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libbpf: Make gen_loader data aligned.

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Align gen_loader data to 8 byte boundary to make sure union bpf_attr,
bpf_insns and other structs are aligned.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210927145941.1383001-9-memxor@gmail.com
This commit is contained in:
Alexei Starovoitov
2021-09-27 20:29:37 +05:30
committed by Andrii Nakryiko
parent b0feb9b4d5
commit f49c65d216
1 changed files with 6 additions and 1 deletions
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7
src/gen_loader.c
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@@ -5,6 +5,7 @@
#include <string.h> #include <string.h>
#include <errno.h> #include <errno.h>
#include <linux/filter.h> #include <linux/filter.h>
#include <sys/param.h>
#include "btf.h" #include "btf.h"
#include "bpf.h" #include "bpf.h"
#include "libbpf.h" #include "libbpf.h"
@@ -135,13 +136,17 @@ void bpf_gen__init(struct bpf_gen *gen, int log_level)
static int add_data(struct bpf_gen *gen, const void *data, __u32 size) static int add_data(struct bpf_gen *gen, const void *data, __u32 size)
{ {
__u32 size8 = roundup(size, 8);
__u64 zero = 0;
void *prev; void *prev;
if (realloc_data_buf(gen, size)) if (realloc_data_buf(gen, size8))
return 0; return 0;
prev = gen->data_cur; prev = gen->data_cur;
memcpy(gen->data_cur, data, size); memcpy(gen->data_cur, data, size);
gen->data_cur += size; gen->data_cur += size;
memcpy(gen->data_cur, &zero, size8 - size);
gen->data_cur += size8 - size;
return prev - gen->data_start; return prev - gen->data_start;
} }