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| author | Eric W. Biederman <ebiederm@xmission.com> | 2008-02-08 04:18:34 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-08 09:22:24 -0800 |
| commit | 488e5bc4560d0b510c1ddc451c51a6cc14e3a930 (patch) | |
| tree | 0b0df343406ff47578280e01388fc997064c8aa9 /fs | |
| parent | df5f8314ca30d6a76735748e5ba4ca9809c0f434 (diff) | |
| download | linux-488e5bc4560d0b510c1ddc451c51a6cc14e3a930.tar.bz2 | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/proc/base.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 8a19a8a1a3e6..75b1979749a5 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)); } |