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bpf: Move check_uarg_tail_zero() upward

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The function check_uarg_tail_zero() may be useful for other part of the
code in the syscall.c file. Move this function at the beginning of the
file.

Signed-off-by: Mickaël Salaün <[email protected]>
Acked-by: Daniel Borkmann <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Martin KaFai Lau <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Mickaël Salaün 2017-08-07 20:45:19 +02:00 • committed by David S. Miller
commit 58291a7465
1 changed files with 26 additions and 26 deletions
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52
kernel/bpf/syscall.c
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@ -48,6 +48,32 @@ static const struct bpf_map_ops * const bpf_map_types[] = {
#undef BPF_MAP_TYPE
};
static int check_uarg_tail_zero(void __user *uaddr,
size_t expected_size,
size_t actual_size)
{
unsigned char __user *addr;
unsigned char __user *end;
unsigned char val;
int err;
if (actual_size <= expected_size)
return 0;
addr = uaddr + expected_size;
end = uaddr + actual_size;
for (; addr < end; addr++) {
err = get_user(val, addr);
if (err)
return err;
if (val)
return -E2BIG;
}
return 0;
}
static struct bpf_map *find_and_alloc_map(union bpf_attr *attr)
{
struct bpf_map *map;
@ -1246,32 +1272,6 @@ static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
return fd;
}
static int check_uarg_tail_zero(void __user *uaddr,
size_t expected_size,
size_t actual_size)
{
unsigned char __user *addr;
unsigned char __user *end;
unsigned char val;
int err;
if (actual_size <= expected_size)
return 0;
addr = uaddr + expected_size;
end = uaddr + actual_size;
for (; addr < end; addr++) {
err = get_user(val, addr);
if (err)
return err;
if (val)
return -E2BIG;
}
return 0;
}
static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
const union bpf_attr *attr,
union bpf_attr __user *uattr)