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memlock: allocate at most halve of rlimit stack

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Touch of stack allocation validated given size with rlimit
and if the reserved_stack was above rlimit, its been completely
ignored - now we will always touch stack upto rlimit/2 size.
This commit is contained in:
Zdenek Kabelac 2020-10-20 22:26:44 +02:00
parent bd272e3bce
commit fdec4cd3e6
1 changed files with 7 additions and 4 deletions
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11
lib/mm/memlock.c
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@ -167,10 +167,13 @@ static void _allocate_memory(void)
char *areas[max_areas];
/* Check if we could preallocate requested stack */
if ((getrlimit (RLIMIT_STACK, &limit) == 0) &&
((_size_stack * 2) < limit.rlim_cur) &&
((stack_mem = alloca(_size_stack))))
_touch_memory(stack_mem, _size_stack);
if (getrlimit(RLIMIT_STACK, &limit) == 0) {
limit.rlim_cur /= 2;
if (_size_stack > limit.rlim_cur)
_size_stack = limit.rlim_cur;
if ((stack_mem = alloca(_size_stack)))
_touch_memory(stack_mem, _size_stack);
}
/* FIXME else warn user setting got ignored */
/*