[v5.15] KASAN: vmalloc-out-of-bounds Read in z_erofs_lz4_decompress
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syzbot
Feb 25, 2025, 2:01:23 PM2/25/25
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: c16c81c81336 Linux 5.15.178
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=103c57a4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=3ca28fba9b2e5c5
dashboard link: https://syzkaller.appspot.com/bug?extid=97e2bfc681254dbac9d6
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3f2947e5e4dc/disk-c16c81c8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7034800fdaa8/vmlinux-c16c81c8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/42337be7c213/Image-c16c81c8.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+97e2bf...@syzkaller.appspotmail.com
loop6: rw=524288, want=32, limit=16
erofs: (device loop6): z_erofs_lz4_decompress: failed to decompress -29 in[58, 4038] out[3537]
==================================================================
BUG: KASAN: vmalloc-out-of-bounds in hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193
Read of size 1 at addr ffff80001fccf000 by task syz.6.976/9938
CPU: 1 PID: 9938 Comm: syz.6.976 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x174/0x1e4 mm/kasan/report.c:451
__asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306
hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193
print_hex_dump+0x140/0x248 lib/hexdump.c:276
z_erofs_lz4_decompress+0x7a0/0xf28 fs/erofs/decompressor.c:243
z_erofs_decompress_generic fs/erofs/decompressor.c:332 [inline]
z_erofs_decompress+0x720/0xeec fs/erofs/decompressor.c:410
z_erofs_decompress_pcluster fs/erofs/zdata.c:980 [inline]
z_erofs_decompress_queue+0x1158/0x1bc0 fs/erofs/zdata.c:1058
z_erofs_runqueue+0x11d0/0x1474 fs/erofs/zdata.c:1370
z_erofs_readahead+0x864/0xc98 fs/erofs/zdata.c:1459
read_pages+0x13c/0x420 mm/readahead.c:130
page_cache_ra_unbounded+0x534/0x654 mm/readahead.c:239
do_page_cache_ra mm/readahead.c:269 [inline]
force_page_cache_ra+0x320/0x388 mm/readahead.c:301
force_page_cache_readahead mm/internal.h:78 [inline]
generic_fadvise+0x490/0x750 mm/fadvise.c:107
vfs_fadvise mm/fadvise.c:186 [inline]
ksys_fadvise64_64 mm/fadvise.c:200 [inline]
__do_sys_fadvise64_64 mm/fadvise.c:208 [inline]
__se_sys_fadvise64_64 mm/fadvise.c:206 [inline]
__arm64_sys_fadvise64_64+0x12c/0x174 mm/fadvise.c:206
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Memory state around the buggy address:
ffff80001fccef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff80001fccef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff80001fccf000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
^
ffff80001fccf080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
ffff80001fccf100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================
Unable to handle kernel paging request at virtual address ffff80001fccf000
Mem abort info:
ESR = 0x0000000096000007
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x07: level 3 translation fault
Data abort info:
ISV = 0, ISS = 0x00000007
CM = 0, WnR = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001ae196000
[ffff80001fccf000] pgd=100000023ffff003, p4d=100000023ffff003, pud=100000023fffe003, pmd=10000001079cb003, pte=0000000000000000
Internal error: Oops: 0000000096000007 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 9938 Comm: syz.6.976 Tainted: G B 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : hex_dump_to_buffer+0x4d4/0x984 lib/hexdump.c:193
lr : hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193
sp : ffff800020d56a00
x29: ffff800020d56a40 x28: 000000000000000b x27: 0000000000000021
x26: ffff800020d56b1f x25: ffff80001fccf000 x24: 0000000000000022
x23: dfff800000000000 x22: 0000000000000083 x21: 0000000000000021
x20: 0000000000000000 x19: 0000000000000023 x18: 0000000000000005
x17: 0000000000000002 x16: ffff80000824ec08 x15: 00000000ffffffff
x14: ffff0000d1b0d1c0 x13: 0000000000000001 x12: 0000000000080000
x11: 000000000007b785 x10: ffff80002e24f000 x9 : 0000000000000000
x8 : ffff0000d1b0d1c0 x7 : 0000000000000000 x6 : 0000000000000001
x5 : ffff800020d56098 x4 : 0000000000000000 x3 : ffff80000819c3f0
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000001
Call trace:
hex_dump_to_buffer+0x4d4/0x984 lib/hexdump.c:193
print_hex_dump+0x140/0x248 lib/hexdump.c:276
z_erofs_lz4_decompress+0x7a0/0xf28 fs/erofs/decompressor.c:243
z_erofs_decompress_generic fs/erofs/decompressor.c:332 [inline]
z_erofs_decompress+0x720/0xeec fs/erofs/decompressor.c:410
z_erofs_decompress_pcluster fs/erofs/zdata.c:980 [inline]
z_erofs_decompress_queue+0x1158/0x1bc0 fs/erofs/zdata.c:1058
z_erofs_runqueue+0x11d0/0x1474 fs/erofs/zdata.c:1370
z_erofs_readahead+0x864/0xc98 fs/erofs/zdata.c:1459
read_pages+0x13c/0x420 mm/readahead.c:130
page_cache_ra_unbounded+0x534/0x654 mm/readahead.c:239
do_page_cache_ra mm/readahead.c:269 [inline]
force_page_cache_ra+0x320/0x388 mm/readahead.c:301
force_page_cache_readahead mm/internal.h:78 [inline]
generic_fadvise+0x490/0x750 mm/fadvise.c:107
vfs_fadvise mm/fadvise.c:186 [inline]
ksys_fadvise64_64 mm/fadvise.c:200 [inline]
__do_sys_fadvise64_64 mm/fadvise.c:208 [inline]
__se_sys_fadvise64_64 mm/fadvise.c:206 [inline]
__arm64_sys_fadvise64_64+0x12c/0x174 mm/fadvise.c:206
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: 8b1c0119 d343ff28 38f76908 350007c8 (39400334)
---[ end trace 3e51eb7a99296f9e ]---
----------------
Code disassembly (best guess):
0: 8b1c0119 add x25, x8, x28
4: d343ff28 lsr x8, x25, #3
8: 38f76908 ldrsb w8, [x8, x23]
c: 350007c8 cbnz w8, 0x104
* 10: 39400334 ldrb w20, [x25] <-- trapping instruction
---
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: c16c81c81336 Linux 5.15.178
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=103c57a4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=3ca28fba9b2e5c5
dashboard link: https://syzkaller.appspot.com/bug?extid=97e2bfc681254dbac9d6
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3f2947e5e4dc/disk-c16c81c8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7034800fdaa8/vmlinux-c16c81c8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/42337be7c213/Image-c16c81c8.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+97e2bf...@syzkaller.appspotmail.com
loop6: rw=524288, want=32, limit=16
erofs: (device loop6): z_erofs_lz4_decompress: failed to decompress -29 in[58, 4038] out[3537]
==================================================================
BUG: KASAN: vmalloc-out-of-bounds in hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193
Read of size 1 at addr ffff80001fccf000 by task syz.6.976/9938
CPU: 1 PID: 9938 Comm: syz.6.976 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x174/0x1e4 mm/kasan/report.c:451
__asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306
hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193
print_hex_dump+0x140/0x248 lib/hexdump.c:276
z_erofs_lz4_decompress+0x7a0/0xf28 fs/erofs/decompressor.c:243
z_erofs_decompress_generic fs/erofs/decompressor.c:332 [inline]
z_erofs_decompress+0x720/0xeec fs/erofs/decompressor.c:410
z_erofs_decompress_pcluster fs/erofs/zdata.c:980 [inline]
z_erofs_decompress_queue+0x1158/0x1bc0 fs/erofs/zdata.c:1058
z_erofs_runqueue+0x11d0/0x1474 fs/erofs/zdata.c:1370
z_erofs_readahead+0x864/0xc98 fs/erofs/zdata.c:1459
read_pages+0x13c/0x420 mm/readahead.c:130
page_cache_ra_unbounded+0x534/0x654 mm/readahead.c:239
do_page_cache_ra mm/readahead.c:269 [inline]
force_page_cache_ra+0x320/0x388 mm/readahead.c:301
force_page_cache_readahead mm/internal.h:78 [inline]
generic_fadvise+0x490/0x750 mm/fadvise.c:107
vfs_fadvise mm/fadvise.c:186 [inline]
ksys_fadvise64_64 mm/fadvise.c:200 [inline]
__do_sys_fadvise64_64 mm/fadvise.c:208 [inline]
__se_sys_fadvise64_64 mm/fadvise.c:206 [inline]
__arm64_sys_fadvise64_64+0x12c/0x174 mm/fadvise.c:206
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Memory state around the buggy address:
ffff80001fccef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff80001fccef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff80001fccf000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
^
ffff80001fccf080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
ffff80001fccf100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================
Unable to handle kernel paging request at virtual address ffff80001fccf000
Mem abort info:
ESR = 0x0000000096000007
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x07: level 3 translation fault
Data abort info:
ISV = 0, ISS = 0x00000007
CM = 0, WnR = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001ae196000
[ffff80001fccf000] pgd=100000023ffff003, p4d=100000023ffff003, pud=100000023fffe003, pmd=10000001079cb003, pte=0000000000000000
Internal error: Oops: 0000000096000007 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 9938 Comm: syz.6.976 Tainted: G B 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : hex_dump_to_buffer+0x4d4/0x984 lib/hexdump.c:193
lr : hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193
sp : ffff800020d56a00
x29: ffff800020d56a40 x28: 000000000000000b x27: 0000000000000021
x26: ffff800020d56b1f x25: ffff80001fccf000 x24: 0000000000000022
x23: dfff800000000000 x22: 0000000000000083 x21: 0000000000000021
x20: 0000000000000000 x19: 0000000000000023 x18: 0000000000000005
x17: 0000000000000002 x16: ffff80000824ec08 x15: 00000000ffffffff
x14: ffff0000d1b0d1c0 x13: 0000000000000001 x12: 0000000000080000
x11: 000000000007b785 x10: ffff80002e24f000 x9 : 0000000000000000
x8 : ffff0000d1b0d1c0 x7 : 0000000000000000 x6 : 0000000000000001
x5 : ffff800020d56098 x4 : 0000000000000000 x3 : ffff80000819c3f0
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000001
Call trace:
hex_dump_to_buffer+0x4d4/0x984 lib/hexdump.c:193
print_hex_dump+0x140/0x248 lib/hexdump.c:276
z_erofs_lz4_decompress+0x7a0/0xf28 fs/erofs/decompressor.c:243
z_erofs_decompress_generic fs/erofs/decompressor.c:332 [inline]
z_erofs_decompress+0x720/0xeec fs/erofs/decompressor.c:410
z_erofs_decompress_pcluster fs/erofs/zdata.c:980 [inline]
z_erofs_decompress_queue+0x1158/0x1bc0 fs/erofs/zdata.c:1058
z_erofs_runqueue+0x11d0/0x1474 fs/erofs/zdata.c:1370
z_erofs_readahead+0x864/0xc98 fs/erofs/zdata.c:1459
read_pages+0x13c/0x420 mm/readahead.c:130
page_cache_ra_unbounded+0x534/0x654 mm/readahead.c:239
do_page_cache_ra mm/readahead.c:269 [inline]
force_page_cache_ra+0x320/0x388 mm/readahead.c:301
force_page_cache_readahead mm/internal.h:78 [inline]
generic_fadvise+0x490/0x750 mm/fadvise.c:107
vfs_fadvise mm/fadvise.c:186 [inline]
ksys_fadvise64_64 mm/fadvise.c:200 [inline]
__do_sys_fadvise64_64 mm/fadvise.c:208 [inline]
__se_sys_fadvise64_64 mm/fadvise.c:206 [inline]
__arm64_sys_fadvise64_64+0x12c/0x174 mm/fadvise.c:206
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: 8b1c0119 d343ff28 38f76908 350007c8 (39400334)
---[ end trace 3e51eb7a99296f9e ]---
----------------
Code disassembly (best guess):
0: 8b1c0119 add x25, x8, x28
4: d343ff28 lsr x8, x25, #3
8: 38f76908 ldrsb w8, [x8, x23]
c: 350007c8 cbnz w8, 0x104
* 10: 39400334 ldrb w20, [x25] <-- trapping instruction
---
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
Feb 25, 2025, 2:22:27 PM2/25/25
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: c16c81c81336 Linux 5.15.178
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14c257a4580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1273ec98580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3f2947e5e4dc/disk-c16c81c8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7034800fdaa8/vmlinux-c16c81c8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/42337be7c213/Image-c16c81c8.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/c3c96466a94c/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=133d26e4580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+97e2bf...@syzkaller.appspotmail.com
loop0: rw=524288, want=32, limit=16
erofs: (device loop0): z_erofs_lz4_decompress: failed to decompress -29 in[58, 4038] out[3537]
CPU: 0 PID: 4018 Comm: syz-executor247 Not tainted 5.15.178-syzkaller #0
ffff80001bdfef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff80001bdfef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff80001bdff000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
^
ffff80001bdff080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
ffff80001bdff100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================
Unable to handle kernel paging request at virtual address ffff80001bdff000
x29: ffff80001d656a40 x28: 000000000000000b x27: 0000000000000021
x26: ffff80001d656b1f x25: ffff80001bdff000 x24: 0000000000000022
x14: ffff0000cacf1b40 x13: 0000000000000001 x12: ffff700002e3a964
x11: 0000000000000003 x10: 0000000000000000 x9 : 0000000000000000
x8 : ffff0000cacf1b40 x7 : 0000000000000000 x6 : 0000000000000001
x5 : ffff80001d656098 x4 : 0000000000000000 x3 : ffff80000819c3f0
---[ end trace d2c8189049ca58d0 ]---
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: c16c81c81336 Linux 5.15.178
git tree: linux-5.15.y
kernel config: https://syzkaller.appspot.com/x/.config?x=3ca28fba9b2e5c5
dashboard link: https://syzkaller.appspot.com/bug?extid=97e2bfc681254dbac9d6
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c257a4580000
dashboard link: https://syzkaller.appspot.com/bug?extid=97e2bfc681254dbac9d6
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1273ec98580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3f2947e5e4dc/disk-c16c81c8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7034800fdaa8/vmlinux-c16c81c8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/42337be7c213/Image-c16c81c8.gz.xz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=133d26e4580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+97e2bf...@syzkaller.appspotmail.com
erofs: (device loop0): z_erofs_lz4_decompress: failed to decompress -29 in[58, 4038] out[3537]
==================================================================
BUG: KASAN: vmalloc-out-of-bounds in hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193
Read of size 1 at addr ffff80001bdff000 by task syz-executor247/4018
BUG: KASAN: vmalloc-out-of-bounds in hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193
CPU: 0 PID: 4018 Comm: syz-executor247 Not tainted 5.15.178-syzkaller #0
ffff80001bdfef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff80001bdff000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
^
ffff80001bdff080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
ffff80001bdff100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================
Unable to handle kernel paging request at virtual address ffff80001bdff000
Mem abort info:
ESR = 0x0000000096000007
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x07: level 3 translation fault
Data abort info:
ISV = 0, ISS = 0x00000007
CM = 0, WnR = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001ae196000
[ffff80001bdff000] pgd=100000023ffff003, p4d=100000023ffff003, pud=100000023fffe003, pmd=100000023fff8003, pte=0000000000000000
ESR = 0x0000000096000007
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x07: level 3 translation fault
Data abort info:
ISV = 0, ISS = 0x00000007
CM = 0, WnR = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001ae196000
Internal error: Oops: 0000000096000007 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4018 Comm: syz-executor247 Tainted: G B 5.15.178-syzkaller #0
Modules linked in:
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : hex_dump_to_buffer+0x4d4/0x984 lib/hexdump.c:193
lr : hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193
sp : ffff80001d656a00
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : hex_dump_to_buffer+0x4d4/0x984 lib/hexdump.c:193
lr : hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193
x29: ffff80001d656a40 x28: 000000000000000b x27: 0000000000000021
x26: ffff80001d656b1f x25: ffff80001bdff000 x24: 0000000000000022
x23: dfff800000000000 x22: 0000000000000083 x21: 0000000000000021
x20: 0000000000000000 x19: 0000000000000023 x18: 0000000000000005
x17: 0000000000000000 x16: ffff80000824ec08 x15: 00000000ffffffff
x20: 0000000000000000 x19: 0000000000000023 x18: 0000000000000005
x14: ffff0000cacf1b40 x13: 0000000000000001 x12: ffff700002e3a964
x11: 0000000000000003 x10: 0000000000000000 x9 : 0000000000000000
x8 : ffff0000cacf1b40 x7 : 0000000000000000 x6 : 0000000000000001
x5 : ffff80001d656098 x4 : 0000000000000000 x3 : ffff80000819c3f0
----------------
Code disassembly (best guess):
0: 8b1c0119 add x25, x8, x28
4: d343ff28 lsr x8, x25, #3
8: 38f76908 ldrsb w8, [x8, x23]
c: 350007c8 cbnz w8, 0x104
* 10: 39400334 ldrb w20, [x25] <-- trapping instruction
---
If you want syzbot to run the reproducer, reply with:
Code disassembly (best guess):
0: 8b1c0119 add x25, x8, x28
4: d343ff28 lsr x8, x25, #3
8: 38f76908 ldrsb w8, [x8, x23]
c: 350007c8 cbnz w8, 0x104
* 10: 39400334 ldrb w20, [x25] <-- trapping instruction
---
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
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