[patch 33/39] [PATCH] x86_64: Check for bad elf entry address

[Chris Wright <chrisw@sous-sol.org>]

-stable review patch.  If anyone has any objections, please let us know.
------------------

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: Chris Wright <chrisw@sous-sol.org>
---
 fs/binfmt_elf.c |    5 +++++
 1 files changed, 5 insertions(+)

--- linux-2.6.15.4.orig/fs/binfmt_elf.c
+++ linux-2.6.15.4/fs/binfmt_elf.c
@@ -932,6 +932,11 @@ static int load_elf_binary(struct linux_
 		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);

--
-
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