[moderation] [kernel?] KASAN: slab-use-after-free Read in kill_orphaned_pgrp (2)
0 views
Skip to first unread message
syzbot
Apr 11, 2024, 12:22:21 AMApr 11
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 480e035fc4c7 Merge tag 'drm-next-2024-03-13' of https://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13724ebd180000
kernel config: https://syzkaller.appspot.com/x/.config?x=1e5b814e91787669
dashboard link: https://syzkaller.appspot.com/bug?extid=6aeb66f093d46203352f
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
CC: [linux-...@vger.kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5f73b6ef963d/disk-480e035f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/46c949396aad/vmlinux-480e035f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e3b4d0f5a5f8/bzImage-480e035f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6aeb66...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in task_pgrp include/linux/sched/signal.h:689 [inline]
BUG: KASAN: slab-use-after-free in kill_orphaned_pgrp+0x41/0x560 kernel/exit.c:379
Read of size 8 at addr ffff88806d900908 by task vhost-20422/20423
CPU: 1 PID: 20423 Comm: vhost-20422 Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
task_pgrp include/linux/sched/signal.h:689 [inline]
kill_orphaned_pgrp+0x41/0x560 kernel/exit.c:379
exit_notify kernel/exit.c:739 [inline]
do_exit+0x1673/0x27e0 kernel/exit.c:898
vhost_task_fn+0x2ff/0x320 kernel/vhost_task.c:61
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
</TASK>
Allocated by task 8221:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:312 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3798 [inline]
slab_alloc_node mm/slub.c:3845 [inline]
kmem_cache_alloc_node+0x194/0x380 mm/slub.c:3888
alloc_task_struct_node kernel/fork.c:176 [inline]
dup_task_struct+0x57/0x7d0 kernel/fork.c:1106
copy_process+0x5d1/0x3df0 kernel/fork.c:2219
kernel_clone+0x21e/0x8d0 kernel/fork.c:2796
__do_sys_clone kernel/fork.c:2939 [inline]
__se_sys_clone kernel/fork.c:2923 [inline]
__x64_sys_clone+0x258/0x2a0 kernel/fork.c:2923
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
Freed by task 8221:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2106 [inline]
slab_free mm/slub.c:4280 [inline]
kmem_cache_free+0x102/0x2b0 mm/slub.c:4344
put_task_struct include/linux/sched/task.h:138 [inline]
delayed_put_task_struct+0x115/0x2d0 kernel/exit.c:229
rcu_do_batch kernel/rcu/tree.c:2196 [inline]
rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2471
__do_softirq+0x2bc/0x943 kernel/softirq.c:554
Last potentially related work creation:
kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
__kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541
__call_rcu_common kernel/rcu/tree.c:2734 [inline]
call_rcu+0x167/0xa70 kernel/rcu/tree.c:2838
release_task+0x16d2/0x1810
de_thread fs/exec.c:1171 [inline]
begin_new_exec+0xfde/0x1ce0 fs/exec.c:1277
load_elf_binary+0x961/0x2590 fs/binfmt_elf.c:996
search_binary_handler fs/exec.c:1777 [inline]
exec_binprm fs/exec.c:1819 [inline]
bprm_execve+0xaf8/0x1790 fs/exec.c:1871
do_execveat_common+0x553/0x700 fs/exec.c:1978
do_execveat fs/exec.c:2063 [inline]
__do_sys_execveat fs/exec.c:2137 [inline]
__se_sys_execveat fs/exec.c:2131 [inline]
__x64_sys_execveat+0xc4/0xe0 fs/exec.c:2131
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
The buggy address belongs to the object at ffff88806d900000
which belongs to the cache task_struct of size 7424
The buggy address is located 2312 bytes inside of
freed 7424-byte region [ffff88806d900000, ffff88806d901d00)
The buggy address belongs to the physical page:
page:ffffea0001b64000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6d900
head:ffffea0001b64000 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88806511d501
anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888015aec500 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88806511d501
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 10222, tgid 10222 (syz-executor.4), ts 236303838083, free_ts 236154460068
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
__alloc_pages+0x256/0x680 mm/page_alloc.c:4569
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page+0x5f/0x160 mm/slub.c:2175
allocate_slab mm/slub.c:2338 [inline]
new_slab+0x84/0x2f0 mm/slub.c:2391
___slab_alloc+0xc73/0x1260 mm/slub.c:3525
__slab_alloc mm/slub.c:3610 [inline]
__slab_alloc_node mm/slub.c:3663 [inline]
slab_alloc_node mm/slub.c:3835 [inline]
kmem_cache_alloc_node+0x24a/0x380 mm/slub.c:3888
alloc_task_struct_node kernel/fork.c:176 [inline]
dup_task_struct+0x57/0x7d0 kernel/fork.c:1106
copy_process+0x5d1/0x3df0 kernel/fork.c:2219
kernel_clone+0x21e/0x8d0 kernel/fork.c:2796
__do_sys_clone3 kernel/fork.c:3097 [inline]
__se_sys_clone3+0x2cb/0x350 kernel/fork.c:3081
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
page last free pid 8221 tgid 8221 stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1140 [inline]
free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346
free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486
discard_slab mm/slub.c:2437 [inline]
__put_partials+0xeb/0x130 mm/slub.c:2906
put_cpu_partial+0x17c/0x250 mm/slub.c:2981
__slab_free+0x2ea/0x3d0 mm/slub.c:4151
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3798 [inline]
slab_alloc_node mm/slub.c:3845 [inline]
kmem_cache_alloc_node+0x194/0x380 mm/slub.c:3888
alloc_vmap_area+0x1c5/0x1c10 mm/vmalloc.c:1675
__get_vm_area_node+0x16e/0x370 mm/vmalloc.c:2667
__vmalloc_node_range+0x3df/0x14a0 mm/vmalloc.c:3352
__vmalloc_node mm/vmalloc.c:3457 [inline]
vzalloc+0x79/0x90 mm/vmalloc.c:3530
alloc_counters+0xd7/0x770 net/ipv4/netfilter/arp_tables.c:660
copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline]
get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline]
do_ip6t_get_ctl+0xecc/0x1820 net/ipv6/netfilter/ip6_tables.c:1669
nf_getsockopt+0x299/0x2c0 net/netfilter/nf_sockopt.c:116
Memory state around the buggy address:
ffff88806d900800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806d900880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88806d900900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88806d900980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806d900a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 480e035fc4c7 Merge tag 'drm-next-2024-03-13' of https://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13724ebd180000
kernel config: https://syzkaller.appspot.com/x/.config?x=1e5b814e91787669
dashboard link: https://syzkaller.appspot.com/bug?extid=6aeb66f093d46203352f
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
CC: [linux-...@vger.kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5f73b6ef963d/disk-480e035f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/46c949396aad/vmlinux-480e035f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e3b4d0f5a5f8/bzImage-480e035f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6aeb66...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in task_pgrp include/linux/sched/signal.h:689 [inline]
BUG: KASAN: slab-use-after-free in kill_orphaned_pgrp+0x41/0x560 kernel/exit.c:379
Read of size 8 at addr ffff88806d900908 by task vhost-20422/20423
CPU: 1 PID: 20423 Comm: vhost-20422 Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
task_pgrp include/linux/sched/signal.h:689 [inline]
kill_orphaned_pgrp+0x41/0x560 kernel/exit.c:379
exit_notify kernel/exit.c:739 [inline]
do_exit+0x1673/0x27e0 kernel/exit.c:898
vhost_task_fn+0x2ff/0x320 kernel/vhost_task.c:61
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
</TASK>
Allocated by task 8221:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:312 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3798 [inline]
slab_alloc_node mm/slub.c:3845 [inline]
kmem_cache_alloc_node+0x194/0x380 mm/slub.c:3888
alloc_task_struct_node kernel/fork.c:176 [inline]
dup_task_struct+0x57/0x7d0 kernel/fork.c:1106
copy_process+0x5d1/0x3df0 kernel/fork.c:2219
kernel_clone+0x21e/0x8d0 kernel/fork.c:2796
__do_sys_clone kernel/fork.c:2939 [inline]
__se_sys_clone kernel/fork.c:2923 [inline]
__x64_sys_clone+0x258/0x2a0 kernel/fork.c:2923
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
Freed by task 8221:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2106 [inline]
slab_free mm/slub.c:4280 [inline]
kmem_cache_free+0x102/0x2b0 mm/slub.c:4344
put_task_struct include/linux/sched/task.h:138 [inline]
delayed_put_task_struct+0x115/0x2d0 kernel/exit.c:229
rcu_do_batch kernel/rcu/tree.c:2196 [inline]
rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2471
__do_softirq+0x2bc/0x943 kernel/softirq.c:554
Last potentially related work creation:
kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
__kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541
__call_rcu_common kernel/rcu/tree.c:2734 [inline]
call_rcu+0x167/0xa70 kernel/rcu/tree.c:2838
release_task+0x16d2/0x1810
de_thread fs/exec.c:1171 [inline]
begin_new_exec+0xfde/0x1ce0 fs/exec.c:1277
load_elf_binary+0x961/0x2590 fs/binfmt_elf.c:996
search_binary_handler fs/exec.c:1777 [inline]
exec_binprm fs/exec.c:1819 [inline]
bprm_execve+0xaf8/0x1790 fs/exec.c:1871
do_execveat_common+0x553/0x700 fs/exec.c:1978
do_execveat fs/exec.c:2063 [inline]
__do_sys_execveat fs/exec.c:2137 [inline]
__se_sys_execveat fs/exec.c:2131 [inline]
__x64_sys_execveat+0xc4/0xe0 fs/exec.c:2131
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
The buggy address belongs to the object at ffff88806d900000
which belongs to the cache task_struct of size 7424
The buggy address is located 2312 bytes inside of
freed 7424-byte region [ffff88806d900000, ffff88806d901d00)
The buggy address belongs to the physical page:
page:ffffea0001b64000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6d900
head:ffffea0001b64000 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88806511d501
anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888015aec500 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88806511d501
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 10222, tgid 10222 (syz-executor.4), ts 236303838083, free_ts 236154460068
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
__alloc_pages+0x256/0x680 mm/page_alloc.c:4569
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page+0x5f/0x160 mm/slub.c:2175
allocate_slab mm/slub.c:2338 [inline]
new_slab+0x84/0x2f0 mm/slub.c:2391
___slab_alloc+0xc73/0x1260 mm/slub.c:3525
__slab_alloc mm/slub.c:3610 [inline]
__slab_alloc_node mm/slub.c:3663 [inline]
slab_alloc_node mm/slub.c:3835 [inline]
kmem_cache_alloc_node+0x24a/0x380 mm/slub.c:3888
alloc_task_struct_node kernel/fork.c:176 [inline]
dup_task_struct+0x57/0x7d0 kernel/fork.c:1106
copy_process+0x5d1/0x3df0 kernel/fork.c:2219
kernel_clone+0x21e/0x8d0 kernel/fork.c:2796
__do_sys_clone3 kernel/fork.c:3097 [inline]
__se_sys_clone3+0x2cb/0x350 kernel/fork.c:3081
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
page last free pid 8221 tgid 8221 stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1140 [inline]
free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346
free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486
discard_slab mm/slub.c:2437 [inline]
__put_partials+0xeb/0x130 mm/slub.c:2906
put_cpu_partial+0x17c/0x250 mm/slub.c:2981
__slab_free+0x2ea/0x3d0 mm/slub.c:4151
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3798 [inline]
slab_alloc_node mm/slub.c:3845 [inline]
kmem_cache_alloc_node+0x194/0x380 mm/slub.c:3888
alloc_vmap_area+0x1c5/0x1c10 mm/vmalloc.c:1675
__get_vm_area_node+0x16e/0x370 mm/vmalloc.c:2667
__vmalloc_node_range+0x3df/0x14a0 mm/vmalloc.c:3352
__vmalloc_node mm/vmalloc.c:3457 [inline]
vzalloc+0x79/0x90 mm/vmalloc.c:3530
alloc_counters+0xd7/0x770 net/ipv4/netfilter/arp_tables.c:660
copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline]
get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline]
do_ip6t_get_ctl+0xecc/0x1820 net/ipv6/netfilter/ip6_tables.c:1669
nf_getsockopt+0x299/0x2c0 net/netfilter/nf_sockopt.c:116
Memory state around the buggy address:
ffff88806d900800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806d900880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88806d900900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88806d900980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806d900a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
Reply all
Reply to author
Forward
0 new messages