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KASAN: stack-out-of-bounds Read in gfs2_file_read_iter (3)

Status: upstream: reported on 2026/06/01 03:40
Reported-by: syzbot+09675e90f1ef60d6ed3d@syzkaller.appspotmail.com
First crash: 51d, last: 8d10h
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: stack-out-of-bounds Read in gfs2_file_read_iter (2) 17 341 142d 822d 0/3 auto-obsoleted due to no activity on 2026/05/11 16:12
linux-5.15 KASAN: stack-out-of-bounds Read in gfs2_file_read_iter 17 15 1040d 1054d 0/3 auto-obsoleted due to no activity on 2023/11/25 16:09

Sample crash report:
==================================================================
BUG: KASAN: stack-out-of-bounds in should_fault_in_pages fs/gfs2/file.c:785 [inline]
BUG: KASAN: stack-out-of-bounds in gfs2_file_read_iter+0x90c/0xdc0 fs/gfs2/file.c:995
Read of size 8 at addr ffffc9000431eeb0 by task syz.3.6/4277

CPU: 1 PID: 4277 Comm: syz.3.6 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 should_fault_in_pages fs/gfs2/file.c:785 [inline]
 gfs2_file_read_iter+0x90c/0xdc0 fs/gfs2/file.c:995
 __kernel_read+0x51d/0x980 fs/read_write.c:443
 integrity_kernel_read+0x86/0xd0 security/integrity/iint.c:228
 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline]
 ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
 ima_calc_file_hash+0x946/0x1940 security/integrity/ima/ima_crypto.c:573
 ima_collect_measurement+0x335/0x7e0 security/integrity/ima/ima_api.c:255
 process_measurement+0x1185/0x1c20 security/integrity/ima/ima_main.c:351
 ima_file_check+0xc7/0x110 security/integrity/ima/ima_main.c:533
 do_open fs/namei.c:3618 [inline]
 path_openat+0x27cf/0x2fb0 fs/namei.c:3750
 do_filp_open+0x1df/0x400 fs/namei.c:3777
 do_sys_openat2+0x14b/0x500 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_open fs/open.c:1279 [inline]
 __se_sys_open fs/open.c:1275 [inline]
 __x64_sys_open+0x11b/0x140 fs/open.c:1275
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f00f06f2e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f00ee94b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f00f097afa0 RCX: 00007f00f06f2e59
RDX: 0000000000000045 RSI: 0000000000020042 RDI: 00002000000001c0
RBP: 00007f00f0788e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00f097b038 R14: 00007f00f097afa0 R15: 00007ffd384ee9c8
 </TASK>


addr ffffc9000431eeb0 is located in stack of task syz.3.6/4277 at offset 48 in frame:
 __kernel_read+0x0/0x980

this frame has 3 objects:
 [32, 48) 'iov'
 [64, 112) 'kiocb'
 [144, 184) 'iter'

Memory state around the buggy address:
 ffffc9000431ed80: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
 ffffc9000431ee00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000431ee80: f1 f1 f1 f1 00 00 f2 f2 00 00 00 00 00 00 f2 f2
                                     ^
 ffffc9000431ef00: f2 f2 00 00 00 00 00 f3 f3 f3 f3 f3 00 00 00 00
 ffffc9000431ef80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f3 f3 f3
==================================================================

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/14 06:26 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/07/14 06:21 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/07/12 17:56 linux-5.15.y c86c4726e7f0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/07/11 22:10 linux-5.15.y c86c4726e7f0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/07/11 22:08 linux-5.15.y c86c4726e7f0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/07/10 22:17 linux-5.15.y c86c4726e7f0 99e64375 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/07/10 22:16 linux-5.15.y c86c4726e7f0 99e64375 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/07/07 06:56 linux-5.15.y c86c4726e7f0 8e71ce95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/06/22 01:50 linux-5.15.y eceeec79dbc6 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/06/20 07:31 linux-5.15.y eceeec79dbc6 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/06/13 14:02 linux-5.15.y dc027a595035 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/06/02 04:51 linux-5.15.y dc027a595035 1095583b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/06/02 04:51 linux-5.15.y dc027a595035 1095583b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/06/01 03:42 linux-5.15.y 241d66fa280c 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
2026/06/01 03:40 linux-5.15.y 241d66fa280c 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: stack-out-of-bounds Read in gfs2_file_read_iter
* Struck through repros no longer work on HEAD.