This is a note to let you know that I've just added the patch titled
Add a personality to report 2.6.x version numbers
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
add-a-personality-to-report-2.6.x-version-numbers.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <sta...@kernel.org> know about it.
>From be27425dcc516fd08245b047ea57f83b8f6f0903 Mon Sep 17 00:00:00 2001
From: Andi Kleen <a...@linux.intel.com>
Date: Fri, 19 Aug 2011 16:15:10 -0700
Subject: Add a personality to report 2.6.x version numbers
From: Andi Kleen <a...@linux.intel.com>
commit be27425dcc516fd08245b047ea57f83b8f6f0903 upstream.
I ran into a couple of programs which broke with the new Linux 3.0
version. Some of those were binary only. I tried to use LD_PRELOAD to
work around it, but it was quite difficult and in one case impossible
because of a mix of 32bit and 64bit executables.
For example, all kind of management software from HP doesnt work, unless
we pretend to run a 2.6 kernel.
$ uname -a
Linux svivoipvnx001 3.0.0-08107-g97cd98f #1062 SMP Fri Aug 12 18:11:45 CEST
2011 i686 i686 i386 GNU/Linux
$ hpacucli ctrl all show
Error: No controllers detected.
$ rpm -qf /usr/sbin/hpacucli
hpacucli-8.75-12.0
Another notable case is that Python now reports "linux3" from
sys.platform(); which in turn can break things that were checking
sys.platform() == "linux2":
https://bugzilla.mozilla.org/show_bug.cgi?id=664564
It seems pretty clear to me though it's a bug in the apps that are using
'==' instead of .startswith(), but this allows us to unbreak broken
programs.
This patch adds a UNAME26 personality that makes the kernel report a
2.6.40+x version number instead. The x is the x in 3.x.
I know this is somewhat ugly, but I didn't find a better workaround, and
compatibility to existing programs is important.
Some programs also read /proc/sys/kernel/osrelease. This can be worked
around in user space with mount --bind (and a mount namespace)
To use:
wget ftp://ftp.kernel.org/pub/linux/kernel/people/ak/uname26/uname26.c
gcc -o uname26 uname26.c
./uname26 program
Signed-off-by: Andi Kleen <a...@linux.intel.com>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
---
include/linux/personality.h | 1 +
kernel/sys.c | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
--- a/include/linux/personality.h
+++ b/include/linux/personality.h
@@ -22,6 +22,7 @@ extern int __set_personality(unsigned i
* These occupy the top three bytes.
*/
enum {
+ UNAME26 = 0x0020000,
ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA
space */
FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs
point to descriptors
* (signal handling)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -38,6 +38,8 @@
#include <linux/fs_struct.h>
#include <linux/gfp.h>
#include <linux/syscore_ops.h>
+#include <linux/version.h>
+#include <linux/ctype.h>
#include <linux/compat.h>
#include <linux/syscalls.h>
@@ -45,6 +47,8 @@
#include <linux/user_namespace.h>
#include <linux/kmsg_dump.h>
+/* Move somewhere else to avoid recompiling? */
+#include <generated/utsrelease.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -1124,6 +1128,34 @@ DECLARE_RWSEM(uts_sem);
#define override_architecture(name) 0
#endif
+/*
+ * Work around broken programs that cannot handle "Linux 3.0".
+ * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40
+ */
+static int override_release(char __user *release, int len)
+{
+ int ret = 0;
+ char buf[len];
+
+ if (current->personality & UNAME26) {
+ char *rest = UTS_RELEASE;
+ int ndots = 0;
+ unsigned v;
+
+ while (*rest) {
+ if (*rest == '.' && ++ndots >= 3)
+ break;
+ if (!isdigit(*rest) && *rest != '.')
+ break;
+ rest++;
+ }
+ v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40;
+ snprintf(buf, len, "2.6.%u%s", v, rest);
+ ret = copy_to_user(release, buf, len);
+ }
+ return ret;
+}
+
SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
{
int errno = 0;
@@ -1133,6 +1165,8 @@ SYSCALL_DEFINE1(newuname, struct new_uts
errno = -EFAULT;
up_read(&uts_sem);
+ if (!errno && override_release(name->release, sizeof(name->release)))
+ errno = -EFAULT;
if (!errno && override_architecture(name))
errno = -EFAULT;
return errno;
@@ -1154,6 +1188,8 @@ SYSCALL_DEFINE1(uname, struct old_utsnam
error = -EFAULT;
up_read(&uts_sem);
+ if (!error && override_release(name->release, sizeof(name->release)))
+ error = -EFAULT;
if (!error && override_architecture(name))
error = -EFAULT;
return error;
@@ -1188,6 +1224,8 @@ SYSCALL_DEFINE1(olduname, struct oldold_
if (!error && override_architecture(name))
error = -EFAULT;
+ if (!error && override_release(name->release, sizeof(name->release)))
+ error = -EFAULT;
return error ? -EFAULT : 0;
}
#endif
Patches currently in stable-queue which might be from a...@linux.intel.com are
queue-3.0/add-a-personality-to-report-2.6.x-version-numbers.patch
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