This is a note to let you know that I've just added the patch titled
um: Fix possible deadlock in sig_handler_common()
to the 4.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
um-fix-possible-deadlock-in-sig_handler_common.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 57a05d83b16710aff30510c33768df7ab17e0b4a Mon Sep 17 00:00:00 2001
From: Richard Weinberger <richard@xxxxxx>
Date: Sun, 12 Jun 2016 22:03:16 +0200
Subject: um: Fix possible deadlock in sig_handler_common()
From: Richard Weinberger <richard@xxxxxx>
commit 57a05d83b16710aff30510c33768df7ab17e0b4a upstream.
We are in atomic context and must not sleep.
Sleeping here is possible since malloc() maps
to kmalloc() with GFP_KERNEL.
Fixes: b6024b21 ("um: extend fpstate to _xstate to support YMM registers")
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/um/os-Linux/signal.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -15,6 +15,7 @@
#include <kern_util.h>
#include <os.h>
#include <sysdep/mcontext.h>
+#include <um_malloc.h>
void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
[SIGTRAP] = relay_signal,
@@ -32,7 +33,7 @@ static void sig_handler_common(int sig,
struct uml_pt_regs *r;
int save_errno = errno;
- r = malloc(sizeof(struct uml_pt_regs));
+ r = uml_kmalloc(sizeof(struct uml_pt_regs), UM_GFP_ATOMIC);
if (!r)
panic("out of memory");
@@ -91,7 +92,7 @@ static void timer_real_alarm_handler(mco
{
struct uml_pt_regs *regs;
- regs = malloc(sizeof(struct uml_pt_regs));
+ regs = uml_kmalloc(sizeof(struct uml_pt_regs), UM_GFP_ATOMIC);
if (!regs)
panic("out of memory");
Patches currently in stable-queue which might be from richard@xxxxxx are
queue-4.7/um-fix-possible-deadlock-in-sig_handler_common.patch
queue-4.7/ubi-fix-race-condition-between-ubi-device-creation-and-udev.patch
queue-4.7/ubi-fix-early-logging.patch
queue-4.7/ubi-make-volume-resize-power-cut-aware.patch
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