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authorRoland McGrath <roland@redhat.com>2008-03-13 09:25:35 +0100
committerPaul Mackerras <paulus@samba.org>2008-03-20 00:10:56 +0100
commitc2372eb9bcafdd149b26987a8c25bbed92fd2775 (patch)
tree8e32ac8e467593c333cfed402fdb766cba80308a /arch/powerpc
parentMerge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/as... (diff)
downloadlinux-c2372eb9bcafdd149b26987a8c25bbed92fd2775.tar.xz
linux-c2372eb9bcafdd149b26987a8c25bbed92fd2775.zip
[POWERPC] user_regset PTRACE_SETREGS regression fix
The PTRACE_SETREGS request was only recently added on powerpc, and gdb does not use it. So it slipped through without getting all the testing it should have had. The user_regset changes had a simple bug in storing to all of the 32-bit general registers block on 64-bit kernels. This bug only comes up with PTRACE_SETREGS, not PPC_PTRACE_SETREGS. It causes a BUG_ON to hit, so this fix needs to go in ASAP. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/ptrace.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 7673e9865733..2a9fe97e4521 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -530,15 +530,21 @@ static int gpr32_set(struct task_struct *target,
--count;
}
- if (kbuf)
+ if (kbuf) {
for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
regs[pos++] = *k++;
- else
+ for (; count > 0 && pos < PT_TRAP; --count, ++pos)
+ ++k;
+ } else {
for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
if (__get_user(reg, u++))
return -EFAULT;
regs[pos++] = reg;
}
+ for (; count > 0 && pos < PT_TRAP; --count, ++pos)
+ if (__get_user(reg, u++))
+ return -EFAULT;
+ }
if (count > 0 && pos == PT_TRAP) {
if (kbuf)