118 lines
4.3 KiB
Diff
118 lines
4.3 KiB
Diff
From 5598e24ef8aef14727ff72eea71ec460200bc2e3 Mon Sep 17 00:00:00 2001
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From: Mark Wielaard <mark@klomp.org>
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Date: Fri, 17 Mar 2017 21:03:35 +0100
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Subject: [PATCH] debugedit: Fix cross-endian build-id reading and updating
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section data.
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debugedit doesn't read raw mmap data any longer. Which made the complex
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way to read the build-id unnecessary (and it was broken for cross-endian).
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Just use gelf_getnote to read the notes.
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Also in some special cases when only the debug_info or build_id data
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was updated, but no section changed size and we had to preserve the
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allocated section headers we could hit a bug in elfutils that could
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trash some section data in case there were gaps between non-dirty and
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dirty sections. See https://sourceware.org/bugzilla/show_bug.cgi?id=21199
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Add a workaround for that issue.
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This fixes the kompose package build on fedora ppc64.
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And makes it possible to replicate that issue on x86_64.
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Signed-off-by: Mark Wielaard <mark@klomp.org>
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(cherry picked from commit a6e767600309bdb1f8af33b44563a1187fb0dbc4)
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---
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tools/debugedit.c | 63 +++++++++++++++++++++++++++----------------------------
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1 file changed, 31 insertions(+), 32 deletions(-)
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diff --git a/tools/debugedit.c b/tools/debugedit.c
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index 87a423fdb..0f373162d 100644
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--- a/tools/debugedit.c
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+++ b/tools/debugedit.c
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@@ -2581,40 +2581,25 @@ main (int argc, char *argv[])
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break;
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case SHT_NOTE:
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if (do_build_id
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- && build_id == NULL && (dso->shdr[i].sh_flags & SHF_ALLOC))
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+ && build_id == 0 && (dso->shdr[i].sh_flags & SHF_ALLOC))
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{
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/* Look for a build-ID note here. */
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+ size_t off = 0;
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+ GElf_Nhdr nhdr;
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+ size_t name_off;
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+ size_t desc_off;
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Elf_Data *data = elf_getdata (elf_getscn (dso->elf, i), NULL);
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- Elf32_Nhdr nh;
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- Elf_Data dst =
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- {
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- .d_version = EV_CURRENT, .d_type = ELF_T_NHDR,
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- .d_buf = &nh, .d_size = sizeof nh
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- };
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- Elf_Data src = dst;
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- src.d_buf = data->d_buf;
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- assert (sizeof (Elf32_Nhdr) == sizeof (Elf64_Nhdr));
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- while ((char *) data->d_buf + data->d_size -
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- (char *) src.d_buf > (int) sizeof nh
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- && elf32_xlatetom (&dst, &src, dso->ehdr.e_ident[EI_DATA]))
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- {
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- Elf32_Word len = sizeof nh + nh.n_namesz;
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- len = (len + 3) & ~3;
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-
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- if (nh.n_namesz == sizeof "GNU" && nh.n_type == 3
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- && !memcmp ((char *) src.d_buf + sizeof nh, "GNU", sizeof "GNU"))
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- {
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- build_id = data;
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- build_id_offset = (char *) src.d_buf + len -
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- (char *) data->d_buf;
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- build_id_size = nh.n_descsz;
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- break;
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- }
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-
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- len += nh.n_descsz;
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- len = (len + 3) & ~3;
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- src.d_buf = (char *) src.d_buf + len;
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- }
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+ while ((off = gelf_getnote (data, off,
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+ &nhdr, &name_off, &desc_off)) > 0)
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+ if (nhdr.n_type == NT_GNU_BUILD_ID
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+ && nhdr.n_namesz == sizeof "GNU"
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+ && (memcmp ((char *)data->d_buf + name_off, "GNU",
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+ sizeof "GNU") == 0))
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+ {
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+ build_id = data;
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+ build_id_offset = desc_off;
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+ build_id_size = nhdr.n_descsz;
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+ }
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}
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break;
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default:
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@@ -2622,6 +2607,20 @@ main (int argc, char *argv[])
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}
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}
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+ /* Normally we only need to explicitly update the section headers
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+ and data when any section data changed size. But because of a bug
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+ in elfutils before 0.169 we will have to update and write out all
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+ section data if any data has changed (when ELF_F_LAYOUT was
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+ set). https://sourceware.org/bugzilla/show_bug.cgi?id=21199 */
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+ bool need_update = need_strp_update || need_stmt_update;
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+
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+#if !_ELFUTILS_PREREQ (0, 169)
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+ /* string replacements or build_id updates don't change section size. */
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+ need_update = (need_update
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+ || need_string_replacement
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+ || (do_build_id && build_id != NULL));
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+#endif
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+
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/* We might have changed the size of some debug sections. If so make
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sure the section headers are updated and the data offsets are
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correct. We set ELF_F_LAYOUT above because we don't want libelf
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@@ -2631,7 +2630,7 @@ main (int argc, char *argv[])
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anything for the phdrs allocated sections. Keep the offset of
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allocated sections so they are at the same place in the file. Add
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unallocated ones after the allocated ones. */
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- if (dso->phnum != 0 && (need_strp_update || need_stmt_update))
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+ if (dso->phnum != 0 && need_update)
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{
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Elf *elf = dso->elf;
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GElf_Off last_offset;
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