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authorMasami Hiramatsu <mhiramat@kernel.org>2017-08-18 17:24:00 +0900
committerIngo Molnar <mingo@kernel.org>2017-09-28 09:23:03 +0200
commit63fef14fc98a8b4fad777fd3bef4d068802b3f14 (patch)
tree538f39c60c9eaafc7a88fc5c717f53f86cd02ec1 /kernel/kprobes.c
parent4f56186ec051033848a669f1b145162d1c53e854 (diff)
kprobes/x86: Make insn buffer always ROX and use text_poke()
Make insn buffer always ROX and use text_poke() to write the copied instructions instead of set_memory_*(). This makes instruction buffer stronger against other kernel subsystems because there is no window time to modify the buffer. Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: David S . Miller <davem@davemloft.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/150304463032.17009.14195368040691676813.stgit@devbox Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index a1606a4224e1..15fba7fe57c8 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -117,7 +117,7 @@ enum kprobe_slot_state {
SLOT_USED = 2,
};
-static void *alloc_insn_page(void)
+void __weak *alloc_insn_page(void)
{
return module_alloc(PAGE_SIZE);
}