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| author | Eric W. Biederman <ebiederm@xmission.com> | 2013-01-30 18:50:54 -0800 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2013-02-13 06:00:52 -0800 |
| commit | 9fd973e085f7759f710603422b2e11ad5f2e000d (patch) | |
| tree | ab037487925db629c9e3c5b45475f0e97954fd1d | |
| parent | a0a5386ac6400493cc2eb8b58583e56af0708730 (diff) | |
| download | linux-9fd973e085f7759f710603422b2e11ad5f2e000d.tar.gz linux-9fd973e085f7759f710603422b2e11ad5f2e000d.tar.bz2 linux-9fd973e085f7759f710603422b2e11ad5f2e000d.zip | |
coda: Restrict coda messages to the initial pid namespace
Remove the slight chance that pids in coda messages will be
interpreted in the wrong pid namespace.
- Explicitly send all pids in coda messages in the initial pid
namespace.
- Only allow mounts from processes in the initial pid namespace.
- Only allow processes in the initial pid namespace to open the coda
character device to communicate with coda.
Cc: Jan Harkes <jaharkes@cs.cmu.edu>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
| -rw-r--r-- | fs/coda/inode.c | 4 | ||||
| -rw-r--r-- | fs/coda/psdev.c | 4 | ||||
| -rw-r--r-- | fs/coda/upcall.c | 4 |
3 files changed, 10 insertions, 2 deletions
diff --git a/fs/coda/inode.c b/fs/coda/inode.c index be2aa4909487..77bbaf4666a7 100644 --- a/fs/coda/inode.c +++ b/fs/coda/inode.c @@ -20,6 +20,7 @@ #include <linux/file.h> #include <linux/vfs.h> #include <linux/slab.h> +#include <linux/pid_namespace.h> #include <asm/uaccess.h> @@ -157,6 +158,9 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent) int error; int idx; + if (task_active_pid_ns(current) != &init_pid_ns) + return -EINVAL; + idx = get_device_index((struct coda_mount_data *) data); /* Ignore errors in data, for backward compatibility */ diff --git a/fs/coda/psdev.c b/fs/coda/psdev.c index 761d5b31b18d..dd60f905d4fe 100644 --- a/fs/coda/psdev.c +++ b/fs/coda/psdev.c @@ -37,6 +37,7 @@ #include <linux/list.h> #include <linux/mutex.h> #include <linux/device.h> +#include <linux/pid_namespace.h> #include <asm/io.h> #include <asm/poll.h> #include <asm/uaccess.h> @@ -266,6 +267,9 @@ static int coda_psdev_open(struct inode * inode, struct file * file) struct venus_comm *vcp; int idx, err; + if (task_active_pid_ns(current) != &init_pid_ns) + return -EINVAL; + idx = iminor(inode); if (idx < 0 || idx >= MAX_CODADEVS) return -ENODEV; diff --git a/fs/coda/upcall.c b/fs/coda/upcall.c index 0c68fd31fbf2..5c6d2cd6ee86 100644 --- a/fs/coda/upcall.c +++ b/fs/coda/upcall.c @@ -50,8 +50,8 @@ static void *alloc_upcall(int opcode, int size) return ERR_PTR(-ENOMEM); inp->ih.opcode = opcode; - inp->ih.pid = current->pid; - inp->ih.pgid = task_pgrp_nr(current); + inp->ih.pid = task_pid_nr_ns(current, &init_pid_ns); + inp->ih.pgid = task_pgrp_nr_ns(current, &init_pid_ns); inp->ih.uid = current_fsuid(); return (void*)inp; |