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| author | Borislav Petkov <bp@suse.de> | 2018-01-04 17:42:45 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-10 09:27:14 +0100 |
| commit | 6dcf5491e01c3d1135497d0661bb5b35a126b9d8 (patch) | |
| tree | 9b325fdfe2bbcb95cb834e4a0e443e33e9c7cd6d /arch/x86/include/asm | |
| parent | 90191f71d74901ff88cd10039c03b98ca8a66c08 (diff) | |
| download | linux-6dcf5491e01c3d1135497d0661bb5b35a126b9d8.tar.gz linux-6dcf5491e01c3d1135497d0661bb5b35a126b9d8.tar.bz2 linux-6dcf5491e01c3d1135497d0661bb5b35a126b9d8.zip | |
Map the vsyscall page with _PAGE_USER
This needs to happen early in kaiser_pagetable_walk(), before the
hierarchy is established so that _PAGE_USER permission can be really
set.
A proper fix would be to teach kaiser_pagetable_walk() to update those
permissions but the vsyscall page is the only exception here so ...
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/vsyscall.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/vsyscall.h b/arch/x86/include/asm/vsyscall.h index 6ba66ee79710..4865e10dbb55 100644 --- a/arch/x86/include/asm/vsyscall.h +++ b/arch/x86/include/asm/vsyscall.h @@ -12,12 +12,14 @@ extern void map_vsyscall(void); * Returns true if handled. */ extern bool emulate_vsyscall(struct pt_regs *regs, unsigned long address); +extern bool vsyscall_enabled(void); #else static inline void map_vsyscall(void) {} static inline bool emulate_vsyscall(struct pt_regs *regs, unsigned long address) { return false; } +static inline bool vsyscall_enabled(void) { return false; } #endif #endif /* _ASM_X86_VSYSCALL_H */ |