[6/8] signal/x86: Fix SIGSYS handling in copy_siginfo_to_user32

Submitted by Eric W. Biederman on June 30, 2017, 12:39 p.m.


Message ID 20170630123906.8865-6-ebiederm@xmission.com
State New
Series "Series without cover letter"
Headers show

Commit Message

Eric W. Biederman June 30, 2017, 12:39 p.m.
While examining the code I realized that we don't copy si_call_addr to
32bit callers.  Fix it.

It looks like no one has used this code path in the last 5 years.

Cc: Will Drewry <wad@chromium.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Eric Paris <eparis@redhat.com>
Cc: Serge Hallyn <serge@hallyn.com>
Cc: James Morris <james.l.morris@oracle.com>
Fixes: a0727e8ce513 ("signal, x86: add SIGSYS info and make it synchronous.")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
 arch/x86/kernel/signal_compat.c | 1 +
 1 file changed, 1 insertion(+)

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diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c
index 71beb28600d4..59e1029bb3d0 100644
--- a/arch/x86/kernel/signal_compat.c
+++ b/arch/x86/kernel/signal_compat.c
@@ -161,6 +161,7 @@  int __copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from,
 			case __SI_SYS >> 16:
+				put_user_ex(ptr_to_compat(from->si_call_addr), &to->si_call_addr);
 				put_user_ex(from->si_syscall, &to->si_syscall);
 				put_user_ex(from->si_arch, &to->si_arch);