mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 12:30:53 +07:00
415e3d3e90
The commit referenced in the Fixes tag incorrectly accounted the number
of in-flight fds over a unix domain socket to the original opener
of the file-descriptor. This allows another process to arbitrary
deplete the original file-openers resource limit for the maximum of
open files. Instead the sending processes and its struct cred should
be credited.
To do so, we add a reference counted struct user_struct pointer to the
scm_fp_list and use it to account for the number of inflight unix fds.
Fixes: 712f4aad40 ("unix: properly account for FDs passed over unix sockets")
Reported-by: David Herrmann <dh.herrmann@gmail.com>
Cc: David Herrmann <dh.herrmann@gmail.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
#ifndef __LINUX_NET_AFUNIX_H
|
|
#define __LINUX_NET_AFUNIX_H
|
|
|
|
#include <linux/socket.h>
|
|
#include <linux/un.h>
|
|
#include <linux/mutex.h>
|
|
#include <net/sock.h>
|
|
|
|
void unix_inflight(struct user_struct *user, struct file *fp);
|
|
void unix_notinflight(struct user_struct *user, struct file *fp);
|
|
void unix_gc(void);
|
|
void wait_for_unix_gc(void);
|
|
struct sock *unix_get_socket(struct file *filp);
|
|
struct sock *unix_peer_get(struct sock *);
|
|
|
|
#define UNIX_HASH_SIZE 256
|
|
#define UNIX_HASH_BITS 8
|
|
|
|
extern unsigned int unix_tot_inflight;
|
|
extern spinlock_t unix_table_lock;
|
|
extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
|
|
|
|
struct unix_address {
|
|
atomic_t refcnt;
|
|
int len;
|
|
unsigned int hash;
|
|
struct sockaddr_un name[0];
|
|
};
|
|
|
|
struct unix_skb_parms {
|
|
struct pid *pid; /* Skb credentials */
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
struct scm_fp_list *fp; /* Passed files */
|
|
#ifdef CONFIG_SECURITY_NETWORK
|
|
u32 secid; /* Security ID */
|
|
#endif
|
|
u32 consumed;
|
|
};
|
|
|
|
#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
|
|
|
|
#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
|
|
#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
|
|
#define unix_state_lock_nested(s) \
|
|
spin_lock_nested(&unix_sk(s)->lock, \
|
|
SINGLE_DEPTH_NESTING)
|
|
|
|
/* The AF_UNIX socket */
|
|
struct unix_sock {
|
|
/* WARNING: sk has to be the first member */
|
|
struct sock sk;
|
|
struct unix_address *addr;
|
|
struct path path;
|
|
struct mutex readlock;
|
|
struct sock *peer;
|
|
struct list_head link;
|
|
atomic_long_t inflight;
|
|
spinlock_t lock;
|
|
unsigned char recursion_level;
|
|
unsigned long gc_flags;
|
|
#define UNIX_GC_CANDIDATE 0
|
|
#define UNIX_GC_MAYBE_CYCLE 1
|
|
struct socket_wq peer_wq;
|
|
wait_queue_t peer_wake;
|
|
};
|
|
|
|
static inline struct unix_sock *unix_sk(const struct sock *sk)
|
|
{
|
|
return (struct unix_sock *)sk;
|
|
}
|
|
|
|
#define peer_wait peer_wq.wait
|
|
|
|
long unix_inq_len(struct sock *sk);
|
|
long unix_outq_len(struct sock *sk);
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
int unix_sysctl_register(struct net *net);
|
|
void unix_sysctl_unregister(struct net *net);
|
|
#else
|
|
static inline int unix_sysctl_register(struct net *net) { return 0; }
|
|
static inline void unix_sysctl_unregister(struct net *net) {}
|
|
#endif
|
|
#endif
|