linux-kernel - Re: [GIT PULL] blob-stacking updates for security-next

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Message-ID: <ce79cdd5-3020-8901-a5a4-ec42005734fd@I-love.SAKURA.ne.jp>
Date:   Fri, 11 Jan 2019 19:38:33 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Kees Cook <keescook@...omium.org>,
        James Morris <jmorris@...ei.org>,
        Casey Schaufler <casey@...aufler-ca.com>
Cc:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        John Johansen <john.johansen@...onical.com>,
        Mickaël Salaün <mic@...ikod.net>,
        Salvatore Mesoraca <s.mesoraca16@...il.com>
Subject: Re: [GIT PULL] blob-stacking updates for security-next

On 2019/01/09 6:35, Kees Cook wrote:
> Hi James,
> 
> Please pull these blob-stacking changes for security-next.
> 
> Thanks!
> 
> -Kees
> 
> The following changes since commit bfeffd155283772bbe78c6a05dec7c0128ee500c:
> 
>   Linux 5.0-rc1 (2019-01-06 17:08:20 -0800)
> 
> are available in the Git repository at:
> 
>   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git tags/blob-stacking-security-next
> 
> for you to fetch changes up to a5e2fe7ede1268d2f80fe49ca1f717d0e3750995:
> 
>   TOMOYO: Update LSM flags to no longer be exclusive (2019-01-08 13:18:45 -0800)
> 

And syzbot already found a bug.
This is occurring immediately after memory allocation failure for cred object.
We need to be prepared for free() function being called when alloc() function failed.

[   59.992498][ T8010] FAULT_INJECTION: forcing a failure.
[   59.992498][ T8010] name failslab, interval 1, probability 0, space 0, times 1
[   60.005214][ T8010] CPU: 0 PID: 8010 Comm: syz-executor178 Not tainted 5.0.0-rc1-next-20190111 #10
[   60.014337][ T8010] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   60.024383][ T8010] Call Trace:
[   60.027657][ T8010]  dump_stack+0x1db/0x2d0
[   60.063731][ T8010]  should_fail.cold+0xa/0x14
[   60.089894][ T8010]  __should_failslab+0x121/0x190
[   60.094810][ T8010]  should_failslab+0x9/0x14
[   60.099411][ T8010]  __kmalloc+0x2dc/0x740
[   60.124293][ T8010]  security_prepare_creds+0x123/0x190
[   60.129644][ T8010]  prepare_creds+0x3c4/0x510
[   60.149852][ T8010]  __x64_sys_capset+0x58c/0x9b0
[   60.185347][ T8010]  do_syscall_64+0x1a3/0x800
[   60.206747][ T8010]  entry_SYSCALL_64_after_hwframe+0x49/0xbe