Linux 3.8.10

Linux 3.8.10

[Greg KH]

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I'm announcing the release of the 3.8.10 kernel.

It fixes a build error in the 3.8.9 release.  If you can properly build
that kernel, no need for you to upgrade (hint, if you enable CONFIG_NS,
you need this release.)

Many thanks to Shea Levy for pointing out the problem.

The updated 3.8.y git tree can be found at:
	git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-3.8.y
and can be browsed at the normal kernel.org git web browser:
	http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary

thanks,

greg k-h

------------

 Makefile                   |    2 +-
 include/linux/capability.h |    2 ++
 kernel/capability.c        |   24 ++++++++++++++++++++++++
 3 files changed, 27 insertions(+), 1 deletion(-)

Greg Kroah-Hartman (1):
      Linux 3.8.10

Linus Torvalds (1):
      Add file_ns_capable() helper function for open-time capability checking


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Re: Linux 3.8.10

[Greg KH]

diff --git a/Makefile b/Makefile
index 3ae4796..e2b10b9 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 VERSION = 3
 PATCHLEVEL = 8
-SUBLEVEL = 9
+SUBLEVEL = 10
 EXTRAVERSION =
 NAME = Displaced Humerus Anterior
 
diff --git a/include/linux/capability.h b/include/linux/capability.h
index 98503b7..d9a4f7f4 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 493d972..f6c2ce5 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -393,6 +393,30 @@ bool ns_capable(struct user_namespace *ns, int cap)
 EXPORT_SYMBOL(ns_capable);
 
 /**
+ * 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;
+}
+EXPORT_SYMBOL(file_ns_capable);
+
+/**
  * capable - Determine if the current task has a superior capability in effect
  * @cap: The capability to be tested for
  *