Messages in this thread | | | Date | Tue, 23 Jul 2019 23:28:06 -0700 | Subject | KASAN: slab-out-of-bounds Read in bpf_int_jit_compile | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: c6dd78fc Merge branch 'x86-urgent-for-linus' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1760ff84600000 kernel config: https://syzkaller.appspot.com/x/.config?x=7937b718ddac333b dashboard link: https://syzkaller.appspot.com/bug?extid=35101610ff3e83119b1b compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c017a4600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=173f8278600000
The bug was bisected to:
commit 2589726d12a1b12eaaa93c7f1ea64287e383c7a5 Author: Alexei Starovoitov <ast@kernel.org> Date: Sat Jun 15 19:12:20 2019 +0000
bpf: introduce bounded loops
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13df66afa00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=103f66afa00000 console output: https://syzkaller.appspot.com/x/log.txt?x=17df66afa00000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+35101610ff3e83119b1b@syzkaller.appspotmail.com Fixes: 2589726d12a1 ("bpf: introduce bounded loops")
================================================================== BUG: KASAN: slab-out-of-bounds in do_jit /arch/x86/net/bpf_jit_comp.c:966 [inline] BUG: KASAN: slab-out-of-bounds in bpf_int_jit_compile+0x4d19/0x7530 /arch/x86/net/bpf_jit_comp.c:1132 Read of size 4 at addr ffff8880960cc2bc by task syz-executor607/7822
CPU: 0 PID: 7822 Comm: syz-executor607 Not tainted 5.2.0+ #37 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack /lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x2f8 /lib/dump_stack.c:113 print_address_description+0x75/0x5b0 /mm/kasan/report.c:351 __kasan_report+0x14b/0x1c0 /mm/kasan/report.c:482 kasan_report+0x26/0x50 /mm/kasan/common.c:612 __asan_report_load4_noabort+0x14/0x20 /mm/kasan/generic_report.c:131 do_jit /arch/x86/net/bpf_jit_comp.c:966 [inline] bpf_int_jit_compile+0x4d19/0x7530 /arch/x86/net/bpf_jit_comp.c:1132 bpf_prog_select_runtime+0x756/0xa50 /kernel/bpf/core.c:1725 bpf_prog_load /kernel/bpf/syscall.c:1702 [inline] __do_sys_bpf+0x7d4e/0xc0e0 /kernel/bpf/syscall.c:2849 __se_sys_bpf /kernel/bpf/syscall.c:2808 [inline] __x64_sys_bpf+0x7a/0x90 /kernel/bpf/syscall.c:2808 do_syscall_64+0xfe/0x140 /arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4402c9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffeb7a02c18 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402c9 RDX: 0000000000000046 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401b50 R13: 0000000000401be0 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 7822: save_stack /mm/kasan/common.c:69 [inline] set_track /mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x11c/0x1b0 /mm/kasan/common.c:487 kasan_kmalloc+0x9/0x10 /mm/kasan/common.c:501 kmem_cache_alloc_trace+0x215/0x2f0 /mm/slab.c:3550 kmalloc /./include/linux/slab.h:552 [inline] kzalloc /./include/linux/slab.h:748 [inline] bpf_int_jit_compile+0x1b2/0x7530 /arch/x86/net/bpf_jit_comp.c:1092 bpf_prog_select_runtime+0x756/0xa50 /kernel/bpf/core.c:1725 bpf_prog_load /kernel/bpf/syscall.c:1702 [inline] __do_sys_bpf+0x7d4e/0xc0e0 /kernel/bpf/syscall.c:2849 __se_sys_bpf /kernel/bpf/syscall.c:2808 [inline] __x64_sys_bpf+0x7a/0x90 /kernel/bpf/syscall.c:2808 do_syscall_64+0xfe/0x140 /arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 7329: save_stack /mm/kasan/common.c:69 [inline] set_track /mm/kasan/common.c:77 [inline] __kasan_slab_free+0x12a/0x1e0 /mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 /mm/kasan/common.c:457 __cache_free /mm/slab.c:3425 [inline] kfree+0x115/0x200 /mm/slab.c:3756 tomoyo_path_perm+0x6cc/0x8b0 /security/tomoyo/file.c:842 tomoyo_inode_getattr+0x1c/0x20 /security/tomoyo/tomoyo.c:129 security_inode_getattr+0xd5/0x150 /security/security.c:1182 vfs_getattr+0x2a/0x6d0 /fs/stat.c:115 vfs_statx /fs/stat.c:191 [inline] vfs_stat /./include/linux/fs.h:3182 [inline] __do_sys_newstat /fs/stat.c:341 [inline] __se_sys_newstat+0x10c/0x210 /fs/stat.c:337 __x64_sys_newstat+0x5b/0x70 /fs/stat.c:337 do_syscall_64+0xfe/0x140 /arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880960cc280 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 28 bytes to the right of 32-byte region [ffff8880960cc280, ffff8880960cc2a0) The buggy address belongs to the page: page:ffffea0002583300 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880960ccfc1 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00027f47c8 ffffea0002a53a48 ffff8880aa4001c0 raw: ffff8880960ccfc1 ffff8880960cc000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff8880960cc180: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8880960cc200: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc > ffff8880960cc280: 00 00 00 00 fc fc fc fc 00 00 fc fc fc fc fc fc ^ ffff8880960cc300: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc ffff8880960cc380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================
--- This bug 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.
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