bpf: Add cookie object to bpf maps

JIRA: https://issues.redhat.com/browse/RHEL-78204

Conflicts: Context change due to missing commit 24507ce ("bpf:
ensure RCU Tasks Trace GP for sleepable raw tracepoint BPF links")

commit 12df58a
Author: Daniel Borkmann <[email protected]>
Date:   Thu Jul 31 01:47:30 2025 +0200

    bpf: Add cookie object to bpf maps

    Add a cookie to BPF maps to uniquely identify BPF maps for the timespan
    when the node is up. This is different to comparing a pointer or BPF map
    id which could get rolled over and reused.

    Signed-off-by: Daniel Borkmann <[email protected]>
    Link: https://lore.kernel.org/r/[email protected]
    Signed-off-by: Alexei Starovoitov <[email protected]>

Signed-off-by: Jerome Marchand <[email protected]>

Author: jeromemarchand

include/linux/bpf.h

@@ -310,6 +310,7 @@ struct bpf_map {
 	bool free_after_rcu_gp;
 	atomic64_t sleepable_refcnt;
 	s64 __percpu *elem_count;
+	u64 cookie; /* write-once */
 };
 
 static inline const char *btf_field_type_name(enum btf_field_type type)

kernel/bpf/syscall.c

@@ -37,6 +37,7 @@
 #include <linux/memcontrol.h>
 #include <linux/trace_events.h>
 #include <linux/overflow.h>
+#include <linux/cookie.h>
 
 #include <net/netfilter/nf_bpf_link.h>
 #include <net/netkit.h>
@@ -53,6 +54,7 @@
 #define BPF_OBJ_FLAG_MASK   (BPF_F_RDONLY | BPF_F_WRONLY)
 
 DEFINE_PER_CPU(int, bpf_prog_active);
+DEFINE_COOKIE(bpf_map_cookie);
 static DEFINE_IDR(prog_idr);
 static DEFINE_SPINLOCK(prog_idr_lock);
 static DEFINE_IDR(map_idr);
@@ -1504,6 +1506,10 @@ static int map_create(union bpf_attr *attr, bool kernel)
 	if (err < 0)
 		goto free_map;
 
+	preempt_disable();
+	map->cookie = gen_cookie_next(&bpf_map_cookie);
+	preempt_enable();
+
 	atomic64_set(&map->refcnt, 1);
 	atomic64_set(&map->usercnt, 1);
 	mutex_init(&map->freeze_mutex);