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[v2,bpf-next,16/17] selftests/bpf: Check freeing sk->sk_local_storage with sk_local_storage->smap is NULL

Message ID 20230308065936.1550103-17-martin.lau@linux.dev (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series bpf: Use bpf_mem_cache_alloc/free in bpf_local_storage | expand

Checks

Context Check Description
netdev/series_format fail Series longer than 15 patches (and no cover letter)
netdev/tree_selection success Clearly marked for bpf-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 20 this patch: 20
netdev/cc_maintainers warning 11 maintainers not CCed: mykolal@fb.com song@kernel.org shuah@kernel.org sdf@google.com joannelkoong@gmail.com haoluo@google.com yhs@fb.com john.fastabend@gmail.com kpsingh@kernel.org jolsa@kernel.org linux-kselftest@vger.kernel.org
netdev/build_clang success Errors and warnings before: 18 this patch: 18
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 20 this patch: 20
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 52 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
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Commit Message

Martin KaFai Lau March 8, 2023, 6:59 a.m. UTC 
From: Martin KaFai Lau <martin.lau@kernel.org>

This patch tweats the socket_bind bpf prog to test the
local_storage->smap == NULL case in the bpf_local_storage_free()
code path. The idea is to create the local_storage with
the sk_storage_map's selem first. Then add the sk_storage_map2's selem
and then delete the earlier sk_storeage_map's selem.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
---
 .../selftests/bpf/progs/local_storage.c       | 29 +++++++++++++------
 1 file changed, 20 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/local_storage.c b/tools/testing/selftests/bpf/progs/local_storage.c
index 19423ed862e3..797c81655a47 100644
--- a/tools/testing/selftests/bpf/progs/local_storage.c
+++ b/tools/testing/selftests/bpf/progs/local_storage.c
@@ -109,18 +109,17 @@  int BPF_PROG(socket_bind, struct socket *sock, struct sockaddr *address,
 {
 	__u32 pid = bpf_get_current_pid_tgid() >> 32;
 	struct local_storage *storage;
-	int err;
 
 	if (pid != monitored_pid)
 		return 0;
 
-	storage = bpf_sk_storage_get(&sk_storage_map, sock->sk, 0,
-				     BPF_LOCAL_STORAGE_GET_F_CREATE);
+	storage = bpf_sk_storage_get(&sk_storage_map, sock->sk, 0, 0);
 	if (!storage)
 		return 0;
 
+	sk_storage_result = -1;
 	if (storage->value != DUMMY_STORAGE_VALUE)
-		sk_storage_result = -1;
+		return 0;
 
 	/* This tests that we can associate multiple elements
 	 * with the local storage.
@@ -130,14 +129,26 @@  int BPF_PROG(socket_bind, struct socket *sock, struct sockaddr *address,
 	if (!storage)
 		return 0;
 
-	err = bpf_sk_storage_delete(&sk_storage_map, sock->sk);
-	if (err)
+	if (bpf_sk_storage_delete(&sk_storage_map2, sock->sk))
 		return 0;
 
-	err = bpf_sk_storage_delete(&sk_storage_map2, sock->sk);
-	if (!err)
-		sk_storage_result = err;
+	storage = bpf_sk_storage_get(&sk_storage_map2, sock->sk, 0,
+				     BPF_LOCAL_STORAGE_GET_F_CREATE);
+	if (!storage)
+		return 0;
+
+	if (bpf_sk_storage_delete(&sk_storage_map, sock->sk))
+		return 0;
+
+	/* Ensure that the sk_storage_map is disconnected from the storage.
+	 * The storage memory should not be freed back to the
+	 * bpf_mem_alloc of the sk_bpf_storage_map because
+	 * sk_bpf_storage_map may have been gone.
+	 */
+	if (!sock->sk->sk_bpf_storage || sock->sk->sk_bpf_storage->smap)
+		return 0;
 
+	sk_storage_result = 0;
 	return 0;
 }