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| author | Andy Lutomirski <luto@amacapital.net> | 2014-07-25 16:27:01 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-07-25 16:32:53 -0700 |
| commit | ac379835e820de27429b5c4eadf4c1b40320cff4 (patch) | |
| tree | a3946752e7667cde6bf12b4921b6d095d3a7724a | |
| parent | da861e18ecccb5c126b9eb95ff720ce082a46286 (diff) | |
| download | linux-stable-ac379835e820de27429b5c4eadf4c1b40320cff4.tar.gz linux-stable-ac379835e820de27429b5c4eadf4c1b40320cff4.tar.bz2 linux-stable-ac379835e820de27429b5c4eadf4c1b40320cff4.zip | |
x86/vdso: Set VM_MAYREAD for the vvar vma
The VVAR area can, obviously, be read; that is kind of the point.
AFAIK this has no effect whatsoever unless x86 suddenly turns into a
nommu architecture. Nonetheless, not setting it is suspicious.
Reported-by: Nathan Lynch <Nathan_Lynch@mentor.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/e4c8bf4bc2725bda22c4a4b7d0c82adcd8f8d9b8.1406330779.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| -rw-r--r-- | arch/x86/vdso/vma.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c index dbef622bb5af..970463b566cf 100644 --- a/arch/x86/vdso/vma.c +++ b/arch/x86/vdso/vma.c @@ -138,7 +138,7 @@ static int map_vdso(const struct vdso_image *image, bool calculate_addr) vma = _install_special_mapping(mm, addr, -image->sym_vvar_start, - VM_READ, + VM_READ|VM_MAYREAD, &vvar_mapping); if (IS_ERR(vma)) { |