linux/arch
Kees Cook 9dd721c6db x86, kaslr: fix module lock ordering problem
There was a potential lock ordering problem with the module kASLR patch
("x86, kaslr: randomize module base load address"). This patch removes
the usage of the module_mutex and creates a new mutex to protect the
module base address offset value.

Chain exists of:
  text_mutex --> kprobe_insn_slots.mutex --> module_mutex

[    0.515561]  Possible unsafe locking scenario:
[    0.515561]
[    0.515561]        CPU0                    CPU1
[    0.515561]        ----                    ----
[    0.515561]   lock(module_mutex);
[    0.515561]                                lock(kprobe_insn_slots.mutex);
[    0.515561]                                lock(module_mutex);
[    0.515561]   lock(text_mutex);
[    0.515561]
[    0.515561]  *** DEADLOCK ***

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Andy Honig <ahonig@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2014-03-24 10:18:26 -07:00
..
alpha alpha: fix broken network checksum 2014-01-31 09:21:55 -08:00
arc Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-01-30 16:58:05 -08:00
arm ARM: SoC fixes for 3.14-rc 2014-02-23 17:38:04 -08:00
arm64 A small error handling problem and a compile breakage for ARM64. 2014-02-14 11:10:49 -08:00
avr32 avr32: add generic vga.h to Kbuild 2014-02-17 11:24:48 +01:00
blackfin Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-01-31 09:31:14 -08:00
c6x
cris CRIS correction for 3.14 2014-01-28 09:01:14 -08:00
frv Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-01-30 16:58:05 -08:00
hexagon Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-01-25 11:17:34 -08:00
ia64 [IA64] Wire up new sched_setattr and sched_getattr syscalls 2014-01-28 09:52:53 -08:00
m32r Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-01-25 11:17:34 -08:00
m68k Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block 2014-01-30 11:19:05 -08:00
metag Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-01-25 11:17:34 -08:00
microblaze microblaze: Fix a typo when disabling stack protection 2014-02-10 07:44:11 +01:00
mips MIPS: fpu.h: Fix build when CONFIG_BUG is not set 2014-02-06 13:42:43 +01:00
mn10300 Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-01-30 16:58:05 -08:00
openrisc OpenRISC updates for 3.14 2014-01-30 17:08:41 -08:00
parisc execve: use 'struct filename *' for executable name passing 2014-02-05 12:54:53 -08:00
powerpc powerpc/eeh: Disable EEH on reboot 2014-02-17 11:19:39 +11:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2014-02-11 12:23:50 -08:00
score Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-01-31 09:31:14 -08:00
sh Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-01-25 11:17:34 -08:00
sparc sparc32: make copy_to/from_user_page() usable from modular code 2014-02-19 19:49:48 -05:00
tile tile: remove compat_sys_lookup_dcookie declaration to fix compile error 2014-02-01 10:55:15 -08:00
um Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml 2014-01-26 11:06:16 -08:00
unicore32 arch/unicore32/kernel/early_printk.c:setup_early_printk: missing initialization 2014-01-27 21:02:39 -08:00
x86 x86, kaslr: fix module lock ordering problem 2014-03-24 10:18:26 -07:00
xtensa Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block 2014-01-30 11:19:05 -08:00
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