Commit b34b0393 authored by Eric Paris's avatar Eric Paris Committed by Al Viro

audit: complex interfield comparison helper

Rather than code the same loop over and over implement a helper function which
uses some pointer magic to make it generic enough to be used numerous places
as we implement more audit interfield comparisons
Signed-off-by: default avatarEric Paris <eparis@redhat.com>
parent 02d86a56
...@@ -463,25 +463,53 @@ static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree) ...@@ -463,25 +463,53 @@ static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
return 0; return 0;
} }
static int audit_field_compare(struct task_struct *tsk, static int audit_compare_id(uid_t uid1,
const struct cred *cred, struct audit_names *name,
unsigned long name_offset,
struct audit_field *f, struct audit_field *f,
struct audit_context *ctx, struct audit_context *ctx)
struct audit_names *name)
{ {
struct audit_names *n; struct audit_names *n;
unsigned long addr;
uid_t uid2;
int rc;
switch (f->val) {
case AUDIT_COMPARE_UID_TO_OBJ_UID:
if (name) { if (name) {
return audit_comparator(cred->uid, f->op, name->uid); addr = (unsigned long)name;
} else if (ctx) { addr += name_offset;
uid2 = *(uid_t *)addr;
rc = audit_comparator(uid1, f->op, uid2);
if (rc)
return rc;
}
if (ctx) {
list_for_each_entry(n, &ctx->names_list, list) { list_for_each_entry(n, &ctx->names_list, list) {
if (audit_comparator(cred->uid, f->op, n->uid)) addr = (unsigned long)n;
return 1; addr += name_offset;
uid2 = *(uid_t *)addr;
rc = audit_comparator(uid1, f->op, uid2);
if (rc)
return rc;
} }
} }
break; return 0;
}
static int audit_field_compare(struct task_struct *tsk,
const struct cred *cred,
struct audit_field *f,
struct audit_context *ctx,
struct audit_names *name)
{
switch (f->val) {
case AUDIT_COMPARE_UID_TO_OBJ_UID:
return audit_compare_id(cred->uid,
name, offsetof(struct audit_names, uid),
f, ctx);
default: default:
WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n"); WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
return 0; return 0;
......
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