linux-kernel - RE: [PATCH 0/5] cramfs refresh for embedded usage

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

Message-ID: <SG2PR06MB1165749BD3C8336AB0CD27618A8D0@SG2PR06MB1165.apcprd06.prod.outlook.com>
Date:   Tue, 15 Aug 2017 11:00:49 +0000
From:   Chris Brandt <Chris.Brandt@...esas.com>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
CC:     Alexander Viro <viro@...iv.linux.org.uk>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-embedded@...r.kernel.org" <linux-embedded@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/5] cramfs refresh for embedded usage

On Tuesday, August 15, 2017 1, Nicolas Pitre wrote:
> I was able to reproduce. The following patch on top should partially fix
> it.  I'm trying to figure out how to split a vma and link it properly in
> the case the vma cannot be mapped entirely. In the mean time shared libs
> won't be XIP.
> 
> 
> diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
> index 5aedbd224e..4c7f01fcd2 100644
> --- a/fs/cramfs/inode.c
> +++ b/fs/cramfs/inode.c


Yes, now I can boot with my rootfs being a XIP cramfs.

However, like you said, libc is not XIP.

$ cat /proc/self/maps
00008000-000a1000 r-xp 1b005000 00:0c 18192      /bin/busybox
000a9000-000aa000 rw-p 00099000 00:0c 18192      /bin/busybox
000aa000-000ac000 rw-p 00000000 00:00 0          [heap]
b6ed8000-b6fb1000 r-xp 00000000 00:0c 766540     /lib/libc-2.18-2013.10.so
b6fb1000-b6fb9000 ---p 000d9000 00:0c 766540     /lib/libc-2.18-2013.10.so
b6fb9000-b6fbb000 r--p 000d9000 00:0c 766540     /lib/libc-2.18-2013.10.so
b6fbb000-b6fbc000 rw-p 000db000 00:0c 766540     /lib/libc-2.18-2013.10.so
b6fbc000-b6fbf000 rw-p 00000000 00:00 0
b6fbf000-b6fd6000 r-xp 00000000 00:0c 670372     /lib/ld-2.18-2013.10.so
b6fd9000-b6fda000 rw-p 00000000 00:00 0
b6fdb000-b6fdd000 rw-p 00000000 00:00 0
b6fdd000-b6fde000 r--p 00016000 00:0c 670372     /lib/ld-2.18-2013.10.so
b6fde000-b6fdf000 rw-p 00017000 00:0c 670372     /lib/ld-2.18-2013.10.so
be81f000-be840000 rw-p 00000000 00:00 0          [stack]
beb19000-beb1a000 r-xp 00000000 00:00 0          [sigpage]
ffff0000-ffff1000 r-xp 00000000 00:00 0          [vectors]


Chris