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-rw-r--r--include/linux/selinux.h34
-rw-r--r--kernel/auditsc.c53
-rw-r--r--security/selinux/exports.c24
3 files changed, 74 insertions, 37 deletions
diff --git a/include/linux/selinux.h b/include/linux/selinux.h
index 9d684b1728b0..84a6c7404687 100644
--- a/include/linux/selinux.h
+++ b/include/linux/selinux.h
@@ -15,6 +15,7 @@
struct selinux_audit_rule;
struct audit_context;
+struct inode;
#ifdef CONFIG_SECURITY_SELINUX
@@ -76,6 +77,27 @@ void selinux_audit_set_callback(int (*callback)(void));
*/
void selinux_task_ctxid(struct task_struct *tsk, u32 *ctxid);
+/**
+ * selinux_ctxid_to_string - map a security context ID to a string
+ * @ctxid: security context ID to be converted.
+ * @ctx: address of context string to be returned
+ * @ctxlen: length of returned context string.
+ *
+ * Returns 0 if successful, -errno if not. On success, the context
+ * string will be allocated internally, and the caller must call
+ * kfree() on it after use.
+ */
+int selinux_ctxid_to_string(u32 ctxid, char **ctx, u32 *ctxlen);
+
+/**
+ * selinux_get_inode_sid - get the inode's security context ID
+ * @inode: inode structure to get the sid from.
+ * @sid: pointer to security context ID to be filled in.
+ *
+ * Returns nothing
+ */
+void selinux_get_inode_sid(const struct inode *inode, u32 *sid);
+
#else
static inline int selinux_audit_rule_init(u32 field, u32 op,
@@ -107,6 +129,18 @@ static inline void selinux_task_ctxid(struct task_struct *tsk, u32 *ctxid)
*ctxid = 0;
}
+static inline int selinux_ctxid_to_string(u32 ctxid, char **ctx, u32 *ctxlen)
+{
+ *ctx = NULL;
+ *ctxlen = 0;
+ return 0;
+}
+
+static inline void selinux_get_inode_sid(const struct inode *inode, u32 *sid)
+{
+ *sid = 0;
+}
+
#endif /* CONFIG_SECURITY_SELINUX */
#endif /* _LINUX_SELINUX_H */
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index d3d97d28b69a..2e123a8a0d60 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -90,7 +90,7 @@ struct audit_names {
uid_t uid;
gid_t gid;
dev_t rdev;
- char *ctx;
+ u32 osid;
};
struct audit_aux_data {
@@ -410,9 +410,6 @@ static inline void audit_free_names(struct audit_context *context)
#endif
for (i = 0; i < context->name_count; i++) {
- char *p = context->names[i].ctx;
- context->names[i].ctx = NULL;
- kfree(p);
if (context->names[i].name)
__putname(context->names[i].name);
}
@@ -674,6 +671,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
}
}
for (i = 0; i < context->name_count; i++) {
+ int call_panic = 0;
unsigned long ino = context->names[i].ino;
unsigned long pino = context->names[i].pino;
@@ -703,12 +701,22 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
context->names[i].gid,
MAJOR(context->names[i].rdev),
MINOR(context->names[i].rdev));
- if (context->names[i].ctx) {
- audit_log_format(ab, " obj=%s",
- context->names[i].ctx);
+ if (context->names[i].osid != 0) {
+ char *ctx = NULL;
+ u32 len;
+ if (selinux_ctxid_to_string(
+ context->names[i].osid, &ctx, &len)) {
+ audit_log_format(ab, " obj=%u",
+ context->names[i].osid);
+ call_panic = 1;
+ } else
+ audit_log_format(ab, " obj=%s", ctx);
+ kfree(ctx);
}
audit_log_end(ab);
+ if (call_panic)
+ audit_panic("error converting sid to string");
}
}
@@ -946,37 +954,8 @@ void audit_putname(const char *name)
void audit_inode_context(int idx, const struct inode *inode)
{
struct audit_context *context = current->audit_context;
- const char *suffix = security_inode_xattr_getsuffix();
- char *ctx = NULL;
- int len = 0;
-
- if (!suffix)
- goto ret;
-
- len = security_inode_getsecurity(inode, suffix, NULL, 0, 0);
- if (len == -EOPNOTSUPP)
- goto ret;
- if (len < 0)
- goto error_path;
-
- ctx = kmalloc(len, GFP_KERNEL);
- if (!ctx)
- goto error_path;
-
- len = security_inode_getsecurity(inode, suffix, ctx, len, 0);
- if (len < 0)
- goto error_path;
-
- kfree(context->names[idx].ctx);
- context->names[idx].ctx = ctx;
- goto ret;
-error_path:
- if (ctx)
- kfree(ctx);
- audit_panic("error in audit_inode_context");
-ret:
- return;
+ selinux_get_inode_sid(inode, &context->names[idx].osid);
}
diff --git a/security/selinux/exports.c b/security/selinux/exports.c
index 333c4c7824d8..07ddce7bf374 100644
--- a/security/selinux/exports.c
+++ b/security/selinux/exports.c
@@ -14,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/selinux.h>
+#include <linux/fs.h>
#include "security.h"
#include "objsec.h"
@@ -26,3 +27,26 @@ void selinux_task_ctxid(struct task_struct *tsk, u32 *ctxid)
else
*ctxid = 0;
}
+
+int selinux_ctxid_to_string(u32 ctxid, char **ctx, u32 *ctxlen)
+{
+ if (selinux_enabled)
+ return security_sid_to_context(ctxid, ctx, ctxlen);
+ else {
+ *ctx = NULL;
+ *ctxlen = 0;
+ }
+
+ return 0;
+}
+
+void selinux_get_inode_sid(const struct inode *inode, u32 *sid)
+{
+ if (selinux_enabled) {
+ struct inode_security_struct *isec = inode->i_security;
+ *sid = isec->sid;
+ return;
+ }
+ *sid = 0;
+}
+