diff options
| author | Ben Hutchings <ben.hutchings@codethink.co.uk> | 2018-01-26 16:23:02 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-31 12:55:53 +0100 |
| commit | 9a0be5afbfbb1d14efdc98a6615fc52082243bd1 (patch) | |
| tree | c108533092e8c1db2c8e5d3473abc86956f4c1f1 /arch/x86/entry | |
| parent | 1be7d46e775c2fbec57bbce7190b66fbb7c58d1b (diff) | |
vsyscall: Fix permissions for emulate mode with KAISER/PTI
The backport of KAISER to 4.4 turned vsyscall emulate mode into native
mode. Add a vsyscall_pgprot variable to hold the correct page
protections, like Borislav and Hugh did for 3.2 and 3.18.
Cc: Borislav Petkov <bp@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/entry')
| -rw-r--r-- | arch/x86/entry/vsyscall/vsyscall_64.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/x86/entry/vsyscall/vsyscall_64.c b/arch/x86/entry/vsyscall/vsyscall_64.c index 6bb7e92c6d50..0174290b2857 100644 --- a/arch/x86/entry/vsyscall/vsyscall_64.c +++ b/arch/x86/entry/vsyscall/vsyscall_64.c @@ -46,6 +46,7 @@ static enum { EMULATE, NATIVE, NONE } vsyscall_mode = #else EMULATE; #endif +unsigned long vsyscall_pgprot = __PAGE_KERNEL_VSYSCALL; static int __init vsyscall_setup(char *str) { @@ -336,11 +337,11 @@ void __init map_vsyscall(void) extern char __vsyscall_page; unsigned long physaddr_vsyscall = __pa_symbol(&__vsyscall_page); + if (vsyscall_mode != NATIVE) + vsyscall_pgprot = __PAGE_KERNEL_VVAR; if (vsyscall_mode != NONE) __set_fixmap(VSYSCALL_PAGE, physaddr_vsyscall, - vsyscall_mode == NATIVE - ? PAGE_KERNEL_VSYSCALL - : PAGE_KERNEL_VVAR); + __pgprot(vsyscall_pgprot)); BUILD_BUG_ON((unsigned long)__fix_to_virt(VSYSCALL_PAGE) != (unsigned long)VSYSCALL_ADDR); |