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authorMasami Hiramatsu <mhiramat@kernel.org>2017-05-25 19:38:17 +0900
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-05-26 22:37:00 -0400
commitc93f5cf571e7795f97d49ef51b766cf25e328545 (patch)
treedbe64f0e9bf5a26ece23376aa925a8c13be817fe /kernel/kprobes.c
parentf9797c2f20c0160edd718aa467101f3301e57e59 (diff)
kprobes/x86: Fix to set RWX bits correctly before releasing trampoline
Fix kprobes to set(recover) RWX bits correctly on trampoline buffer before releasing it. Releasing readonly page to module_memfree() crash the kernel. Without this fix, if kprobes user register a bunch of kprobes in function body (since kprobes on function entry usually use ftrace) and unregister it, kernel hits a BUG and crash. Link: http://lkml.kernel.org/r/149570868652.3518.14120169373590420503.stgit@devbox Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Fixes: d0381c81c2f7 ("kprobes/x86: Set kprobes pages read-only") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.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 2d2d3a568e4e..adfe3b4cfe05 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -122,7 +122,7 @@ static void *alloc_insn_page(void)
return module_alloc(PAGE_SIZE);
}
-static void free_insn_page(void *page)
+void __weak free_insn_page(void *page)
{
module_memfree(page);
}