Messages in this thread | | | Date | Wed, 18 Jul 2018 15:19:02 -0700 | Subject | KASAN: stack-out-of-bounds Read in bpf_tcp_close | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 8ae71e76cf1f Merge branch 'bpf-offload-sharing' git tree: bpf-next console output: https://syzkaller.appspot.com/x/log.txt?x=1379a978400000 kernel config: https://syzkaller.appspot.com/x/.config?x=89129667b46496c3 dashboard link: https://syzkaller.appspot.com/bug?extid=65a97319fd875ea52b73 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=114f4b2c400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1774932c400000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+65a97319fd875ea52b73@syzkaller.appspotmail.com
random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) IPVS: ftp: loaded support on port[0] = 21 ================================================================== swap_info_get: Bad swap file entry 8007fffc400d72b BUG: KASAN: stack-out-of-bounds in __read_once_size include/linux/compiler.h:188 [inline] BUG: KASAN: stack-out-of-bounds in smap_psock_sk kernel/bpf/sockmap.c:149 [inline] BUG: KASAN: stack-out-of-bounds in bpf_tcp_close+0xf10/0x1050 kernel/bpf/sockmap.c:316 Read of size 8 at addr ffff8801adcc4428 by task syz-executor115/24313 BUG: Bad page map in process syz-executor115 pte:1ffff10035cac810 pmd:1ae564067
CPU: 0 PID: 24313 Comm: syz-executor115 Not tainted 4.18.0-rc3+ #58 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace:
addr:(____ptrval____) vm_flags:00000875 anon_vma: (null) mapping:(____ptrval____) index:0 Allocated by task 2294230744: usercopy: Kernel memory overwrite attempt detected to SLAB object 'task_struct(17:syz0)' (offset 6088, size 2)! file:syz-executor115250413 fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage ------------[ cut here ]------------ Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected to SLAB object 'task_struct(17:syz0)' (offset 4936, size 2)! WARNING: CPU: 0 PID: 24313 at mm/usercopy.c:81 usercopy_warn+0xf5/0x120 mm/usercopy.c:76 CPU: 1 PID: 4479 Comm: syz-executor115 Not tainted 4.18.0-rc3+ #58 Kernel panic - not syncing: panic_on_warn set ...
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+0x1c9/0x2b4 lib/dump_stack.c:113 print_bad_pte.cold.116+0x1cd/0x22b mm/memory.c:774 zap_pte_range mm/memory.c:1380 [inline] zap_pmd_range mm/memory.c:1437 [inline] zap_pud_range mm/memory.c:1466 [inline] zap_p4d_range mm/memory.c:1487 [inline] unmap_page_range+0x1cb9/0x2220 mm/memory.c:1508 unmap_single_vma+0x1a0/0x310 mm/memory.c:1553 unmap_vmas+0x120/0x1f0 mm/memory.c:1583 exit_mmap+0x2c2/0x5b0 mm/mmap.c:3105 __mmput kernel/fork.c:970 [inline] mmput+0x265/0x620 kernel/fork.c:991 exit_mm kernel/exit.c:544 [inline] do_exit+0xea9/0x2750 kernel/exit.c:852 do_group_exit+0x177/0x440 kernel/exit.c:968 get_signal+0x88e/0x1970 kernel/signal.c:2468 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e0/0x370 arch/x86/entry/common.c:162 prepare_exit_to_usermode+0x342/0x3b0 arch/x86/entry/common.c:197 retint_user+0x8/0x18 RIP: 0033:0x4731e0 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 RSP: 002b:00007ffd426a9928 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000002e7e RCX: 00000000004731e0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffd426a9930 RBP: 0000000000002e7e R08: 0000000000000001 R09: 0000000000e2a880 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000f7e R13: 000000000003ab5f R14: 0000000000000000 R15: 0000000000000000 CPU: 0 PID: 24313 Comm: syz-executor115 Not tainted 4.18.0-rc3+ #58 swap_info_get: Bad swap file entry 403fffe200725fc Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..
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