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From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andriin@fb.com>
Cc: dwarves@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, Yonghong Song <yhs@fb.com>,
	Hao Luo <haoluo@google.com>, Martin KaFai Lau <kafai@fb.com>,
	Song Liu <songliubraving@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@chromium.org>,
	Joe Lawrence <joe.lawrence@redhat.com>,
	Mark Wielaard <mjw@redhat.com>
Subject: [PATCH 1/3] elf_symtab: Add support for SHN_XINDEX index to elf_section_by_name
Date: Thu, 21 Jan 2021 21:22:01 +0100	[thread overview]
Message-ID: <20210121202203.9346-2-jolsa@kernel.org> (raw)
In-Reply-To: <20210121202203.9346-1-jolsa@kernel.org>

In case the elf's header e_shstrndx contains SHN_XINDEX,
we need to call elf_getshdrstrndx to get the proper
string table index.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 dutil.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/dutil.c b/dutil.c
index 7b667647420f..9e0fdca3ae04 100644
--- a/dutil.c
+++ b/dutil.c
@@ -179,13 +179,17 @@ Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 {
 	Elf_Scn *sec = NULL;
 	size_t cnt = 1;
+	size_t str_idx;
+
+	if (elf_getshdrstrndx(elf, &str_idx))
+		return NULL;
 
 	while ((sec = elf_nextscn(elf, sec)) != NULL) {
 		char *str;
 
 		gelf_getshdr(sec, shp);
-		str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
-		if (!strcmp(name, str)) {
+		str = elf_strptr(elf, str_idx, shp->sh_name);
+		if (str && !strcmp(name, str)) {
 			if (index)
 				*index = cnt;
 			break;
-- 
2.27.0


  reply	other threads:[~2021-01-21 20:24 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-21 20:22 [PATCHv2 0/3] dwarves,libbpf: Add support to use optional extended section index table Jiri Olsa
2021-01-21 20:22 ` Jiri Olsa [this message]
2021-01-21 23:10   ` [PATCH 1/3] elf_symtab: Add support for SHN_XINDEX index to elf_section_by_name Andrii Nakryiko
2021-01-21 23:34     ` Jiri Olsa
2021-01-21 20:22 ` [PATCH 2/3] bpf_encoder: Translate SHN_XINDEX in symbol's st_shndx values Jiri Olsa
2021-01-21 23:32   ` Andrii Nakryiko
2021-01-22  9:32     ` Jiri Olsa
2021-01-22 20:46     ` Jiri Olsa
2021-01-22 22:55       ` Andrii Nakryiko
2021-01-23 18:51         ` Jiri Olsa
2021-01-23 20:07           ` Andrii Nakryiko
2021-01-23 20:21             ` Mark Wielaard
2021-01-23 20:08           ` Mark Wielaard
2021-01-23 20:15             ` Jiri Olsa
2021-01-23 21:23     ` Jiri Olsa
2021-01-24  6:08       ` Andrii Nakryiko
2021-01-21 20:22 ` [PATCH bpf-next 3/3] libbpf: Use string table index from index table if needed Jiri Olsa
2021-01-21 23:46   ` Andrii Nakryiko
  -- strict thread matches above, loose matches on Subject: below --
2021-01-19 22:12 [PATCH 0/3] dwarves,libbpf: Add support to use optional extended section index table Jiri Olsa
2021-01-19 22:12 ` [PATCH 1/3] elf_symtab: Add support for SHN_XINDEX index to elf_section_by_name Jiri Olsa
2021-01-20  1:23   ` Andrii Nakryiko
2021-01-20 12:20     ` Jiri Olsa

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