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From d48981ad7e36abb3500161d823acf92345c94f5d Mon Sep 17 00:00:00 2001
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Message-Id: <d48981ad7e36abb3500161d823acf92345c94f5d.1571917458.git.pmatilai@redhat.com>
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In-Reply-To: <68d383c39cef8d58b80940b13dd132d3f41a03f0.1571917458.git.pmatilai@redhat.com>
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References: <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 16:07:56 +0300
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Subject: [PATCH 2/2] Support build-id generation from compressed ELF files
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(elfutils >= 0.175)
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Use dwelf_elf_begin() for reading ELF files for build-id generation on
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versions that have it to support compressed ELF files such as kernel
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modules (RhBug:1650072,1650074). Note that debugedit still cannot handle
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compressed files, this is only for build-id generation.
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---
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build/files.c | 4 ++++
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configure.ac | 4 ++++
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2 files changed, 8 insertions(+)
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diff --git a/build/files.c b/build/files.c
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index 3822be3d3..f72a7c866 100644
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--- a/build/files.c
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+++ b/build/files.c
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@@ -1828,7 +1828,11 @@ static int generateBuildIDs(FileList fl, ARGV_t *files)
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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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+#if HAVE_DWELF_ELF_BEGIN
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+ Elf *elf = dwelf_elf_begin(fd);
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+#else
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Elf *elf = elf_begin (fd, ELF_C_READ, NULL);
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+#endif
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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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diff --git a/configure.ac b/configure.ac
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index 99ce7df32..b2d7ed806 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -487,6 +487,10 @@ AS_IF([test "$WITH_LIBELF" = yes],[
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# If possible we also want the strtab functions from elfutils 0.167.
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# But we can fall back on the (unsupported) ebl alternatives if not.
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AC_CHECK_LIB(dw, dwelf_strtab_init, [HAVE_LIBDW_STRTAB=yes])
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+ # whether libdw supports compressed ELF objects
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+ AC_CHECK_LIB(dw, dwelf_elf_begin, [
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+ AC_DEFINE(HAVE_DWELF_ELF_BEGIN, 1, [Have dwelf_elf_begin?])
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+ ])
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])
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])
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])
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--
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2.21.0
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