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proc: fix dentry/inode overinstantiating under /proc/${pid}/net

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[ Upstream commit 7055197705 ]

When a process exits, /proc/${pid}, and /proc/${pid}/net dentries are
flushed.  However some leaf dentries like /proc/${pid}/net/arp_cache
aren't.  That's because respective PDEs have proc_misc_d_revalidate() hook
which returns 1 and leaves dentries/inodes in the LRU.

Force revalidation/lookup on everything under /proc/${pid}/net by
inheriting proc_net_dentry_ops.

[akpm@linux-foundation.org: coding-style cleanups]
Link: https://lkml.kernel.org/r/YjdVHgildbWO7diJ@localhost.localdomain
Fixes: c6c75deda8 ("proc: fix lookup in /proc/net subdirectories after setns(2)")
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reported-by: hui li <juanfengpy@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexey Dobriyan 2022-05-09 18:29:19 -07:00 committed by Greg Kroah-Hartman
parent a2a605d6a3
commit dfeb241d2d
2 changed files with 6 additions and 0 deletions
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3
fs/proc/generic.c
View file

@ -448,6 +448,9 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
proc_set_user(ent, (*parent)->uid, (*parent)->gid);
ent->proc_dops = &proc_misc_dentry_ops;
/* Revalidate everything under /proc/${pid}/net */
if ((*parent)->proc_dops == &proc_net_dentry_ops)
pde_force_lookup(ent);
out:
return ent;

3
fs/proc/proc_net.c
View file

@ -376,6 +376,9 @@ static __net_init int proc_net_ns_init(struct net *net)
proc_set_user(netd, uid, gid);
/* Seed dentry revalidation for /proc/${pid}/net */
pde_force_lookup(netd);
err = -EEXIST;
net_statd = proc_net_mkdir(net, "stat", netd);
if (!net_statd)