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Commit dee20035 authored by Richard Weinberger's avatar Richard Weinberger
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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: default avatar <toralf.foerster@gmx.de>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 3179ce72

arch/um/kernel/skas/mmu.c

+1 −1
Original line number Diff line number Diff line
@@ -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);