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Merge pull request #83582 from augusto2112/fix-elf-shnum

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[RemoteInspection] Handle special case of large amount of ELF sections.
This commit is contained in:
Augusto Noronha
2025-10-24 13:21:41 -07:00
committed by GitHub
parent eb23d3bc0a e9cb50efe8
commit 77db003169
1 changed files with 20 additions and 0 deletions
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20
include/swift/RemoteInspection/ReflectionContext.h
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@@ -565,6 +565,26 @@ public:
if (sizeof(typename T::Section) > SectionEntrySize)
return {};
// Special handling for large amount of sections.
// From the elf man page, describing e_shnum:
//
// If the number of entries in the section header table is
// larger than or equal to SHN_LORESERVE (0xff00), e_shnum
// holds the value zero and the real number of entries in the
// section header table is held in the sh_size member of the
// initial entry in section header table. Otherwise, the
// sh_size member of the initial entry in the section header
// table holds the value zero.
if (SectionHdrNumEntries == 0 && SectionEntrySize > 0) {
auto SecBuf = readData(SectionHdrAddress, sizeof(typename T::Section));
if (!SecBuf)
return {};
const typename T::Section *FirstSectHdr =
reinterpret_cast<const typename T::Section *>(SecBuf);
SectionHdrNumEntries = FirstSectHdr->sh_size;
}
if (SectionHdrNumEntries == 0)
return {};