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Support build-id generation from compressed ELF files (#1650072)

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This commit is contained in:
Panu Matilainen 2019-05-21 12:25:27 +03:00
parent 2688218e05
commit 3abc97620b
3 changed files with 127 additions and 1 deletions
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69
0001-Detect-kernel-modules-by-.modinfo-section-presence-f.patch Normal file
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@ -0,0 +1,69 @@
From 68d383c39cef8d58b80940b13dd132d3f41a03f0 Mon Sep 17 00:00:00 2001
Message-Id: <68d383c39cef8d58b80940b13dd132d3f41a03f0.1558430547.git.pmatilai@redhat.com>
From: Panu Matilainen <pmatilai@redhat.com>
Date: Tue, 2 Apr 2019 15:22:07 +0300
Subject: [PATCH 1/2] Detect kernel modules by .modinfo section presence for
build-id generation
File extension based heuristics only work so far at best, and break
completely on compressed files with arbitrary .gz/.xz etc extension.
This isn't supposed to change any behavior as such, only provide more
reliable detection of kernel modules.
---
build/files.c | 27 ++++++++++++++++++++++++---
1 file changed, 24 insertions(+), 3 deletions(-)
diff --git a/build/files.c b/build/files.c
index dbad9a7f3..3822be3d3 100644
--- a/build/files.c
+++ b/build/files.c
@@ -1739,6 +1739,28 @@ static int addNewIDSymlink(ARGV_t *files,
return rc;
}
+static int haveModinfo(Elf *elf)
+{
+ Elf_Scn * scn = NULL;
+ size_t shstrndx;
+ int have_modinfo = 0;
+ const char *sname;
+
+ if (elf_getshdrstrndx(elf, &shstrndx) == 0) {
+ while ((scn = elf_nextscn(elf, scn)) != NULL) {
+ GElf_Shdr shdr_mem, *shdr = gelf_getshdr(scn, &shdr_mem);
+ if (shdr == NULL)
+ continue;
+ sname = elf_strptr(elf, shstrndx, shdr->sh_name);
+ if (sname && rstreq(sname, ".modinfo")) {
+ have_modinfo = 1;
+ break;
+ }
+ }
+ }
+ return have_modinfo;
+}
+
static int generateBuildIDs(FileList fl, ARGV_t *files)
{
int rc = 0;
@@ -1803,15 +1825,14 @@ static int generateBuildIDs(FileList fl, ARGV_t *files)
int fd = open (flp->diskPath, O_RDONLY);
if (fd >= 0) {
/* Only real ELF files, that are ET_EXEC, ET_DYN or
- kernel modules (ET_REL files with names ending in .ko)
+ kernel modules (ET_REL files with .modinfo section)
should have build-ids. */
GElf_Ehdr ehdr;
Elf *elf = elf_begin (fd, ELF_C_READ, NULL);
if (elf != NULL && elf_kind(elf) == ELF_K_ELF
&& gelf_getehdr(elf, &ehdr) != NULL
&& (ehdr.e_type == ET_EXEC || ehdr.e_type == ET_DYN
- || (ehdr.e_type == ET_REL
- && rpmFileHasSuffix (flp->diskPath, ".ko")))) {
+ || (ehdr.e_type == ET_REL && haveModinfo(elf)))) {
const void *build_id;
ssize_t len = dwelf_elf_gnu_build_id (elf, &build_id);
/* len == -1 means error. Zero means no
--
2.21.0

52
0002-Support-build-id-generation-from-compressed-ELF-file.patch Normal file
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@ -0,0 +1,52 @@
From d48981ad7e36abb3500161d823acf92345c94f5d Mon Sep 17 00:00:00 2001
Message-Id: <d48981ad7e36abb3500161d823acf92345c94f5d.1558430547.git.pmatilai@redhat.com>
In-Reply-To: <68d383c39cef8d58b80940b13dd132d3f41a03f0.1558430547.git.pmatilai@redhat.com>
References: <68d383c39cef8d58b80940b13dd132d3f41a03f0.1558430547.git.pmatilai@redhat.com>
From: Panu Matilainen <pmatilai@redhat.com>
Date: Tue, 2 Apr 2019 16:07:56 +0300
Subject: [PATCH 2/2] Support build-id generation from compressed ELF files
(elfutils >= 0.175)
Use dwelf_elf_begin() for reading ELF files for build-id generation on
versions that have it to support compressed ELF files such as kernel
modules (RhBug:1650072,1650074). Note that debugedit still cannot handle
compressed files, this is only for build-id generation.
---
build/files.c | 4 ++++
configure.ac | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/build/files.c b/build/files.c
index 3822be3d3..f72a7c866 100644
--- a/build/files.c
+++ b/build/files.c
@@ -1828,7 +1828,11 @@ static int generateBuildIDs(FileList fl, ARGV_t *files)
kernel modules (ET_REL files with .modinfo section)
should have build-ids. */
GElf_Ehdr ehdr;
+#if HAVE_DWELF_ELF_BEGIN
+ Elf *elf = dwelf_elf_begin(fd);
+#else
Elf *elf = elf_begin (fd, ELF_C_READ, NULL);
+#endif
if (elf != NULL && elf_kind(elf) == ELF_K_ELF
&& gelf_getehdr(elf, &ehdr) != NULL
&& (ehdr.e_type == ET_EXEC || ehdr.e_type == ET_DYN
diff --git a/configure.ac b/configure.ac
index 99ce7df32..b2d7ed806 100644
--- a/configure.ac
+++ b/configure.ac
@@ -487,6 +487,10 @@ AS_IF([test "$WITH_LIBELF" = yes],[
# If possible we also want the strtab functions from elfutils 0.167.
# But we can fall back on the (unsupported) ebl alternatives if not.
AC_CHECK_LIB(dw, dwelf_strtab_init, [HAVE_LIBDW_STRTAB=yes])
+ # whether libdw supports compressed ELF objects
+ AC_CHECK_LIB(dw, dwelf_elf_begin, [
+ AC_DEFINE(HAVE_DWELF_ELF_BEGIN, 1, [Have dwelf_elf_begin?])
+ ])
])
])
])
--
2.21.0

7
rpm.spec
View File

@ -23,7 +23,7 @@
%global rpmver 4.14.2.1
#global snapver rc2
%global rel 9
%global rel 10
%global srcver %{version}%{?snapver:-%{snapver}}
%global srcdir %{?snapver:testing}%{!?snapver:%{name}-%(echo %{version} | cut -d'.' -f1-2).x}
@ -63,6 +63,8 @@ Patch104: 0001-Take-_prefix-into-account-when-compressing-man-pages.patch
Patch105: rpm-4.14.2-RPMTAG_MODULARITYLABEL.patch
Patch106: 0001-find-debuginfo.sh-Handle-position-independent-execut.patch
Patch107: 0001-Add-flag-to-use-strip-g-instead-of-full-strip-on-DSO.patch
Patch108: 0001-Detect-kernel-modules-by-.modinfo-section-presence-f.patch
Patch109: 0002-Support-build-id-generation-from-compressed-ELF-file.patch
# Python 3 string API sanity
Patch150: 0001-In-Python-3-return-all-our-string-data-as-surrogate-.patch
@ -578,6 +580,9 @@ make check || (cat tests/rpmtests.log; exit 1)
%doc doc/librpm/html/*
%changelog
* Tue May 21 2019 Panu Matilainen <pmatilai@redhat.com> - 4.14.2.1-10
- Support build-id generation from compressed ELF files (#1650072)
* Fri May 03 2019 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 4.14.2.1-9
- Suggest gdb-minimal