mm: variable length argument support

Remove the arg+env limit of MAX_ARG_PAGES by copying the strings directly from
the old mm into the new mm.

We create the new mm before the binfmt code runs, and place the new stack at
the very top of the address space.  Once the binfmt code runs and figures out
where the stack should be, we move it downwards.

It is a bit peculiar in that we have one task with two mm's, one of which is
inactive.

[[email protected]: limit stack size]
Signed-off-by: Ollie Wild <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Cc: <[email protected]>
Cc: Hugh Dickins <[email protected]>
[[email protected]: unexport bprm_mm_init]
Signed-off-by: Adrian Bunk <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ollie Wild 2007-07-19 01:48:16 -07:00 • committed by Linus Torvalds
commit b6a2fea393
15 changed files with 554 additions and 453 deletions

View file

@ -120,7 +120,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
#define LATENCY_LIMIT (64 * PAGE_SIZE)
static unsigned long move_page_tables(struct vm_area_struct *vma,
unsigned long move_page_tables(struct vm_area_struct *vma,
unsigned long old_addr, struct vm_area_struct *new_vma,
unsigned long new_addr, unsigned long len)
{