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um: Ensure that a stub page cannot get unmapped

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Trinity discovered an execution path such that a task
can unmap his stub page.

Reported-by: Toralf Förster <toralf.foerster@gmx.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger 2014-07-20 13:09:15 +02:00
parent ae5db6d123
commit 284e6d3951
1 changed files with 3 additions and 0 deletions
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3
arch/um/kernel/tlb.c
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@ -124,6 +124,9 @@ static int add_munmap(unsigned long addr, unsigned long len,
struct host_vm_op *last;
int ret = 0;
if ((addr >= STUB_START) && (addr < STUB_END))
return -EINVAL;
if (hvc->index != 0) {
last = &hvc->ops[hvc->index - 1];
if ((last->type == MUNMAP) &&