Messages in this thread | | | Date | Tue, 3 Feb 2004 18:23:10 +0000 | From | Jamie Lokier <> | Subject | Re: [RFC][PATCH] linux-2.6.2-rc2_vsyscall-gtod_B1.patch |
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Andrea Arcangeli wrote: > vsyscalls will never execute anything like execve. They can at most > modify userspace memory a fixed address, so if the userspace isn't > fixed, then nothing can be done with a vsyscall.
Are we talking about the same x86_64?
I see this in arch/x86_64/vsyscall.S:
__kernel_vsyscall: .LSTART_vsyscall: push %ebp .Lpush_ebp: movl %ecx, %ebp syscall
Is that page not mapped into userspace?
If the answer is no, then btw we were talking about i386 until you joined in. :) The "sysenter" instruction is definitely mapped into userspace there.
-- Jamie
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