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authorSeth Forshee <seth.forshee@canonical.com>2014-07-03 01:29:19 +0400
committerMiklos Szeredi <mszeredi@redhat.com>2017-04-18 17:58:38 +0300
commit0b6e9ea041e6c932f5b3a86fae2d60cbcfad4dd2 (patch)
treecd3865a34605be80a272a920713b11df7efcb35b /fs/fuse/inode.c
parent095fc40ace5ffccd306f39fdd1a40b4faa41b8a0 (diff)
downloadlinux-0b6e9ea041e6c932f5b3a86fae2d60cbcfad4dd2.tar.xz
fuse: Add support for pid namespaces
When the userspace process servicing fuse requests is running in a pid namespace then pids passed via the fuse fd are not being translated into that process' namespace. Translation is necessary for the pid to be useful to that process. Since no use case currently exists for changing namespaces all translations can be done relative to the pid namespace in use when fuse_conn_init() is called. For fuse this translates to mount time, and for cuse this is when /dev/cuse is opened. IO for this connection from another namespace will return errors. Requests from processes whose pid cannot be translated into the target namespace will have a value of 0 for in.h.pid. File locking changes based on previous work done by Eric Biederman. Signed-off-by: Seth Forshee <seth.forshee@canonical.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse/inode.c')
-rw-r--r--fs/fuse/inode.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 3961c5f886be..a137f1c99a33 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -21,6 +21,7 @@
#include <linux/sched.h>
#include <linux/exportfs.h>
#include <linux/posix_acl.h>
+#include <linux/pid_namespace.h>
MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
MODULE_DESCRIPTION("Filesystem in Userspace");
@@ -626,6 +627,7 @@ void fuse_conn_init(struct fuse_conn *fc)
fc->connected = 1;
fc->attr_version = 1;
get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
+ fc->pid_ns = get_pid_ns(task_active_pid_ns(current));
}
EXPORT_SYMBOL_GPL(fuse_conn_init);
@@ -634,6 +636,7 @@ void fuse_conn_put(struct fuse_conn *fc)
if (refcount_dec_and_test(&fc->count)) {
if (fc->destroy_req)
fuse_request_free(fc->destroy_req);
+ put_pid_ns(fc->pid_ns);
fc->release(fc);
}
}