Linus,
Please do
git pull \
git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc.git merge
to get a patch from Roland McGrath that fixes a user-triggerable oops
on 64-bit powerpc.
Thanks,
Paul.
arch/powerpc/kernel/process.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
commit 474f81967217f3bec2389ae913da72641f2c40e3
Author: Roland McGrath <[EMAIL PROTECTED]>
Date: Mon Sep 24 16:52:44 2007 -0700
[POWERPC] Ensure FULL_REGS on exec
When PTRACE_O_TRACEEXEC is used, a ptrace call to fetch the registers at
the PTRACE_EVENT_EXEC stop (PTRACE_PEEKUSR) will oops in CHECK_FULL_REGS.
With recent versions, "gdb --args /bin/sh -c 'exec /bin/true'" and "run" at
the (gdb) prompt is sufficient to produce this. I also have written an
isolated test case, see
https://bugzilla.redhat.com/show_bug.cgi?id=301791#c15.
This change fixes the problem by clearing the low bit of pt_regs.trap in
start_thread so that FULL_REGS is true again. This is correct since all of
the GPRs that "full" refers to are cleared in start_thread.
Signed-off-by: Roland McGrath <[EMAIL PROTECTED]>
Signed-off-by: Paul Mackerras <[EMAIL PROTECTED]>
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