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[IA64] forbid ptrace changes psr.ri to 3

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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>
This commit is contained in:
Shaohua Li
2007-08-17 13:43:50 -07:00
committed by Tony Luck
parent e8c59c0cf9
commit b09e789c43
1 changed files with 7 additions and 3 deletions
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10
arch/ia64/kernel/ptrace.c
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@@ -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;