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| author | Richard Weinberger <richard@nod.at> | 2013-05-12 23:26:03 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2013-07-19 10:45:17 +0200 |
| commit | dee20035b42d569984d2c16041b51e4d75e233b5 (patch) | |
| tree | 0364591da4cc991dff5f49feee8fff710a2ab458 /arch | |
| parent | um: Fix return value of strnlen_user() (diff) | |
| download | linux-dee20035b42d569984d2c16041b51e4d75e233b5.tar.xz linux-dee20035b42d569984d2c16041b51e4d75e233b5.zip | |
um: Mark stub pages mapping with VM_PFNMAP
Ensure that a process cannot destroy his stub pages with
using MADV_DONTNEED and friends.
Reported-by: toralf.foerster@gmx.de
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/um/kernel/skas/mmu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c index ff03067a3b14..007d5503f49b 100644 --- a/arch/um/kernel/skas/mmu.c +++ b/arch/um/kernel/skas/mmu.c @@ -123,7 +123,7 @@ void uml_setup_stubs(struct mm_struct *mm) /* dup_mmap already holds mmap_sem */ err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START, VM_READ | VM_MAYREAD | VM_EXEC | - VM_MAYEXEC | VM_DONTCOPY, + VM_MAYEXEC | VM_DONTCOPY | VM_PFNMAP, mm->context.stub_pages); if (err) { printk(KERN_ERR "install_special_mapping returned %d\n", err); |