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From 68d383c39cef8d58b80940b13dd132d3f41a03f0 Mon Sep 17 00:00:00 2001
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Message-Id: <68d383c39cef8d58b80940b13dd132d3f41a03f0.1571917458.git.pmatilai@redhat.com>
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From: Panu Matilainen <pmatilai@redhat.com>
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Date: Tue, 2 Apr 2019 15:22:07 +0300
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Subject: [PATCH 1/2] Detect kernel modules by .modinfo section presence for
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build-id generation
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File extension based heuristics only work so far at best, and break
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completely on compressed files with arbitrary .gz/.xz etc extension.
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This isn't supposed to change any behavior as such, only provide more
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reliable detection of kernel modules.
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---
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build/files.c | 27 ++++++++++++++++++++++++---
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1 file changed, 24 insertions(+), 3 deletions(-)
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diff --git a/build/files.c b/build/files.c
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index dbad9a7f3..3822be3d3 100644
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--- a/build/files.c
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+++ b/build/files.c
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@@ -1739,6 +1739,28 @@ static int addNewIDSymlink(ARGV_t *files,
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return rc;
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}
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+static int haveModinfo(Elf *elf)
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+{
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+ Elf_Scn * scn = NULL;
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+ size_t shstrndx;
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+ int have_modinfo = 0;
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+ const char *sname;
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+
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+ if (elf_getshdrstrndx(elf, &shstrndx) == 0) {
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+ while ((scn = elf_nextscn(elf, scn)) != NULL) {
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+ GElf_Shdr shdr_mem, *shdr = gelf_getshdr(scn, &shdr_mem);
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+ if (shdr == NULL)
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+ continue;
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+ sname = elf_strptr(elf, shstrndx, shdr->sh_name);
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+ if (sname && rstreq(sname, ".modinfo")) {
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+ have_modinfo = 1;
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+ break;
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+ }
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+ }
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+ }
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+ return have_modinfo;
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+}
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+
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static int generateBuildIDs(FileList fl, ARGV_t *files)
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{
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int rc = 0;
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@@ -1803,15 +1825,14 @@ static int generateBuildIDs(FileList fl, ARGV_t *files)
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int fd = open (flp->diskPath, O_RDONLY);
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if (fd >= 0) {
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/* Only real ELF files, that are ET_EXEC, ET_DYN or
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- kernel modules (ET_REL files with names ending in .ko)
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+ kernel modules (ET_REL files with .modinfo section)
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should have build-ids. */
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GElf_Ehdr ehdr;
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Elf *elf = elf_begin (fd, ELF_C_READ, NULL);
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if (elf != NULL && elf_kind(elf) == ELF_K_ELF
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&& gelf_getehdr(elf, &ehdr) != NULL
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&& (ehdr.e_type == ET_EXEC || ehdr.e_type == ET_DYN
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- || (ehdr.e_type == ET_REL
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- && rpmFileHasSuffix (flp->diskPath, ".ko")))) {
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+ || (ehdr.e_type == ET_REL && haveModinfo(elf)))) {
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const void *build_id;
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ssize_t len = dwelf_elf_gnu_build_id (elf, &build_id);
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/* len == -1 means error. Zero means no
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--
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2.21.0
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