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authorKees Cook <keescook@chromium.org>2014-03-10 13:42:48 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2014-03-24 10:18:26 -0700
commit9dd721c6dbfc310f94306902611f86dda87a45fa (patch)
tree56dbfcb8ae3c05f26be75dba824c5fb18b1ac25f /scripts/ld-version.sh
parente2b32e6785138d92d2a40e0d0473575c8c7310a2 (diff)
downloadlinux-9dd721c6dbfc310f94306902611f86dda87a45fa.tar.gz
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>
Diffstat (limited to 'scripts/ld-version.sh')
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