From: Dmitry V. Levin <ldv@altlinux.org>
Date: Sun, 27 Dec 2015 00:18:35 +0000 (+0000)
Subject: Handle unlikely errors from personality syscall
X-Git-Tag: v4.12~786
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0297e0c06788576fd1b86a0d533d6d7157ec7a03;p=strace

Handle unlikely errors from personality syscall

Despite being marked as SYSCALL_NEVER_FAILS, personality syscall still
might report a failure on some architectures due to obscure kernel
bugs.  Check for this unlikely case and let users know that their
kernel has gone bananas.

* personality.c (SYS_FUNC(personality)): Do not parse syscall return
value in case of syserror.
---

diff --git a/personality.c b/personality.c
index 02dc80f2..44ed5e3b 100644
--- a/personality.c
+++ b/personality.c
@@ -50,6 +50,9 @@ SYS_FUNC(personality)
 		return 0;
 	}
 
+	if (syserror(tcp))
+		return 0;
+
 	pers = tcp->u_rval;
 	const char *type = xlookup(personality_types, pers & PER_MASK);
 	char *p;