| Message ID | 20571.1690369076@warthog.procyon.org.uk (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | crypto, cifs: Fix error handling in extract_iter_to_sg() | expand |
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@syzkaller.appspotmail.com > Link: https://lore.kernel.org/linux-mm/000000000000273d0105ff97bf56@google.com/ > Signed-off-by: David Howells <dhowells@redhat.com> > cc: Sven Schnelle <svens@linux.ibm.com> > cc: akpm@linux-foundation.org > cc: Herbert Xu <herbert@gondor.apana.org.au> > cc: "David S. Miller" <davem@davemloft.net> > cc: Jeff Layton <jlayton@kernel.org> > cc: Steve French <sfrench@samba.org> > cc: Shyam Prasad N <nspmangalore@gmail.com> > cc: Rohith Surabattula <rohiths.msft@gmail.com> > cc: Jens Axboe <axboe@kernel.dk> > cc: Herbert Xu <herbert@gondor.apana.org.au> > cc: "David S. Miller" <davem@davemloft.net> > cc: Eric Dumazet <edumazet@google.com> > cc: Jakub Kicinski <kuba@kernel.org> > cc: Paolo Abeni <pabeni@redhat.com> > cc: Matthew Wilcox <willy@infradead.org> > cc: linux-mm@kvack.org > cc: linux-crypto@vger.kernel.org > cc: linux-cachefs@redhat.com > cc: linux-cifs@vger.kernel.org > cc: linux-fsdevel@vger.kernel.org > cc: netdev@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 <david@redhat.com>
Acked-off-by: Steve French <stfrench@microsoft.com> On Wed, Jul 26, 2023 at 8:56 AM David Hildenbrand <david@redhat.com> wrote: > > 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@syzkaller.appspotmail.com > > Link: https://lore.kernel.org/linux-mm/000000000000273d0105ff97bf56@google.com/ > > Signed-off-by: David Howells <dhowells@redhat.com> > > cc: Sven Schnelle <svens@linux.ibm.com> > > cc: akpm@linux-foundation.org > > cc: Herbert Xu <herbert@gondor.apana.org.au> > > cc: "David S. Miller" <davem@davemloft.net> > > cc: Jeff Layton <jlayton@kernel.org> > > cc: Steve French <sfrench@samba.org> > > cc: Shyam Prasad N <nspmangalore@gmail.com> > > cc: Rohith Surabattula <rohiths.msft@gmail.com> > > cc: Jens Axboe <axboe@kernel.dk> > > cc: Herbert Xu <herbert@gondor.apana.org.au> > > cc: "David S. Miller" <davem@davemloft.net> > > cc: Eric Dumazet <edumazet@google.com> > > cc: Jakub Kicinski <kuba@kernel.org> > > cc: Paolo Abeni <pabeni@redhat.com> > > cc: Matthew Wilcox <willy@infradead.org> > > cc: linux-mm@kvack.org > > cc: linux-crypto@vger.kernel.org > > cc: linux-cachefs@redhat.com > > cc: linux-cifs@vger.kernel.org > > cc: linux-fsdevel@vger.kernel.org > > cc: netdev@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 <david@redhat.com> > > -- > Cheers, > > David / dhildenb >
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; }
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@syzkaller.appspotmail.com Link: https://lore.kernel.org/linux-mm/000000000000273d0105ff97bf56@google.com/ Signed-off-by: David Howells <dhowells@redhat.com> cc: Sven Schnelle <svens@linux.ibm.com> cc: akpm@linux-foundation.org cc: Herbert Xu <herbert@gondor.apana.org.au> cc: "David S. Miller" <davem@davemloft.net> cc: Jeff Layton <jlayton@kernel.org> cc: Steve French <sfrench@samba.org> cc: Shyam Prasad N <nspmangalore@gmail.com> cc: Rohith Surabattula <rohiths.msft@gmail.com> cc: Jens Axboe <axboe@kernel.dk> cc: Herbert Xu <herbert@gondor.apana.org.au> cc: "David S. Miller" <davem@davemloft.net> cc: Eric Dumazet <edumazet@google.com> cc: Jakub Kicinski <kuba@kernel.org> cc: Paolo Abeni <pabeni@redhat.com> cc: Matthew Wilcox <willy@infradead.org> cc: linux-mm@kvack.org cc: linux-crypto@vger.kernel.org cc: linux-cachefs@redhat.com cc: linux-cifs@vger.kernel.org cc: linux-fsdevel@vger.kernel.org cc: netdev@vger.kernel.org --- lib/scatterlist.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)