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Fix getting tunable values on big-endian (BZ #21109)

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The code to set value passed a tunable_val_t, which when cast to
int32_t on big-endian gives the wrong value.  Instead, use
tunable_val_t.numval instead, which can then be safely cast into
int32_t.
This commit is contained in:
Siddhesh Poyarekar 2017-02-08 11:18:23 +05:30
parent 3f67d1a702
commit 8cbc826c37
4 changed files with 18 additions and 6 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2017-02-08 Siddhesh Poyarekar <siddhesh@sourceware.org>
[BZ #21109]
* elf/dl-tunable-types.h (tunable_callback_t): Accept
tunable_val_t as argument.
* elf/dl-tunables.c (__tunable_set_val): Add comment.
* malloc/arena.c (set_mallopt_check): Take tunable_val_t as
argument.
(DL_TUNABLE_CALLBACK_FNDECL): Likewise.
2017-02-08 Kir Kolyshkin <kir@openvz.org>
* sysdeps/unix/sysv/linux/aarch64/sys/ptrace.h (__ptrace_eventcodes):

4
elf/dl-tunable-types.h
View file

@ -21,8 +21,6 @@
# define _TUNABLE_TYPES_H_
#include <stddef.h>
typedef void (*tunable_callback_t) (void *);
typedef enum
{
TUNABLE_TYPE_INT_32,
@ -43,6 +41,8 @@ typedef union
const char *strval;
} tunable_val_t;
typedef void (*tunable_callback_t) (tunable_val_t *);
/* Security level for tunables. This decides what to do with individual
tunables for AT_SECURE binaries. */
typedef enum

2
elf/dl-tunables.c
View file

@ -455,6 +455,8 @@ __tunable_set_val (tunable_id_t id, void *valp, tunable_callback_t callback)
if (cur->strval == NULL)
return;
/* Caller does not need the value, just call the callback with our tunable
value. */
if (valp == NULL)
goto cb;

8
malloc/arena.c
View file

@ -212,9 +212,9 @@ __malloc_fork_unlock_child (void)
#if HAVE_TUNABLES
static inline int do_set_mallopt_check (int32_t value);
void
DL_TUNABLE_CALLBACK (set_mallopt_check) (void *valp)
DL_TUNABLE_CALLBACK (set_mallopt_check) (tunable_val_t *valp)
{
int32_t value = *(int32_t *) valp;
int32_t value = (int32_t) valp->numval;
do_set_mallopt_check (value);
if (check_action != 0)
__malloc_check_init ();
@ -223,9 +223,9 @@ DL_TUNABLE_CALLBACK (set_mallopt_check) (void *valp)
# define DL_TUNABLE_CALLBACK_FNDECL(__name, __type) \
static inline int do_ ## __name (__type value); \
void \
DL_TUNABLE_CALLBACK (__name) (void *valp) \
DL_TUNABLE_CALLBACK (__name) (tunable_val_t *valp) \
{ \
__type value = *(__type *) valp; \
__type value = (__type) (valp)->numval; \
do_ ## __name (value); \
}