David S. Miller wrote:
struct ethtool_perm_addr {
unsigned int cmd;
int size;
char data[0];
};
and the user says how large his buffer is in the request,
and if that is not large enough you return -ETOOBIG or
some similarly discernable error code so that userspace
can allocate a larger buffer. In fact, the kernel can
rewrite the "size" field in this case to indicate how
large the buffer needs to be to hold the full address.
Agreed.
Jeff
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