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Abandon when outrageous Elf64_Dyn.d_tag

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https://github.com/upx/upx/issues/235  POC8
	modified:   p_lx_elf.cpp
This commit is contained in:
John Reiser
2018-12-15 19:35:13 -08:00
parent 780a4347b8
commit 91b81b587b
1 changed files with 5 additions and 0 deletions
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src/p_lx_elf.cpp
+5
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@@ -4690,6 +4690,11 @@ PackLinuxElf64::invert_pt_dynamic(Elf64_Dyn const *dynp)
if (dynp) if (dynp)
for (; ; ++ndx, ++dynp) { for (; ; ++ndx, ++dynp) {
upx_uint64_t const d_tag = get_te64(&dynp->d_tag); upx_uint64_t const d_tag = get_te64(&dynp->d_tag);
if (d_tag>>32) { // outrageous
char msg[50]; snprintf(msg, sizeof(msg),
"bad Elf64_Dyn[%d].d_tag %#lx", -1+ ndx, (long unsigned)d_tag);
throwCantPack(msg);
}
if (d_tag < DT_NUM) { if (d_tag < DT_NUM) {
dt_table[d_tag] = ndx; dt_table[d_tag] = ndx;
} }