Re: [PATCH v3] bpf: Replace bpf_lpm_trie_key 0-length array with flexible array

On 2/20/24 12:41 AM, Kees Cook wrote:

Replace deprecated 0-length array in struct bpf_lpm_trie_key with flexible array. Found with GCC 13:

../kernel/bpf/lpm_trie.c:207:51: warning: array subscript i is outside array bounds of 'const __u8[0]' {aka 'const unsigned char[]'} [-Warray-bounds=] 207 | *(__be16 *)&key->data[i]); | ^~~~~~~~~~~~~ ../include/uapi/linux/swab.h:102:54: note: in definition of macro '__swab16' 102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) | ^ ../include/linux/byteorder/generic.h:97:21: note: in expansion of macro '__be16_to_cpu' 97 | #define be16_to_cpu __be16_to_cpu | ^~~~~~~~~~~~~ ../kernel/bpf/lpm_trie.c:206:28: note: in expansion of macro 'be16_to_cpu' 206 | u16 diff = be16_to_cpu(*(__be16 *)&node->data[i] ^ | ^~~~~~~~~~~ In file included from ../include/linux/bpf.h:7: ../include/uapi/linux/bpf.h:82:17: note: while referencing 'data' 82 | __u8 data[0]; /* Arbitrary size */ | ^~~~

And found at run-time under CONFIG_FORTIFY_SOURCE:

UBSAN: array-index-out-of-bounds in kernel/bpf/lpm_trie.c:218:49 index 0 is out of range for type '__u8 [*]'

Changing struct bpf_lpm_trie_key is difficult since has been used by userspace. For example, in Cilium:

struct egress_gw_policy_key { struct bpf_lpm_trie_key lpm_key; __u32 saddr; __u32 daddr; };

While direct references to the "data" member haven't been found, there are static initializers what include the final member. For example, the "{}" here:

     struct egress_gw_policy_key in_key = {
             .lpm_key = { 32 + 24, {} },
             .saddr   = CLIENT_IP,
             .daddr   = EXTERNAL_SVC_IP & 0Xffffff,
     };

To avoid the build time and run time warnings seen with a 0-sized trailing array for struct bpf_lpm_trie_key, introduce a new struct that correctly uses a flexible array for the trailing bytes, struct bpf_lpm_trie_key_u8. As part of this, include the "header" portion (which is just the "prefixlen" member), so it can be used by anything building a bpf_lpr_trie_key that has trailing members that aren't a u8 flexible array (like the self-test[1]), which is named struct bpf_lpm_trie_key_hdr.

Adjust the kernel code to use struct bpf_lpm_trie_key_u8 through-out, and for the selftest to use struct bpf_lpm_trie_key_hdr. Add a comment to the UAPI header directing folks to the two new options.

Link: https://lore.kernel.org/all/202206281009.4332AA33@keescook/ [1] Reported-by: Mark Rutland mark.rutland@arm.com Closes: https://paste.debian.net/hidden/ca500597/ Signed-off-by: Kees Cook keescook@chromium.org

---

v3- create a new pair of structs -- leave old struct alone v2- https://lore.kernel.org/lkml/20240216235536.it.234-kees@kernel.org/ v1- https://lore.kernel.org/lkml/20230204183241.never.481-kees@kernel.org/ Cc: Daniel Borkmann daniel@iogearbox.net Cc: Alexei Starovoitov ast@kernel.org Cc: Andrii Nakryiko andrii@kernel.org Cc: Martin KaFai Lau martin.lau@linux.dev Cc: Song Liu song@kernel.org Cc: Yonghong Song yhs@fb.com Cc: John Fastabend john.fastabend@gmail.com Cc: KP Singh kpsingh@kernel.org Cc: Stanislav Fomichev sdf@google.com Cc: Hao Luo haoluo@google.com Cc: Jiri Olsa jolsa@kernel.org Cc: Mykola Lysenko mykolal@fb.com Cc: Shuah Khan shuah@kernel.org Cc: Haowen Bai baihaowen@meizu.com Cc: bpf@vger.kernel.org Cc: linux-kselftest@vger.kernel.org

---

Documentation/bpf/map_lpm_trie.rst | 2 +- include/uapi/linux/bpf.h | 14 ++++++++++++- kernel/bpf/lpm_trie.c | 20 +++++++++---------- samples/bpf/map_perf_test_user.c | 2 +- samples/bpf/xdp_router_ipv4_user.c | 2 +- tools/include/uapi/linux/bpf.h | 14 ++++++++++++- .../selftests/bpf/progs/map_ptr_kern.c | 2 +- tools/testing/selftests/bpf/test_lpm_map.c | 18 ++++++++--------- 8 files changed, 49 insertions(+), 25 deletions(-)

diff --git a/Documentation/bpf/map_lpm_trie.rst b/Documentation/bpf/map_lpm_trie.rst index 74d64a30f500..f9cd579496c9 100644 --- a/Documentation/bpf/map_lpm_trie.rst +++ b/Documentation/bpf/map_lpm_trie.rst @@ -17,7 +17,7 @@ significant byte. LPM tries may be created with a maximum prefix length that is a multiple of 8, in the range from 8 to 2048. The key used for lookup and update -operations is a ``struct bpf_lpm_trie_key``, extended by +operations is a ``struct bpf_lpm_trie_key_u8``, extended by ``max_prefixlen/8`` bytes.

• For IPv4 addresses the data length is 4 bytes

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 754e68ca8744..c5a46d12076e 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -77,12 +77,24 @@ struct bpf_insn { __s32 imm; /* signed immediate constant */ }; -/* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */ +/* Deprecated: use struct bpf_lpm_trie_key_u8 (when the "data" member is needed for

• • byte access) or struct bpf_lpm_trie_key_hdr (when using an alternative type for
• • the trailing flexible array member) instead.
• */ struct bpf_lpm_trie_key { __u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */ __u8 data[0]; /* Arbitrary size */ };

+/* Key of an a BPF_MAP_TYPE_LPM_TRIE entry, with trailing byte array. */ +struct bpf_lpm_trie_key_u8 {

• __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */,

• /* up to 32 for AF_INET, 128 for AF_INET6 */
  

• __u32	prefixlen;
  

• );
• __u8 data[]; /* Arbitrary size */

+};

• struct bpf_cgroup_storage_key { __u64 cgroup_inode_id; /* cgroup inode id */ __u32 attach_type; /* program attach type (enum bpf_attach_type) */

diff --git a/kernel/bpf/lpm_trie.c b/kernel/bpf/lpm_trie.c index b32be680da6c..050fe1ebf0f7 100644 --- a/kernel/bpf/lpm_trie.c +++ b/kernel/bpf/lpm_trie.c @@ -164,13 +164,13 @@ static inline int extract_bit(const u8 *data, size_t index) */ static size_t longest_prefix_match(const struct lpm_trie *trie, const struct lpm_trie_node *node,

• 		   const struct bpf_lpm_trie_key *key)
  

• 		   const struct bpf_lpm_trie_key_u8 *key)
  

  { u32 limit = min(node->prefixlen, key->prefixlen); u32 prefixlen = 0, i = 0;

BUILD_BUG_ON(offsetof(struct lpm_trie_node, data) % sizeof(u32));

• BUILD_BUG_ON(offsetof(struct bpf_lpm_trie_key, data) % sizeof(u32));

• BUILD_BUG_ON(offsetof(struct bpf_lpm_trie_key_u8, data) % sizeof(u32));

#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && defined(CONFIG_64BIT) @@ -229,7 +229,7 @@ static void *trie_lookup_elem(struct bpf_map *map, void *_key) { struct lpm_trie *trie = container_of(map, struct lpm_trie, map); struct lpm_trie_node *node, *found = NULL;

• struct bpf_lpm_trie_key *key = _key;

• struct bpf_lpm_trie_key_u8 *key = _key;

if (key->prefixlen > trie->max_prefixlen) return NULL; @@ -309,7 +309,7 @@ static long trie_update_elem(struct bpf_map *map, struct lpm_trie *trie = container_of(map, struct lpm_trie, map); struct lpm_trie_node *node, *im_node = NULL, *new_node = NULL; struct lpm_trie_node __rcu **slot;

• struct bpf_lpm_trie_key *key = _key;

• struct bpf_lpm_trie_key_u8 *key = _key; unsigned long irq_flags; unsigned int next_bit; size_t matchlen = 0;

@@ -437,7 +437,7 @@ static long trie_update_elem(struct bpf_map *map, static long trie_delete_elem(struct bpf_map *map, void *_key) { struct lpm_trie *trie = container_of(map, struct lpm_trie, map);

• struct bpf_lpm_trie_key *key = _key;

• struct bpf_lpm_trie_key_u8 *key = _key; struct lpm_trie_node __rcu **trim, **trim2; struct lpm_trie_node *node, *parent; unsigned long irq_flags;

@@ -536,7 +536,7 @@ static long trie_delete_elem(struct bpf_map *map, void *_key) sizeof(struct lpm_trie_node)) #define LPM_VAL_SIZE_MIN 1 -#define LPM_KEY_SIZE(X) (sizeof(struct bpf_lpm_trie_key) + (X)) +#define LPM_KEY_SIZE(X) (sizeof(struct bpf_lpm_trie_key_u8) + (X)) #define LPM_KEY_SIZE_MAX LPM_KEY_SIZE(LPM_DATA_SIZE_MAX) #define LPM_KEY_SIZE_MIN LPM_KEY_SIZE(LPM_DATA_SIZE_MIN) @@ -565,7 +565,7 @@ static struct bpf_map *trie_alloc(union bpf_attr *attr) /* copy mandatory map attributes */ bpf_map_init_from_attr(&trie->map, attr); trie->data_size = attr->key_size -

• 	  offsetof(struct bpf_lpm_trie_key, data);
  

• 	  offsetof(struct bpf_lpm_trie_key_u8, data);
  

  trie->max_prefixlen = trie->data_size * 8;

spin_lock_init(&trie->lock); @@ -616,7 +616,7 @@ static int trie_get_next_key(struct bpf_map *map, void *_key, void *_next_key) { struct lpm_trie_node *node, *next_node = NULL, *parent, *search_root; struct lpm_trie *trie = container_of(map, struct lpm_trie, map);

• struct bpf_lpm_trie_key *key = _key, *next_key = _next_key;

• struct bpf_lpm_trie_key_u8 *key = _key, *next_key = _next_key; struct lpm_trie_node **node_stack = NULL; int err = 0, stack_ptr = -1; unsigned int next_bit;

@@ -703,7 +703,7 @@ static int trie_get_next_key(struct bpf_map *map, void *_key, void *_next_key) } do_copy: next_key->prefixlen = next_node->prefixlen;

• memcpy((void *)next_key + offsetof(struct bpf_lpm_trie_key, data),

• memcpy((void *)next_key + offsetof(struct bpf_lpm_trie_key_u8, data), next_node->data, trie->data_size); free_stack: kfree(node_stack);

@@ -715,7 +715,7 @@ static int trie_check_btf(const struct bpf_map *map, const struct btf_type *key_type, const struct btf_type *value_type) {

• /* Keys must have struct bpf_lpm_trie_key embedded. */

• /* Keys must have struct bpf_lpm_trie_key_u8 embedded. */ return BTF_INFO_KIND(key_type->info) != BTF_KIND_STRUCT ? -EINVAL : 0; }

diff --git a/samples/bpf/map_perf_test_user.c b/samples/bpf/map_perf_test_user.c index d2fbcf963cdf..07ff471ed6ae 100644 --- a/samples/bpf/map_perf_test_user.c +++ b/samples/bpf/map_perf_test_user.c @@ -370,7 +370,7 @@ static void run_perf_test(int tasks) static void fill_lpm_trie(void) {

• struct bpf_lpm_trie_key *key;

• struct bpf_lpm_trie_key_u8 *key; unsigned long value = 0; unsigned int i; int r;

diff --git a/samples/bpf/xdp_router_ipv4_user.c b/samples/bpf/xdp_router_ipv4_user.c index 9d41db09c480..266fdd0b025d 100644 --- a/samples/bpf/xdp_router_ipv4_user.c +++ b/samples/bpf/xdp_router_ipv4_user.c @@ -91,7 +91,7 @@ static int recv_msg(struct sockaddr_nl sock_addr, int sock) static void read_route(struct nlmsghdr *nh, int nll) { char dsts[24], gws[24], ifs[16], dsts_len[24], metrics[24];

• struct bpf_lpm_trie_key *prefix_key;

• struct bpf_lpm_trie_key_u8 *prefix_key; struct rtattr *rt_attr; struct rtmsg *rt_msg; int rtm_family;

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 7f24d898efbb..c55244bf1a20 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -77,12 +77,24 @@ struct bpf_insn { __s32 imm; /* signed immediate constant */ }; -/* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */ +/* Deprecated: use struct bpf_lpm_trie_key_u8 (when the "data" member is needed for

• • byte access) or struct bpf_lpm_trie_key_hdr (when using an alternative type for
• • the trailing flexible array member) instead.
• */ struct bpf_lpm_trie_key { __u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */ __u8 data[0]; /* Arbitrary size */ };

+/* Key of an a BPF_MAP_TYPE_LPM_TRIE entry, with trailing byte array. */ +struct bpf_lpm_trie_key_u8 {

• __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */,

• /* up to 32 for AF_INET, 128 for AF_INET6 */
  

• __u32	prefixlen;
  

• );
• __u8 data[]; /* Arbitrary size */

+};

• struct bpf_cgroup_storage_key { __u64 cgroup_inode_id; /* cgroup inode id */ __u32 attach_type; /* program attach type (enum bpf_attach_type) */

This fails the BPF CI :

[...] INSTALL /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/include/bpf/skel_internal.h INSTALL /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/include/bpf/libbpf_version.h INSTALL /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/include/bpf/usdt.bpf.h In file included from urandom_read_lib1.c:7: In file included from /tmp/work/bpf/bpf/tools/lib/bpf/libbpf_internal.h:20: In file included from /tmp/work/bpf/bpf/tools/lib/bpf/relo_core.h:7: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: type name requires a specifier or qualifier 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^ /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:58: error: expected identifier 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^ /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:93:18: error: unexpected ';' before ')' 93 | __u32 prefixlen; | ^ /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:95:7: error: flexible array member 'data' not allowed in otherwise empty struct 95 | __u8 data[]; /* Arbitrary size */ | ^ HOSTCC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/fixdep.o 4 errors generated. GEN /tmp/work/bpf/bpf/tools/testing/selftests/bpf/bpf-syscall.2 HOSTLD /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/fixdep-in.o LINK /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/fixdep make: *** [Makefile:230: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/liburandom_read.so] Error 1 make: *** Waiting for unfinished jobs.... INSTALL /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/include/bpf/bpf_helper_defs.h INSTALL libbpf_headers GEN /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.pc MKDIR /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/ MKDIR /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/ MKDIR /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/ MKDIR /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/ MKDIR /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/ CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/libbpf.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/str_error.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/bpf.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/nlattr.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/btf.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/netlink.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/bpf_prog_linfo.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/libbpf_probes.o Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h' CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/hashmap.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/libbpf_errno.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/btf_dump.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/ringbuf.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/strset.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/linker.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/gen_loader.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/relo_core.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/usdt.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/zip.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/elf.o MKDIR /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/ CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/features.o MKDIR /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/ MKDIR /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/ MKDIR /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/ MKDIR /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/ MKDIR /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/ CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/netlink.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/libbpf.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/bpf.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/nlattr.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/bpf_prog_linfo.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/btf.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/libbpf_errno.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/str_error.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/libbpf_probes.o In file included from /tmp/work/bpf/bpf/tools/include/linux/filter.h:8, from features.c:4: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/hashmap.o In file included from bpf_prog_linfo.c:7: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from libbpf.h:18, from libbpf_errno.c:14: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from /tmp/work/bpf/bpf/tools/include/linux/filter.h:8, from gen_loader.c:7: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from bpf.c:30: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from libbpf.c:31: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from libbpf.h:18, from relo_core.c:64: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from bpf_prog_linfo.c:7: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from libbpf.h:18, from libbpf_errno.c:14: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from bpf.c:30: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from ringbuf.c:15: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from libbpf.h:18, from btf_dump.c:22: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from relo_core.h:7, from libbpf_internal.h:20, from strset.c:9: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from bpf.h:26, from usdt.c:18: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from relo_core.h:7, from libbpf_internal.h:20, from nlattr.c:14: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from relo_core.h:7, from libbpf_internal.h:20, from elf.c:11: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from libbpf.h:18, from linker.c:19: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/btf_dump.o In file included from bpf.h:26, from btf.c:20: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from libbpf.c:31: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from relo_core.h:7, from libbpf_internal.h:20, from zip.c:16: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from relo_core.h:7, from libbpf_internal.h:20, from nlattr.c:14: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/bpf_prog_linfo.o] Error 1 make[3]: *** Waiting for unfinished jobs.... make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/strset.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/nlattr.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/libbpf_errno.o] Error 1 CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/ringbuf.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/strset.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/linker.o CC /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/gen_loader.o make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:106: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/bpf_prog_linfo.o] Error 1 make[3]: *** Waiting for unfinished jobs.... In file included from bpf.h:26, from btf.c:20: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/elf.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:106: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/libbpf_errno.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/zip.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/features.o] Error 1 GEN /tmp/work/bpf/bpf/tools/testing/selftests/bpf/bpf-helpers.7 In file included from libbpf.h:18, from btf_dump.c:22: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/usdt.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:106: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/nlattr.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/ringbuf.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/relo_core.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/gen_loader.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/bpf.o] Error 1 In file included from /tmp/work/bpf/bpf/tools/include/linux/filter.h:8, from gen_loader.c:7: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from ringbuf.c:15: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:106: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/bpf.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/btf_dump.o] Error 1 In file included from relo_core.h:7, from libbpf_internal.h:20, from strset.c:9: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ In file included from libbpf.h:18, from linker.c:19: /tmp/work/bpf/bpf/tools/include/uapi/linux/bpf.h:91:2: error: expected specifier-qualifier-list before ‘__struct_group’ 91 | __struct_group(bpf_lpm_trie_key_hdr, hdr, /* no attrs */, | ^~~~~~~~~~~~~~ make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/linker.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/strset.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/btf_dump.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/ringbuf.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/gen_loader.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/btf.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/linker.o] Error 1 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/btf.o] Error 1 GEN /tmp/work/bpf/bpf/tools/testing/selftests/bpf/bpf-syscall.2 make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/libbpf.o] Error 1 make[2]: *** [Makefile:157: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/staticobjs/libbpf-in.o] Error 2 make[2]: *** Waiting for unfinished jobs.... make[3]: *** [/tmp/work/bpf/bpf/tools/build/Makefile.build:105: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/libbpf.o] Error 1 make[2]: *** [Makefile:148: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/sharedobjs/libbpf-in.o] Error 2 make[1]: *** [Makefile:140: all] Error 2 make: *** [Makefile:344: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.a] Error 2 GEN /tmp/work/bpf/bpf/tools/testing/selftests/bpf/bpf-helpers.7 make: Leaving directory '/tmp/work/bpf/bpf/tools/testing/selftests/bpf' Error: Process completed with exit code 2.