fix prctl privilege escalation and suid_dumpable (CVE-2006-2451)
Based on a patch from Ernie Petrides
During security research, Red Hat discovered a behavioral flaw in core
dump handling. A local user could create a program that would cause a
core file to be dumped into a directory they would not normally have
permissions to write to. This could lead to a denial of service (disk
consumption), or allow the local user to gain root privileges.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/kernel/sys.c b/kernel/sys.c
index 105e102..413706a 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1802,7 +1802,7 @@
error = current->mm->dumpable;
break;
case PR_SET_DUMPABLE:
- if (arg2 < 0 || arg2 > 2) {
+ if (arg2 < 0 || arg2 > 1) {
error = -EINVAL;
break;
}
