KASAN: slab-out-of-bounds Read in vc_do_resize
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syzbot
Dec 19, 2019, 3:28:09 AM12/19/19
to daniel...@ffwll.ch, gha...@redhat.com, gre...@linuxfoundation.org, jsl...@suse.com, linux-...@vger.kernel.org, ni...@fluxnic.net, s...@ravnborg.org, syzkall...@googlegroups.com, text...@uchuujin.de
Hello,
syzbot found the following crash on:
HEAD commit: 2187f215 Merge tag 'for-5.5-rc2-tag' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16b0f2fee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=ab2ae0615387ef78
dashboard link: https://syzkaller.appspot.com/bug?extid=c37a14770d51a085a520
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c37a14...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:380 [inline]
BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49
[inline]
BUG: KASAN: slab-out-of-bounds in vc_do_resize+0x959/0x1460
drivers/tty/vt/vt.c:1250
Read of size 2 at addr ffff8880a284cd8c by task syz-executor.0/13609
CPU: 1 PID: 13609 Comm: syz-executor.0 Not tainted 5.5.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
__kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
kasan_report+0x12/0x20 mm/kasan/common.c:639
check_memory_region_inline mm/kasan/generic.c:185 [inline]
check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
memcpy+0x24/0x50 mm/kasan/common.c:125
memcpy include/linux/string.h:380 [inline]
scr_memcpyw include/linux/vt_buffer.h:49 [inline]
vc_do_resize+0x959/0x1460 drivers/tty/vt/vt.c:1250
vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304
fbcon_modechanged+0x367/0x790 drivers/video/fbdev/core/fbcon.c:2980
fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3038
fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1051
do_fb_ioctl+0x390/0x7d0 drivers/video/fbdev/core/fbmem.c:1104
fb_ioctl+0xe6/0x130 drivers/video/fbdev/core/fbmem.c:1180
vfs_ioctl fs/ioctl.c:47 [inline]
file_ioctl fs/ioctl.c:545 [inline]
do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
__do_sys_ioctl fs/ioctl.c:756 [inline]
__se_sys_ioctl fs/ioctl.c:754 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a919
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe4a3fd6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe4a3fd76d4
R13: 00000000004c310d R14: 00000000004d8478 R15: 00000000ffffffff
Allocated by task 13609:
save_stack+0x23/0x90 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
__kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
__do_kmalloc mm/slab.c:3656 [inline]
__kmalloc+0x163/0x770 mm/slab.c:3665
kmalloc include/linux/slab.h:561 [inline]
kzalloc include/linux/slab.h:670 [inline]
vc_do_resize+0x262/0x1460 drivers/tty/vt/vt.c:1187
vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304
fbcon_modechanged+0x367/0x790 drivers/video/fbdev/core/fbcon.c:2980
fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3038
fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1051
fbcon_resize+0x6b1/0x780 drivers/video/fbdev/core/fbcon.c:2222
resize_screen drivers/tty/vt/vt.c:1126 [inline]
vc_do_resize+0x440/0x1460 drivers/tty/vt/vt.c:1205
vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304
fbcon_modechanged+0x367/0x790 drivers/video/fbdev/core/fbcon.c:2980
fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3038
fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1051
do_fb_ioctl+0x390/0x7d0 drivers/video/fbdev/core/fbmem.c:1104
fb_ioctl+0xe6/0x130 drivers/video/fbdev/core/fbmem.c:1180
vfs_ioctl fs/ioctl.c:47 [inline]
file_ioctl fs/ioctl.c:545 [inline]
do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
__do_sys_ioctl fs/ioctl.c:756 [inline]
__se_sys_ioctl fs/ioctl.c:754 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 13273:
save_stack+0x23/0x90 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:335 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
__cache_free mm/slab.c:3426 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3757
tomoyo_path_perm+0x389/0x430 security/tomoyo/file.c:840
tomoyo_path_symlink+0xaa/0xf0 security/tomoyo/tomoyo.c:206
security_path_symlink+0x10a/0x170 security/security.c:1053
do_symlinkat+0x137/0x290 fs/namei.c:4156
__do_sys_symlink fs/namei.c:4177 [inline]
__se_sys_symlink fs/namei.c:4175 [inline]
__x64_sys_symlink+0x59/0x80 fs/namei.c:4175
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880a284cd80
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 12 bytes inside of
32-byte region [ffff8880a284cd80, ffff8880a284cda0)
The buggy address belongs to the page:
page:ffffea00028a1300 refcount:1 mapcount:0 mapping:ffff8880aa4001c0
index:0xffff8880a284cfc1
raw: 00fffe0000000200 ffffea00025a5ac8 ffffea0002a010c8 ffff8880aa4001c0
raw: ffff8880a284cfc1 ffff8880a284c000 0000000100000037 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a284cc80: 06 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc
ffff8880a284cd00: 06 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
> ffff8880a284cd80: 00 04 fc fc fc fc fc fc 06 fc fc fc fc fc fc fc
^
ffff8880a284ce00: 06 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc
ffff8880a284ce80: 06 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
---
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 syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: 2187f215 Merge tag 'for-5.5-rc2-tag' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16b0f2fee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=ab2ae0615387ef78
dashboard link: https://syzkaller.appspot.com/bug?extid=c37a14770d51a085a520
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c37a14...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:380 [inline]
BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49
[inline]
BUG: KASAN: slab-out-of-bounds in vc_do_resize+0x959/0x1460
drivers/tty/vt/vt.c:1250
Read of size 2 at addr ffff8880a284cd8c by task syz-executor.0/13609
CPU: 1 PID: 13609 Comm: syz-executor.0 Not tainted 5.5.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
__kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
kasan_report+0x12/0x20 mm/kasan/common.c:639
check_memory_region_inline mm/kasan/generic.c:185 [inline]
check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
memcpy+0x24/0x50 mm/kasan/common.c:125
memcpy include/linux/string.h:380 [inline]
scr_memcpyw include/linux/vt_buffer.h:49 [inline]
vc_do_resize+0x959/0x1460 drivers/tty/vt/vt.c:1250
vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304
fbcon_modechanged+0x367/0x790 drivers/video/fbdev/core/fbcon.c:2980
fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3038
fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1051
do_fb_ioctl+0x390/0x7d0 drivers/video/fbdev/core/fbmem.c:1104
fb_ioctl+0xe6/0x130 drivers/video/fbdev/core/fbmem.c:1180
vfs_ioctl fs/ioctl.c:47 [inline]
file_ioctl fs/ioctl.c:545 [inline]
do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
__do_sys_ioctl fs/ioctl.c:756 [inline]
__se_sys_ioctl fs/ioctl.c:754 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a919
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe4a3fd6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe4a3fd76d4
R13: 00000000004c310d R14: 00000000004d8478 R15: 00000000ffffffff
Allocated by task 13609:
save_stack+0x23/0x90 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
__kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
__do_kmalloc mm/slab.c:3656 [inline]
__kmalloc+0x163/0x770 mm/slab.c:3665
kmalloc include/linux/slab.h:561 [inline]
kzalloc include/linux/slab.h:670 [inline]
vc_do_resize+0x262/0x1460 drivers/tty/vt/vt.c:1187
vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304
fbcon_modechanged+0x367/0x790 drivers/video/fbdev/core/fbcon.c:2980
fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3038
fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1051
fbcon_resize+0x6b1/0x780 drivers/video/fbdev/core/fbcon.c:2222
resize_screen drivers/tty/vt/vt.c:1126 [inline]
vc_do_resize+0x440/0x1460 drivers/tty/vt/vt.c:1205
vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304
fbcon_modechanged+0x367/0x790 drivers/video/fbdev/core/fbcon.c:2980
fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3038
fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1051
do_fb_ioctl+0x390/0x7d0 drivers/video/fbdev/core/fbmem.c:1104
fb_ioctl+0xe6/0x130 drivers/video/fbdev/core/fbmem.c:1180
vfs_ioctl fs/ioctl.c:47 [inline]
file_ioctl fs/ioctl.c:545 [inline]
do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
__do_sys_ioctl fs/ioctl.c:756 [inline]
__se_sys_ioctl fs/ioctl.c:754 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 13273:
save_stack+0x23/0x90 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:335 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
__cache_free mm/slab.c:3426 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3757
tomoyo_path_perm+0x389/0x430 security/tomoyo/file.c:840
tomoyo_path_symlink+0xaa/0xf0 security/tomoyo/tomoyo.c:206
security_path_symlink+0x10a/0x170 security/security.c:1053
do_symlinkat+0x137/0x290 fs/namei.c:4156
__do_sys_symlink fs/namei.c:4177 [inline]
__se_sys_symlink fs/namei.c:4175 [inline]
__x64_sys_symlink+0x59/0x80 fs/namei.c:4175
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880a284cd80
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 12 bytes inside of
32-byte region [ffff8880a284cd80, ffff8880a284cda0)
The buggy address belongs to the page:
page:ffffea00028a1300 refcount:1 mapcount:0 mapping:ffff8880aa4001c0
index:0xffff8880a284cfc1
raw: 00fffe0000000200 ffffea00025a5ac8 ffffea0002a010c8 ffff8880aa4001c0
raw: ffff8880a284cfc1 ffff8880a284c000 0000000100000037 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a284cc80: 06 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc
ffff8880a284cd00: 06 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
> ffff8880a284cd80: 00 04 fc fc fc fc fc fc 06 fc fc fc fc fc fc fc
^
ffff8880a284ce00: 06 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc
ffff8880a284ce80: 06 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
---
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 syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Jan 21, 2020, 9:46:10 PM1/21/20
to daniel...@ffwll.ch, gha...@redhat.com, gre...@linuxfoundation.org, jsl...@suse.com, linux-...@vger.kernel.org, ni...@fluxnic.net, okash....@gmail.com, olek...@redhat.com, s...@ravnborg.org, syzkall...@googlegroups.com, text...@uchuujin.de
syzbot has found a reproducer for the following crash on:
HEAD commit: d96d875e Merge tag 'fixes_for_v5.5-rc8' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13ae7369e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=cf8e288883e40aba
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c37a14...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:380 [inline]
BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49 [inline]
BUG: KASAN: slab-out-of-bounds in vc_do_resize+0x959/0x1460 drivers/tty/vt/vt.c:1250
Read of size 192 at addr ffff8880a3f85940 by task syz-executor.0/9662
CPU: 0 PID: 9662 Comm: syz-executor.0 Not tainted 5.5.0-rc7-syzkaller #0
RIP: 0033:0x45b349
RAX: ffffffffffffffda RBX: 00007f8865c736d4 RCX: 000000000045b349
R13: 00000000000002cd R14: 00000000004c3dc6 R15: 000000000075bf2c
Allocated by task 9662:
Freed by task 9469:
skb_release_data+0x551/0x8d0 net/core/skbuff.c:611
skb_release_all+0x4d/0x60 net/core/skbuff.c:665
__kfree_skb net/core/skbuff.c:679 [inline]
consume_skb net/core/skbuff.c:838 [inline]
consume_skb+0xfb/0x410 net/core/skbuff.c:832
unix_stream_read_generic+0x18ec/0x1de0 net/unix/af_unix.c:2363
unix_stream_recvmsg+0xc3/0x100 net/unix/af_unix.c:2421
sock_recvmsg_nosec net/socket.c:873 [inline]
sock_recvmsg net/socket.c:891 [inline]
sock_recvmsg+0xce/0x110 net/socket.c:887
sock_read_iter+0x2f8/0x420 net/socket.c:969
call_read_iter include/linux/fs.h:1896 [inline]
new_sync_read+0x680/0x800 fs/read_write.c:414
__vfs_read+0xe1/0x110 fs/read_write.c:427
vfs_read+0x1f0/0x440 fs/read_write.c:461
ksys_read+0x220/0x290 fs/read_write.c:587
__do_sys_read fs/read_write.c:597 [inline]
__se_sys_read fs/read_write.c:595 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:595
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880a3f85800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 320 bytes inside of
512-byte region [ffff8880a3f85800, ffff8880a3f85a00)
raw: 00fffe0000000200 ffffea00029f71c8 ffffea00029463c8 ffff8880aa400a80
raw: 0000000000000000 ffff8880a3f85000 0000000100000004 0000000000000000
ffff8880a3f85900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a3f85980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8880a3f85a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880a3f85a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
HEAD commit: d96d875e Merge tag 'fixes_for_v5.5-rc8' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13ae7369e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=cf8e288883e40aba
dashboard link: https://syzkaller.appspot.com/bug?extid=c37a14770d51a085a520
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16ab6bd1e00000
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c37a14...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:380 [inline]
BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49 [inline]
BUG: KASAN: slab-out-of-bounds in vc_do_resize+0x959/0x1460 drivers/tty/vt/vt.c:1250
CPU: 0 PID: 9662 Comm: syz-executor.0 Not tainted 5.5.0-rc7-syzkaller #0
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8865c72c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8865c736d4 RCX: 000000000045b349
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R13: 00000000000002cd R14: 00000000004c3dc6 R15: 000000000075bf2c
Allocated by task 9662:
save_stack+0x23/0x90 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:335 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
__cache_free mm/slab.c:3426 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3757
skb_free_head+0x93/0xb0 net/core/skbuff.c:591
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:335 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
__cache_free mm/slab.c:3426 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3757
skb_release_data+0x551/0x8d0 net/core/skbuff.c:611
skb_release_all+0x4d/0x60 net/core/skbuff.c:665
__kfree_skb net/core/skbuff.c:679 [inline]
consume_skb net/core/skbuff.c:838 [inline]
consume_skb+0xfb/0x410 net/core/skbuff.c:832
unix_stream_read_generic+0x18ec/0x1de0 net/unix/af_unix.c:2363
unix_stream_recvmsg+0xc3/0x100 net/unix/af_unix.c:2421
sock_recvmsg_nosec net/socket.c:873 [inline]
sock_recvmsg net/socket.c:891 [inline]
sock_recvmsg+0xce/0x110 net/socket.c:887
sock_read_iter+0x2f8/0x420 net/socket.c:969
call_read_iter include/linux/fs.h:1896 [inline]
new_sync_read+0x680/0x800 fs/read_write.c:414
__vfs_read+0xe1/0x110 fs/read_write.c:427
vfs_read+0x1f0/0x440 fs/read_write.c:461
ksys_read+0x220/0x290 fs/read_write.c:587
__do_sys_read fs/read_write.c:597 [inline]
__se_sys_read fs/read_write.c:595 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:595
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880a3f85800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 320 bytes inside of
512-byte region [ffff8880a3f85800, ffff8880a3f85a00)
The buggy address belongs to the page:
page:ffffea00028fe140 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0
raw: 00fffe0000000200 ffffea00029f71c8 ffffea00029463c8 ffff8880aa400a80
raw: 0000000000000000 ffff8880a3f85000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a3f85880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Memory state around the buggy address:
ffff8880a3f85900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a3f85980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8880a3f85a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880a3f85a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
syzbot
Jan 22, 2020, 10:51:09 AM1/22/20
to b.zoln...@samsung.com, daniel...@ffwll.ch, gha...@redhat.com, gre...@linuxfoundation.org, jsl...@suse.com, linux-...@vger.kernel.org, ni...@fluxnic.net, okash....@gmail.com, olek...@redhat.com, s...@ravnborg.org, syzkall...@googlegroups.com, text...@uchuujin.de
syzbot has found a reproducer for the following crash on:
HEAD commit: d96d875e Merge tag 'fixes_for_v5.5-rc8' of git://git.kerne..
git tree: upstream
HEAD commit: d96d875e Merge tag 'fixes_for_v5.5-rc8' of git://git.kerne..
console output: https://syzkaller.appspot.com/x/log.txt?x=11554d85e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=83c00afca9cf5153
dashboard link: https://syzkaller.appspot.com/bug?extid=c37a14770d51a085a520
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1659a721e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16aa59c9e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c37a14...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49 [inline]
BUG: KASAN: slab-out-of-bounds in vc_do_resize+0xb5e/0x1af0 drivers/tty/vt/vt.c:1250
Read of size 192 at addr ffff888095d34540 by task syz-executor536/9034
CPU: 1 PID: 9034 Comm: syz-executor536 Not tainted 5.5.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fb/0x318 lib/dump_stack.c:118
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
print_address_description+0x74/0x5c0 mm/kasan/report.c:374
__kasan_report+0x149/0x1c0 mm/kasan/report.c:506
kasan_report+0x26/0x50 mm/kasan/common.c:639
check_memory_region_inline mm/kasan/generic.c:182 [inline]
check_memory_region+0x2b6/0x2f0 mm/kasan/generic.c:192
memcpy+0x28/0x60 mm/kasan/common.c:125
scr_memcpyw include/linux/vt_buffer.h:49 [inline]
vc_do_resize+0xb5e/0x1af0 drivers/tty/vt/vt.c:1250
vc_resize+0x4f/0x60 drivers/tty/vt/vt.c:1304
fbcon_modechanged+0x701/0xdf0 drivers/video/fbdev/core/fbcon.c:2980
fbcon_update_vcs+0x31/0x40 drivers/video/fbdev/core/fbcon.c:3038
fb_set_var+0x8f5/0xdc0 drivers/video/fbdev/core/fbmem.c:1051
do_fb_ioctl+0x55e/0x780 drivers/video/fbdev/core/fbmem.c:1104
fb_ioctl+0xb9/0xf0 drivers/video/fbdev/core/fbmem.c:1180
do_vfs_ioctl+0x6e2/0x19b0 fs/ioctl.c:47
ksys_ioctl fs/ioctl.c:749 [inline]
__do_sys_ioctl fs/ioctl.c:756 [inline]
__se_sys_ioctl fs/ioctl.c:754 [inline]
__x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:754
__se_sys_ioctl fs/ioctl.c:754 [inline]
do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446d49
Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc010171db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 0000000000446d49
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000004
RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c
R13: 00007ffc8ab7313f R14: 00007fc0101729c0 R15: 0000000000000001
Allocated by task 9034:
save_stack mm/kasan/common.c:72 [inline]
set_track mm/kasan/common.c:80 [inline]
__kasan_kmalloc+0x118/0x1c0 mm/kasan/common.c:513
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
__do_kmalloc mm/slab.c:3656 [inline]
__kmalloc+0x254/0x340 mm/slab.c:3665
__do_kmalloc mm/slab.c:3656 [inline]
kmalloc include/linux/slab.h:561 [inline]
kzalloc+0x21/0x40 include/linux/slab.h:670
vc_do_resize+0x2af/0x1af0 drivers/tty/vt/vt.c:1187
vc_resize+0x4f/0x60 drivers/tty/vt/vt.c:1304
fbcon_modechanged+0x701/0xdf0 drivers/video/fbdev/core/fbcon.c:2980
fbcon_update_vcs+0x31/0x40 drivers/video/fbdev/core/fbcon.c:3038
fb_set_var+0x8f5/0xdc0 drivers/video/fbdev/core/fbmem.c:1051
fbcon_resize+0x819/0x11f0 drivers/video/fbdev/core/fbcon.c:2222
resize_screen drivers/tty/vt/vt.c:1126 [inline]
vc_do_resize+0x478/0x1af0 drivers/tty/vt/vt.c:1205
vc_resize+0x4f/0x60 drivers/tty/vt/vt.c:1304
fbcon_modechanged+0x701/0xdf0 drivers/video/fbdev/core/fbcon.c:2980
fbcon_update_vcs+0x31/0x40 drivers/video/fbdev/core/fbcon.c:3038
fb_set_var+0x8f5/0xdc0 drivers/video/fbdev/core/fbmem.c:1051
do_fb_ioctl+0x55e/0x780 drivers/video/fbdev/core/fbmem.c:1104
fb_ioctl+0xb9/0xf0 drivers/video/fbdev/core/fbmem.c:1180
do_vfs_ioctl+0x6e2/0x19b0 fs/ioctl.c:47
ksys_ioctl fs/ioctl.c:749 [inline]
__do_sys_ioctl fs/ioctl.c:756 [inline]
__se_sys_ioctl fs/ioctl.c:754 [inline]
__x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:754
__se_sys_ioctl fs/ioctl.c:754 [inline]
do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 8579:
save_stack mm/kasan/common.c:72 [inline]
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:335 [inline]
__kasan_slab_free+0x12e/0x1e0 mm/kasan/common.c:474
kasan_set_free_info mm/kasan/common.c:335 [inline]
kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
__cache_free mm/slab.c:3426 [inline]
kfree+0x10d/0x220 mm/slab.c:3757
__cache_free mm/slab.c:3426 [inline]
load_elf_binary+0x2c82/0x36d0 fs/binfmt_elf.c:1085
search_binary_handler+0x190/0x5e0 fs/exec.c:1658
exec_binprm fs/exec.c:1701 [inline]
__do_execve_file+0x1565/0x1cc0 fs/exec.c:1821
do_execveat_common fs/exec.c:1867 [inline]
do_execve fs/exec.c:1884 [inline]
__do_sys_execve fs/exec.c:1960 [inline]
__se_sys_execve fs/exec.c:1955 [inline]
__x64_sys_execve+0x94/0xb0 fs/exec.c:1955
do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff888095d34400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 320 bytes inside of
512-byte region [ffff888095d34400, ffff888095d34600)
The buggy address is located 320 bytes inside of
The buggy address belongs to the page:
page:ffffea0002574d00 refcount:1 mapcount:0 mapping:ffff8880aa800a80 index:0x0
raw: 00fffe0000000200 ffffea0002741f88 ffffea0002846a48 ffff8880aa800a80
raw: 0000000000000000 ffff888095d34000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888095d34480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Memory state around the buggy address:
ffff888095d34500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888095d34580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888095d34600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888095d34680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
syzbot
Jan 26, 2020, 6:26:02 AM1/26/20
to b.zoln...@samsung.com, daniel....@linaro.org, daniel...@ffwll.ch, daniel...@intel.com, gha...@redhat.com, gre...@linuxfoundation.org, jsl...@suse.com, linux-...@vger.kernel.org, maarten....@linux.intel.com, ni...@fluxnic.net, okash....@gmail.com, olek...@redhat.com, s...@ravnborg.org, syzkall...@googlegroups.com, text...@uchuujin.de
syzbot has bisected this bug to:
commit 9e1467002630065ed86c65ea28bfc9194fff6f0e
Author: Daniel Vetter <daniel...@ffwll.ch>
Date: Tue May 28 09:02:59 2019 +0000
fbcon: replace FB_EVENT_MODE_CHANGE/_ALL with direct calls
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=135a779ee00000
start commit: d96d875e Merge tag 'fixes_for_v5.5-rc8' of git://git.kerne..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=10da779ee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=175a779ee00000
Fixes: 9e1467002630 ("fbcon: replace FB_EVENT_MODE_CHANGE/_ALL with direct calls")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit 9e1467002630065ed86c65ea28bfc9194fff6f0e
Author: Daniel Vetter <daniel...@ffwll.ch>
Date: Tue May 28 09:02:59 2019 +0000
fbcon: replace FB_EVENT_MODE_CHANGE/_ALL with direct calls
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=135a779ee00000
start commit: d96d875e Merge tag 'fixes_for_v5.5-rc8' of git://git.kerne..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=10da779ee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=175a779ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=83c00afca9cf5153
dashboard link: https://syzkaller.appspot.com/bug?extid=c37a14770d51a085a520
dashboard link: https://syzkaller.appspot.com/bug?extid=c37a14770d51a085a520
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1659a721e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16aa59c9e00000
Reported-by: syzbot+c37a14...@syzkaller.appspotmail.com
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16aa59c9e00000
Fixes: 9e1467002630 ("fbcon: replace FB_EVENT_MODE_CHANGE/_ALL with direct calls")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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