[PATCH] tomoyo: Add a kernel config option for fuzzing testing.

[Tetsuo Handa]

James, please include this patch for 5.1-rc1, for failing to include
this patch will prevent various trees (SELinux/Smack/AppArmor) from
proper testing due to this problem because syzbot is enabling both
TOMOYO and one of SELinux/Smack/AppArmor via lsm= boot parameter.

By including this patch and building kernels with this config option
enabled, syzbot will be able to continue proper testing.

On 2019/02/28 23:06, Tetsuo Handa wrote:
> syzbot is reporting kernel panic triggered by memory allocation fault
> injection before loading TOMOYO's policy [1]. To make the fuzzing tests
> useful, we need to assign a profile other than "disabled" (no-op) mode.
> Therefore, let's allow syzbot to load TOMOYO's built-in policy for
> "learning" mode using a kernel config option. This option must not be
> enabled for kernels built for production system, for this option also
> disables domain/program checks when modifying policy configuration via
> /sys/kernel/security/tomoyo/ interface.
> 
> [1] https://syzkaller.appspot.com/bug?extid=29569ed06425fcf67a95
> 
> Reported-by: syzbot <syzbot+e1b8084e532b6ee7afab at syzkaller.appspotmail.com>
> Reported-by: syzbot <syzbot+29569ed06425fcf67a95 at syzkaller.appspotmail.com>
> Signed-off-by: Tetsuo Handa <penguin-kernel at I-love.SAKURA.ne.jp>
> ---
>  security/tomoyo/Kconfig  | 10 ++++++++++
>  security/tomoyo/common.c | 13 ++++++++++++-
>  2 files changed, 22 insertions(+), 1 deletion(-)
>