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bpf: Use kvmalloc for map keys in syscalls

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Same as previous patch but for the keys. memdup_bpfptr is renamed
to kvmemdup_bpfptr (and converted to kvmalloc).

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20210818235216.1159202-2-sdf@google.com
This commit is contained in:
Stanislav Fomichev 2021-08-18 16:52:16 -07:00 • committed by Daniel Borkmann
parent f0dce1d9b7
commit 44779a4b85
2 changed files with 27 additions and 19 deletions
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12
include/linux/bpfptr.h
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@ -62,9 +62,17 @@ static inline int copy_to_bpfptr_offset(bpfptr_t dst, size_t offset,
return copy_to_sockptr_offset((sockptr_t) dst, offset, src, size);
}
static inline void *memdup_bpfptr(bpfptr_t src, size_t len)
static inline void *kvmemdup_bpfptr(bpfptr_t src, size_t len)
{
return memdup_sockptr((sockptr_t) src, len);
void *p = kvmalloc(len, GFP_USER | __GFP_NOWARN);
if (!p)
return ERR_PTR(-ENOMEM);
if (copy_from_bpfptr(p, src, len)) {
kvfree(p);
return ERR_PTR(-EFAULT);
}
return p;
}
static inline long strncpy_from_bpfptr(char *dst, bpfptr_t src, size_t count)