6.6-stable review patch. If anyone has any objections, please let me know.
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From: Kuniyuki Iwashima kuniyu@amazon.com
commit 29b64e354029cfcf1eea4d91b146c7b769305930 upstream.
As with the previous patch, we preallocate to skb's scm_fp_list an array of struct unix_edge in the number of inflight AF_UNIX fds.
There we just preallocate memory and do not use immediately because sendmsg() could fail after this point. The actual use will be in the next patch.
When we queue skb with inflight edges, we will set the inflight socket's unix_sock as unix_edge->predecessor and the receiver's unix_sock as successor, and then we will link the edge to the inflight socket's unix_vertex.edges.
Note that we set NULL to cloned scm_fp_list.edges in scm_fp_dup() so that MSG_PEEK does not change the shape of the directed graph.
Signed-off-by: Kuniyuki Iwashima kuniyu@amazon.com Acked-by: Paolo Abeni pabeni@redhat.com Link: https://lore.kernel.org/r/20240325202425.60930-3-kuniyu@amazon.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Lee Jones lee@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/af_unix.h | 6 ++++++ include/net/scm.h | 5 +++++ net/core/scm.c | 2 ++ net/unix/garbage.c | 6 ++++++ 4 files changed, 19 insertions(+)
--- a/include/net/af_unix.h +++ b/include/net/af_unix.h @@ -33,6 +33,12 @@ struct unix_vertex { unsigned long out_degree; };
+struct unix_edge { + struct unix_sock *predecessor; + struct unix_sock *successor; + struct list_head vertex_entry; +}; + struct sock *unix_peer_get(struct sock *sk);
#define UNIX_HASH_MOD (256 - 1) --- a/include/net/scm.h +++ b/include/net/scm.h @@ -22,12 +22,17 @@ struct scm_creds { kgid_t gid; };
+#ifdef CONFIG_UNIX +struct unix_edge; +#endif + struct scm_fp_list { short count; short count_unix; short max; #ifdef CONFIG_UNIX struct list_head vertices; + struct unix_edge *edges; #endif struct user_struct *user; struct file *fp[SCM_MAX_FD]; --- a/net/core/scm.c +++ b/net/core/scm.c @@ -90,6 +90,7 @@ static int scm_fp_copy(struct cmsghdr *c fpl->max = SCM_MAX_FD; fpl->user = NULL; #if IS_ENABLED(CONFIG_UNIX) + fpl->edges = NULL; INIT_LIST_HEAD(&fpl->vertices); #endif } @@ -383,6 +384,7 @@ struct scm_fp_list *scm_fp_dup(struct sc new_fpl->max = new_fpl->count; new_fpl->user = get_uid(fpl->user); #if IS_ENABLED(CONFIG_UNIX) + new_fpl->edges = NULL; INIT_LIST_HEAD(&new_fpl->vertices); #endif } --- a/net/unix/garbage.c +++ b/net/unix/garbage.c @@ -127,6 +127,11 @@ int unix_prepare_fpl(struct scm_fp_list list_add(&vertex->entry, &fpl->vertices); }
+ fpl->edges = kvmalloc_array(fpl->count_unix, sizeof(*fpl->edges), + GFP_KERNEL_ACCOUNT); + if (!fpl->edges) + goto err; + return 0;
err: @@ -136,6 +141,7 @@ err:
void unix_destroy_fpl(struct scm_fp_list *fpl) { + kvfree(fpl->edges); unix_free_vertices(fpl); }