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fs/exec.c: fix initial stack reservation

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803bf5ec25 ("fs/exec.c: restrict initial
stack space expansion to rlimit") attempts to limit the initial stack to
20*PAGE_SIZE.  Unfortunately, in attempting ensure the stack is not
reduced in size, we ended up not changing the stack at all.

This size reduction check is not necessary as the expand_stack call does
this already.

This caused a regression in UML resulting in most guest processes being
killed.

Signed-off-by: Michael Neuling <[email protected]>
Reviewed-by: KOSAKI Motohiro <[email protected]>
Acked-by: WANG Cong <[email protected]>
Cc: Anton Blanchard <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: James Morris <[email protected]>
Cc: Serge Hallyn <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Jouni Malinen <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michael Neuling 2010-02-22 12:44:24 -08:00 • committed by Linus Torvalds
commit a17e18790a
1 changed files with 0 additions and 1 deletions
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fs/exec.c
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@ -637,7 +637,6 @@ int setup_arg_pages(struct linux_binprm *bprm,
* will align it up.
*/
rlim_stack = rlimit(RLIMIT_STACK) & PAGE_MASK;
rlim_stack = min(rlim_stack, stack_size);
#ifdef CONFIG_STACK_GROWSUP
if (stack_size + stack_expand > rlim_stack)
stack_base = vma->vm_start + rlim_stack;