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authorEric W. Biederman <ebiederm@xmission.com>2008-02-08 04:18:34 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 09:22:24 -0800
commit488e5bc4560d0b510c1ddc451c51a6cc14e3a930 (patch)
tree0b0df343406ff47578280e01388fc997064c8aa9
parentdf5f8314ca30d6a76735748e5ba4ca9809c0f434 (diff)
proc: proper pidns handling for /proc/self
Currently if you access a /proc that is not mounted with your processes current pid namespace /proc/self will point at a completely random task. This patch fixes /proc/self to point to the current process if it is available in the particular mount of /proc or to return -ENOENT if the current process is not visible. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/proc/base.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 8a19a8a1a3e..75b1979749a 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2101,15 +2101,23 @@ static const struct file_operations proc_coredump_filter_operations = {
static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
int buflen)
{
+ struct pid_namespace *ns = dentry->d_sb->s_fs_info;
+ pid_t tgid = task_tgid_nr_ns(current, ns);
char tmp[PROC_NUMBUF];
- sprintf(tmp, "%d", task_tgid_vnr(current));
+ if (!tgid)
+ return -ENOENT;
+ sprintf(tmp, "%d", tgid);
return vfs_readlink(dentry,buffer,buflen,tmp);
}
static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
{
+ struct pid_namespace *ns = dentry->d_sb->s_fs_info;
+ pid_t tgid = task_tgid_nr_ns(current, ns);
char tmp[PROC_NUMBUF];
- sprintf(tmp, "%d", task_tgid_vnr(current));
+ if (!tgid)
+ return ERR_PTR(-ENOENT);
+ sprintf(tmp, "%d", task_tgid_nr_ns(current, ns));
return ERR_PTR(vfs_follow_link(nd,tmp));
}