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From: linux at dominikbrodowski.net (Dominik Brodowski)
Subject: [Linux-kselftest-mirror] [PATCH 3/5] selftests/x86: do not rely on int $0x80 in test_mremap_vdso.c
Date: Sun, 11 Feb 2018 12:10:11 +0100
Message-ID: <20180211111013.16888-4-linux@dominikbrodowski.net> (raw)
In-Reply-To: <20180211111013.16888-1-linux@dominikbrodowski.net>

On 64bit builds, we should not rely on int $0x80 working (it only does if
CONFIG_IA32_EMULATION is enabled). Without this patch, the move test may
succeed, but the int $0x80 cause a segfault, resulting in a false negative
output of this selftest.

CC: Dmitry Safonov <dsafonov at virtuozzo.com>
CC: Andy Lutomirski <luto at kernel.org>
Signed-off-by: Dominik Brodowski <linux at dominikbrodowski.net>
---
 tools/testing/selftests/x86/test_mremap_vdso.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/x86/test_mremap_vdso.c b/tools/testing/selftests/x86/test_mremap_vdso.c
index bf0d687c7db7..64f11c8d9b76 100644
--- a/tools/testing/selftests/x86/test_mremap_vdso.c
+++ b/tools/testing/selftests/x86/test_mremap_vdso.c
@@ -90,8 +90,12 @@ int main(int argc, char **argv, char **envp)
 			vdso_size += PAGE_SIZE;
 		}
 
+#ifdef __i386__
 		/* Glibc is likely to explode now - exit with raw syscall */
 		asm volatile ("int $0x80" : : "a" (__NR_exit), "b" (!!ret));
+#else /* __x86_64__ */
+		syscall(SYS_exit, ret);
+#endif
 	} else {
 		int status;
 
-- 
2.16.1

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From: linux@dominikbrodowski.net (Dominik Brodowski)
Subject: [Linux-kselftest-mirror] [PATCH 3/5] selftests/x86: do not rely on int $0x80 in test_mremap_vdso.c
Date: Sun, 11 Feb 2018 12:10:11 +0100
Message-ID: <20180211111013.16888-4-linux@dominikbrodowski.net> (raw)
Message-ID: <20180211111011.zzmYRvdhAXgYdonyHp1zX2WpX99osxUMIoSdjasg5iE@z> (raw)
In-Reply-To: <20180211111013.16888-1-linux@dominikbrodowski.net>

On 64bit builds, we should not rely on int $0x80 working (it only does if
CONFIG_IA32_EMULATION is enabled). Without this patch, the move test may
succeed, but the int $0x80 cause a segfault, resulting in a false negative
output of this selftest.

CC: Dmitry Safonov <dsafonov at virtuozzo.com>
CC: Andy Lutomirski <luto at kernel.org>
Signed-off-by: Dominik Brodowski <linux at dominikbrodowski.net>
---
 tools/testing/selftests/x86/test_mremap_vdso.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/x86/test_mremap_vdso.c b/tools/testing/selftests/x86/test_mremap_vdso.c
index bf0d687c7db7..64f11c8d9b76 100644
--- a/tools/testing/selftests/x86/test_mremap_vdso.c
+++ b/tools/testing/selftests/x86/test_mremap_vdso.c
@@ -90,8 +90,12 @@ int main(int argc, char **argv, char **envp)
 			vdso_size += PAGE_SIZE;
 		}
 
+#ifdef __i386__
 		/* Glibc is likely to explode now - exit with raw syscall */
 		asm volatile ("int $0x80" : : "a" (__NR_exit), "b" (!!ret));
+#else /* __x86_64__ */
+		syscall(SYS_exit, ret);
+#endif
 	} else {
 		int status;
 
-- 
2.16.1

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  parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-11 11:10 [Linux-kselftest-mirror] [PATCH 0/5] selftests/x86: fixes for !CONFIG_IA32_EMULATION and vsyscall=none linux
2018-02-11 11:10 ` Dominik Brodowski
2018-02-11 11:10 ` [Linux-kselftest-mirror] [PATCH 1/5] selftests/x86: 5lvl test has been moved linux
2018-02-11 11:10   ` Dominik Brodowski
2018-02-11 11:10 ` [Linux-kselftest-mirror] [PATCH 2/5] selftests/x86: fix vDSO selftest segfault for vsyscall=none linux
2018-02-11 11:10   ` Dominik Brodowski
2018-02-11 11:21   ` mingo
2018-02-11 11:21     ` Ingo Molnar
2018-02-11 12:17     ` linux
2018-02-11 12:17       ` Dominik Brodowski
2018-02-11 13:00       ` linux
2018-02-11 13:00         ` Dominik Brodowski
2018-02-11 18:24         ` mingo
2018-02-11 18:24           ` Ingo Molnar
2018-02-11 20:59           ` [Linux-kselftest-mirror] [PATCH] selftests/x86: clarify that there is no buffer overflow on sscanf usage linux
2018-02-11 20:59             ` Dominik Brodowski
2018-02-12 17:58             ` shuah
2018-02-12 17:58               ` Shuah Khan
2018-02-11 11:10 ` linux [this message]
2018-02-11 11:10   ` [Linux-kselftest-mirror] [PATCH 3/5] selftests/x86: do not rely on int $0x80 in test_mremap_vdso.c Dominik Brodowski
2018-02-11 11:10 ` [Linux-kselftest-mirror] [PATCH 4/5] selftests/x86: do not rely on int $0x80 in single_step_syscall.c linux
2018-02-11 11:10   ` Dominik Brodowski
2018-02-11 11:10 ` [Linux-kselftest-mirror] [PATCH 5/5] selftests/x86: disable tests requiring 32bit support on pure 64bit systems linux
2018-02-11 11:10   ` Dominik Brodowski

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