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| author | Joerg Roedel <jroedel@suse.de> | 2018-04-16 11:43:57 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-16 11:20:34 -0700 |
| commit | e6f39e87b6439939a14cb7fdd94086a082b63b87 (patch) | |
| tree | 6df2d211a3e49359466e8b0dd3183a5d2d285495 /arch | |
| parent | 60cc43fc888428bb2f18f08997432d426a243338 (diff) | |
| download | linux-e6f39e87b6439939a14cb7fdd94086a082b63b87.tar.bz2 | |
x86/ldt: Fix support_pte_mask filtering in map_ldt_struct()
The |= operator will let us end up with an invalid PTE. Use
the correct &= instead.
[ The bug was also independently reported by Shuah Khan ]
Fixes: fb43d6cb91ef ('x86/mm: Do not auto-massage page protections')
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/ldt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c index d41d896481b8..c9b14020f4dd 100644 --- a/arch/x86/kernel/ldt.c +++ b/arch/x86/kernel/ldt.c @@ -166,7 +166,7 @@ map_ldt_struct(struct mm_struct *mm, struct ldt_struct *ldt, int slot) */ pte_prot = __pgprot(__PAGE_KERNEL_RO & ~_PAGE_GLOBAL); /* Filter out unsuppored __PAGE_KERNEL* bits: */ - pgprot_val(pte_prot) |= __supported_pte_mask; + pgprot_val(pte_prot) &= __supported_pte_mask; pte = pfn_pte(pfn, pte_prot); set_pte_at(mm, va, ptep, pte); pte_unmap_unlock(ptep, ptl); |