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authorShaohua Li <shaohua.li@intel.com>2007-08-17 13:43:50 -0700
committerTony Luck <tony.luck@intel.com>2007-08-17 13:43:50 -0700
commitb09e789c438c406bd9bcaac6f1c940a75007e59f (patch)
tree2e753d921e182653acf7badb1c6ebc0761047d7f
parente8c59c0cf9c91dccfb6367c306d753500d5a0150 (diff)
[IA64] forbid ptrace changes psr.ri to 3
The "ri" field in the processor status register only has defined values of 0, 1, 2. Do not let ptrace set this to 3. As with other reserved fields in registers we silently discard the value. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
-rw-r--r--arch/ia64/kernel/ptrace.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 00f803246948..122444a97897 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -951,10 +951,14 @@ access_uarea (struct task_struct *child, unsigned long addr,
return 0;
case PT_CR_IPSR:
- if (write_access)
- pt->cr_ipsr = ((*data & IPSR_MASK)
+ if (write_access) {
+ unsigned long tmp = *data;
+ /* psr.ri==3 is a reserved value: SDM 2:25 */
+ if ((tmp & IA64_PSR_RI) == IA64_PSR_RI)
+ tmp &= ~IA64_PSR_RI;
+ pt->cr_ipsr = ((tmp & IPSR_MASK)
| (pt->cr_ipsr & ~IPSR_MASK));
- else
+ } else
*data = (pt->cr_ipsr & IPSR_MASK);
return 0;