audit: allow other filter list types for AUDIT_EXE

This patch removes the restriction of the AUDIT_EXE field to only
SYSCALL filter and teaches audit_filter to recognize this field.

This makes it possible to write rule lists such as:

    auditctl -a exit,always [some general rule]
    # Filter out events with executable name /bin/exe1 or /bin/exe2:
    auditctl -a exclude,always -F exe=/bin/exe1
    auditctl -a exclude,always -F exe=/bin/exe2

See: https://github.com/linux-audit/audit-kernel/issues/54

Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Reviewed-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index eaa320148d97..6db9847ca031 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -428,8 +428,6 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
         case AUDIT_EXE:
                 if (f->op != Audit_not_equal && f->op != Audit_equal)
                         return -EINVAL;
-                if (entry->rule.listnr != AUDIT_FILTER_EXIT)
-                        return -EINVAL;
                 break;
         }
         return 0;
@@ -1360,6 +1358,11 @@ int audit_filter(int msgtype, unsigned int listtype)
                                                         f->type, f->op, f->lsm_rule, NULL);
                                 }
                                 break;
+                        case AUDIT_EXE:
+                                result = audit_exe_compare(current, e->rule.exe);
+                                if (f->op == Audit_not_equal)
+                                        result = !result;
+                                break;
                         default:
                                 goto unlock_and_return;
                         }