diff options
Diffstat (limited to 'toolchain/musl/patches/033-fix-undefined-behavior-in-sched.h-cpu_set_t-usage.patch')
| -rw-r--r-- | toolchain/musl/patches/033-fix-undefined-behavior-in-sched.h-cpu_set_t-usage.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/toolchain/musl/patches/033-fix-undefined-behavior-in-sched.h-cpu_set_t-usage.patch b/toolchain/musl/patches/033-fix-undefined-behavior-in-sched.h-cpu_set_t-usage.patch new file mode 100644 index 0000000000..c634d59e4b --- /dev/null +++ b/toolchain/musl/patches/033-fix-undefined-behavior-in-sched.h-cpu_set_t-usage.patch @@ -0,0 +1,43 @@ +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 |