2912f9f2a2
Backport most important fixes up to latest HEAD - Taken post-commit reverts/fixes into account Compile tested Run-tested on cns3xxx & imx6 targets Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
43 lines
1.7 KiB
Diff
43 lines
1.7 KiB
Diff
From 66570ec9c465e3c6c5d6dbd7dd42e45041a39288 Mon Sep 17 00:00:00 2001
|
|
From: Rich Felker <dalias@aerifal.cx>
|
|
Date: Mon, 19 Sep 2016 11:15:51 -0400
|
|
Subject: fix undefined behavior in sched.h cpu_set_t usage
|
|
|
|
since cpu sets can be dynamically allocated and have variable size,
|
|
accessing their contents via ->__bits is not valid; performing pointer
|
|
arithmetic outside the range of the size of the declared __bits array
|
|
results in undefined beahavior. instead, only use cpu_set_t for
|
|
fixed-size cpu set objects (instantiated by the caller) and as an
|
|
abstract pointer type for dynamically allocated ones. perform all
|
|
accesses simply by casting the abstract pointer type cpuset_t * back
|
|
to unsigned long *.
|
|
---
|
|
include/sched.h | 6 +++---
|
|
1 file changed, 3 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/include/sched.h b/include/sched.h
|
|
index af82d6c..d1cccb7 100644
|
|
--- a/include/sched.h
|
|
+++ b/include/sched.h
|
|
@@ -82,7 +82,7 @@ int sched_getaffinity(pid_t, size_t, cpu_set_t *);
|
|
int sched_setaffinity(pid_t, size_t, const cpu_set_t *);
|
|
|
|
#define __CPU_op_S(i, size, set, op) ( (i)/8U >= (size) ? 0 : \
|
|
- ((set)->__bits[(i)/8/sizeof(long)] op (1UL<<((i)%(8*sizeof(long))))) )
|
|
+ (((unsigned long *)(set))[(i)/8/sizeof(long)] op (1UL<<((i)%(8*sizeof(long))))) )
|
|
|
|
#define CPU_SET_S(i, size, set) __CPU_op_S(i, size, set, |=)
|
|
#define CPU_CLR_S(i, size, set) __CPU_op_S(i, size, set, &=~)
|
|
@@ -94,8 +94,8 @@ static __inline void __CPU_##func##_S(size_t __size, cpu_set_t *__dest, \
|
|
{ \
|
|
size_t __i; \
|
|
for (__i=0; __i<__size/sizeof(long); __i++) \
|
|
- __dest->__bits[__i] = __src1->__bits[__i] \
|
|
- op __src2->__bits[__i] ; \
|
|
+ ((unsigned long *)__dest)[__i] = ((unsigned long *)__src1)[__i] \
|
|
+ op ((unsigned long *)__src2)[__i] ; \
|
|
}
|
|
|
|
__CPU_op_func_S(AND, &)
|
|
--
|
|
cgit v0.11.2
|