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[v2,05/16] ptrace: in PEEK_SIGINFO, check syscall bitness, not task bitness

Message ID d1f58b0983fc85bf2440fdb86b186d9f214e03f7.1453759363.git.luto@kernel.org
State Not Applicable
Delegated to: David Miller
Headers show

Commit Message

Andy Lutomirski Jan. 25, 2016, 10:24 p.m. UTC 
Users of the 32-bit ptrace() ABI expect the full 32-bit ABI.
siginfo translation should check ptrace() ABI, not caller task ABI.

This is an ABI change on SPARC.  Let's hope that no one relied on
the old buggy ABI.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
 kernel/ptrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 2341efe7fe02..c79b91d09e35 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -681,7 +681,7 @@  static int ptrace_peek_siginfo(struct task_struct *child,
 			break;
 
 #ifdef CONFIG_COMPAT
-		if (unlikely(is_compat_task())) {
+		if (unlikely(in_compat_syscall())) {
 			compat_siginfo_t __user *uinfo = compat_ptr(data);
 
 			if (copy_siginfo_to_user32(uinfo, &info) ||