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libbpf: Sanitise internal map names so they are not rejected by the kernel

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The kernel only accepts map names with alphanumeric characters, underscores
and periods in their name. However, the auto-generated internal map names
used by libbpf takes their prefix from the user-supplied BPF object name,
which has no such restriction. This can lead to "Invalid argument" errors
when trying to load a BPF program using global variables.

Fix this by sanitising the map names, replacing any non-allowed characters
with underscores.

Fixes: d859900c4c ("bpf, libbpf: support global data/bss/rodata sections")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200217171701.215215-1-toke@redhat.com
This commit is contained in:
Toke Høiland-Jørgensen 2020-02-17 18:17:01 +01:00 committed by Daniel Borkmann
parent f25975f42f
commit 113e6b7e15
1 changed files with 7 additions and 1 deletions
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8
tools/lib/bpf/libbpf.c
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@ -24,6 +24,7 @@
#include <endian.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <asm/unistd.h>
#include <linux/err.h>
#include <linux/kernel.h>
@ -1283,7 +1284,7 @@ static size_t bpf_map_mmap_sz(const struct bpf_map *map)
static char *internal_map_name(struct bpf_object *obj,
enum libbpf_map_type type)
{
char map_name[BPF_OBJ_NAME_LEN];
char map_name[BPF_OBJ_NAME_LEN], *p;
const char *sfx = libbpf_type_to_btf_name[type];
int sfx_len = max((size_t)7, strlen(sfx));
int pfx_len = min((size_t)BPF_OBJ_NAME_LEN - sfx_len - 1,
@ -1292,6 +1293,11 @@ static char *internal_map_name(struct bpf_object *obj,
snprintf(map_name, sizeof(map_name), "%.*s%.*s", pfx_len, obj->name,
sfx_len, libbpf_type_to_btf_name[type]);
/* sanitise map name to characters allowed by kernel */
for (p = map_name; *p && p < map_name + sizeof(map_name); p++)
if (!isalnum(*p) && *p != '_' && *p != '.')
*p = '_';
return strdup(map_name);
}