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[PATCH] cleanup in proc_check_chroot()

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proc_check_chroot() does the check in a very unintuitive way (keeping a
copy of the argument, then modifying the argument), and has uncommented
sideeffects.

Signed-off-by: Herbert Poetzl <herbert@13thfloor.at>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Herbert Poetzl 2006-03-31 02:31:35 -08:00 committed by Linus Torvalds
parent 158d9ebd19
commit e4e5d3fc80
1 changed files with 8 additions and 5 deletions
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13
fs/proc/base.c
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@ -534,12 +534,15 @@ static int proc_oom_score(struct task_struct *task, char *buffer)
/* If the process being read is separated by chroot from the reading process, /* If the process being read is separated by chroot from the reading process,
* don't let the reader access the threads. * don't let the reader access the threads.
*
* note: this does dput(root) and mntput(vfsmnt) on exit.
*/ */
static int proc_check_chroot(struct dentry *root, struct vfsmount *vfsmnt) static int proc_check_chroot(struct dentry *root, struct vfsmount *vfsmnt)
{ {
struct dentry *de, *base; struct dentry *de, *base;
struct vfsmount *our_vfsmnt, *mnt; struct vfsmount *our_vfsmnt, *mnt;
int res = 0; int res = 0;
read_lock(&current->fs->lock); read_lock(&current->fs->lock);
our_vfsmnt = mntget(current->fs->rootmnt); our_vfsmnt = mntget(current->fs->rootmnt);
base = dget(current->fs->root); base = dget(current->fs->root);
@ -549,11 +552,11 @@ static int proc_check_chroot(struct dentry *root, struct vfsmount *vfsmnt)
de = root; de = root;
mnt = vfsmnt; mnt = vfsmnt;
while (vfsmnt != our_vfsmnt) { while (mnt != our_vfsmnt) {
if (vfsmnt == vfsmnt->mnt_parent) if (mnt == mnt->mnt_parent)
goto out; goto out;
de = vfsmnt->mnt_mountpoint; de = mnt->mnt_mountpoint;
vfsmnt = vfsmnt->mnt_parent; mnt = mnt->mnt_parent;
} }
if (!is_subdir(de, base)) if (!is_subdir(de, base))
@ -564,7 +567,7 @@ exit:
dput(base); dput(base);
mntput(our_vfsmnt); mntput(our_vfsmnt);
dput(root); dput(root);
mntput(mnt); mntput(vfsmnt);
return res; return res;
out: out:
spin_unlock(&vfsmount_lock); spin_unlock(&vfsmount_lock);