linux-kernel - [PATCH v6 01/16] perf tools: Fix PowerPC native building

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1450349724-178569-2-git-send-email-wangnan0@huawei.com>
Date:	Thu, 17 Dec 2015 10:55:09 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<ast@...nel.org>, <acme@...nel.org>, <acme@...hat.com>,
	<brendan.d.gregg@...il.com>, <davem@...emloft.net>,
	<hekuang@...wei.com>, <jolsa@...nel.org>,
	<masami.hiramatsu.pt@...achi.com>, <namhyung@...nel.org>,
	<naveen.n.rao@...ux.vnet.ibm.com>, <sukadev@...ux.vnet.ibm.com>,
	<wangnan0@...wei.com>, <lizefan@...wei.com>
CC:	<pi3orama@....com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v6 01/16] perf tools: Fix PowerPC native building

Checks BPF syscall number, turn off libbpf building on platform doesn't
correctly support sys_bpf instead of blocking compiling.

Reported-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Tested-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
---
 tools/build/feature/test-bpf.c | 20 +++++++++++++++++++-
 tools/lib/bpf/bpf.c            |  4 ++--
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/tools/build/feature/test-bpf.c b/tools/build/feature/test-bpf.c
index 062bac8..b389026 100644
--- a/tools/build/feature/test-bpf.c
+++ b/tools/build/feature/test-bpf.c
@@ -1,9 +1,23 @@
+#include <asm/unistd.h>
 #include <linux/bpf.h>
+#include <unistd.h>
+
+#ifndef __NR_bpf
+# if defined(__i386__)
+#  define __NR_bpf 357
+# elif defined(__x86_64__)
+#  define __NR_bpf 321
+# elif defined(__aarch64__)
+#  define __NR_bpf 280
+#  error __NR_bpf not defined. libbpf does not support your arch.
+# endif
+#endif
 
 int main(void)
 {
 	union bpf_attr attr;
 
+	/* Check fields in attr */
 	attr.prog_type = BPF_PROG_TYPE_KPROBE;
 	attr.insn_cnt = 0;
 	attr.insns = 0;
@@ -14,5 +28,9 @@ int main(void)
 	attr.kern_version = 0;
 
 	attr = attr;
-	return 0;
+	/*
+	 * Test existence of __NR_bpf and BPF_PROG_LOAD.
+	 * This call should fail if we run the testcase.
+	 */
+	return syscall(__NR_bpf, BPF_PROG_LOAD, attr, sizeof(attr));
 }
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 5bdc6ea..1f91cc9 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -14,8 +14,8 @@
 #include "bpf.h"
 
 /*
- * When building perf, unistd.h is override. Define __NR_bpf is
- * required to be defined.
+ * When building perf, unistd.h is overrided. __NR_bpf is
+ * required to be defined explicitly.
  */
 #ifndef __NR_bpf
 # if defined(__i386__)
-- 
1.8.3.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/