On Sun, Feb 7, 2021 at 1:20 PM syzbot <syzbot+580f4f2a272e452d5...@syzkaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 73d62e81 kmsan: random: prevent boot-time reports in _mix_.. > git tree: https://github.com/google/kmsan.git master > console output: https://syzkaller.appspot.com/x/log.txt?x=17ac5f64d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=df698232b2ac45c9 > dashboard link: https://syzkaller.appspot.com/bug?extid=580f4f2a272e452d55cb > compiler: Debian clang version 11.0.1-2 > userspace arch: i386 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+580f4f2a272e452d5...@syzkaller.appspotmail.com
+BPF maintainers > ===================================================== > BUG: KMSAN: uninit-value in bpf_iter_prog_supported+0x3dd/0x6a0 > syzkaller/managers/upstream-kmsan-gce-386/kernel/kernel/bpf/bpf_iter.c:329 > CPU: 0 PID: 18494 Comm: bpf_preload Not tainted 5.10.0-rc4-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack > syzkaller/managers/upstream-kmsan-gce-386/kernel/lib/dump_stack.c:77 [inline] > dump_stack+0x21c/0x280 > syzkaller/managers/upstream-kmsan-gce-386/kernel/lib/dump_stack.c:118 > kmsan_report+0xfb/0x1e0 > syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/kmsan/kmsan_report.c:118 > __msan_warning+0x5f/0xa0 > syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/kmsan/kmsan_instr.c:197 > bpf_iter_prog_supported+0x3dd/0x6a0 > syzkaller/managers/upstream-kmsan-gce-386/kernel/kernel/bpf/bpf_iter.c:329 > check_attach_btf_id > syzkaller/managers/upstream-kmsan-gce-386/kernel/kernel/bpf/verifier.c:11772 > [inline] > bpf_check+0x11872/0x1c380 > syzkaller/managers/upstream-kmsan-gce-386/kernel/kernel/bpf/verifier.c:11900 > bpf_prog_load > syzkaller/managers/upstream-kmsan-gce-386/kernel/kernel/bpf/syscall.c:2210 > [inline] > __do_sys_bpf+0x17483/0x1aee0 > syzkaller/managers/upstream-kmsan-gce-386/kernel/kernel/bpf/syscall.c:4399 > __se_sys_bpf+0x8e/0xa0 > syzkaller/managers/upstream-kmsan-gce-386/kernel/kernel/bpf/syscall.c:4357 > __x64_sys_bpf+0x4a/0x70 > syzkaller/managers/upstream-kmsan-gce-386/kernel/kernel/bpf/syscall.c:4357 > do_syscall_64+0x9f/0x140 > syzkaller/managers/upstream-kmsan-gce-386/kernel/arch/x86/entry/common.c:48 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > RIP: 0033:0x7fb70b5ab469 > Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 8b 0d ff 49 2b 00 f7 d8 64 89 01 48 > RSP: 002b:00007ffdbb4cde38 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 > RAX: ffffffffffffffda RBX: 000000000065b110 RCX: 00007fb70b5ab469 > RDX: 0000000000000078 RSI: 00007ffdbb4cdef0 RDI: 0000000000000005 > RBP: 00007ffdbb4cdef0 R08: 0000001000000017 R09: 0000000000000000 > R10: 00007ffdbb4ce0e8 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007ffdbb4cdf20 R14: 0000000000000000 R15: 0000000000000000 > > Uninit was created at: > kmsan_save_stack_with_flags > syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/kmsan/kmsan.c:121 [inline] > kmsan_internal_poison_shadow+0x5c/0xf0 > syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/kmsan/kmsan.c:104 > kmsan_slab_alloc+0x8d/0xe0 > syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/kmsan/kmsan_hooks.c:76 > slab_alloc_node > syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:2906 [inline] > slab_alloc syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:2915 > [inline] > kmem_cache_alloc_trace+0x893/0x1000 > syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:2932 > kmalloc > syzkaller/managers/upstream-kmsan-gce-386/kernel/./include/linux/slab.h:552 > [inline] > bpf_iter_reg_target+0x81/0x3f0 > syzkaller/managers/upstream-kmsan-gce-386/kernel/kernel/bpf/bpf_iter.c:276 > bpf_sk_storage_map_iter_init+0x6a/0x85 > syzkaller/managers/upstream-kmsan-gce-386/kernel/net/core/bpf_sk_storage.c:870 > do_one_initcall+0x362/0x8d0 > syzkaller/managers/upstream-kmsan-gce-386/kernel/init/main.c:1220 > do_initcall_level+0x1e7/0x35a > syzkaller/managers/upstream-kmsan-gce-386/kernel/init/main.c:1293 > do_initcalls+0x127/0x1cb > syzkaller/managers/upstream-kmsan-gce-386/kernel/init/main.c:1309 > do_basic_setup+0x33/0x36 > syzkaller/managers/upstream-kmsan-gce-386/kernel/init/main.c:1329 > kernel_init_freeable+0x238/0x38b > syzkaller/managers/upstream-kmsan-gce-386/kernel/init/main.c:1529 > kernel_init+0x1f/0x840 > syzkaller/managers/upstream-kmsan-gce-386/kernel/init/main.c:1418 > ret_from_fork+0x1f/0x30 > syzkaller/managers/upstream-kmsan-gce-386/kernel/arch/x86/entry/entry_64.S:296 > ===================================================== > > > --- > 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 syzkal...@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000364d5505babe13f5%40google.com.
