[syzbot] KASAN: use-after-free Read in exit_mmap

From: syzbot
Date: Wed Jul 27 2022 - 10:11:40 EST

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Hello,

syzbot found the following issue on:

HEAD commit: cb71b93c2dc3 Add linux-next specific files for 20220628
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=16c0a5ba080000
kernel config: https://syzkaller.appspot.com/x/.config?x=badbc1adb2d582eb
dashboard link: https://syzkaller.appspot.com/bug?extid=99551d8b4d180f6cb1c0
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=117dc816080000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12695b26080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+99551d8b4d180f6cb1c0@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: use-after-free in exit_mmap+0x6b1/0x720 mm/mmap.c:3220
Read of size 8 at addr ffff88801fa79cc8 by task syz-executor422/3601

CPU: 0 PID: 3601 Comm: syz-executor422 Not tainted 5.19.0-rc4-next-20220628-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:317 [inline]
print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
kasan_report+0xbe/0x1f0 mm/kasan/report.c:495
exit_mmap+0x6b1/0x720 mm/mmap.c:3220
__mmput+0x128/0x4c0 kernel/fork.c:1180
mmput+0x5c/0x70 kernel/fork.c:1201
exit_mm kernel/exit.c:510 [inline]
do_exit+0xa09/0x29f0 kernel/exit.c:782
do_group_exit+0xd2/0x2f0 kernel/exit.c:925
__do_sys_exit_group kernel/exit.c:936 [inline]
__se_sys_exit_group kernel/exit.c:934 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f39b4e776a9
Code: Unable to access opcode bytes at RIP 0x7f39b4e7767f.
RSP: 002b:00007ffe5f9ced98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f39b4eeb270 RCX: 00007f39b4e776a9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f39b4eeb270
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
</TASK>

Allocated by task 3601:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
__kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:736 [inline]
slab_alloc_node mm/slub.c:3243 [inline]
slab_alloc mm/slub.c:3251 [inline]
__kmem_cache_alloc_lru mm/slub.c:3258 [inline]
kmem_cache_alloc+0x2d6/0x4c0 mm/slub.c:3268
vm_area_alloc+0x1c/0xf0 kernel/fork.c:458
mmap_region+0x448/0x1bf0 mm/mmap.c:2667
do_mmap+0x825/0xf50 mm/mmap.c:1483
vm_mmap_pgoff+0x1ab/0x270 mm/util.c:520
ksys_mmap_pgoff+0x79/0x5a0 mm/mmap.c:1529
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0

Freed by task 3601:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1754 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780
slab_free mm/slub.c:3534 [inline]
kmem_cache_free+0xeb/0x5b0 mm/slub.c:3551
exit_mmap+0x288/0x720 mm/mmap.c:3222
__mmput+0x128/0x4c0 kernel/fork.c:1180
mmput+0x5c/0x70 kernel/fork.c:1201
exit_mm kernel/exit.c:510 [inline]
do_exit+0xa09/0x29f0 kernel/exit.c:782
do_group_exit+0xd2/0x2f0 kernel/exit.c:925
__do_sys_exit_group kernel/exit.c:936 [inline]
__se_sys_exit_group kernel/exit.c:934 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0

The buggy address belongs to the object at ffff88801fa79ca8
which belongs to the cache vm_area_struct of size 152
The buggy address is located 32 bytes inside of
152-byte region [ffff88801fa79ca8, ffff88801fa79d40)

The buggy address belongs to the physical page:
page:ffffea00007e9e40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fa79
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888140006b40
raw: 0000000000000000 0000000080120012 00000001ffffffff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 3596, tgid 3596 (sshd), ts 49436343226, free_ts 44111523441
prep_new_page mm/page_alloc.c:2535 [inline]
get_page_from_freelist+0x210d/0x3a30 mm/page_alloc.c:4282
__alloc_pages+0x1c7/0x510 mm/page_alloc.c:5506
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2280
alloc_slab_page mm/slub.c:1824 [inline]
allocate_slab+0x27e/0x3d0 mm/slub.c:1969
new_slab mm/slub.c:2029 [inline]
___slab_alloc+0x89d/0xef0 mm/slub.c:3031
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
slab_alloc_node mm/slub.c:3209 [inline]
slab_alloc mm/slub.c:3251 [inline]
__kmem_cache_alloc_lru mm/slub.c:3258 [inline]
kmem_cache_alloc+0x3fb/0x4c0 mm/slub.c:3268
vm_area_dup+0x81/0x380 kernel/fork.c:466
dup_mmap+0x642/0x1070 kernel/fork.c:640
dup_mm+0x91/0x370 kernel/fork.c:1520
copy_mm kernel/fork.c:1569 [inline]
copy_process+0x3ca8/0x7080 kernel/fork.c:2237
kernel_clone+0xe7/0xab0 kernel/fork.c:2652
__do_sys_clone+0xba/0x100 kernel/fork.c:2786
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1453 [inline]
free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1503
free_unref_page_prepare mm/page_alloc.c:3383 [inline]
free_unref_page_list+0x16f/0xb90 mm/page_alloc.c:3525
release_pages+0xbe8/0x1810 mm/swap.c:1017
tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:58
tlb_flush_mmu_free mm/mmu_gather.c:255 [inline]
tlb_flush_mmu mm/mmu_gather.c:262 [inline]
tlb_finish_mmu+0x147/0x7e0 mm/mmu_gather.c:353
exit_mmap+0x1fe/0x720 mm/mmap.c:3212
__mmput+0x128/0x4c0 kernel/fork.c:1180
mmput+0x5c/0x70 kernel/fork.c:1201
exit_mm kernel/exit.c:510 [inline]
do_exit+0xa09/0x29f0 kernel/exit.c:782
do_group_exit+0xd2/0x2f0 kernel/exit.c:925
__do_sys_exit_group kernel/exit.c:936 [inline]
__se_sys_exit_group kernel/exit.c:934 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0

Memory state around the buggy address:
ffff88801fa79b80: 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb
ffff88801fa79c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
>ffff88801fa79c80: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
^
ffff88801fa79d00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88801fa79d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

---
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Next message: Vlastimil Babka: "Re: [PATCH v3 1/3] mm/slub: enable debugging memory wasting of kmalloc"
Previous message: syzbot: "[syzbot] KASAN: use-after-free Read in __post_watch_notification"
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