Re: KMSAN: uninit-value in af_alg_free_areq_sgls

On Fri, Jul 6, 2018 at 10:09 AM, syzbot
[off-list ref] wrote:

Hello,

syzbot tried to test the proposed patch but build/boot failed:

lost connection to test machine

Looking into this.

[....] Starting enhanced syslogd: rsyslogd [?25l [?1c 7 [1G[ [32m ok [39;49m
8 [?25h [?0c.
[....] Starting periodic command scheduler: cron [?25l [?1c 7 [1G[ [32m ok
[39;49m 8 [?25h [?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.709280] random:
sshd: uninitialized urandom read (32 bytes read)
[?25l [?1c 7 [1G[ [32m ok  [39;49m 8 [?25h [?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   26.229113] random: sshd: uninitialized urandom read (32
bytes read)
[   26.532843] random: sshd: uninitialized urandom read (32 bytes read)
[   27.787277] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts.
[   33.299368] random: sshd: uninitialized urandom read (32 bytes read)
flag provided but not defined: -os
Usage of ./syz-fuzzer:
  -abort_signal int
        initial signal to send to executor in error conditions; upgrades to
SIGKILL if executor does not exit
  -arch string
        target arch (default "amd64")
  -buffer_size uint
        internal buffer size (in bytes) for executor output
  -collide
        collide syscalls to provoke data races (default true)
  -cover
        collect feedback signals (coverage)
  -debug
        debug output from executor
  -executor string
        path to executor binary (default "./syz-executor")
  -ipc string
        ipc scheme (pipe/shmem)
  -leak
        detect memory leaks
  -manager string
        manager rpc address
  -name string
        unique name for manager (default "test")
  -output string
        write programs to none/stdout/dmesg/file (default "stdout")
  -pprof string
        address to serve pprof profiles
  -procs int
        number of parallel test processes (default 1)
  -sandbox string
        sandbox for fuzzing (none/setuid/namespace) (default "none")
  -test
        enable image testing mode
  -threaded
        use threaded mode in executor (default true)
  -timeout duration
        execution timeout
  -v int
        verbosity



Tested on:

commit:         9c9df9f275f0 kmsan: remove kmsan_threads_ready
git tree:       https://github.com/google/kmsan.git/master
kernel config:  https://syzkaller.appspot.com/x/.config?x=b11f4cfb262ee607
compiler:       clang version 7.0.0 (trunk 334104)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16a5af84400000

--
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+unsubscribe@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/syzkaller-bugs/000000000000363e2e0570502d42%40google.com.

For more options, visit https://groups.google.com/d/optout.