From c61c2960d782c67566790b210163ff9c799f018a Mon Sep 17 00:00:00 2001
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From: Conrad Ratschan <ratschance@gmail.com>
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Date: Sat, 3 Oct 2020 20:17:24 -0500
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Subject: [PATCH] Fix endianness issues for powerpc PIE
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Previously when running `patchelf --set-rpath "/usr/sbin" my_bin` on a
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PIE ppc32 binary that had no RPATH a few issues were encountered.
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This commit fixes:
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1. The PT_PHDR being sorted improperly due to the type being read in
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incorrect endianness
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3. The interpreter being clobbered due to the replace sections routine
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reading sh_offset and sh_size in incorrect endianness
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4. The PHDR segment having an incorrect virt and phys address due to
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reading the e_phoff in the incorrect endianness
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This also fixes a read of the shdr.sh_type in writeReplacedSections but
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this was not encountered during testing.
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Fetch from: https://github.com/NixOS/patchelf/commit/884eccc4f061a3dbdbe63a4c73f1cc9bbf77fa7d
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Backported to v0.9. Removed item 2 from the fix list as it is not
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applicable to v0.9.
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Signed-off-by: Conrad Ratschan <conrad.ratschan@rockwellcollins.com>
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---
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src/patchelf.cc | 12 ++++++------
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1 file changed, 6 insertions(+), 6 deletions(-)
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diff --git a/src/patchelf.cc b/src/patchelf.cc
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index fa2945e..e60b17c 100644
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--- a/src/patchelf.cc
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+++ b/src/patchelf.cc
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@@ -173,8 +173,8 @@ private:
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ElfFile * elfFile;
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bool operator ()(const Elf_Phdr & x, const Elf_Phdr & y)
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{
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- if (x.p_type == PT_PHDR) return true;
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- if (y.p_type == PT_PHDR) return false;
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+ if (elfFile->rdi(x.p_type) == PT_PHDR) return true;
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+ if (elfFile->rdi(y.p_type) == PT_PHDR) return false;
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return elfFile->rdi(x.p_paddr) < elfFile->rdi(y.p_paddr);
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}
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};
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@@ -586,7 +586,7 @@ void ElfFile<ElfFileParamNames>::writeReplacedSections(Elf_Off & curOff,
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{
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string sectionName = i->first;
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Elf_Shdr & shdr = findSection(sectionName);
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- if (shdr.sh_type != SHT_NOBITS)
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+ if (rdi(shdr.sh_type) != SHT_NOBITS)
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memset(contents + rdi(shdr.sh_offset), 'X', rdi(shdr.sh_size));
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}
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@@ -667,9 +667,9 @@ void ElfFile<ElfFileParamNames>::rewriteSectionsLibrary()
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/* Some sections may already be replaced so account for that */
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unsigned int i = 1;
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Elf_Addr pht_size = sizeof(Elf_Ehdr) + (phdrs.size() + 1)*sizeof(Elf_Phdr);
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- while( shdrs[i].sh_offset <= pht_size && i < rdi(hdr->e_shnum) ) {
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+ while( rdi(shdrs[i].sh_offset) <= pht_size && i < rdi(hdr->e_shnum) ) {
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if (not haveReplacedSection(getSectionName(shdrs[i])))
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- replaceSection(getSectionName(shdrs[i]), shdrs[i].sh_size);
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+ replaceSection(getSectionName(shdrs[i]), rdi(shdrs[i].sh_size));
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i++;
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}
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@@ -723,7 +723,7 @@ void ElfFile<ElfFileParamNames>::rewriteSectionsLibrary()
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assert(curOff == startOffset + neededSpace);
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/* Write out the updated program and section headers */
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- rewriteHeaders(hdr->e_phoff);
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+ rewriteHeaders(rdi(hdr->e_phoff));
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}
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--
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2.17.1
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