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Merge branch 'bpf-obj-name-misc' 

Martin KaFai Lau says:

====================
bpf: Misc improvements and a new usage on bpf obj name

The first two patches make improvements on the bpf obj name.

The last patch adds the prog name to kallsyms.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-10-07 23:29:40 +01:00
parent f192970de8 368211fb92
commit c9f766bc6e
5 changed files with 27 additions and 15 deletions
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4
include/linux/bpf.h
View File

@ -56,7 +56,7 @@ struct bpf_map {
struct work_struct work;
atomic_t usercnt;
struct bpf_map *inner_map_meta;
u8 name[BPF_OBJ_NAME_LEN];
char name[BPF_OBJ_NAME_LEN];
};
/* function argument constraints */
@ -189,7 +189,7 @@ struct bpf_prog_aux {
struct bpf_prog *prog;
struct user_struct *user;
u64 load_time; /* ns since boottime */
u8 name[BPF_OBJ_NAME_LEN];
char name[BPF_OBJ_NAME_LEN];
union {
struct work_struct work;
struct rcu_head rcu;

8
include/uapi/linux/bpf.h
View File

@ -230,7 +230,7 @@ union bpf_attr {
__u32 numa_node; /* numa node (effective only if
* BPF_F_NUMA_NODE is set).
*/
__u8 map_name[BPF_OBJ_NAME_LEN];
char map_name[BPF_OBJ_NAME_LEN];
};
struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
@ -253,7 +253,7 @@ union bpf_attr {
__aligned_u64 log_buf; /* user supplied buffer */
__u32 kern_version; /* checked when prog_type=kprobe */
__u32 prog_flags;
__u8 prog_name[BPF_OBJ_NAME_LEN];
char prog_name[BPF_OBJ_NAME_LEN];
};
struct { /* anonymous struct used by BPF_OBJ_* commands */
@ -888,7 +888,7 @@ struct bpf_prog_info {
__u32 created_by_uid;
__u32 nr_map_ids;
__aligned_u64 map_ids;
__u8 name[BPF_OBJ_NAME_LEN];
char name[BPF_OBJ_NAME_LEN];
} __attribute__((aligned(8)));
struct bpf_map_info {
@ -898,7 +898,7 @@ struct bpf_map_info {
__u32 value_size;
__u32 max_entries;
__u32 map_flags;
__u8 name[BPF_OBJ_NAME_LEN];
char name[BPF_OBJ_NAME_LEN];
} __attribute__((aligned(8)));
/* User bpf_sock_ops struct to access socket values and specify request ops

15
kernel/bpf/core.c
View File

@ -309,11 +309,24 @@ bpf_get_prog_addr_region(const struct bpf_prog *prog,
static void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
{
const char *end = sym + KSYM_NAME_LEN;
BUILD_BUG_ON(sizeof("bpf_prog_") +
sizeof(prog->tag) * 2 + 1 > KSYM_NAME_LEN);
sizeof(prog->tag) * 2 +
/* name has been null terminated.
* We should need +1 for the '_' preceding
* the name. However, the null character
* is double counted between the name and the
* sizeof("bpf_prog_") above, so we omit
* the +1 here.
*/
sizeof(prog->aux->name) > KSYM_NAME_LEN);
sym += snprintf(sym, KSYM_NAME_LEN, "bpf_prog_");
sym = bin2hex(sym, prog->tag, sizeof(prog->tag));
if (prog->aux->name[0])
snprintf(sym, (size_t)(end - sym), "_%s", prog->aux->name);
else
*sym = 0;
}

5
kernel/bpf/syscall.c
View File

@ -322,6 +322,8 @@ static int bpf_obj_name_cpy(char *dst, const char *src)
{
const char *end = src + BPF_OBJ_NAME_LEN;
memset(dst, 0, BPF_OBJ_NAME_LEN);
/* Copy all isalnum() and '_' char */
while (src < end && *src) {
if (!isalnum(*src) && *src != '_')
@ -333,9 +335,6 @@ static int bpf_obj_name_cpy(char *dst, const char *src)
if (src == end)
return -EINVAL;
/* '\0' terminates dst */
*dst = 0;
return 0;
}

8
tools/include/uapi/linux/bpf.h
View File

@ -230,7 +230,7 @@ union bpf_attr {
__u32 numa_node; /* numa node (effective only if
* BPF_F_NUMA_NODE is set).
*/
__u8 map_name[BPF_OBJ_NAME_LEN];
char map_name[BPF_OBJ_NAME_LEN];
};
struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
@ -253,7 +253,7 @@ union bpf_attr {
__aligned_u64 log_buf; /* user supplied buffer */
__u32 kern_version; /* checked when prog_type=kprobe */
__u32 prog_flags;
__u8 prog_name[BPF_OBJ_NAME_LEN];
char prog_name[BPF_OBJ_NAME_LEN];
};
struct { /* anonymous struct used by BPF_OBJ_* commands */
@ -871,7 +871,7 @@ struct bpf_prog_info {
__u32 created_by_uid;
__u32 nr_map_ids;
__aligned_u64 map_ids;
__u8 name[BPF_OBJ_NAME_LEN];
char name[BPF_OBJ_NAME_LEN];
} __attribute__((aligned(8)));
struct bpf_map_info {
@ -881,7 +881,7 @@ struct bpf_map_info {
__u32 value_size;
__u32 max_entries;
__u32 map_flags;
__u8 name[BPF_OBJ_NAME_LEN];
char name[BPF_OBJ_NAME_LEN];
} __attribute__((aligned(8)));
/* User bpf_sock_ops struct to access socket values and specify request ops