linux-kernel - [ 81/94] x86, relocs: Add jiffies and jiffies

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: <20120527010435.176665787@linuxfoundation.org>
Date:	Sun, 27 May 2012 10:05:44 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Stephen Rothwell <sfr@...b.auug.org.au>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [ 81/94] x86, relocs: Add jiffies and jiffies_64 to the relative whitelist

3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "H. Peter Anvin" <hpa@...or.com>

commit ea17e7414bc62e8d3bde8d08e3df1d921c518c17 upstream.

The symbol jiffies is created in the linker script as an alias to
jiffies_64.  Unfortunately this is done outside any section, and
apparently GNU ld 2.21 doesn't carry the section with it, so we end up
with an absolute symbol and therefore a broken kernel.

Add jiffies and jiffies_64 to the whitelist.

The most disturbing bit with this discovery is that it shows that we
have had multiple linker bugs in this area crossing multiple
generations, and have been silently building bad kernels for some time.

Link: http://lkml.kernel.org/r/20120524171604.0d98284f3affc643e9714470@canb.auug.org.au
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/tools/relocs.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -71,6 +71,7 @@ static const char * const sym_regex_kern
 	"__(start|stop)_notes|"
 	"__end_rodata|"
 	"__initramfs_start|"
+	"(jiffies|jiffies_64)|"
 	"_end)$"
 };

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/