linux-kernel - Re: [PATCH stable 4.4] powerpc/lib: fix book3s/32 boot failure due to code patching

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190515141604.GB8999@kroah.com>
Date:   Wed, 15 May 2019 16:16:04 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, erhard_f@...lbox.org,
        Michael Neuling <mikey@...ling.org>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH stable 4.4] powerpc/lib: fix book3s/32 boot failure due
 to code patching

On Wed, May 15, 2019 at 01:30:42PM +0000, Christophe Leroy wrote:
> [Backport of upstream commit b45ba4a51cde29b2939365ef0c07ad34c8321789]
> 
> On powerpc32, patch_instruction() is called by apply_feature_fixups()
> which is called from early_init()
> 
> There is the following note in front of early_init():
>  * Note that the kernel may be running at an address which is different
>  * from the address that it was linked at, so we must use RELOC/PTRRELOC
>  * to access static data (including strings).  -- paulus
> 
> Therefore init_mem_is_free must be accessed with PTRRELOC()
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=203597
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> 
> ---
> Can't apply the upstream commit as such due to several other unrelated stuff
> like for instance STRICT_KERNEL_RWX which are missing.
> So instead, using same approach as for commit 252eb55816a6f69ef9464cad303cdb3326cdc61d
> 
> Removed the Fixes: tag as I don't know yet the commit Id of the fixed commit on 4.4 branch.
> ---
>  arch/powerpc/lib/code-patching.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Now added, thanks.

greg k-h