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authorAndy Lutomirski <luto@mit.edu>2011-06-05 13:50:21 -0400
committerIngo Molnar <mingo@elte.hu>2011-06-05 21:30:33 +0200
commitd319bb79afa4039bda6f85661d6bf0c13299ce93 (patch)
tree60c069b78fa30b230efaa10c9e13f95431f8e961 /arch/x86/kernel/hpet.c
parent0d7b8547fb67d5c2a7d954c56b3715b0e708be4a (diff)
downloadlinux-d319bb79afa4039bda6f85661d6bf0c13299ce93.tar.bz2
x86-64: Map the HPET NX
Currently the HPET mapping is a user-accessible syscall instruction at a fixed address some of the time. A sufficiently determined hacker might be able to guess when. Signed-off-by: Andy Lutomirski <luto@mit.edu> Cc: Jesper Juhl <jj@chaosbits.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Arjan van de Ven <arjan@infradead.org> Cc: Jan Beulich <JBeulich@novell.com> Cc: richard -rw- weinberger <richard.weinberger@gmail.com> Cc: Mikael Pettersson <mikpe@it.uu.se> Cc: Andi Kleen <andi@firstfloor.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Louis Rilling <Louis.Rilling@kerlabs.com> Cc: Valdis.Kletnieks@vt.edu Cc: pageexec@freemail.hu Link: http://lkml.kernel.org/r/ab41b525a4ca346b1ca1145d16fb8d181861a8aa.1307292171.git.luto@mit.edu Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/hpet.c')
-rw-r--r--arch/x86/kernel/hpet.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 6781765b3a0d..e9f5605e4748 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -71,7 +71,7 @@ static inline void hpet_set_mapping(void)
{
hpet_virt_address = ioremap_nocache(hpet_address, HPET_MMAP_SIZE);
#ifdef CONFIG_X86_64
- __set_fixmap(VSYSCALL_HPET, hpet_address, PAGE_KERNEL_VSYSCALL_NOCACHE);
+ __set_fixmap(VSYSCALL_HPET, hpet_address, PAGE_KERNEL_VVAR_NOCACHE);
#endif
}