From: Suresh Siddha <suresh.b.siddha@intel.com>
Date: Sun, 26 Feb 2006 03:18:28 +0000 (+0100)
Subject: [PATCH] x86_64: Check for bad elf entry address.
X-Git-Tag: MMI-PSA29.97-13-9~51850
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5342fba5412cead88b61ead07168615dbeba1ee3;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

[PATCH] x86_64: Check for bad elf entry address.

Fixes a local DOS on Intel systems that lead to an endless
recursive fault.  AMD machines don't seem to be affected.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 1b117a441298..c2eac2a50bd2 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -938,6 +938,11 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
 		kfree(elf_interpreter);
 	} else {
 		elf_entry = loc->elf_ex.e_entry;
+		if (BAD_ADDR(elf_entry)) {
+			send_sig(SIGSEGV, current, 0);
+			retval = -ENOEXEC; /* Nobody gets to see this, but.. */
+			goto out_free_dentry;
+		}
 	}
 
 	kfree(elf_phdata);