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| author | Jan Beulich <jbeulich@novell.com> | 2007-02-17 13:33:31 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-03-09 10:50:22 -0800 |
| commit | 7e3cd6f62e48e206716b3317c18eacd4a5c02efc (patch) | |
| tree | cfc032d748862eae446d5c0e2de3fd8f839d0c82 /arch | |
| parent | 84cb9c519287d8bfeafbc060bd5cf4f25dfc9eb8 (diff) | |
| download | lwn-7e3cd6f62e48e206716b3317c18eacd4a5c02efc.tar.gz lwn-7e3cd6f62e48e206716b3317c18eacd4a5c02efc.zip | |
i386: Fix broken CONFIG_COMPAT_VDSO on i386
After updating several machines to 2.6.20, I can't boot anymore the single
one of them that supports the NX bit and is configured as a 32-bit system.
My understanding is that the VDSO changes in 2.6.20-rc7 were not fully
cooked, in that with that config option enabled VDSO_SYM(x) now equals
x, meaning that an address in the fixmap area is now being passed to
apps via AT_SYSINFO. However, the page is mapped with PAGE_READONLY
rather than PAGE_READONLY_EXEC.
I'm not certain whether having app code go through the fixmap area is
intended, but in case it is here is the simple patch that makes things work
again.
Cc: Theodore Tso <tytso@mit.edu>
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/kernel/sysenter.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/i386/kernel/sysenter.c b/arch/i386/kernel/sysenter.c index 5da744204d10..666f70d92619 100644 --- a/arch/i386/kernel/sysenter.c +++ b/arch/i386/kernel/sysenter.c @@ -77,7 +77,7 @@ int __init sysenter_setup(void) syscall_page = (void *)get_zeroed_page(GFP_ATOMIC); #ifdef CONFIG_COMPAT_VDSO - __set_fixmap(FIX_VDSO, __pa(syscall_page), PAGE_READONLY); + __set_fixmap(FIX_VDSO, __pa(syscall_page), PAGE_READONLY_EXEC); printk("Compat vDSO mapped to %08lx.\n", __fix_to_virt(FIX_VDSO)); #endif |