* Re: memory leak in vhost_net_ioctl
[not found] <20190613141521.424-1-hdanton@sina.com>
@ 2019-06-13 14:55 ` Dmitry Vyukov
2019-06-13 18:26 ` syzbot
0 siblings, 1 reply; 7+ messages in thread
From: Dmitry Vyukov @ 2019-06-13 14:55 UTC (permalink / raw)
To: Hillf Danton
Cc: Michael S. Tsirkin, Jason Wang, syzbot, ast, bpf, daniel, davem,
hawk, jakub.kicinski, john.fastabend, kvm, linux-kernel, netdev,
syzkaller-bugs, virtualization, xdp-newbies, Asias He
[-- Attachment #1: Type: text/plain, Size: 6947 bytes --]
On Thu, Jun 13, 2019 at 4:15 PM Hillf Danton <hdanton@sina.com> wrote:
>
>
> Hello Dmitry
>
> On Thu, 13 Jun 2019 20:12:06 +0800 Dmitry Vyukov wrote:
> > On Thu, Jun 13, 2019 at 2:07 PM Hillf Danton <hdanton@sina.com> wrote:
> > >
> > > Hello Jason
> > >
> > > On Thu, 13 Jun 2019 17:10:39 +0800 Jason Wang wrote:
> > > >
> > > > This is basically a kfree(ubuf) after the second vhost_net_flush() in
> > > > vhost_net_release().
> > > >
> > > Fairly good catch.
> > >
> > > > Could you please post a formal patch?
> > > >
> > > I'd like very much to do that; but I wont, I am afraid, until I collect a
> > > Tested-by because of reproducer without a cutting edge.
> >
> > You can easily collect Tested-by from syzbot for any bug with a reproducer;)
> > https://github.com/google/syzkaller/blob/master/docs/syzbot.md#testing-patches
> >
> Thank you for the light you are casting.
:)
But you did not ask syzbot to test. That would be something like this
(keeping syzbot email in CC):
#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
master
(I've attached the patch because my email client is incapable of
sending non-corrupted patches inline, but otherwise inline patches
should work too).
> Here it goes.
> --->8--------
> From: Hillf Danton <hdanton@sina.com>
> Subject: [PATCH] vhost: fix memory leak in vhost_net_release
>
> syzbot found the following crash on:
>
> HEAD commit: 788a0249 Merge tag 'arc-5.2-rc4' of git://git.kernel.org/p..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x dc9ea6a00000
> kernel config: https://syzkaller.appspot.com/x/.config?xÕc73825cbdc7326
> dashboard link: https://syzkaller.appspot.com/bug?extid 89f0c7e45efd7bb643
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x b31761a00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x 4892c1a00000
>
>
> udit: type 00 audit(1559768703.229:36): avc: denied { map } for
> pidq16 comm="syz-executor330" path="/root/syz-executor330334897"
> dev="sda1" ino 461 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
> tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
> executing program
> executing program
>
> BUG: memory leak
> unreferenced object 0xffff88812421fe40 (size 64):
> comm "syz-executor330", pid 7117, jiffies 4294949245 (age 13.030s)
> hex dump (first 32 bytes):
> 01 00 00 00 20 69 6f 63 00 00 00 00 64 65 76 2f .... ioc....dev/
> 50 fe 21 24 81 88 ff ff 50 fe 21 24 81 88 ff ff P.!$....P.!$....
> backtrace:
> [<00000000ae0c4ae0>] kmemleak_alloc_recursive include/linux/kmemleak.h:55 [inline]
> [<00000000ae0c4ae0>] slab_post_alloc_hook mm/slab.h:439 [inline]
> [<00000000ae0c4ae0>] slab_alloc mm/slab.c:3326 [inline]
> [<00000000ae0c4ae0>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
> [<0000000079ebab38>] kmalloc include/linux/slab.h:547 [inline]
> [<0000000079ebab38>] vhost_net_ubuf_alloc drivers/vhost/net.c:241 [inline]
> [<0000000079ebab38>] vhost_net_set_backend drivers/vhost/net.c:1534 [inline]
> [<0000000079ebab38>] vhost_net_ioctl+0xb43/0xc10 drivers/vhost/net.c:1716
> [<000000009f6204a2>] vfs_ioctl fs/ioctl.c:46 [inline]
> [<000000009f6204a2>] file_ioctl fs/ioctl.c:509 [inline]
> [<000000009f6204a2>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
> [<00000000b45866de>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
> [<00000000dfb41eb8>] __do_sys_ioctl fs/ioctl.c:720 [inline]
> [<00000000dfb41eb8>] __se_sys_ioctl fs/ioctl.c:718 [inline]
> [<00000000dfb41eb8>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
> [<0000000049c1f547>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:301
> [<0000000029cc8ca7>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff88812421fa80 (size 64):
> comm "syz-executor330", pid 7130, jiffies 4294949755 (age 7.930s)
> hex dump (first 32 bytes):
> 01 00 00 00 01 00 00 00 00 00 00 00 2f 76 69 72 ............/vir
> 90 fa 21 24 81 88 ff ff 90 fa 21 24 81 88 ff ff ..!$......!$....
> backtrace:
> [<00000000ae0c4ae0>] kmemleak_alloc_recursive include/linux/kmemleak.h:55 [inline]
> [<00000000ae0c4ae0>] slab_post_alloc_hook mm/slab.h:439 [inline]
> [<00000000ae0c4ae0>] slab_alloc mm/slab.c:3326 [inline]
> [<00000000ae0c4ae0>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
> [<0000000079ebab38>] kmalloc include/linux/slab.h:547 [inline]
> [<0000000079ebab38>] vhost_net_ubuf_alloc drivers/vhost/net.c:241 [inline]
> [<0000000079ebab38>] vhost_net_set_backend drivers/vhost/net.c:1534 [inline]
> [<0000000079ebab38>] vhost_net_ioctl+0xb43/0xc10 drivers/vhost/net.c:1716
> [<000000009f6204a2>] vfs_ioctl fs/ioctl.c:46 [inline]
> [<000000009f6204a2>] file_ioctl fs/ioctl.c:509 [inline]
> [<000000009f6204a2>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
> [<00000000b45866de>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
> [<00000000dfb41eb8>] __do_sys_ioctl fs/ioctl.c:720 [inline]
> [<00000000dfb41eb8>] __se_sys_ioctl fs/ioctl.c:718 [inline]
> [<00000000dfb41eb8>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
> [<0000000049c1f547>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:301
> [<0000000029cc8ca7>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> End of syzbot report.
>
> The function vhost_net_ubuf_alloc() appears in the two cases of dump info, for
> pid 7130 and 7117, suggesting that it is ubuf leak.
>
> Since commit c38e39c378f4 ("vhost-net: fix use-after-free in vhost_net_flush")
> the function vhost_net_flush() had been no longer releasing ubuf.
>
> Freeing the slab after the last flush in the release path fixes it.
>
>
> Fixes: c38e39c378f4 ("vhost-net: fix use-after-free in vhost_net_flush")
> Reported-by: Syzbot <syzbot+0789f0c7e45efd7bb643@syzkaller.appspotmail.com>
> Suggested-by: Jason Wang <jasowang@redhat.com>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Cc: Asias He <asias@redhat.com>
> Signed-off-by: Hillf Danton <hdanton@sina.com>
> ---
> This is sent only for collecting Tested-by.
>
> drivers/vhost/net.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
> index 3beb401..22fae0a 100644
> --- a/drivers/vhost/net.c
> +++ b/drivers/vhost/net.c
> @@ -1404,6 +1404,7 @@ static int vhost_net_release(struct inode *inode, struct file *f)
> /* We do an extra flush before freeing memory,
> * since jobs can re-queue themselves. */
> vhost_net_flush(n);
> + kfree(n->vqs[VHOST_NET_VQ_TX].ubufs);
> kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue);
> kfree(n->vqs[VHOST_NET_VQ_TX].xdp);
> kfree(n->dev.vqs);
> --
>
[-- Attachment #2: patch --]
[-- Type: application/octet-stream, Size: 486 bytes --]
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 3beb401..22fae0a 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -1404,6 +1404,7 @@ static int vhost_net_release(struct inode *inode, struct file *f)
/* We do an extra flush before freeing memory,
* since jobs can re-queue themselves. */
vhost_net_flush(n);
+ kfree(n->vqs[VHOST_NET_VQ_TX].ubufs);
kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue);
kfree(n->vqs[VHOST_NET_VQ_TX].xdp);
kfree(n->dev.vqs);
--
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: memory leak in vhost_net_ioctl
2019-06-13 14:55 ` memory leak in vhost_net_ioctl Dmitry Vyukov
@ 2019-06-13 18:26 ` syzbot
0 siblings, 0 replies; 7+ messages in thread
From: syzbot @ 2019-06-13 18:26 UTC (permalink / raw)
To: asias, ast, bpf, daniel, davem, dvyukov, hawk, hdanton,
jakub.kicinski, jasowang, john.fastabend, kvm, linux-kernel, mst,
netdev, syzkaller-bugs, virtualization, xdp-newbies
Hello,
syzbot has tested the proposed patch but the reproducer still triggered
crash:
memory leak in vhost_net_ioctl
ANGE): hsr_slave_1: link becomes ready
2019/06/13 18:24:57 executed programs: 18
BUG: memory leak
unreferenced object 0xffff88811cbc6ac0 (size 64):
comm "syz-executor.0", pid 7196, jiffies 4294943804 (age 14.770s)
hex dump (first 32 bytes):
01 00 00 00 81 88 ff ff 00 00 00 00 82 88 ff ff ................
d0 6a bc 1c 81 88 ff ff d0 6a bc 1c 81 88 ff ff .j.......j......
backtrace:
[<000000006c752978>] kmemleak_alloc_recursive
include/linux/kmemleak.h:43 [inline]
[<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
[<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
[<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241
[inline]
[<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535
[inline]
[<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10
drivers/vhost/net.c:1717
[<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
[<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
[<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
[<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
[<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
[<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
[<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
[<00000000e4407a23>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301
[<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff88810b1365c0 (size 64):
comm "syz-executor.2", pid 7193, jiffies 4294943823 (age 14.580s)
hex dump (first 32 bytes):
01 00 00 00 81 88 ff ff 00 00 00 00 81 88 ff ff ................
d0 65 13 0b 81 88 ff ff d0 65 13 0b 81 88 ff ff .e.......e......
backtrace:
[<000000006c752978>] kmemleak_alloc_recursive
include/linux/kmemleak.h:43 [inline]
[<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
[<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
[<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241
[inline]
[<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535
[inline]
[<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10
drivers/vhost/net.c:1717
[<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
[<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
[<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
[<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
[<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
[<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
[<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
[<00000000e4407a23>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301
[<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff88810be23700 (size 64):
comm "syz-executor.3", pid 7194, jiffies 4294943823 (age 14.580s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 c9 ff ff ................
10 37 e2 0b 81 88 ff ff 10 37 e2 0b 81 88 ff ff .7.......7......
backtrace:
[<000000006c752978>] kmemleak_alloc_recursive
include/linux/kmemleak.h:43 [inline]
[<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
[<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
[<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241
[inline]
[<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535
[inline]
[<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10
drivers/vhost/net.c:1717
[<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
[<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
[<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
[<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
[<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
[<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
[<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
[<00000000e4407a23>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301
[<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff88810b136500 (size 64):
comm "syz-executor.6", pid 7228, jiffies 4294943827 (age 14.540s)
hex dump (first 32 bytes):
01 00 00 00 20 69 6f 63 00 00 00 00 64 65 76 2f .... ioc....dev/
10 65 13 0b 81 88 ff ff 10 65 13 0b 81 88 ff ff .e.......e......
backtrace:
[<000000006c752978>] kmemleak_alloc_recursive
include/linux/kmemleak.h:43 [inline]
[<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
[<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
[<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241
[inline]
[<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535
[inline]
[<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10
drivers/vhost/net.c:1717
[<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
[<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
[<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
[<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
[<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
[<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
[<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
[<00000000e4407a23>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301
[<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff88810b9cfec0 (size 64):
comm "syz-executor.7", pid 7236, jiffies 4294943829 (age 14.520s)
hex dump (first 32 bytes):
01 00 00 00 20 69 6f 63 00 00 00 00 64 65 76 2f .... ioc....dev/
d0 fe 9c 0b 81 88 ff ff d0 fe 9c 0b 81 88 ff ff ................
backtrace:
[<000000006c752978>] kmemleak_alloc_recursive
include/linux/kmemleak.h:43 [inline]
[<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
[<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
[<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241
[inline]
[<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535
[inline]
[<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10
drivers/vhost/net.c:1717
[<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
[<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
[<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
[<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
[<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
[<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
[<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
[<00000000e4407a23>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301
[<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff88810b9cd380 (size 64):
comm "syz-executor.4", pid 7218, jiffies 4294943834 (age 14.470s)
hex dump (first 32 bytes):
01 00 00 00 81 88 ff ff 00 00 00 00 81 88 ff ff ................
90 d3 9c 0b 81 88 ff ff 90 d3 9c 0b 81 88 ff ff ................
backtrace:
[<000000006c752978>] kmemleak_alloc_recursive
include/linux/kmemleak.h:43 [inline]
[<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
[<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
[<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241
[inline]
[<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535
[inline]
[<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10
drivers/vhost/net.c:1717
[<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
[<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
[<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
[<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
[<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
[<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
[<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
[<00000000e4407a23>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301
[<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Tested on:
commit: c11fb13a Merge branch 'for-linus' of git://git.kernel.org/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11c6b666a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=cb38d33cd06d8d48
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
patch: https://syzkaller.appspot.com/x/patch.diff?x=11ff0de1a00000
^ permalink raw reply [flat|nested] 7+ messages in thread
[parent not found: <20190614024519.6224-1-hdanton@sina.com>]
* Re: memory leak in vhost_net_ioctl
[not found] <20190614024519.6224-1-hdanton@sina.com>
@ 2019-06-14 3:04 ` syzbot
2019-06-14 7:58 ` Jeremy Sowden
0 siblings, 1 reply; 7+ messages in thread
From: syzbot @ 2019-06-14 3:04 UTC (permalink / raw)
To: ast, bpf, daniel, davem, dvyukov, hawk, hdanton, jakub.kicinski,
jasowang, john.fastabend, kvm, linux-kernel, mst, netdev,
syzkaller-bugs, virtualization, xdp-newbies
Hello,
syzbot has tested the proposed patch but the reproducer still triggered
crash:
memory leak in batadv_tvlv_handler_register
484.626788][ T156] bond0 (unregistering): Releasing backup interface
bond_slave_1
Warning: Permanently added '10.128.0.87' (ECDSA) to the list of known hosts.
BUG: memory leak
unreferenced object 0xffff88811d25c4c0 (size 64):
comm "softirq", pid 0, jiffies 4294943668 (age 434.830s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 e0 fc 5b 20 81 88 ff ff ..........[ ....
00 00 00 00 00 00 00 00 20 91 15 83 ff ff ff ff ........ .......
backtrace:
[<000000000045bc9d>] kmemleak_alloc_recursive
include/linux/kmemleak.h:43 [inline]
[<000000000045bc9d>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<000000000045bc9d>] slab_alloc mm/slab.c:3326 [inline]
[<000000000045bc9d>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<00000000197d773e>] kmalloc include/linux/slab.h:547 [inline]
[<00000000197d773e>] kzalloc include/linux/slab.h:742 [inline]
[<00000000197d773e>] batadv_tvlv_handler_register+0xae/0x140
net/batman-adv/tvlv.c:529
[<00000000fa9f11af>] batadv_tt_init+0x78/0x180
net/batman-adv/translation-table.c:4411
[<000000008c50839d>] batadv_mesh_init+0x196/0x230
net/batman-adv/main.c:208
[<000000001c5a74a3>] batadv_softif_init_late+0x1ca/0x220
net/batman-adv/soft-interface.c:861
[<000000004e676cd1>] register_netdevice+0xbf/0x600 net/core/dev.c:8635
[<000000005601497b>] __rtnl_newlink+0xaca/0xb30
net/core/rtnetlink.c:3199
[<00000000ad02cf5e>] rtnl_newlink+0x4e/0x80 net/core/rtnetlink.c:3245
[<00000000eceb53af>] rtnetlink_rcv_msg+0x178/0x4b0
net/core/rtnetlink.c:5214
[<00000000140451f6>] netlink_rcv_skb+0x61/0x170
net/netlink/af_netlink.c:2482
[<00000000237e38f7>] rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5232
[<000000000d47c000>] netlink_unicast_kernel
net/netlink/af_netlink.c:1307 [inline]
[<000000000d47c000>] netlink_unicast+0x1ec/0x2d0
net/netlink/af_netlink.c:1333
[<0000000098503d79>] netlink_sendmsg+0x26a/0x480
net/netlink/af_netlink.c:1922
[<000000009263e868>] sock_sendmsg_nosec net/socket.c:646 [inline]
[<000000009263e868>] sock_sendmsg+0x54/0x70 net/socket.c:665
[<000000007791ad47>] __sys_sendto+0x148/0x1f0 net/socket.c:1958
[<00000000d6f3807d>] __do_sys_sendto net/socket.c:1970 [inline]
[<00000000d6f3807d>] __se_sys_sendto net/socket.c:1966 [inline]
[<00000000d6f3807d>] __x64_sys_sendto+0x2a/0x30 net/socket.c:1966
BUG: memory leak
unreferenced object 0xffff8881024a3340 (size 64):
comm "softirq", pid 0, jiffies 4294943678 (age 434.730s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 e0 2c 66 04 81 88 ff ff .........,f.....
00 00 00 00 00 00 00 00 20 91 15 83 ff ff ff ff ........ .......
backtrace:
[<000000000045bc9d>] kmemleak_alloc_recursive
include/linux/kmemleak.h:43 [inline]
[<000000000045bc9d>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<000000000045bc9d>] slab_alloc mm/slab.c:3326 [inline]
[<000000000045bc9d>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<00000000197d773e>] kmalloc include/linux/slab.h:547 [inline]
[<00000000197d773e>] kzalloc include/linux/slab.h:742 [inline]
[<00000000197d773e>] batadv_tvlv_handler_register+0xae/0x140
net/batman-adv/tvlv.c:529
[<00000000fa9f11af>] batadv_tt_init+0x78/0x180
net/batman-adv/translation-table.c:4411
[<000000008c50839d>] batadv_mesh_init+0x196/0x230
net/batman-adv/main.c:208
[<000000001c5a74a3>] batadv_softif_init_late+0x1ca/0x220
net/batman-adv/soft-interface.c:861
[<000000004e676cd1>] register_netdevice+0xbf/0x600 net/core/dev.c:8635
[<000000005601497b>] __rtnl_newlink+0xaca/0xb30
net/core/rtnetlink.c:3199
[<00000000ad02cf5e>] rtnl_newlink+0x4e/0x80 net/core/rtnetlink.c:3245
[<00000000eceb53af>] rtnetlink_rcv_msg+0x178/0x4b0
net/core/rtnetlink.c:5214
[<00000000140451f6>] netlink_rcv_skb+0x61/0x170
net/netlink/af_netlink.c:2482
[<00000000237e38f7>] rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5232
[<000000000d47c000>] netlink_unicast_kernel
net/netlink/af_netlink.c:1307 [inline]
[<000000000d47c000>] netlink_unicast+0x1ec/0x2d0
net/netlink/af_netlink.c:1333
[<0000000098503d79>] netlink_sendmsg+0x26a/0x480
net/netlink/af_netlink.c:1922
[<000000009263e868>] sock_sendmsg_nosec net/socket.c:646 [inline]
[<000000009263e868>] sock_sendmsg+0x54/0x70 net/socket.c:665
[<000000007791ad47>] __sys_sendto+0x148/0x1f0 net/socket.c:1958
[<00000000d6f3807d>] __do_sys_sendto net/socket.c:1970 [inline]
[<00000000d6f3807d>] __se_sys_sendto net/socket.c:1966 [inline]
[<00000000d6f3807d>] __x64_sys_sendto+0x2a/0x30 net/socket.c:1966
BUG: memory leak
unreferenced object 0xffff888108a71b80 (size 128):
comm "syz-executor.3", pid 7367, jiffies 4294943696 (age 434.550s)
hex dump (first 32 bytes):
f0 f8 bf 02 81 88 ff ff f0 f8 bf 02 81 88 ff ff ................
1a dc 77 da 54 a0 be 41 64 20 e9 56 ff ff ff ff ..w.T..Ad .V....
backtrace:
[<000000000045bc9d>] kmemleak_alloc_recursive
include/linux/kmemleak.h:43 [inline]
[<000000000045bc9d>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<000000000045bc9d>] slab_alloc mm/slab.c:3326 [inline]
[<000000000045bc9d>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<00000000cc6863ae>] kmalloc include/linux/slab.h:547 [inline]
[<00000000cc6863ae>] hsr_create_self_node+0x42/0x150
net/hsr/hsr_framereg.c:84
[<000000000e2bb6b0>] hsr_dev_finalize+0xa4/0x233
net/hsr/hsr_device.c:441
[<000000003b100a4a>] hsr_newlink+0xf3/0x140 net/hsr/hsr_netlink.c:69
[<00000000b5efb0eb>] __rtnl_newlink+0x892/0xb30
net/core/rtnetlink.c:3187
[<00000000ad02cf5e>] rtnl_newlink+0x4e/0x80 net/core/rtnetlink.c:3245
[<00000000eceb53af>] rtnetlink_rcv_msg+0x178/0x4b0
net/core/rtnetlink.c:5214
[<00000000140451f6>] netlink_rcv_skb+0x61/0x170
net/netlink/af_netlink.c:2482
[<00000000237e38f7>] rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5232
[<000000000d47c000>] netlink_unicast_kernel
net/netlink/af_netlink.c:1307 [inline]
[<000000000d47c000>] netlink_unicast+0x1ec/0x2d0
net/netlink/af_netlink.c:1333
[<0000000098503d79>] netlink_sendmsg+0x26a/0x480
net/netlink/af_netlink.c:1922
[<000000009263e868>] sock_sendmsg_nosec net/socket.c:646 [inline]
[<000000009263e868>] sock_sendmsg+0x54/0x70 net/socket.c:665
[<000000007791ad47>] __sys_sendto+0x148/0x1f0 net/socket.c:1958
[<00000000d6f3807d>] __do_sys_sendto net/socket.c:1970 [inline]
[<00000000d6f3807d>] __se_sys_sendto net/socket.c:1966 [inline]
[<00000000d6f3807d>] __x64_sys_sendto+0x2a/0x30 net/socket.c:1966
[<000000003ba31db7>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301
[<0000000075c8daad>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Tested on:
commit: c11fb13a Merge branch 'for-linus' of git://git.kernel.org/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15c8f3b6a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=cb38d33cd06d8d48
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
patch: https://syzkaller.appspot.com/x/patch.diff?x=12477101a00000
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: memory leak in vhost_net_ioctl
2019-06-14 3:04 ` syzbot
@ 2019-06-14 7:58 ` Jeremy Sowden
0 siblings, 0 replies; 7+ messages in thread
From: Jeremy Sowden @ 2019-06-14 7:58 UTC (permalink / raw)
To: syzbot
Cc: ast, bpf, daniel, davem, dvyukov, hawk, hdanton, jakub.kicinski,
jasowang, john.fastabend, kvm, linux-kernel, mst, netdev,
syzkaller-bugs, virtualization, xdp-newbies
[-- Attachment #1: Type: text/plain, Size: 7749 bytes --]
On 2019-06-13, at 20:04:01 -0700, syzbot wrote:
> syzbot has tested the proposed patch but the reproducer still
> triggered crash: memory leak in batadv_tvlv_handler_register
There's already a fix for this batman leak:
https://lore.kernel.org/netdev/00000000000017d64c058965f966@google.com/
https://www.open-mesh.org/issues/378
> 484.626788][ T156] bond0 (unregistering): Releasing backup
> interface bond_slave_1
> Warning: Permanently added '10.128.0.87' (ECDSA) to the list of known
> hosts.
> BUG: memory leak
> unreferenced object 0xffff88811d25c4c0 (size 64):
> comm "softirq", pid 0, jiffies 4294943668 (age 434.830s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 e0 fc 5b 20 81 88 ff ff ..........[ ....
> 00 00 00 00 00 00 00 00 20 91 15 83 ff ff ff ff ........ .......
> backtrace:
> [<000000000045bc9d>] kmemleak_alloc_recursive
> include/linux/kmemleak.h:43 [inline]
> [<000000000045bc9d>] slab_post_alloc_hook mm/slab.h:439 [inline]
> [<000000000045bc9d>] slab_alloc mm/slab.c:3326 [inline]
> [<000000000045bc9d>] kmem_cache_alloc_trace+0x13d/0x280
> mm/slab.c:3553
> [<00000000197d773e>] kmalloc include/linux/slab.h:547 [inline]
> [<00000000197d773e>] kzalloc include/linux/slab.h:742 [inline]
> [<00000000197d773e>] batadv_tvlv_handler_register+0xae/0x140
> net/batman-adv/tvlv.c:529
> [<00000000fa9f11af>] batadv_tt_init+0x78/0x180
> net/batman-adv/translation-table.c:4411
> [<000000008c50839d>] batadv_mesh_init+0x196/0x230
> net/batman-adv/main.c:208
> [<000000001c5a74a3>] batadv_softif_init_late+0x1ca/0x220
> net/batman-adv/soft-interface.c:861
> [<000000004e676cd1>] register_netdevice+0xbf/0x600
> net/core/dev.c:8635
> [<000000005601497b>] __rtnl_newlink+0xaca/0xb30
> net/core/rtnetlink.c:3199
> [<00000000ad02cf5e>] rtnl_newlink+0x4e/0x80
> net/core/rtnetlink.c:3245
> [<00000000eceb53af>] rtnetlink_rcv_msg+0x178/0x4b0
> net/core/rtnetlink.c:5214
> [<00000000140451f6>] netlink_rcv_skb+0x61/0x170
> net/netlink/af_netlink.c:2482
> [<00000000237e38f7>] rtnetlink_rcv+0x1d/0x30
> net/core/rtnetlink.c:5232
> [<000000000d47c000>] netlink_unicast_kernel
> net/netlink/af_netlink.c:1307 [inline]
> [<000000000d47c000>] netlink_unicast+0x1ec/0x2d0
> net/netlink/af_netlink.c:1333
> [<0000000098503d79>] netlink_sendmsg+0x26a/0x480
> net/netlink/af_netlink.c:1922
> [<000000009263e868>] sock_sendmsg_nosec net/socket.c:646 [inline]
> [<000000009263e868>] sock_sendmsg+0x54/0x70 net/socket.c:665
> [<000000007791ad47>] __sys_sendto+0x148/0x1f0 net/socket.c:1958
> [<00000000d6f3807d>] __do_sys_sendto net/socket.c:1970 [inline]
> [<00000000d6f3807d>] __se_sys_sendto net/socket.c:1966 [inline]
> [<00000000d6f3807d>] __x64_sys_sendto+0x2a/0x30 net/socket.c:1966
>
> BUG: memory leak
> unreferenced object 0xffff8881024a3340 (size 64):
> comm "softirq", pid 0, jiffies 4294943678 (age 434.730s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 e0 2c 66 04 81 88 ff ff .........,f.....
> 00 00 00 00 00 00 00 00 20 91 15 83 ff ff ff ff ........ .......
> backtrace:
> [<000000000045bc9d>] kmemleak_alloc_recursive
> include/linux/kmemleak.h:43 [inline]
> [<000000000045bc9d>] slab_post_alloc_hook mm/slab.h:439 [inline]
> [<000000000045bc9d>] slab_alloc mm/slab.c:3326 [inline]
> [<000000000045bc9d>] kmem_cache_alloc_trace+0x13d/0x280
> mm/slab.c:3553
> [<00000000197d773e>] kmalloc include/linux/slab.h:547 [inline]
> [<00000000197d773e>] kzalloc include/linux/slab.h:742 [inline]
> [<00000000197d773e>] batadv_tvlv_handler_register+0xae/0x140
> net/batman-adv/tvlv.c:529
> [<00000000fa9f11af>] batadv_tt_init+0x78/0x180
> net/batman-adv/translation-table.c:4411
> [<000000008c50839d>] batadv_mesh_init+0x196/0x230
> net/batman-adv/main.c:208
> [<000000001c5a74a3>] batadv_softif_init_late+0x1ca/0x220
> net/batman-adv/soft-interface.c:861
> [<000000004e676cd1>] register_netdevice+0xbf/0x600
> net/core/dev.c:8635
> [<000000005601497b>] __rtnl_newlink+0xaca/0xb30
> net/core/rtnetlink.c:3199
> [<00000000ad02cf5e>] rtnl_newlink+0x4e/0x80
> net/core/rtnetlink.c:3245
> [<00000000eceb53af>] rtnetlink_rcv_msg+0x178/0x4b0
> net/core/rtnetlink.c:5214
> [<00000000140451f6>] netlink_rcv_skb+0x61/0x170
> net/netlink/af_netlink.c:2482
> [<00000000237e38f7>] rtnetlink_rcv+0x1d/0x30
> net/core/rtnetlink.c:5232
> [<000000000d47c000>] netlink_unicast_kernel
> net/netlink/af_netlink.c:1307 [inline]
> [<000000000d47c000>] netlink_unicast+0x1ec/0x2d0
> net/netlink/af_netlink.c:1333
> [<0000000098503d79>] netlink_sendmsg+0x26a/0x480
> net/netlink/af_netlink.c:1922
> [<000000009263e868>] sock_sendmsg_nosec net/socket.c:646 [inline]
> [<000000009263e868>] sock_sendmsg+0x54/0x70 net/socket.c:665
> [<000000007791ad47>] __sys_sendto+0x148/0x1f0 net/socket.c:1958
> [<00000000d6f3807d>] __do_sys_sendto net/socket.c:1970 [inline]
> [<00000000d6f3807d>] __se_sys_sendto net/socket.c:1966 [inline]
> [<00000000d6f3807d>] __x64_sys_sendto+0x2a/0x30 net/socket.c:1966
>
> BUG: memory leak
> unreferenced object 0xffff888108a71b80 (size 128):
> comm "syz-executor.3", pid 7367, jiffies 4294943696 (age 434.550s)
> hex dump (first 32 bytes):
> f0 f8 bf 02 81 88 ff ff f0 f8 bf 02 81 88 ff ff ................
> 1a dc 77 da 54 a0 be 41 64 20 e9 56 ff ff ff ff ..w.T..Ad .V....
> backtrace:
> [<000000000045bc9d>] kmemleak_alloc_recursive
> include/linux/kmemleak.h:43 [inline]
> [<000000000045bc9d>] slab_post_alloc_hook mm/slab.h:439 [inline]
> [<000000000045bc9d>] slab_alloc mm/slab.c:3326 [inline]
> [<000000000045bc9d>] kmem_cache_alloc_trace+0x13d/0x280
> mm/slab.c:3553
> [<00000000cc6863ae>] kmalloc include/linux/slab.h:547 [inline]
> [<00000000cc6863ae>] hsr_create_self_node+0x42/0x150
> net/hsr/hsr_framereg.c:84
> [<000000000e2bb6b0>] hsr_dev_finalize+0xa4/0x233
> net/hsr/hsr_device.c:441
> [<000000003b100a4a>] hsr_newlink+0xf3/0x140
> net/hsr/hsr_netlink.c:69
> [<00000000b5efb0eb>] __rtnl_newlink+0x892/0xb30
> net/core/rtnetlink.c:3187
> [<00000000ad02cf5e>] rtnl_newlink+0x4e/0x80
> net/core/rtnetlink.c:3245
> [<00000000eceb53af>] rtnetlink_rcv_msg+0x178/0x4b0
> net/core/rtnetlink.c:5214
> [<00000000140451f6>] netlink_rcv_skb+0x61/0x170
> net/netlink/af_netlink.c:2482
> [<00000000237e38f7>] rtnetlink_rcv+0x1d/0x30
> net/core/rtnetlink.c:5232
> [<000000000d47c000>] netlink_unicast_kernel
> net/netlink/af_netlink.c:1307 [inline]
> [<000000000d47c000>] netlink_unicast+0x1ec/0x2d0
> net/netlink/af_netlink.c:1333
> [<0000000098503d79>] netlink_sendmsg+0x26a/0x480
> net/netlink/af_netlink.c:1922
> [<000000009263e868>] sock_sendmsg_nosec net/socket.c:646 [inline]
> [<000000009263e868>] sock_sendmsg+0x54/0x70 net/socket.c:665
> [<000000007791ad47>] __sys_sendto+0x148/0x1f0 net/socket.c:1958
> [<00000000d6f3807d>] __do_sys_sendto net/socket.c:1970 [inline]
> [<00000000d6f3807d>] __se_sys_sendto net/socket.c:1966 [inline]
> [<00000000d6f3807d>] __x64_sys_sendto+0x2a/0x30 net/socket.c:1966
> [<000000003ba31db7>] do_syscall_64+0x76/0x1a0
> arch/x86/entry/common.c:301
> [<0000000075c8daad>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> Tested on:
>
> commit: c11fb13a Merge branch 'for-linus' of git://git.kernel.org/..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=15c8f3b6a00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=cb38d33cd06d8d48
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> patch: https://syzkaller.appspot.com/x/patch.diff?x=12477101a00000
J.
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^ permalink raw reply [flat|nested] 7+ messages in thread
[parent not found: <20190613120659.10680-1-hdanton@sina.com>]
* Re: memory leak in vhost_net_ioctl
[not found] <20190613120659.10680-1-hdanton@sina.com>
@ 2019-06-13 12:11 ` Dmitry Vyukov
0 siblings, 0 replies; 7+ messages in thread
From: Dmitry Vyukov @ 2019-06-13 12:11 UTC (permalink / raw)
To: Hillf Danton
Cc: Jason Wang, syzbot, ast, bpf, daniel, davem, hawk,
jakub.kicinski, john.fastabend, kvm, linux-kernel, mst, netdev,
syzkaller-bugs, virtualization, xdp-newbies
On Thu, Jun 13, 2019 at 2:07 PM Hillf Danton <hdanton@sina.com> wrote:
>
>
> Hello Jason
>
> On Thu, 13 Jun 2019 17:10:39 +0800 Jason Wang wrote:
> >
> > This is basically a kfree(ubuf) after the second vhost_net_flush() in
> > vhost_net_release().
> >
> Fairly good catch.
>
> > Could you please post a formal patch?
> >
> I'd like very much to do that; but I wont, I am afraid, until I collect a
> Tested-by because of reproducer without a cutting edge.
You can easily collect Tested-by from syzbot for any bug with a reproducer ;)
https://github.com/google/syzkaller/blob/master/docs/syzbot.md#testing-patches
^ permalink raw reply [flat|nested] 7+ messages in thread
[parent not found: <20190606144013.9884-1-hdanton@sina.com>]
* Re: memory leak in vhost_net_ioctl
[not found] <20190606144013.9884-1-hdanton@sina.com>
@ 2019-06-13 9:09 ` Jason Wang
0 siblings, 0 replies; 7+ messages in thread
From: Jason Wang @ 2019-06-13 9:09 UTC (permalink / raw)
To: Hillf Danton, syzbot
Cc: ast, bpf, daniel, davem, hawk, jakub.kicinski, john.fastabend,
kvm, linux-kernel, mst, netdev, syzkaller-bugs, virtualization,
xdp-newbies
On 2019/6/6 下午10:40, Hillf Danton wrote:
>
> On Wed, 05 Jun 2019 16:42:05 -0700 (PDT) syzbot wrote:
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit: 788a0249 Merge tag 'arc-5.2-rc4' of
>> git://git.kernel.org/p..
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=15dc9ea6a00000
>> kernel config:
>> https://syzkaller.appspot.com/x/.config?x=d5c73825cbdc7326
>> dashboard link:
>> https://syzkaller.appspot.com/bug?extid=0789f0c7e45efd7bb643
>> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b31761a00000
>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=124892c1a00000
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the
>> commit:
>> Reported-by: syzbot+0789f0c7e45efd7bb643@syzkaller.appspotmail.com
>>
>> udit: type=1400 audit(1559768703.229:36): avc: denied { map } for
>> pid=7116 comm="syz-executor330" path="/root/syz-executor330334897"
>> dev="sda1" ino=16461
>> scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
>> tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
>> executing program
>> executing program
>> BUG: memory leak
>> unreferenced object 0xffff88812421fe40 (size 64):
>> comm "syz-executor330", pid 7117, jiffies 4294949245 (age 13.030s)
>> hex dump (first 32 bytes):
>> 01 00 00 00 20 69 6f 63 00 00 00 00 64 65 76 2f .... ioc....dev/
>> 50 fe 21 24 81 88 ff ff 50 fe 21 24 81 88 ff ff P.!$....P.!$....
>> backtrace:
>> [<00000000ae0c4ae0>] kmemleak_alloc_recursive
>> include/linux/kmemleak.h:55 [inline]
>> [<00000000ae0c4ae0>] slab_post_alloc_hook mm/slab.h:439 [inline]
>> [<00000000ae0c4ae0>] slab_alloc mm/slab.c:3326 [inline]
>> [<00000000ae0c4ae0>] kmem_cache_alloc_trace+0x13d/0x280
>> mm/slab.c:3553
>> [<0000000079ebab38>] kmalloc include/linux/slab.h:547 [inline]
>> [<0000000079ebab38>] vhost_net_ubuf_alloc
>> drivers/vhost/net.c:241 [inline]
>> [<0000000079ebab38>] vhost_net_set_backend
>> drivers/vhost/net.c:1534 [inline]
>> [<0000000079ebab38>] vhost_net_ioctl+0xb43/0xc10
>> drivers/vhost/net.c:1716
>> [<000000009f6204a2>] vfs_ioctl fs/ioctl.c:46 [inline]
>> [<000000009f6204a2>] file_ioctl fs/ioctl.c:509 [inline]
>> [<000000009f6204a2>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
>> [<00000000b45866de>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
>> [<00000000dfb41eb8>] __do_sys_ioctl fs/ioctl.c:720 [inline]
>> [<00000000dfb41eb8>] __se_sys_ioctl fs/ioctl.c:718 [inline]
>> [<00000000dfb41eb8>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
>> [<0000000049c1f547>] do_syscall_64+0x76/0x1a0
>> arch/x86/entry/common.c:301
>> [<0000000029cc8ca7>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>
>> BUG: memory leak
>> unreferenced object 0xffff88812421fa80 (size 64):
>> comm "syz-executor330", pid 7130, jiffies 4294949755 (age 7.930s)
>> hex dump (first 32 bytes):
>> 01 00 00 00 01 00 00 00 00 00 00 00 2f 76 69 72 ............/vir
>> 90 fa 21 24 81 88 ff ff 90 fa 21 24 81 88 ff ff ..!$......!$....
>> backtrace:
>> [<00000000ae0c4ae0>] kmemleak_alloc_recursive
>> include/linux/kmemleak.h:55 [inline]
>> [<00000000ae0c4ae0>] slab_post_alloc_hook mm/slab.h:439 [inline]
>> [<00000000ae0c4ae0>] slab_alloc mm/slab.c:3326 [inline]
>> [<00000000ae0c4ae0>] kmem_cache_alloc_trace+0x13d/0x280
>> mm/slab.c:3553
>> [<0000000079ebab38>] kmalloc include/linux/slab.h:547 [inline]
>> [<0000000079ebab38>] vhost_net_ubuf_alloc
>> drivers/vhost/net.c:241 [inline]
>> [<0000000079ebab38>] vhost_net_set_backend
>> drivers/vhost/net.c:1534 [inline]
>> [<0000000079ebab38>] vhost_net_ioctl+0xb43/0xc10
>> drivers/vhost/net.c:1716
>> [<000000009f6204a2>] vfs_ioctl fs/ioctl.c:46 [inline]
>> [<000000009f6204a2>] file_ioctl fs/ioctl.c:509 [inline]
>> [<000000009f6204a2>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
>> [<00000000b45866de>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
>> [<00000000dfb41eb8>] __do_sys_ioctl fs/ioctl.c:720 [inline]
>> [<00000000dfb41eb8>] __se_sys_ioctl fs/ioctl.c:718 [inline]
>> [<00000000dfb41eb8>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
>> [<0000000049c1f547>] do_syscall_64+0x76/0x1a0
>> arch/x86/entry/common.c:301
>> [<0000000029cc8ca7>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>
>>
>>
>> ---
>> This bug is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at syzkaller@googlegroups.com.
>>
>> syzbot will keep track of this bug report. See:
>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>> syzbot can test patches for this bug, for details see:
>> https://goo.gl/tpsmEJ#testing-patches
>>
> Ignore my noise if you have no interest seeing the syzbot report.
>
> After commit c38e39c378f46f ("vhost-net: fix use-after-free in
> vhost_net_flush") flush would no longer free ubuf, just wait until
> ubuf users
> disappear instead.
>
> The following diff, in hope that may perhaps help you handle the
> memory leak,
> makes flush able to free ubuf in the path of file release.
>
> Thanks
> Hillf
> ---
> drivers/vhost/net.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
> index 3beb401..dcf20b6 100644
> --- a/drivers/vhost/net.c
> +++ b/drivers/vhost/net.c
> @@ -141,6 +141,7 @@ struct vhost_net {
> unsigned tx_zcopy_err;
> /* Flush in progress. Protected by tx vq lock. */
> bool tx_flush;
> + bool ld; /* Last dinner */
> /* Private page frag */
> struct page_frag page_frag;
> /* Refcount bias of page frag */
> @@ -1283,6 +1284,7 @@ static int vhost_net_open(struct inode *inode,
> struct file *f)
> n = kvmalloc(sizeof *n, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
> if (!n)
> return -ENOMEM;
> + n->ld = false;
> vqs = kmalloc_array(VHOST_NET_VQ_MAX, sizeof(*vqs), GFP_KERNEL);
> if (!vqs) {
> kvfree(n);
> @@ -1376,7 +1378,10 @@ static void vhost_net_flush(struct vhost_net *n)
> n->tx_flush = true;
> mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex);
> /* Wait for all lower device DMAs done. */
> - vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs);
> + if (n->ld)
> + vhost_net_ubuf_put_wait_and_free(n->vqs[VHOST_NET_VQ_TX].ubufs);
> + else
> + vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs);
> mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex);
> n->tx_flush = false;
> atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1);
> @@ -1403,6 +1408,7 @@ static int vhost_net_release(struct inode
> *inode, struct file *f)
> synchronize_rcu();
> /* We do an extra flush before freeing memory,
> * since jobs can re-queue themselves. */
> + n->ld = true;
> vhost_net_flush(n);
> kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue);
> kfree(n->vqs[VHOST_NET_VQ_TX].xdp);
> --
This is basically a kfree(ubuf) after the second vhost_net_flush() in
vhost_net_release().
Could you please post a formal patch?
Thanks
^ permalink raw reply [flat|nested] 7+ messages in thread
* memory leak in vhost_net_ioctl
@ 2019-06-05 23:42 syzbot
0 siblings, 0 replies; 7+ messages in thread
From: syzbot @ 2019-06-05 23:42 UTC (permalink / raw)
To: ast, bpf, daniel, davem, hawk, jakub.kicinski, jasowang,
john.fastabend, kvm, linux-kernel, mst, netdev, syzkaller-bugs,
virtualization, xdp-newbies
Hello,
syzbot found the following crash on:
HEAD commit: 788a0249 Merge tag 'arc-5.2-rc4' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15dc9ea6a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d5c73825cbdc7326
dashboard link: https://syzkaller.appspot.com/bug?extid=0789f0c7e45efd7bb643
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b31761a00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=124892c1a00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+0789f0c7e45efd7bb643@syzkaller.appspotmail.com
udit: type=1400 audit(1559768703.229:36): avc: denied { map } for
pid=7116 comm="syz-executor330" path="/root/syz-executor330334897"
dev="sda1" ino=16461 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
executing program
executing program
BUG: memory leak
unreferenced object 0xffff88812421fe40 (size 64):
comm "syz-executor330", pid 7117, jiffies 4294949245 (age 13.030s)
hex dump (first 32 bytes):
01 00 00 00 20 69 6f 63 00 00 00 00 64 65 76 2f .... ioc....dev/
50 fe 21 24 81 88 ff ff 50 fe 21 24 81 88 ff ff P.!$....P.!$....
backtrace:
[<00000000ae0c4ae0>] kmemleak_alloc_recursive
include/linux/kmemleak.h:55 [inline]
[<00000000ae0c4ae0>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<00000000ae0c4ae0>] slab_alloc mm/slab.c:3326 [inline]
[<00000000ae0c4ae0>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<0000000079ebab38>] kmalloc include/linux/slab.h:547 [inline]
[<0000000079ebab38>] vhost_net_ubuf_alloc drivers/vhost/net.c:241
[inline]
[<0000000079ebab38>] vhost_net_set_backend drivers/vhost/net.c:1534
[inline]
[<0000000079ebab38>] vhost_net_ioctl+0xb43/0xc10
drivers/vhost/net.c:1716
[<000000009f6204a2>] vfs_ioctl fs/ioctl.c:46 [inline]
[<000000009f6204a2>] file_ioctl fs/ioctl.c:509 [inline]
[<000000009f6204a2>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
[<00000000b45866de>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
[<00000000dfb41eb8>] __do_sys_ioctl fs/ioctl.c:720 [inline]
[<00000000dfb41eb8>] __se_sys_ioctl fs/ioctl.c:718 [inline]
[<00000000dfb41eb8>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
[<0000000049c1f547>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301
[<0000000029cc8ca7>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff88812421fa80 (size 64):
comm "syz-executor330", pid 7130, jiffies 4294949755 (age 7.930s)
hex dump (first 32 bytes):
01 00 00 00 01 00 00 00 00 00 00 00 2f 76 69 72 ............/vir
90 fa 21 24 81 88 ff ff 90 fa 21 24 81 88 ff ff ..!$......!$....
backtrace:
[<00000000ae0c4ae0>] kmemleak_alloc_recursive
include/linux/kmemleak.h:55 [inline]
[<00000000ae0c4ae0>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<00000000ae0c4ae0>] slab_alloc mm/slab.c:3326 [inline]
[<00000000ae0c4ae0>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<0000000079ebab38>] kmalloc include/linux/slab.h:547 [inline]
[<0000000079ebab38>] vhost_net_ubuf_alloc drivers/vhost/net.c:241
[inline]
[<0000000079ebab38>] vhost_net_set_backend drivers/vhost/net.c:1534
[inline]
[<0000000079ebab38>] vhost_net_ioctl+0xb43/0xc10
drivers/vhost/net.c:1716
[<000000009f6204a2>] vfs_ioctl fs/ioctl.c:46 [inline]
[<000000009f6204a2>] file_ioctl fs/ioctl.c:509 [inline]
[<000000009f6204a2>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
[<00000000b45866de>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
[<00000000dfb41eb8>] __do_sys_ioctl fs/ioctl.c:720 [inline]
[<00000000dfb41eb8>] __se_sys_ioctl fs/ioctl.c:718 [inline]
[<00000000dfb41eb8>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
[<0000000049c1f547>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301
[<0000000029cc8ca7>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2019-06-14 8:38 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <20190613141521.424-1-hdanton@sina.com>
2019-06-13 14:55 ` memory leak in vhost_net_ioctl Dmitry Vyukov
2019-06-13 18:26 ` syzbot
[not found] <20190614024519.6224-1-hdanton@sina.com>
2019-06-14 3:04 ` syzbot
2019-06-14 7:58 ` Jeremy Sowden
[not found] <20190613120659.10680-1-hdanton@sina.com>
2019-06-13 12:11 ` Dmitry Vyukov
[not found] <20190606144013.9884-1-hdanton@sina.com>
2019-06-13 9:09 ` Jason Wang
2019-06-05 23:42 syzbot
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