[PATCH] fix infoleak in mm

From	Kangjie Lu <kangjielu@gmail.com>
Newsgroups	linux.kernel
Subject	[PATCH] fix infoleak in mm
Date	2016-05-03 22:40 +0200
Message-ID	<ruPgR-6BH-5@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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The stack object “si” has a total size of 128; however, only 20
bytes are initialized. The remaining uninitialized bytes are sent
to userland via send_signal

Signed-off-by: Kangjie Lu <kjlu@gatech.edu>
---
 arch/arm64/mm/fault.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 95df28b..f790eda 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -117,6 +117,7 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
 {
 	struct siginfo si;
 
+	memset(&si, 0, sizeof(si));
 	if (unhandled_signal(tsk, sig) && show_unhandled_signals_ratelimited()) {
 		pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
 			tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
-- 
1.9.1

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[PATCH] fix infoleak in mm Kangjie Lu <kangjielu@gmail.com> - 2016-05-03 22:40 +0200
  Re: [PATCH] fix infoleak in mm Catalin Marinas <catalin.marinas@arm.com> - 2016-05-04 12:40 +0200

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