KASAN: use-after-free Read in ext4_group_desc

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
android-5-10	KASAN: slab-out-of-bounds Read in ext4_group_desc_csum ext4	C	error	inconclusive	11	536d	637d	2/2	fixed on 2023/06/13 08:16
android-54	KASAN: use-after-free Read in ext4_group_desc_csum				6	583d	637d	0/2	auto-obsoleted due to no activity on 2023/08/15 14:19
upstream	KASAN: slab-out-of-bounds Read in ext4_group_desc_csum ext4	C	error		26	557d	658d	22/28	fixed on 2023/07/01 16:05
android-5-15	KASAN: use-after-free Read in ext4_group_desc_csum ext4 origin:upstream	C	error		4	576d	646d	2/2	fixed on 2023/06/16 14:10

ext4 filesystem being mounted at /root/syzkaller-testdir298027843/syzkaller.VIH6zx/58/bus supports timestamps until 2038 (0x7fffffff) ================================================================== BUG: KASAN: use-after-free in crc16+0x1bc/0x270 lib/crc16.c:58 Read of size 1 at addr ffff88801a9f7000 by task syz-executor.4/5513 CPU: 1 PID: 5513 Comm: syz-executor.4 Not tainted 5.15.108-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 crc16+0x1bc/0x270 lib/crc16.c:58 ext4_group_desc_csum+0x90b/0xc40 fs/ext4/super.c:2841 ext4_group_desc_csum_set+0x197/0x230 fs/ext4/super.c:2864 ext4_mb_mark_diskspace_used+0xbe7/0x14c0 fs/ext4/mballoc.c:3861 ext4_mb_new_blocks+0x14d0/0x4d50 fs/ext4/mballoc.c:5641 ext4_ext_map_blocks+0x1986/0x7220 fs/ext4/extents.c:4287 ext4_map_blocks+0xaad/0x1e30 fs/ext4/inode.c:645 _ext4_get_block+0x23b/0x660 fs/ext4/inode.c:802 ext4_block_write_begin+0x6b0/0x13a0 fs/ext4/inode.c:1087 ext4_write_begin+0x6c6/0x15f0 ext4_da_write_begin+0x342/0xb60 fs/ext4/inode.c:2973 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776 ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269 ext4_file_write_iter+0x87c/0x1990 do_iter_readv_writev+0x594/0x7a0 do_iter_write+0x1ea/0x760 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_writev+0x281/0x470 fs/read_write.c:971 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7ff68d2ea169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff68b85c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007ff68d409f80 RCX: 00007ff68d2ea169 RDX: 0000000000000005 RSI: 0000000020000300 RDI: 0000000000000006 RBP: 00007ff68d345ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffda58ba3cf R14: 00007ff68b85c300 R15: 0000000000022000 </TASK> Allocated by task 4018: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x168/0x300 mm/slub.c:4407 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x26b/0x530 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x5a2/0x5e0 security/tomoyo/realpath.c:288 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x225/0x810 security/tomoyo/file.c:723 security_file_ioctl+0x6d/0xa0 security/security.c:1555 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x47/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 4018: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0xf1/0x270 mm/slub.c:4559 tomoyo_path_number_perm+0x648/0x810 security/tomoyo/file.c:736 security_file_ioctl+0x6d/0xa0 security/security.c:1555 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x47/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88801a9f7000 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff88801a9f7000, ffff88801a9f7020) The buggy address belongs to the page: page:ffffea00006a7dc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a9f7 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00007a6b40 0000001a0000001a ffff888011c41500 raw: 0000000000000000 0000000000400040 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4901, ts 238256160244, free_ts 238254112882 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159 __alloc_pages+0x272/0x700 mm/page_alloc.c:5421 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0x1a0/0x290 mm/slub.c:3245 kmalloc include/linux/slab.h:591 [inline] io_drain_req+0x43e/0x970 io_uring/io_uring.c:6761 io_queue_sqe io_uring/io_uring.c:7238 [inline] io_submit_sqe io_uring/io_uring.c:7419 [inline] io_submit_sqes+0x68ac/0xa410 io_uring/io_uring.c:7525 __do_sys_io_uring_enter io_uring/io_uring.c:10254 [inline] __se_sys_io_uring_enter+0x28b/0x21c0 io_uring/io_uring.c:10196 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 __vunmap+0x8d4/0xa20 mm/vmalloc.c:2621 free_work+0x57/0x80 mm/vmalloc.c:95 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2306 worker_thread+0xaca/0x1280 kernel/workqueue.c:2453 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Memory state around the buggy address: ffff88801a9f6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801a9f6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88801a9f7000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff88801a9f7080: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff88801a9f7100: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2023/04/24 11:08	linux-5.15.y	3299fb36854f	2b32bd34	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	KASAN: use-after-free Read in ext4_group_desc_csum

Crashes (1):

Assets (help?)