From: Jiri Olsa <olsajiri@gmail.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
bpf@vger.kernel.org, Martin KaFai Lau <kafai@fb.com>,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>
Subject: Re: [PATCHv3 bpf-next 08/26] libbpf: Add elf_open/elf_close functions
Date: Tue, 11 Jul 2023 11:01:49 +0200 [thread overview]
Message-ID: <ZK0affmyyb6v8HMm@krava> (raw)
In-Reply-To: <CAEf4BzaT8-81ooHjgwmR8F+e9++ZewdXJMGqVfFi+y-g4BFYww@mail.gmail.com>
On Thu, Jul 06, 2023 at 04:09:29PM -0700, Andrii Nakryiko wrote:
> On Fri, Jun 30, 2023 at 1:35 AM Jiri Olsa <jolsa@kernel.org> wrote:
> >
> > Adding elf_open/elf_close functions and using it in
> > elf_find_func_offset_from_file function. It will be
> > used in following changes to save some common code.
> >
> > Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> > ---
> > tools/lib/bpf/elf.c | 59 +++++++++++++++++++++++++-------------
> > tools/lib/bpf/libbpf_elf.h | 8 ++++++
> > tools/lib/bpf/usdt.c | 31 ++++++--------------
> > 3 files changed, 56 insertions(+), 42 deletions(-)
> >
>
> one nit below
>
> Acked-by: Andrii Nakryiko <andrii@kernel.org>
>
> > diff --git a/tools/lib/bpf/elf.c b/tools/lib/bpf/elf.c
> > index 2b62b4af28ce..74e35071d22e 100644
> > --- a/tools/lib/bpf/elf.c
> > +++ b/tools/lib/bpf/elf.c
> > @@ -11,6 +11,40 @@
> >
> > #define STRERR_BUFSIZE 128
> >
> > +int elf_open(const char *binary_path, struct elf_fd *elf_fd)
> > +{
> > + char errmsg[STRERR_BUFSIZE];
> > + int fd, ret;
> > + Elf *elf;
> > +
> > + if (elf_version(EV_CURRENT) == EV_NONE) {
> > + pr_warn("elf: failed to init libelf for %s\n", binary_path);
> > + return -LIBBPF_ERRNO__LIBELF;
> > + }
> > + fd = open(binary_path, O_RDONLY | O_CLOEXEC);
> > + if (fd < 0) {
> > + ret = -errno;
> > + pr_warn("elf: failed to open %s: %s\n", binary_path,
> > + libbpf_strerror_r(ret, errmsg, sizeof(errmsg)));
> > + return ret;
> > + }
> > + elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
> > + if (!elf) {
> > + pr_warn("elf: could not read elf from %s: %s\n", binary_path, elf_errmsg(-1));
> > + close(fd);
> > + return -LIBBPF_ERRNO__FORMAT;
> > + }
> > + elf_fd->fd = fd;
> > + elf_fd->elf = elf;
> > + return 0;
> > +}
> > +
> > +void elf_close(struct elf_fd *elf_fd)
> > +{
> > + elf_end(elf_fd->elf);
> > + close(elf_fd->fd);
>
> nit: I'd make elf_close() work correctly with a) NULL elf_fd and b)
right, ok
> NULL elf_fd->elf, just to never have to think about this
there's NULL check in elf_end
thanks,
jirka
next prev parent reply other threads:[~2023-07-11 9:02 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-30 8:33 [PATCHv3 bpf-next 00/26] bpf: Add multi uprobe link Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 01/26] bpf: Add attach_type checks under bpf_prog_attach_check_attach_type Jiri Olsa
2023-07-06 22:34 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 02/26] bpf: Add multi uprobe link Jiri Olsa
2023-07-06 22:34 ` Andrii Nakryiko
2023-07-11 9:00 ` Jiri Olsa
2023-07-07 4:22 ` Andrii Nakryiko
2023-07-11 9:01 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 03/26] bpf: Add cookies support for uprobe_multi link Jiri Olsa
2023-07-01 3:40 ` Yafang Shao
2023-07-01 8:54 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 04/26] bpf: Add pid filter " Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 05/26] bpf: Add bpf_get_func_ip helper support for uprobe link Jiri Olsa
2023-07-06 22:29 ` Andrii Nakryiko
2023-07-10 7:24 ` Jiri Olsa
2023-07-10 17:55 ` Andrii Nakryiko
2023-07-11 8:28 ` Jiri Olsa
2023-07-11 16:57 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 06/26] libbpf: Add uprobe_multi attach type and link names Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 07/26] libbpf: Move elf_find_func_offset* functions to elf object Jiri Olsa
2023-07-06 23:02 ` Andrii Nakryiko
2023-07-11 9:05 ` Jiri Olsa
2023-07-11 17:01 ` Andrii Nakryiko
2023-07-06 23:03 ` Andrii Nakryiko
2023-07-11 9:05 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 08/26] libbpf: Add elf_open/elf_close functions Jiri Olsa
2023-07-06 23:09 ` Andrii Nakryiko
2023-07-11 9:01 ` Jiri Olsa [this message]
2023-06-30 8:33 ` [PATCHv3 bpf-next 09/26] libbpf: Add elf symbol iterator Jiri Olsa
2023-07-06 23:24 ` Andrii Nakryiko
2023-07-11 9:03 ` Jiri Olsa
2023-07-11 16:59 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 10/26] libbpf: Add elf_resolve_syms_offsets function Jiri Olsa
2023-07-07 3:48 ` Andrii Nakryiko
2023-07-11 9:04 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 11/26] libbpf: Add elf_resolve_pattern_offsets function Jiri Olsa
2023-07-07 3:52 ` Andrii Nakryiko
2023-07-11 9:04 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 12/26] libbpf: Add bpf_link_create support for multi uprobes Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 13/26] libbpf: Add bpf_program__attach_uprobe_multi function Jiri Olsa
2023-07-07 4:05 ` Andrii Nakryiko
2023-07-11 9:05 ` Jiri Olsa
2023-07-11 17:02 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 14/26] libbpf: Add support for u[ret]probe.multi[.s] program sections Jiri Olsa
2023-07-07 4:07 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 15/26] libbpf: Add uprobe multi link detection Jiri Olsa
2023-07-07 4:20 ` Andrii Nakryiko
2023-07-11 9:03 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 16/26] libbpf: Add uprobe multi link support to bpf_program__attach_usdt Jiri Olsa
2023-07-07 4:29 ` Andrii Nakryiko
2023-07-11 9:04 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 17/26] selftests/bpf: Add uprobe_multi skel test Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 18/26] selftests/bpf: Add uprobe_multi api test Jiri Olsa
2023-07-07 4:32 ` Andrii Nakryiko
2023-07-11 9:06 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 19/26] selftests/bpf: Add uprobe_multi link test Jiri Olsa
2023-07-07 4:33 ` Andrii Nakryiko
2023-07-11 9:06 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 20/26] selftests/bpf: Add uprobe_multi test program Jiri Olsa
2023-07-07 4:35 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 21/26] selftests/bpf: Add uprobe_multi bench test Jiri Olsa
2023-07-07 4:38 ` Andrii Nakryiko
2023-07-11 9:07 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 22/26] selftests/bpf: Add usdt_multi test program Jiri Olsa
2023-07-07 4:39 ` Andrii Nakryiko
2023-06-30 8:33 ` [PATCHv3 bpf-next 23/26] selftests/bpf: Add usdt_multi bench test Jiri Olsa
2023-07-07 4:42 ` Andrii Nakryiko
2023-07-11 9:07 ` Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 24/26] selftests/bpf: Add uprobe_multi cookie test Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 25/26] selftests/bpf: Add uprobe_multi pid filter tests Jiri Olsa
2023-06-30 8:33 ` [PATCHv3 bpf-next 26/26] selftests/bpf: Add extra link to uprobe_multi tests Jiri Olsa
2023-07-05 12:45 ` [PATCHv3 bpf-next 00/26] bpf: Add multi uprobe link Daniel Borkmann
2023-07-05 19:10 ` Jiri Olsa
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