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0.180-7 - Add elfutils-0.180-shf-compressed.patch

This commit is contained in:
Mark Wielaard 2020-08-26 00:11:50 +02:00
parent aff444d022
commit 510fcad8b0
2 changed files with 74 additions and 1 deletions
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68
elfutils-0.180-shf-compressed.patch Normal file
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@ -0,0 +1,68 @@
commit 55c5c9a568ed707bcea1388bf3a525212d8cf4b8
Author: Mark Wielaard <mark@klomp.org>
Date: Wed Aug 19 23:41:24 2020 +0200
libelf: Fixup SHF_COMPRESSED sh_addralign in elf_update if necessary.
In elf_getdata.c we have the following to compensate for possibly
bad sh_addralign values of compressed sections:
/* Compressed data has a header, but then compressed data.
Make sure to set the alignment of the header explicitly,
don't trust the file alignment for the section, it is
often wrong. */
if ((flags & SHF_COMPRESSED) != 0)
{
entsize = 1;
align = __libelf_type_align (elf->class, ELF_T_CHDR);
}
Which makes sure the d_data alignment is correct for the Chdr struct
at the start of the compressed section.
But this means that if a user just reads such a compressed section
without changing it, and then tries to write it out again using
elf_update they get an error message about d_align and sh_addralign
being out of sync.
We already correct obviously incorrect sh_entsize fields.
Do the same for the sh_addralign field of a SHF_COMPRESSED section.
Signed-off-by: Mark Wielaard <mark@klomp.org>
diff --git a/libelf/ChangeLog b/libelf/ChangeLog
index 8f6d2d2d..77044c1c 100644
--- a/libelf/ChangeLog
+++ b/libelf/ChangeLog
@@ -1,3 +1,8 @@
+2020-08-19 Mark Wielaard <mark@klomp.org>
+
+ * elf32_updatenull.c (updatenull_wrlock): Fixup the sh_addralign
+ of an SHF_COMPRESSED section if necessary.
+
2020-06-04 Mark Wielaard <mark@klomp.org>
* elf.h: Update from glibc.
diff --git a/libelf/elf32_updatenull.c b/libelf/elf32_updatenull.c
index 5f3cdbf6..d0d4d1eb 100644
--- a/libelf/elf32_updatenull.c
+++ b/libelf/elf32_updatenull.c
@@ -267,6 +267,18 @@ __elfw2(LIBELFBITS,updatenull_wrlock) (Elf *elf, int *change_bop, size_t shnum)
update_if_changed (shdr->sh_entsize, sh_entsize,
scn->shdr_flags);
+ /* Likewise for the alignment of a compressed section.
+ For a SHF_COMPRESSED section set the correct
+ sh_addralign value, which must match the d_align of
+ the data (see __libelf_set_rawdata in elf_getdata.c). */
+ if ((shdr->sh_flags & SHF_COMPRESSED) != 0)
+ {
+ sh_align = __libelf_type_align (ELFW(ELFCLASS,LIBELFBITS),
+ ELF_T_CHDR);
+ update_if_changed (shdr->sh_addralign, sh_align,
+ scn->shdr_flags);
+ }
+
if (scn->data_read == 0
&& __libelf_set_rawdata_wrlock (scn) != 0)
/* Something went wrong. The error value is already set. */

7
elfutils.spec
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@ -1,6 +1,6 @@
Name: elfutils
Version: 0.180
%global baserelease 4
%global baserelease 7
Release: %{baserelease}%{?dist}
URL: http://elfutils.org/
%global source_url ftp://sourceware.org/pub/elfutils/%{version}/
@ -56,6 +56,7 @@ BuildRequires: curl
# Patches
Patch1: elfutils-0.180-mhd-result.patch
Patch2: elfutils-0.180-shf-compressed.patch
%description
Elfutils is a collection of utilities, including stack (to show
@ -248,6 +249,7 @@ such servers to download those files on demand.
# Apply patches
%patch1 -p1 -b .mhd_result
%patch2 -p1 -b .shf_compressed
# In case the above patches added any new test scripts, make sure they
# are executable.
@ -432,6 +434,9 @@ exit 0
%systemd_postun_with_restart debuginfod.service
%changelog
* Tue Aug 25 2020 Mark Wielaard <mjw@fedoraproject.org> - 0.180-7
- Add elfutils-0.180-shf-compressed.patch
* Wed Jul 22 2020 Mark Wielaard <mjw@fedoraproject.org> - 0.180-5
- Remove duplicate listing of sysconfig/debuginfod (config) file.