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bpf: Change bpf_obj_name_cpy() to better ensure map's name is init by 0

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During get_info_by_fd, the prog/map name is memcpy-ed.  It depends
on the prog->aux->name and map->name to be zero initialized.

bpf_prog_aux is easy to guarantee that aux->name is zero init.

The name in bpf_map may be harder to be guaranteed in the future when
new map type is added.

Hence, this patch makes bpf_obj_name_cpy() to always zero init
the prog/map name.

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau 2017-10-05 21:52:11 -07:00 committed by David S. Miller
parent f192970de8
commit 473d97343f
1 changed files with 2 additions and 3 deletions
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5
kernel/bpf/syscall.c
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@ -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;
}