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authorErnie Petrides <petrides@redhat.com>2006-12-06 20:14:09 -0500
committerAndi Kleen <andi@basil.nowhere.org>2006-12-06 20:14:09 -0500
commit103efcd9aac1de4da6a1477f2f3b9fcf35273a18 (patch)
treeac8e8a1f379a35cfaa96992fb3f8c69e1c88195e /arch/x86_64/kernel/vsyscall.c
parentc55d92d141b9c40c67db249de91f5c224eb49859 (diff)
[PATCH] x86-64: fix perms/range of vsyscall vma in /proc/*/maps
The final line of /proc/<pid>/maps on x86_64 for native 64-bit tasks shows an incorrect ending address and incorrect permissions. There is only a single page mapped in this vsyscall region, and it is accessible for both read and execute. The patch below fixes this. (Since 32-bit-compat tasks have a real vma with correct perms/range, no change is necessary for that scenario.) Before the patch, a "cat /proc/self/maps | tail -1" shows this: ffffffffff600000-ffffffffffe00000 ---p 00000000 [...] After the patch, this is the output: ffffffffff600000-ffffffffff601000 r-xp 00000000 [...] Signed-off-by: Ernie Petrides <petrides@redhat.com> Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/x86_64/kernel/vsyscall.c')
-rw-r--r--arch/x86_64/kernel/vsyscall.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/vsyscall.c b/arch/x86_64/kernel/vsyscall.c
index 92546c1526f1..c3de9a09cd9f 100644
--- a/arch/x86_64/kernel/vsyscall.c
+++ b/arch/x86_64/kernel/vsyscall.c
@@ -290,6 +290,7 @@ static void __init map_vsyscall(void)
290 extern char __vsyscall_0; 290 extern char __vsyscall_0;
291 unsigned long physaddr_page0 = __pa_symbol(&__vsyscall_0); 291 unsigned long physaddr_page0 = __pa_symbol(&__vsyscall_0);
292 292
293 /* Note that VSYSCALL_MAPPED_PAGES must agree with the code below. */
293 __set_fixmap(VSYSCALL_FIRST_PAGE, physaddr_page0, PAGE_KERNEL_VSYSCALL); 294 __set_fixmap(VSYSCALL_FIRST_PAGE, physaddr_page0, PAGE_KERNEL_VSYSCALL);
294} 295}
295 296