linux-kernel - [Bug] UBSAN: shift-out-of-bounds in sg_build

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Date: Mon, 25 Mar 2024 20:57:37 +0800
From: Sam Sun <samsun1006219@...il.com>
To: linux-kernel@...r.kernel.org
Cc: linux-scsi@...r.kernel.org, martin.petersen@...cle.com, jejb@...ux.ibm.com, 
	dgilbert@...erlog.com, syzkaller@...glegroups.com, xrivendell7@...il.com
Subject: [Bug] UBSAN: shift-out-of-bounds in sg_build_indirect

Dear developers and maintainers,

We encountered a shift-out-of-bounds bug while using our modified
Syzkaller. It is tested against linux kernel 6.9-rc1. Kernel config
and C repro are attached to this email. The UBSAN report is listed
below.

================================================================================
UBSAN: shift-out-of-bounds in /home/sy/linux-original/drivers/scsi/sg.c:1902:13
shift exponent 64 is too large for 32-bit type 'int'
CPU: 1 PID: 8078 Comm: syz-executor748 Not tainted 6.7.0-rc7 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x136/0x150 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_shift_out_of_bounds+0x24b/0x430 lib/ubsan.c:387
 sg_build_indirect.cold+0x1b/0x20 drivers/scsi/sg.c:1902
 sg_build_reserve+0xc4/0x180 drivers/scsi/sg.c:2012
 sg_add_sfp drivers/scsi/sg.c:2194 [inline]
 sg_open+0xde4/0x1810 drivers/scsi/sg.c:350
 chrdev_open+0x269/0x770 fs/char_dev.c:414
 do_dentry_open+0x6d3/0x18d0 fs/open.c:948
 do_open fs/namei.c:3622 [inline]
 path_openat+0x1e1e/0x26d0 fs/namei.c:3779
 do_filp_open+0x1c9/0x410 fs/namei.c:3809
 do_sys_openat2+0x160/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __x64_sys_openat+0x140/0x1f0 fs/open.c:1463
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f48cf37f80b
Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 18 00 00 00 85
c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d
00 f0 ff ff 0f 87 91 00 00 00 48 8b 4c 24 28 64 48 33 0c 25
RSP: 002b:00007ffd29cd7d40 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f48cf37f80b
RDX: 0000000000000041 RSI: 00007ffd29cd7dc0 RDI: 00000000ffffff9c
RBP: 00007ffd29cd7dc0 R08: 000000000000ffff R09: 00007ffd29cd7c50
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000041
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
================================================================================

If you have any questions, please contact us.
Reported by: Yue Sun <samsun1006219@...il.com>
Reported by: xingwei lee <xrivendell7@...il.com>

Best Regards,
Yue

Download attachment "config" of type "application/octet-stream" (247820 bytes)

View attachment "sg_build_indirect.c" of type "text/x-csrc" (4453 bytes)