Messages in this thread | | | Date | Mon, 22 Aug 2011 02:19:39 +0100 | From | Al Viro <> | 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 06:09:00PM -0700, Linus Torvalds wrote: > 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?
In case of sysenter - almost, in case of syscall - nope...
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