linux-kernel - [tip:x86/urgent] selftests/x86: Add a fork() to entry_from

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Message-ID: <tip-226f1f729ce277720fab60c91dd1b12574cfe66c@git.kernel.org>
Date:	Sat, 31 Oct 2015 01:54:47 -0700
From:	tip-bot for Andy Lutomirski <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, luto@...nel.org,
	tglx@...utronix.de, stsp@...t.ru, torvalds@...ux-foundation.org,
	mingo@...nel.org, bp@...en8.de, brgerst@...il.com
Subject: [tip:x86/urgent] selftests/x86: Add a fork()
  to entry_from_vm86 to catch fork bugs

Commit-ID:  226f1f729ce277720fab60c91dd1b12574cfe66c
Gitweb:     http://git.kernel.org/tip/226f1f729ce277720fab60c91dd1b12574cfe66c
Author:     Andy Lutomirski <luto@...nel.org>
AuthorDate: Fri, 30 Oct 2015 22:42:45 -0700
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sat, 31 Oct 2015 09:50:25 +0100

selftests/x86: Add a fork() to entry_from_vm86 to catch fork bugs

Mere possession of vm86 state is strange.  Make sure that nothing
gets corrupted if we fork after calling vm86().

Signed-off-by: Andy Lutomirski <luto@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Stas Sergeev <stsp@...t.ru>
Link: http://lkml.kernel.org/r/08f83295460a80e41dc5e3e81ec40d6844d316f5.1446270067.git.luto@kernel.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 tools/testing/selftests/x86/entry_from_vm86.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/x86/entry_from_vm86.c b/tools/testing/selftests/x86/entry_from_vm86.c
index 421c607..d075ea0 100644
--- a/tools/testing/selftests/x86/entry_from_vm86.c
+++ b/tools/testing/selftests/x86/entry_from_vm86.c
@@ -230,5 +230,9 @@ int main(void)
 	}
 	clearhandler(SIGSEGV);
 
+	/* Make sure nothing explodes if we fork. */
+	if (fork() > 0)
+		return 0;
+
 	return (nerrs == 0 ? 0 : 1);
 }
--
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