===================================================================
@@ -67,7 +67,7 @@ static long compat_ptrace_old(struct tas
/* Macros to workout the correct index for the FPR in the thread struct */
#define FPRNUMBER(i) (((i) - PT_FPR0) >> 1)
#define FPRHALF(i) (((i) - PT_FPR0) & 1)
-#define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) + FPRHALF(i)
+#define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i)
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t caddr, compat_ulong_t cdata)
Fix the calculation for offsetting into the FPRs when ptracing a 32 bit app on 64 bit kernels. Signed-off-by: Michael Neuling <mikey@neuling.org> cc: stable@kernel.org --- benh: it'd be nice if this went back in to 27,28 & 29 Also, I vote we kill ptracing 64 bit apps from 32 apps as it's completely broken and no one has ever noticed. arch/powerpc/kernel/ptrace32.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)