From: Dmitry V. Levin <ldv@altlinux.org>
Date: Fri, 4 Dec 2015 16:42:30 +0000 (+0000)
Subject: x32: fix decoding of i386 personality lseek syscall
X-Git-Tag: v4.11~68
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a5aa080ae68a95e2fbc3466b242987fd2879b28a;p=strace

x32: fix decoding of i386 personality lseek syscall

On x32, tcp->ext_arg is not initialized for i386 personality,
so tcp->u_arg has to be used instead.

* lseek.c (SYS_FUNC(lseek)) [X32]: Handle "current_personality == 1" case.
---

diff --git a/lseek.c b/lseek.c
index f02158e7..8d8f21b9 100644
--- a/lseek.c
+++ b/lseek.c
@@ -16,6 +16,12 @@ SYS_FUNC(lseek)
 	int whence;
 
 	printfd(tcp, tcp->u_arg[0]);
+# ifdef X32
+	/* tcp->ext_arg is not initialized for i386 personality */
+	if (current_personality == 1)
+		offset = tcp->u_arg[1];
+	else
+# endif
 	offset = tcp->ext_arg[1];
 	whence = tcp->u_arg[2];
 	if (whence == SEEK_SET)