
cc: linux-cachefs@xxxxxxxxxx
cc: linux-cifs@xxxxxxxxxxxxxxx
cc: linux-fsdevel@xxxxxxxxxxxxxxx
cc: netdev@xxxxxxxxxxxxxxx
---
  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 <david@xxxxxxxxxx>

--
Cheers,

David / dhildenb




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