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Changes to allow POMP handle guard pages correctly #2

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4666c3a
Update process_thread.c
anonymous-patcher Mar 30, 2020
d655811
Update access_memory.c
anonymous-patcher Mar 30, 2020
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7 changes: 7 additions & 0 deletions reverse-from-coredump/src/access_memory.c
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Original file line number Diff line number Diff line change
Expand Up @@ -189,6 +189,13 @@ int address_writable(elf_core_info* core_info, Elf32_Addr address){
return (core_info->phdr[segment].p_flags & PF_W) ? 1:0;
}

int address_readable(elf_core_info* core_info, Elf32_Addr address){
int segment;
if((segment = address_segment(core_info, address))<0)
return 0;
return (core_info->phdr[segment].p_flags & PF_R) ? 1:0;
}

int addr_in_segment(GElf_Phdr phdr, Elf32_Addr addr){
if(addr >= phdr.p_vaddr && addr < phdr.p_vaddr + phdr.p_memsz)
return 1;
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4 changes: 4 additions & 0 deletions reverse-from-coredump/src/process_thread.c
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,10 @@ int single_op_legal_access(x86_insn_t *insn, x86_op_t *opd, struct elf_prstatus
if ((opd -> access & op_write) && (!address_writable(core_info, target))) {
legal = 0;
}

if ((opd -> access & op_read) && (!address_readable(core_info, target))) {
legal = 0;
}
}
return legal;
}
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