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um: Fix possible deadlock in sig_handler_common() 

We are in atomic context and must not sleep.
Sleeping here is possible since malloc() maps
to kmalloc() with GFP_KERNEL.

Cc: stable@vger.kernel.org
Fixes: b6024b21 ("um: extend fpstate to _xstate to support YMM registers")
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger 2016-06-12 22:03:16 +02:00
parent 5609a3d309
commit 57a05d83b1
1 changed files with 3 additions and 2 deletions
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5
arch/um/os-Linux/signal.c
View File

@ -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 siginfo *si, mcontext_t *mc)
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(mcontext_t *mc)
{
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");