From: Wang Nan <wangnan0@huawei.com>
To: <acme@kernel.org>, <ast@plumgrid.com>
Cc: <linux-kernel@vger.kernel.org>, <lizefan@huawei.com>,
<hekuang@huawei.com>, <xiakaixu@huawei.com>, <pi3orama@163.com>
Subject: [PATCH v11 09/39] bpf tools: Collect version and license from ELF sections
Date: Wed, 8 Jul 2015 13:13:58 +0000 [thread overview]
Message-ID: <1436361268-234530-10-git-send-email-wangnan0@huawei.com> (raw)
In-Reply-To: <1436361268-234530-1-git-send-email-wangnan0@huawei.com>
Expand bpf_obj_elf_collect() to collect license and kernel version
information in eBPF object file. eBPF object file should have a section
named 'license', which contains a string. It should also have a section
named 'version', contains a u32 LINUX_VERSION_CODE.
bpf_obj_validate() is introduced to validate object file after loaded.
Currently it only check existence of 'version' section.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1435716878-189507-10-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/lib/bpf/libbpf.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index d8d6eb5..95c8d8e 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -14,6 +14,7 @@
#include <fcntl.h>
#include <errno.h>
#include <asm/unistd.h>
+#include <linux/kernel.h>
#include <linux/bpf.h>
#include <libelf.h>
#include <gelf.h>
@@ -78,6 +79,8 @@ void libbpf_set_print(libbpf_print_fn_t warn,
#endif
struct bpf_object {
+ char license[64];
+ u32 kern_version;
/*
* Information when doing elf related work. Only valid if fd
* is valid.
@@ -220,6 +223,33 @@ mismatch:
return -EINVAL;
}
+static int
+bpf_object__init_license(struct bpf_object *obj,
+ void *data, size_t size)
+{
+ memcpy(obj->license, data,
+ min(size, sizeof(obj->license) - 1));
+ pr_debug("license of %s is %s\n", obj->path, obj->license);
+ return 0;
+}
+
+static int
+bpf_object__init_kversion(struct bpf_object *obj,
+ void *data, size_t size)
+{
+ u32 kver;
+
+ if (size != sizeof(kver)) {
+ pr_warning("invalid kver section in %s\n", obj->path);
+ return -EINVAL;
+ }
+ memcpy(&kver, data, sizeof(kver));
+ obj->kern_version = kver;
+ pr_debug("kernel version of %s is %x\n", obj->path,
+ obj->kern_version);
+ return 0;
+}
+
static int bpf_object__elf_collect(struct bpf_object *obj)
{
Elf *elf = obj->efile.elf;
@@ -266,11 +296,32 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
name, (unsigned long)data->d_size,
(int)sh.sh_link, (unsigned long)sh.sh_flags,
(int)sh.sh_type);
+
+ if (strcmp(name, "license") == 0)
+ err = bpf_object__init_license(obj,
+ data->d_buf,
+ data->d_size);
+ else if (strcmp(name, "version") == 0)
+ err = bpf_object__init_kversion(obj,
+ data->d_buf,
+ data->d_size);
+ if (err)
+ goto out;
}
out:
return err;
}
+static int bpf_object__validate(struct bpf_object *obj)
+{
+ if (obj->kern_version == 0) {
+ pr_warning("%s doesn't provide kernel version\n",
+ obj->path);
+ return -EINVAL;
+ }
+ return 0;
+}
+
static struct bpf_object *
__bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz)
{
@@ -291,6 +342,8 @@ __bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz)
goto out;
if (bpf_object__elf_collect(obj))
goto out;
+ if (bpf_object__validate(obj))
+ goto out;
bpf_object__elf_finish(obj);
return obj;
--
1.8.3.4
next prev parent reply other threads:[~2015-07-08 13:23 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-08 13:13 [PATCH v11 00/39] perf tools: filtering events using eBPF programs - part1 Wang Nan
2015-07-08 13:13 ` [PATCH v11 01/39] bpf: Use correct #ifdef controller for trace_call_bpf() Wang Nan
2015-07-08 13:13 ` [PATCH v11 02/39] tracing, perf: Implement BPF programs attached to uprobes Wang Nan
2015-07-08 13:13 ` [PATCH v11 03/39] bpf tools: Introduce 'bpf' library and add bpf feature check Wang Nan
2015-07-08 13:13 ` [PATCH v11 04/39] bpf tools: Allow caller to set printing function Wang Nan
2015-07-08 13:13 ` [PATCH v11 05/39] bpf tools: Open eBPF object file and do basic validation Wang Nan
2015-07-08 13:13 ` [PATCH v11 06/39] bpf tools: Read eBPF object from buffer Wang Nan
2015-07-08 13:13 ` [PATCH v11 07/39] bpf tools: Check endianness and make libbpf fail early Wang Nan
2015-07-08 13:13 ` [PATCH v11 08/39] bpf tools: Iterate over ELF sections to collect information Wang Nan
2015-07-08 13:13 ` Wang Nan [this message]
2015-07-08 13:13 ` [PATCH v11 10/39] bpf tools: Collect map definitions from 'maps' section Wang Nan
2015-07-08 13:14 ` [PATCH v11 11/39] bpf tools: Collect symbol table from SHT_SYMTAB section Wang Nan
2015-07-08 13:14 ` [PATCH v11 12/39] bpf tools: Collect eBPF programs from their own sections Wang Nan
2015-07-08 13:14 ` [PATCH v11 13/39] bpf tools: Collect relocation sections from SHT_REL sections Wang Nan
2015-07-08 13:14 ` [PATCH v11 14/39] bpf tools: Record map accessing instructions for each program Wang Nan
2015-07-08 13:14 ` [PATCH v11 15/39] bpf tools: Add bpf.c/h for common bpf operations Wang Nan
2015-07-08 13:14 ` [PATCH v11 16/39] bpf tools: Create eBPF maps defined in an object file Wang Nan
2015-07-08 13:14 ` [PATCH v11 17/39] bpf tools: Relocate eBPF programs Wang Nan
2015-07-08 13:14 ` [PATCH v11 18/39] bpf tools: Introduce bpf_load_program() to bpf.c Wang Nan
2015-07-08 13:14 ` [PATCH v11 19/39] bpf tools: Load eBPF programs in object files into kernel Wang Nan
2015-07-08 13:14 ` [PATCH v11 20/39] bpf tools: Introduce accessors for struct bpf_program Wang Nan
2015-07-08 13:14 ` [PATCH v11 21/39] bpf tools: Introduce accessors for struct bpf_object Wang Nan
2015-07-08 13:14 ` [PATCH v11 22/39] bpf tools: Link all bpf objects onto a list Wang Nan
2015-07-08 13:14 ` [PATCH v11 23/39] perf tools: Introduce llvm config options Wang Nan
2015-07-08 13:14 ` [PATCH v11 24/39] perf tools: Call clang to compile C source to object code Wang Nan
2015-07-08 13:14 ` [PATCH v11 25/39] perf tools: Auto detecting kernel build directory Wang Nan
2015-07-08 13:14 ` [PATCH v11 26/39] perf tools: Auto detecting kernel include options Wang Nan
2015-07-08 13:14 ` [PATCH v11 27/39] perf tests: Add LLVM test for eBPF on-the-fly compiling Wang Nan
2015-07-08 13:14 ` [PATCH v11 28/39] perf tools: Make perf depend on libbpf Wang Nan
2015-07-08 19:44 ` Arnaldo Carvalho de Melo
2015-07-08 13:14 ` [PATCH v11 29/39] perf record: Enable passing bpf object file to --event Wang Nan
2015-07-08 13:14 ` [PATCH v11 30/39] perf record: Compile scriptlets if pass '.c' " Wang Nan
2015-07-08 13:14 ` [PATCH v11 31/39] perf tools: Parse probe points of eBPF programs during preparation Wang Nan
2015-07-08 13:14 ` [PATCH v11 32/39] perf probe: Attach trace_probe_event with perf_probe_event Wang Nan
2015-07-08 13:14 ` [PATCH v11 33/39] perf record: Probe at kprobe points Wang Nan
2015-07-08 13:14 ` [PATCH v11 34/39] perf record: Load all eBPF object into kernel Wang Nan
2015-07-08 13:14 ` [PATCH v11 35/39] perf tools: Add bpf_fd field to evsel and config it Wang Nan
2015-07-08 13:14 ` [PATCH v11 36/39] perf tools: Attach eBPF program to perf event Wang Nan
2015-07-08 13:14 ` [PATCH v11 37/39] perf tools: Suppress probing messages when probing by BPF loading Wang Nan
2015-07-08 13:14 ` [PATCH v11 38/39] perf record: Add clang options for compiling BPF scripts Wang Nan
2015-07-08 13:14 ` [PATCH v11 39/39] bpf tools: Load a program with different instance using preprocessor Wang Nan
2015-07-08 14:03 ` [PATCH v11 00/39] perf tools: filtering events using eBPF programs - part1 Arnaldo Carvalho de Melo
2015-07-08 15:57 ` pi3orama
2015-07-08 19:12 ` Arnaldo Carvalho de Melo
2015-07-08 20:53 ` Arnaldo Carvalho de Melo
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