diff options
author | Richard Weinberger <richard@nod.at> | 2013-05-12 17:26:03 -0400 |
---|---|---|
committer | Richard Weinberger <richard@nod.at> | 2013-07-19 04:45:17 -0400 |
commit | dee20035b42d569984d2c16041b51e4d75e233b5 (patch) | |
tree | 0364591da4cc991dff5f49feee8fff710a2ab458 | |
parent | 3179ce7254ffa43f3ba4409f31a954ecc4a8d408 (diff) |
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>
-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) | |||
123 | /* dup_mmap already holds mmap_sem */ | 123 | /* dup_mmap already holds mmap_sem */ |
124 | err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START, | 124 | err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START, |
125 | VM_READ | VM_MAYREAD | VM_EXEC | | 125 | VM_READ | VM_MAYREAD | VM_EXEC | |
126 | VM_MAYEXEC | VM_DONTCOPY, | 126 | VM_MAYEXEC | VM_DONTCOPY | VM_PFNMAP, |
127 | mm->context.stub_pages); | 127 | mm->context.stub_pages); |
128 | if (err) { | 128 | if (err) { |
129 | printk(KERN_ERR "install_special_mapping returned %d\n", err); | 129 | printk(KERN_ERR "install_special_mapping returned %d\n", err); |