Messages in this thread | | | From | Linus Torvalds <> | Date | Sun, 21 Aug 2011 18:09:00 -0700 | Subject | Re: SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386) |
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On Sun, Aug 21, 2011 at 5:44 PM, Andrew Lutomirski <luto@mit.edu> wrote: > > Which suggests an easy-ish fix: if sysenter is used or if syscall is > entered from the EIP is is supposed to be entered from, then just > change ip in the argument save to point to the int 0x80 instruction.
Indeed. Just add an "int 0x80" instruction to the vsyscall thing, and you'd be done.
In fact, just replace the
jmp .Lenter_kernel
with
int 0x80
and you'd be pretty much all done, no?
(Ok, that's probably a huge over-simplification, but perhaps "close enough" to true that it would be workable)
Linus
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