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Date: Tue, 14 May 2024 00:49:50 -0400 From: Shuangpeng Bai <shuangpengbai@...il.com> To: shaggy@...nel.org, halip0503@...il.com, mirimmad17@...il.com Cc: jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org, syzkaller@...glegroups.com Subject: UBSAN: shift-out-of-bounds in extAlloc Hi Kernel Maintainers, Our tool found a kernel bug UBSAN: shift-out-of-bounds in extAlloc. Please see the details below. Kenrel commit: v6.9 (Commits on May 12, 2024) Kernel config: attachment C/Syz reproducer: attachment We find this bug was reported and marked as fixed. (https://syzkaller.appspot.com/bug?extid=5f088f29593e6b4c8db8) Our reproducer can trigger this bug in v6.9, so the bug may have not been fixed correctly. Please let me know for anything I can help. Best, Shuangpeng Download attachment ".config" of type "application/octet-stream" (247338 bytes) Download attachment "repro.c" of type "application/octet-stream" (124503 bytes) [ 50.191193][ T8049] ------------[ cut here ]------------ [ 50.191644][ T8049] UBSAN: shift-out-of-bounds in fs/jfs/jfs_extent.c:319:16 [ 50.192192][ T8049] shift exponent 127 is too large for 64-bit type 'long long int' [ 50.192784][ T8049] CPU: 0 PID: 8049 Comm: a.out Not tainted 6.9.0 #7 [ 50.193284][ T8049] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 [ 50.193967][ T8049] Call Trace: [ 50.194226][ T8049] <TASK> [ 50.194456][ T8049] dump_stack_lvl (lib/dump_stack.c:117) [ 50.196667][ T8049] __ubsan_handle_shift_out_of_bounds (lib/ubsan.c:232 lib/ubsan.c:468) [ 50.197169][ T8049] ? mutex_lock (./arch/x86/include/asm/atomic64_64.h:109 /include/linux/atomic/atomic-arch-fallback.h:4296 /include/linux/atomic/atomic-long.h:1482 /include/linux/atomic/atomic-instrumented.h:4458 kernel/locking/mutex.c:171 kernel/locking/mutex.c:285) [ 50.197516][ T8049] ? __pfx_mutex_lock (kernel/locking/mutex.c:282) [ 50.197906][ T8049] ? xas_load (lib/xarray.c:249) [ 50.198246][ T8049] extAlloc.cold (fs/jfs/jfs_extent.c:319 fs/jfs/jfs_extent.c:122) [ 50.198607][ T8049] ? __pfx_extAlloc (fs/jfs/jfs_extent.c:71) [ 50.198981][ T8049] ? __pfx_down_write (kernel/locking/rwsem.c:1577) [ 50.199369][ T8049] ? kmem_cache_alloc (./arch/x86/include/asm/jump_label.h:55 /include/linux/memcontrol.h:1839 mm/slub.c:1980 mm/slub.c:3813 mm/slub.c:3851 mm/slub.c:3858) [ 50.199768][ T8049] ? __filemap_add_folio (mm/filemap.c:853) [ 50.200191][ T8049] jfs_get_block (fs/jfs/inode.c:249) [ 50.200562][ T8049] ? __pfx_jfs_get_block (fs/jfs/inode.c:201) [ 50.200965][ T8049] ? folio_flags.constprop.0 (./include/linux/page-flags.h:325) [ 50.201399][ T8049] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:103 /include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) [ 50.201786][ T8049] __block_write_begin_int (fs/buffer.c:2108) [ 50.202223][ T8049] ? __pfx_jfs_get_block (fs/jfs/inode.c:201) [ 50.202627][ T8049] ? __pfx___block_write_begin_int (fs/buffer.c:2072) [ 50.203099][ T8049] ? __pfx_jfs_get_block (fs/jfs/inode.c:201) [ 50.203503][ T8049] block_write_begin (fs/buffer.c:2214) [ 50.203895][ T8049] jfs_write_begin (fs/jfs/inode.c:300) [ 50.204264][ T8049] generic_perform_write (mm/filemap.c:3976) [ 50.204686][ T8049] ? __pfx_generic_perform_write (mm/filemap.c:3938) [ 50.205145][ T8049] ? generic_update_time (fs/inode.c:1909) [ 50.205553][ T8049] ? mnt_put_write_access_file (fs/namespace.c:494) [ 50.206001][ T8049] __generic_file_write_iter (mm/filemap.c:4069) [ 50.206439][ T8049] generic_file_write_iter (./include/linux/fs.h:800 mm/filemap.c:4096) [ 50.206859][ T8049] ? rw_verify_area (fs/read_write.c:382) [ 50.207239][ T8049] vfs_write (fs/read_write.c:498 fs/read_write.c:590) [ 50.207583][ T8049] ? __pfx_vfs_write (fs/read_write.c:571) [ 50.207965][ T8049] ? __pfx_do_sys_openat2 (fs/open.c:1392) [ 50.208381][ T8049] ? __fput (fs/file_table.c:436) [ 50.208714][ T8049] ? kmem_cache_free (mm/slub.c:4286 mm/slub.c:4350) [ 50.209100][ T8049] ksys_write (fs/read_write.c:644) [ 50.209448][ T8049] ? __pfx_ksys_write (fs/read_write.c:633) [ 50.209838][ T8049] ? fpregs_restore_userregs (./arch/x86/include/asm/bitops.h:75 /include/asm-generic/bitops/instrumented-atomic.h:42 /include/linux/thread_info.h:94 arch/x86/kernel/fpu/context.h:79) [ 50.210285][ T8049] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 50.210648][ T8049] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 50.211111][ T8049] RIP: 0033:0x7f265b6f673d [ 50.211461][ T8049] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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> 3d8 All code ======== 0: 00 c3 add %al,%bl 2: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 9: 00 00 00 c: 90 nop d: f3 0f 1e fa endbr64 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 28: 0f 05 syscall 2a:* 48 rex.W <-- trapping instruction 2b: d8 .byte 0xd8 Code starting with the faulting instruction =========================================== 0: 48 rex.W 1: d8 .byte 0xd8 [ 50.212919][ T8049] RSP: 002b:00007ffdc75bd478 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 50.213563][ T8049] RAX: ffffffffffffffda RBX: 000055cc22691e90 RCX: 00007f265b6f673d [ 50.214168][ T8049] RDX: 00000000fffffd1a RSI: 0000000020000140 RDI: 0000000000000004 [ 50.214772][ T8049] RBP: 00007ffdc75bd490 R08: 00007ffdc75bd580 R09: 00007ffdc75bd580 [ 50.215375][ T8049] R10: 0000000000000000 R11: 0000000000000202 R12: 000055cc22690340 [ 50.215979][ T8049] R13: 00007ffdc75bd580 R14: 0000000000000000 R15: 0000000000000000 [ 50.216588][ T8049] </TASK> [ 50.217227][ T8049] ---[ end trace ]--- [ 50.217543][ T8049] Kernel panic - not syncing: UBSAN: panic_on_warn set ... [ 50.218087][ T8049] CPU: 0 PID: 8049 Comm: a.out Not tainted 6.9.0 #7 [ 50.218591][ T8049] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 [ 50.219272][ T8049] Call Trace: [ 50.219529][ T8049] <TASK> [ 50.219760][ T8049] dump_stack_lvl (lib/dump_stack.c:118 (discriminator 4)) [ 50.220124][ T8049] panic (kernel/panic.c:348) [ 50.220437][ T8049] ? __pfx_panic (kernel/panic.c:282) [ 50.220786][ T8049] ? __pfx__printk (kernel/printk/printk.c:2368) [ 50.221149][ T8049] ? check_panic_on_warn (kernel/panic.c:240) [ 50.221547][ T8049] check_panic_on_warn (kernel/panic.c:241) [ 50.221932][ T8049] __ubsan_handle_shift_out_of_bounds (./arch/x86/include/asm/smap.h:56 lib/ubsan.c:470) [ 50.222425][ T8049] ? mutex_lock (./arch/x86/include/asm/atomic64_64.h:109 /include/linux/atomic/atomic-arch-fallback.h:4296 /include/linux/atomic/atomic-long.h:1482 /include/linux/atomic/atomic-instrumented.h:4458 kernel/locking/mutex.c:171 kernel/locking/mutex.c:285) [ 50.222766][ T8049] ? __pfx_mutex_lock (kernel/locking/mutex.c:282) [ 50.223148][ T8049] ? xas_load (lib/xarray.c:249) [ 50.223482][ T8049] extAlloc.cold (fs/jfs/jfs_extent.c:319 fs/jfs/jfs_extent.c:122) [ 50.223839][ T8049] ? __pfx_extAlloc (fs/jfs/jfs_extent.c:71) [ 50.224206][ T8049] ? __pfx_down_write (kernel/locking/rwsem.c:1577) [ 50.224594][ T8049] ? kmem_cache_alloc (./arch/x86/include/asm/jump_label.h:55 /include/linux/memcontrol.h:1839 mm/slub.c:1980 mm/slub.c:3813 mm/slub.c:3851 mm/slub.c:3858) [ 50.224986][ T8049] ? __filemap_add_folio (mm/filemap.c:853) [ 50.225401][ T8049] jfs_get_block (fs/jfs/inode.c:249) [ 50.225764][ T8049] ? __pfx_jfs_get_block (fs/jfs/inode.c:201) [ 50.226162][ T8049] ? folio_flags.constprop.0 (./include/linux/page-flags.h:325) [ 50.226594][ T8049] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:103 /include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) [ 50.226974][ T8049] __block_write_begin_int (fs/buffer.c:2108) [ 50.227405][ T8049] ? __pfx_jfs_get_block (fs/jfs/inode.c:201) [ 50.227802][ T8049] ? __pfx___block_write_begin_int (fs/buffer.c:2072) [ 50.228267][ T8049] ? __pfx_jfs_get_block (fs/jfs/inode.c:201) [ 50.228667][ T8049] block_write_begin (fs/buffer.c:2214) [ 50.229050][ T8049] jfs_write_begin (fs/jfs/inode.c:300) [ 50.229411][ T8049] generic_perform_write (mm/filemap.c:3976) [ 50.229823][ T8049] ? __pfx_generic_perform_write (mm/filemap.c:3938) [ 50.230274][ T8049] ? generic_update_time (fs/inode.c:1909) [ 50.230675][ T8049] ? mnt_put_write_access_file (fs/namespace.c:494) [ 50.231115][ T8049] __generic_file_write_iter (mm/filemap.c:4069) [ 50.231547][ T8049] generic_file_write_iter (./include/linux/fs.h:800 mm/filemap.c:4096) [ 50.231962][ T8049] ? rw_verify_area (fs/read_write.c:382) [ 50.232341][ T8049] vfs_write (fs/read_write.c:498 fs/read_write.c:590) [ 50.232681][ T8049] ? __pfx_vfs_write (fs/read_write.c:571) [ 50.233057][ T8049] ? __pfx_do_sys_openat2 (fs/open.c:1392) [ 50.233460][ T8049] ? __fput (fs/file_table.c:436) [ 50.233787][ T8049] ? kmem_cache_free (mm/slub.c:4286 mm/slub.c:4350) [ 50.234169][ T8049] ksys_write (fs/read_write.c:644) [ 50.234512][ T8049] ? __pfx_ksys_write (fs/read_write.c:633) [ 50.234896][ T8049] ? fpregs_restore_userregs (./arch/x86/include/asm/bitops.h:75 /include/asm-generic/bitops/instrumented-atomic.h:42 /include/linux/thread_info.h:94 arch/x86/kernel/fpu/context.h:79) [ 50.235334][ T8049] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 50.235693][ T8049] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 50.236151][ T8049] RIP: 0033:0x7f265b6f673d [ 50.236500][ T8049] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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> 3d8 All code ======== 0: 00 c3 add %al,%bl 2: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 9: 00 00 00 c: 90 nop d: f3 0f 1e fa endbr64 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 28: 0f 05 syscall 2a:* 48 rex.W <-- trapping instruction 2b: d8 .byte 0xd8 Code starting with the faulting instruction =========================================== 0: 48 rex.W 1: d8 .byte 0xd8 [ 50.237935][ T8049] RSP: 002b:00007ffdc75bd478 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 50.238567][ T8049] RAX: ffffffffffffffda RBX: 000055cc22691e90 RCX: 00007f265b6f673d [ 50.239163][ T8049] RDX: 00000000fffffd1a RSI: 0000000020000140 RDI: 0000000000000004 [ 50.239762][ T8049] RBP: 00007ffdc75bd490 R08: 00007ffdc75bd580 R09: 00007ffdc75bd580 [ 50.240363][ T8049] R10: 0000000000000000 R11: 0000000000000202 R12: 000055cc22690340 [ 50.240960][ T8049] R13: 00007ffdc75bd580 R14: 0000000000000000 R15: 0000000000000000 [ 50.241558][ T8049] </TASK> [ 50.241883][ T8049] Kernel Offset: disabled [ 50.242215][ T8049] Rebooting in 86400 seconds..
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