On Mon, Aug 22, 2011 at 04:40:51PM +0200, Borislav Petkov wrote: > Just to make sure I'm grokking this correctly - we want to use int $0x80 > only for the SYSCALL variant in __kernel_vsyscall, right? Not for all > 32-bit syscalls on a 64-bit kernel.
Um... The problem is, syscall restart with SYSCALL insn is badly broken; we end up with arg2 (expected by SYSCALL in %ebp) overwritten with arg6 by IRET path. With obvious nasty results. In __kernel_vsyscall() the problem is possible to deal with; there we control the code around that sucker. It's SYSCALL in 32bit binary outside of vdso32 that causes real PITA... ------------------------------------------------------------------------------ uberSVN's rich system and user administration capabilities and model configuration take the hassle out of deploying and managing Subversion and the tools developers use with it. Learn more about uberSVN and get a free download at: http://p.sf.net/sfu/wandisco-dev2dev _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
