Author: sewardj
Date: 2007-11-19 00:58:18 +0000 (Mon, 19 Nov 2007)
New Revision: 7183
Log:
When doing ptrace on amd64-linux, provide values which don't fail the
kernel's sanity checks for kernel >= 2.6.21. Fixes #145622.
Modified:
trunk/coregrind/m_debugger.c
Modified: trunk/coregrind/m_debugger.c
===================================================================
--- trunk/coregrind/m_debugger.c 2007-11-18 18:22:50 UTC (rev 7182)
+++ trunk/coregrind/m_debugger.c 2007-11-19 00:58:18 UTC (rev 7183)
@@ -87,6 +87,21 @@
regs.r15 = vex->guest_R15;
regs.eflags = LibVEX_GuestAMD64_get_rflags(vex);
regs.rip = vex->guest_RIP;
+ /* Set %{c,d,e,f,s,g}s and %{fs,gs}_base (whatever those are) to
+ values which don't fail the kernel's sanity checks. I have no
+ idea what these should really be set to. Anyway, mostly it
+ seems that zero is an allowable value, except for %cs and %ss
+ which have to have their lowest 2 bits be 11. See putreg() in
+ linux-2.6.23/arch/x86_64/kernel/ptrace.c for the apparently
+ relevant sanity checks. This fixes #145622. */
+ regs.cs = 3;
+ regs.ds = 0;
+ regs.es = 0;
+ regs.fs = 0;
+ regs.ss = 3;
+ regs.gs = 0;
+ regs.fs_base = 0;
+ regs.gs_base = 0;
return VG_(ptrace)(VKI_PTRACE_SETREGS, pid, NULL, ®s);
#elif defined(VGP_ppc32_linux)
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