Re: [PATCH v6 0/3] KEYS: Replace assoc_array with rhashtable

[Jarkko Sakkinen <jarkko@kernel.org>]

On Sat, Nov 07, 2026 at 09:56:01PM +0200, Jarkko Sakkinen wrote:
> The keyrings subsystem is the sole user of assoc_array. It has over 1700
> lines of code, no test suite, and a long history of bugs, with LLMs now
> finding more.
> 
> This unfortunate outcome has evolved over time by large from the shortage
> of in-kernel callers, time bandwidth and 3rd party contributors.
> 
> What the keyrings subsystem needs is just a generic key-value store, which
> performs well with sparse key sets. Replace assoc_array with an
> rhashtable-backed keyring index and remove assoc_array from the kernel.

Sashiko: https://sashiko.dev/#/patchset/20261107195605.3929659-1-jarkko%40kernel.org

Not addressing this as only one patch changed and the change was
exactly:

diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index 772fa0e35f9d..6761c6801edc 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -12,7 +12,6 @@
 #include <linux/security.h>
 #include <linux/seq_file.h>
 #include <linux/err.h>
-#include <linux/delay.h>
 #include <linux/jhash.h>
 #include <linux/user_namespace.h>
 #include <linux/nsproxy.h>
@@ -101,6 +100,7 @@ static const struct rhashtable_params keyring_link_params = {
        .min_size               = 4,
        .nelem_hint             = 3,
        .automatic_shrinking    = true,
+       .insecure_elasticity    = true,
 };

 static struct keyring_index *keyring_index_locked(const struct key *keyring)
@@ -1225,12 +1225,8 @@ int __key_link_begin(struct key *keyring,
                if (ret < 0)
                        goto error;

-               do {
-                       ret = rhashtable_insert_fast(&links->ht, &link->node,
-                                                    keyring_link_params);
-                       if (ret == -EBUSY)
-                               fsleep(100);
-               } while (ret == -EBUSY);
+               ret = rhashtable_insert_fast(&links->ht, &link->node,
+                                            keyring_link_params);
                if (ret < 0) {
                        key_payload_reserve(keyring,
                                            keyring->datalen - KEYQUOTA_LINK_BYTES);

So I don't think there are any real issue with the patch set, except I
will need to rebase the commits to the latest mainline.

Br, Jarkko