[syzbot] [perf?] KASAN: slab-use-after-free Read in filter_chain

From: syzbot
Date: Mon Jul 15 2024 - 14:52:32 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 528dd46d0fc3 Merge tag 'net-6.10-rc8-2' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1168bc2d980000
kernel config: https://syzkaller.appspot.com/x/.config?x=3456bae478301dc8
dashboard link: https://syzkaller.appspot.com/bug?extid=772df6edd4e13e9e9bc5
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-528dd46d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e282f55fdf5f/vmlinux-528dd46d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/824cfb5d5809/bzImage-528dd46d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+772df6edd4e13e9e9bc5@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: slab-use-after-free in consumer_filter kernel/events/uprobes.c:869 [inline]
BUG: KASAN: slab-use-after-free in filter_chain+0xf6/0x110 kernel/events/uprobes.c:880
Read of size 8 at addr ffff88801a2b85b0 by task syz.1.1633/10836

CPU: 0 PID: 10836 Comm: syz.1.1633 Not tainted 6.10.0-rc7-syzkaller-00254-g528dd46d0fc3 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0xc3/0x620 mm/kasan/report.c:488
kasan_report+0xd9/0x110 mm/kasan/report.c:601
consumer_filter kernel/events/uprobes.c:869 [inline]
filter_chain+0xf6/0x110 kernel/events/uprobes.c:880
uprobe_mmap+0x46b/0x1240 kernel/events/uprobes.c:1387
mmap_region+0x1228/0x2760 mm/mmap.c:2987
do_mmap+0xbc7/0xf60 mm/mmap.c:1397
vm_mmap_pgoff+0x1ba/0x360 mm/util.c:573
ksys_mmap_pgoff+0x332/0x5d0 mm/mmap.c:1443
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:79 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:79
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb371d75bd9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb3717ff048 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fb371f03f60 RCX: 00007fb371d75bd9
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020000000
RBP: 00007fb371de4e60 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb371f03f60 R15: 00007ffc20b151a8
</TASK>

Allocated by task 5195:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kmalloc_node_noprof include/linux/slab.h:677 [inline]
__get_vm_area_node+0xe1/0x2d0 mm/vmalloc.c:3108
__vmalloc_node_range_noprof+0x276/0x1520 mm/vmalloc.c:3800
__vmalloc_node_noprof mm/vmalloc.c:3905 [inline]
vzalloc_noprof+0x6b/0x90 mm/vmalloc.c:3978
alloc_counters net/ipv6/netfilter/ip6_tables.c:815 [inline]
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+0x6ba/0xaf0 net/ipv6/netfilter/ip6_tables.c:1677
nf_getsockopt+0x79/0xe0 net/netfilter/nf_sockopt.c:116
ipv6_getsockopt+0x1fd/0x2c0 net/ipv6/ipv6_sockglue.c:1494
tcp_getsockopt+0x9e/0x100 net/ipv4/tcp.c:4406
do_sock_getsockopt+0x2e5/0x760 net/socket.c:2374
__sys_getsockopt+0x1a1/0x270 net/socket.c:2403
__do_sys_getsockopt net/socket.c:2413 [inline]
__se_sys_getsockopt net/socket.c:2410 [inline]
__x64_sys_getsockopt+0xbd/0x160 net/socket.c:2410
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5195:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
poison_slab_object+0xf7/0x160 mm/kasan/common.c:240
__kasan_slab_free+0x32/0x50 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2196 [inline]
slab_free mm/slub.c:4438 [inline]
kfree+0x12a/0x3b0 mm/slub.c:4559
vfree+0x25a/0x7a0 mm/vmalloc.c:3368
copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:882 [inline]
get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline]
do_ip6t_get_ctl+0x8ec/0xaf0 net/ipv6/netfilter/ip6_tables.c:1677
nf_getsockopt+0x79/0xe0 net/netfilter/nf_sockopt.c:116
ipv6_getsockopt+0x1fd/0x2c0 net/ipv6/ipv6_sockglue.c:1494
tcp_getsockopt+0x9e/0x100 net/ipv4/tcp.c:4406
do_sock_getsockopt+0x2e5/0x760 net/socket.c:2374
__sys_getsockopt+0x1a1/0x270 net/socket.c:2403
__do_sys_getsockopt net/socket.c:2413 [inline]
__se_sys_getsockopt net/socket.c:2410 [inline]
__x64_sys_getsockopt+0xbd/0x160 net/socket.c:2410
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88801a2b8580
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 48 bytes inside of
freed 64-byte region [ffff88801a2b8580, ffff88801a2b85c0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801a2b8100 pfn:0x1a2b8
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 00fff00000000200 ffff8880154428c0 ffffea000082fd90 ffffea0000b53010
raw: ffff88801a2b8100 000000000020001e 00000001ffffefff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 5044052246, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1473
prep_new_page mm/page_alloc.c:1481 [inline]
get_page_from_freelist+0x1353/0x2e50 mm/page_alloc.c:3425
__alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4683
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x56/0x110 mm/slub.c:2265
allocate_slab mm/slub.c:2428 [inline]
new_slab+0x84/0x260 mm/slub.c:2481
___slab_alloc+0xdac/0x1870 mm/slub.c:3667
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757
__slab_alloc_node mm/slub.c:3810 [inline]
slab_alloc_node mm/slub.c:3990 [inline]
kmalloc_trace_noprof+0x2b4/0x300 mm/slub.c:4149
kmalloc_noprof include/linux/slab.h:660 [inline]
get_sparsemem_vmemmap_info fs/proc/kcore.c:164 [inline]
kclist_add_private+0x7bb/0xd40 fs/proc/kcore.c:222
walk_system_ram_range+0x132/0x1e0 kernel/resource.c:524
kcore_ram_list fs/proc/kcore.c:248 [inline]
kcore_update_ram.isra.0+0x310/0x980 fs/proc/kcore.c:268
proc_kcore_init+0x212/0x270 fs/proc/kcore.c:703
do_one_initcall+0x128/0x700 init/main.c:1267
do_initcall_level init/main.c:1329 [inline]
do_initcalls init/main.c:1345 [inline]
do_basic_setup init/main.c:1364 [inline]
kernel_init_freeable+0x69d/0xca0 init/main.c:1578
kernel_init+0x1c/0x2b0 init/main.c:1467
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
page_owner free stack trace missing

Memory state around the buggy address:
ffff88801a2b8480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff88801a2b8500: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff88801a2b8580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff88801a2b8600: 00 00 00 00 00 00 07 fc fc fc fc fc fc fc fc fc
ffff88801a2b8680: 00 00 00 00 00 00 07 fc fc fc fc fc fc fc fc fc
==================================================================

---
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Next message: Aleksandr Nogikh: "Re: [syzbot] WARNING in unmap_page_range (3)"
Previous message: Steven Rostedt: "[PATCH] tracing: Update MAINTAINERS file"
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