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Bug in handling DT_GNU_HASH table.

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Fix includes a more-general and stronger heuristic to find the end of
GNU_HASH table when there is no ElfXX_Shdr for it.  64-bit only for now.
(This is needed to help prevent SIGSEGV when processing tampered .exe.)

https://github.com/upx/upx/issues/577
	modified:   p_elf_enum.h
	modified:   p_lx_elf.cpp
	modified:   p_lx_elf.h
This commit is contained in:
John Reiser
2022-05-30 14:24:21 -07:00
committed by Markus F.X.J. Oberhumer
parent 4ae75375e0
commit 03436d2415
3 changed files with 134 additions and 34 deletions
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src/p_lx_elf.h
+4 -4
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@@ -190,8 +190,8 @@ protected:
unsigned page_mask; // AND clears the offset-within-page
Elf32_Dyn const *dynseg; // from PT_DYNAMIC
unsigned int const *hashtab; // from DT_HASH
unsigned int const *gashtab; // from DT_GNU_HASH
unsigned int const *hashtab, *hashend; // from DT_HASH
unsigned int const *gashtab, *gashend; // from DT_GNU_HASH
Elf32_Sym const *dynsym; // from DT_SYMTAB
Elf32_Sym const *jni_onload_sym;
@@ -342,8 +342,8 @@ protected:
upx_uint64_t page_mask; // AND clears the offset-within-page
Elf64_Dyn const *dynseg; // from PT_DYNAMIC
unsigned int const *hashtab; // from DT_HASH
unsigned int const *gashtab; // from DT_GNU_HASH
unsigned int const *hashtab, *hashend; // from DT_HASH
unsigned int const *gashtab, *gashend; // from DT_GNU_HASH
Elf64_Sym const *dynsym; // from DT_SYMTAB
Elf64_Sym const *jni_onload_sym;