Messages in this thread Patch in this message |  | | Date | Sun, 20 Mar 2022 19:23:58 +0300 | From | Alexey Dobriyan <> | Subject | [PATCH] proc: fix dentry/inode overinstantiating under /proc/${pid}/net |
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When a process exits, /proc/${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/${pid}/net by inheriting proc_net_dentry_ops.
Fixes: c6c75deda813 ("proc: fix lookup in /proc/net subdirectories after setns(2)") Reported-by: hui li <juanfengpy@gmail.com> Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> ---
fs/proc/generic.c | 4 ++++ fs/proc/proc_net.c | 3 +++ 2 files changed, 7 insertions(+)
--- a/fs/proc/generic.c +++ b/fs/proc/generic.c @@ -448,6 +448,10 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent, proc_set_user(ent, (*parent)->uid, (*parent)->gid); ent->proc_dops = &proc_misc_dentry_ops; + /* Revalidate everything under /proc/${pid}/net */ + if ((*parent)->proc_dops == &proc_net_dentry_ops) { + pde_force_lookup(ent); + } out: return ent; --- a/fs/proc/proc_net.c +++ b/fs/proc/proc_net.c @@ -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)
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