This means if an illegal value is set for the segment registers there
ptrace will error out now with an errno instead of silently ignoring
it.
Signed-off-by: Andi Kleen <[email protected]>
---
arch/x86_64/kernel/ptrace.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
Index: linux/arch/x86_64/kernel/ptrace.c
===================================================================
--- linux.orig/arch/x86_64/kernel/ptrace.c
+++ linux/arch/x86_64/kernel/ptrace.c
@@ -536,8 +536,12 @@ long arch_ptrace(struct task_struct *chi
}
ret = 0;
for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) {
- ret |= __get_user(tmp, (unsigned long __user *) data);
- putreg(child, ui, tmp);
+ ret = __get_user(tmp, (unsigned long __user *) data);
+ if (ret)
+ break;
+ ret = putreg(child, ui, tmp);
+ if (ret)
+ break;
data += sizeof(long);
}
break;
-
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