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From b99e034e9696f745d8da4742251bb538e0841f63 Mon Sep 17 00:00:00 2001
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From: Alan Modra <amodra@gmail.com>
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Date: Sun, 8 Nov 2015 09:29:00 -0800
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Subject: [PATCH 05/11] ELF unexec: Symbol table patching
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No st_shndx value larger than SHN_LORESERVE should be changed.
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* unexelf.c (unexec): Don't adjust any st_shndx larger than
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SHN_LORESERVE. Error on SHN_XINDEX.
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---
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src/unexelf.c | 9 +++++----
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1 file changed, 5 insertions(+), 4 deletions(-)
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diff --git a/src/unexelf.c b/src/unexelf.c
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index 0065491..286ba2e 100644
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--- a/src/unexelf.c
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+++ b/src/unexelf.c
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@@ -1118,7 +1118,7 @@ temacs:
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}
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#endif /* __sgi */
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- /* If it is the symbol table, its st_shndx field needs to be patched. */
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+ /* Patch st_shndx field of symbol table. */
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if (new_shdr->sh_type == SHT_SYMTAB
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|| new_shdr->sh_type == SHT_DYNSYM)
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{
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@@ -1126,9 +1126,10 @@ temacs:
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ElfW (Sym) *sym = (ElfW (Sym) *) (new_shdr->sh_offset + new_base);
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for (; num--; sym++)
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{
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- if ((sym->st_shndx == SHN_UNDEF)
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- || (sym->st_shndx == SHN_ABS)
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- || (sym->st_shndx == SHN_COMMON))
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+ if (sym->st_shndx == SHN_XINDEX)
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+ fatal ("SHT_SYMTAB_SHNDX unsupported");
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+ if (sym->st_shndx == SHN_UNDEF
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+ || sym->st_shndx >= SHN_LORESERVE)
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continue;
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PATCH_INDEX (sym->st_shndx);
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--
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2.7.4
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