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posix_spawn: fix stack setup on ia64 [BZ #21275]

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The ia64-specific clone2 call expects the base of the stack mapping and
the stack size as sep arguments, not an initial stack value as on other
stack-grows-down architectures.  Reuse the stack-grows-up macro so we
pass in the right stack base.

Reported-by: Matt Turner <mattst88@gentoo.org>
This commit is contained in:
Mike Frysinger
2017-03-20 04:47:56 -04:00
parent 15e9a4f378
commit ddc3fb3334
2 changed files with 14 additions and 5 deletions
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11
sysdeps/unix/sysv/linux/spawni.c
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@ -61,17 +61,18 @@
#define SPAWN_ERROR 127
#ifdef __ia64__
# define CLONE(__fn, __stack, __stacksize, __flags, __args) \
__clone2 (__fn, __stack, __stacksize, __flags, __args, 0, 0, 0)
# define CLONE(__fn, __stackbase, __stacksize, __flags, __args) \
__clone2 (__fn, __stackbase, __stacksize, __flags, __args, 0, 0, 0)
#else
# define CLONE(__fn, __stack, __stacksize, __flags, __args) \
__clone (__fn, __stack, __flags, __args)
#endif
#if _STACK_GROWS_DOWN
# define STACK(__stack, __stack_size) (__stack + __stack_size)
#elif _STACK_GROWS_UP
/* Since ia64 wants the stackbase w/clone2, re-use the grows-up macro. */
#if _STACK_GROWS_UP || defined (__ia64__)
# define STACK(__stack, __stack_size) (__stack)
#elif _STACK_GROWS_DOWN
# define STACK(__stack, __stack_size) (__stack + __stack_size)
#endif