From 6f7ac603f2e041fded7be32f28f4c7e1ade691b3 Mon Sep 17 00:00:00 2001
From: Lionel Sambuc <lionel@minix3.org>
Date: Mon, 8 Sep 2014 10:16:41 +0200
Subject: [PATCH] Allow elf_unpack to withstand invalid ELF headers

Change-Id: I10a0f3111176b9614b8531d6736e2e860eb95ce4
---
 minix/lib/libexec/exec_elf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/minix/lib/libexec/exec_elf.c b/minix/lib/libexec/exec_elf.c
index f6d8d21cd..fca784aeb 100644
--- a/minix/lib/libexec/exec_elf.c
+++ b/minix/lib/libexec/exec_elf.c
@@ -58,7 +58,8 @@ static int elf_ph_sane(Elf_Phdr *phdr)
 static int elf_unpack(char *exec_hdr,
 	int hdr_len, Elf_Ehdr **hdr, Elf_Phdr **phdr)
 {
-  assert(hdr_len >= sizeof(Elf_Ehdr));
+  if(hdr_len < sizeof(Elf_Ehdr))
+	return ENOEXEC;
 
   *hdr = (Elf_Ehdr *) exec_hdr;
   if(!elf_sane(*hdr)) {
-- 
2.44.0