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authorLinus Torvalds <torvalds@linux-foundation.org>2013-04-14 10:06:31 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-26 12:18:20 -0700
commit97129f70b9a32ddf8929daacd2abee36a7f0ddad (patch)
parent8299a17a0544a45529a954cf27f9bf40e8890ac6 (diff)
Add file_ns_capable() helper function for open-time capability checking
commit 935d8aabd4331f47a89c3e1daa5779d23cf244ee upstream. Nothing is using it yet, but this will allow us to delay the open-time checks to use time, without breaking the normal UNIX permission semantics where permissions are determined by the opener (and the file descriptor can then be passed to a different process, or the process can drop capabilities). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Shea Levy <shea@shealevy.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/capability.h b/include/linux/capability.h
index 98503b792369..d9a4f7f40f32 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -35,6 +35,7 @@ struct cpu_vfs_cap_data {
#define _KERNEL_CAP_T_SIZE (sizeof(kernel_cap_t))
+struct file;
struct inode;
struct dentry;
struct user_namespace;
@@ -211,6 +212,7 @@ extern bool capable(int cap);
extern bool ns_capable(struct user_namespace *ns, int cap);
extern bool nsown_capable(int cap);
extern bool inode_capable(const struct inode *inode, int cap);
+extern bool file_ns_capable(const struct file *file, struct user_namespace *ns, int cap);
/* audit system wants to get cap info from files as well */
extern int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data *cpu_caps);
diff --git a/kernel/capability.c b/kernel/capability.c
index 493d97259484..f6c2ce5701e1 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -393,6 +393,30 @@ bool ns_capable(struct user_namespace *ns, int cap)
+ * file_ns_capable - Determine if the file's opener had a capability in effect
+ * @file: The file we want to check
+ * @ns: The usernamespace we want the capability in
+ * @cap: The capability to be tested for
+ *
+ * Return true if task that opened the file had a capability in effect
+ * when the file was opened.
+ *
+ * This does not set PF_SUPERPRIV because the caller may not
+ * actually be privileged.
+ */
+bool file_ns_capable(const struct file *file, struct user_namespace *ns, int cap)
+ if (WARN_ON_ONCE(!cap_valid(cap)))
+ return false;
+ if (security_capable(file->f_cred, ns, cap) == 0)
+ return true;
+ return false;
* capable - Determine if the current task has a superior capability in effect
* @cap: The capability to be tested for