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exec: binfmt_misc: don't nullify Node->dentry in kill_node() 

kill_node() nullifies/checks Node->dentry to avoid double free.  This
complicates the next changes and this is very confusing:

 - we do not need to check dentry != NULL under entries_lock,
   kill_node() is always called under inode_lock(d_inode(root)) and we
   rely on this inode_lock() anyway, without this lock the
   MISC_FMT_OPEN_FILE cleanup could race with itself.

 - if kill_inode() was already called and ->dentry == NULL we should not
   even try to close e->interp_file.

We can change bm_entry_write() to simply check !list_empty(list) before
kill_node.  Again, we rely on inode_lock(), in particular it saves us
from the race with bm_status_write(), another caller of kill_node().

Link: http://lkml.kernel.org/r/20170922143641.GA17210@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Ben Woodard <woodard@redhat.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jim Foraker <foraker1@llnl.gov>
Cc: <tdhooge@llnl.gov>
Cc: Travis Gummels <tgummels@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2017-10-03 16:15:45 -07:00 committed by Linus Torvalds
parent c2315c187f
commit baba1b2973
1 changed files with 9 additions and 13 deletions
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10
fs/binfmt_misc.c
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@ -603,11 +603,7 @@ static void kill_node(Node *e)
struct dentry *dentry;
write_lock(&entries_lock);
dentry = e->dentry;
if (dentry) {
list_del_init(&e->list);
e->dentry = NULL;
}
write_unlock(&entries_lock);
if ((e->flags & MISC_FMT_OPEN_FILE) && e->interp_file) {
@ -615,12 +611,11 @@ static void kill_node(Node *e)
e->interp_file = NULL;
}
if (dentry) {
dentry = e->dentry;
drop_nlink(d_inode(dentry));
d_drop(dentry);
dput(dentry);
simple_release_fs(&bm_mnt, &entry_count);
}
}
/* /<entry> */
@ -665,6 +660,7 @@ static ssize_t bm_entry_write(struct file *file, const char __user *buffer,
root = file_inode(file)->i_sb->s_root;
inode_lock(d_inode(root));
if (!list_empty(&e->list))
kill_node(e);
inode_unlock(d_inode(root));
@ -794,7 +790,7 @@ static ssize_t bm_status_write(struct file *file, const char __user *buffer,
inode_lock(d_inode(root));
while (!list_empty(&entries))
kill_node(list_entry(entries.next, Node, list));
kill_node(list_first_entry(&entries, Node, list));
inode_unlock(d_inode(root));
break;