Messages in this thread | | | Date | Mon, 6 Jan 2003 19:17:37 +0100 | From | Luca Barbieri <> | Subject | Re: [PATCH] Set TIF_IRET in more places |
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I've looked again at it and it is actually less problematic that I first thought but I still see the following two cases:
1. vfork seems to not set any TIF_ flags so a ptracer setting regs while a vforking task is stopped in ptrace_notify called from vfork would result in clobbered %ecx and %edx.
2. A ptracer could use %ecx or %edx to pass information to signal handlers and this would not work with the current [rt_]sigsuspend.
These only need setting TIF_IRET on ptrace setregs though.
There is also the very small advantage of being able to hardcode SYSENTER_RETURN as the return eip for sysexit if TIF_IRET is set in all the 3 places. [unhandled content-type:application/pgp-signature] | |