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Message-ID: <416eca24-6baf-69d9-21a2-c434a9744596@redhat.com>
Date: Wed, 26 Jul 2023 15:38:11 +0200
From: David Hildenbrand <david@...hat.com>
To: David Howells <dhowells@...hat.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
Steve French <sfrench@...ba.org>
Cc: akpm@...ux-foundation.org, Sven Schnelle <svens@...ux.ibm.com>,
"David S. Miller" <davem@...emloft.net>,
Jeff Layton <jlayton@...nel.org>,
Shyam Prasad N <nspmangalore@...il.com>,
Rohith Surabattula <rohiths.msft@...il.com>,
Jens Axboe <axboe@...nel.dk>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Matthew Wilcox <willy@...radead.org>, linux-mm@...ck.org,
linux-crypto@...r.kernel.org, linux-cachefs@...hat.com,
linux-cifs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto, cifs: Fix error handling in extract_iter_to_sg()
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@...kaller.appspotmail.com
> Link: https://lore.kernel.org/linux-mm/000000000000273d0105ff97bf56@google.com/
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Sven Schnelle <svens@...ux.ibm.com>
> cc: akpm@...ux-foundation.org
> cc: Herbert Xu <herbert@...dor.apana.org.au>
> cc: "David S. Miller" <davem@...emloft.net>
> cc: Jeff Layton <jlayton@...nel.org>
> cc: Steve French <sfrench@...ba.org>
> cc: Shyam Prasad N <nspmangalore@...il.com>
> cc: Rohith Surabattula <rohiths.msft@...il.com>
> cc: Jens Axboe <axboe@...nel.dk>
> cc: Herbert Xu <herbert@...dor.apana.org.au>
> cc: "David S. Miller" <davem@...emloft.net>
> cc: Eric Dumazet <edumazet@...gle.com>
> cc: Jakub Kicinski <kuba@...nel.org>
> cc: Paolo Abeni <pabeni@...hat.com>
> cc: Matthew Wilcox <willy@...radead.org>
> cc: linux-mm@...ck.org
> cc: linux-crypto@...r.kernel.org
> cc: linux-cachefs@...hat.com
> cc: linux-cifs@...r.kernel.org
> cc: linux-fsdevel@...r.kernel.org
> cc: netdev@...r.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 <david@...hat.com>
--
Cheers,
David / dhildenb
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