77 lines
4.4 KiB
Diff
77 lines
4.4 KiB
Diff
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From 3781df9da23840e596d5e9e8493f22666802fe6c Mon Sep 17 00:00:00 2001
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From: John Reiser <jreiser@BitWagon.com>
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Date: Fri, 11 Dec 2020 13:38:18 -0800
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Subject: [PATCH] Check DT_REL/DT_RELA, DT_RELSZ/DT_RELASZ
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https://github.com/upx/upx/issues/421
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modified: p_lx_elf.cpp
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---
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src/p_lx_elf.cpp | 34 +++++++++++++++++++++++++++++-----
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1 file changed, 29 insertions(+), 5 deletions(-)
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diff --git a/src/p_lx_elf.cpp b/src/p_lx_elf.cpp
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index 182db192..3a4101cf 100644
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--- a/src/p_lx_elf.cpp
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+++ b/src/p_lx_elf.cpp
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@@ -2222,8 +2222,20 @@ bool PackLinuxElf32::canPack()
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int z_rsz = dt_table[Elf32_Dyn::DT_RELSZ];
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if (z_rel && z_rsz) {
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unsigned rel_off = get_te32(&dynseg[-1+ z_rel].d_val);
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+ if ((unsigned)file_size <= rel_off) {
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+ char msg[70]; snprintf(msg, sizeof(msg),
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+ "bad Elf32_Dynamic[DT_REL] %#x\n",
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+ rel_off);
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+ throwCantPack(msg);
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+ }
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Elf32_Rel *rp = (Elf32_Rel *)&file_image[rel_off];
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unsigned relsz = get_te32(&dynseg[-1+ z_rsz].d_val);
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+ if ((unsigned)file_size <= relsz) {
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+ char msg[70]; snprintf(msg, sizeof(msg),
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+ "bad Elf32_Dynamic[DT_RELSZ] %#x\n",
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+ relsz);
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+ throwCantPack(msg);
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+ }
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Elf32_Rel *last = (Elf32_Rel *)(relsz + (char *)rp);
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for (; rp < last; ++rp) {
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unsigned r_va = get_te32(&rp->r_offset);
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@@ -2562,14 +2574,26 @@ PackLinuxElf64::canPack()
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int z_rel = dt_table[Elf64_Dyn::DT_RELA];
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int z_rsz = dt_table[Elf64_Dyn::DT_RELASZ];
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if (z_rel && z_rsz) {
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- unsigned rel_off = get_te64(&dynseg[-1+ z_rel].d_val);
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+ upx_uint64_t rel_off = get_te64(&dynseg[-1+ z_rel].d_val);
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+ if ((u64_t)file_size <= rel_off) {
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+ char msg[70]; snprintf(msg, sizeof(msg),
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+ "bad Elf64_Dynamic[DT_RELA] %#llx\n",
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+ rel_off);
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+ throwCantPack(msg);
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+ }
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Elf64_Rela *rp = (Elf64_Rela *)&file_image[rel_off];
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- unsigned relsz = get_te64(&dynseg[-1+ z_rsz].d_val);
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+ upx_uint64_t relsz = get_te64(&dynseg[-1+ z_rsz].d_val);
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+ if ((u64_t)file_size <= relsz) {
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+ char msg[70]; snprintf(msg, sizeof(msg),
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+ "bad Elf64_Dynamic[DT_RELASZ] %#llx\n",
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+ relsz);
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+ throwCantPack(msg);
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+ }
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Elf64_Rela *last = (Elf64_Rela *)(relsz + (char *)rp);
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for (; rp < last; ++rp) {
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- unsigned r_va = get_te64(&rp->r_offset);
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+ upx_uint64_t r_va = get_te64(&rp->r_offset);
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if (r_va == user_init_ava) { // found the Elf64_Rela
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- unsigned r_info = get_te64(&rp->r_info);
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+ upx_uint64_t r_info = get_te64(&rp->r_info);
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unsigned r_type = ELF64_R_TYPE(r_info);
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if (Elf64_Ehdr::EM_AARCH64 == e_machine
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&& R_AARCH64_RELATIVE == r_type) {
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@@ -2581,7 +2605,7 @@ PackLinuxElf64::canPack()
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}
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else {
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char msg[50]; snprintf(msg, sizeof(msg),
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- "bad relocation %#x DT_INIT_ARRAY[0]",
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+ "bad relocation %#llx DT_INIT_ARRAY[0]",
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r_info);
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throwCantPack(msg);
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}
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