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Sat, 11 Jan 2025 22:45:21 -0800 (PST) Date: Sat, 11 Jan 2025 22:45:21 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67836501.050a0220.216c54.002c.GAE@google.com> Subject: [syzbot] [iommu?] UBSAN: shift-out-of-bounds in iova_bitmap_alloc From: syzbot To: iommu@lists.linux.dev, jgg@nvidia.com, jgg@ziepe.ca, joao.m.martins@oracle.com, joro@8bytes.org, kevin.tian@intel.com, linux-kernel@vger.kernel.org, robin.murphy@arm.com, syzkaller-bugs@googlegroups.com, will@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 09a0fa92e5b4 Merge tag 'selinux-pr-20250107' of git://git... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=16e35b0f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=4ef22c4fce5135b4 dashboard link: https://syzkaller.appspot.com/bug?extid=85992ace37d5b7b51635 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=121fbedf980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159e8ef8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c59c19cd5728/disk-09a0fa92.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/27a8ecc530b5/vmlinux-09a0fa92.xz kernel image: https://storage.googleapis.com/syzbot-assets/6ed4573ed205/bzImage-09a0fa92.xz The issue was bisected to: commit 266ce58989ba05e2a24460fdbf402d766c2e3870 Author: Joao Martins Date: Tue Oct 24 13:51:05 2023 +0000 iommufd/selftest: Test IOMMU_HWPT_ALLOC_DIRTY_TRACKING bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11f3b218580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=13f3b218580000 console output: https://syzkaller.appspot.com/x/log.txt?x=15f3b218580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+85992ace37d5b7b51635@syzkaller.appspotmail.com Fixes: 266ce58989ba ("iommufd/selftest: Test IOMMU_HWPT_ALLOC_DIRTY_TRACKING") iommufd_mock iommufd_mock0: Adding to iommu group 0 ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in drivers/iommu/iommufd/iova_bitmap.c:133:27 shift exponent 63 is too large for 32-bit type 'int' CPU: 1 UID: 0 PID: 5829 Comm: syz-executor365 Not tainted 6.13.0-rc6-syzkaller-00038-g09a0fa92e5b4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468 iova_bitmap_offset_to_index drivers/iommu/iommufd/iova_bitmap.c:133 [inline] iova_bitmap_alloc+0x2bd/0x2d0 drivers/iommu/iommufd/iova_bitmap.c:259 iommu_read_and_clear_dirty drivers/iommu/iommufd/io_pagetable.c:534 [inline] iopt_read_and_clear_dirty_data+0x35a/0x6c0 drivers/iommu/iommufd/io_pagetable.c:594 iommufd_hwpt_get_dirty_bitmap+0x17c/0x2e0 drivers/iommu/iommufd/hw_pagetable.c:470 iommufd_fops_ioctl+0x4d6/0x5a0 drivers/iommu/iommufd/main.c:409 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa2fda974a9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc593f2558 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffc593f2728 RCX: 00007fa2fda974a9 RDX: 0000000020000300 RSI: 0000000000003b8c RDI: 0000000000000003 RBP: 00007fa2fdb0a610 R08: 00007ffc593f2728 R09: 00007ffc593f2728 R10: 00007ffc593f2728 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc593f2718 R14: 0000000000000001 R15: 0000000000000001 ---[ end trace ]--- --- 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 syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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