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KEYS: DH: validate __spare field

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Syscalls must validate that their reserved arguments are zero and return
EINVAL otherwise.  Otherwise, it will be impossible to actually use them
for anything in the future because existing programs may be passing
garbage in.  This is standard practice when adding new APIs.

Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
This commit is contained in:
Eric Biggers 2017-07-13 13:16:56 +01:00 committed by James Morris
parent 5ccbdbf987
commit 4f9dabfaf8
2 changed files with 7 additions and 0 deletions
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2
security/keys/compat_dh.c
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@ -33,6 +33,8 @@ long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params,
kdfcopy.hashname = compat_ptr(compat_kdfcopy.hashname);
kdfcopy.otherinfo = compat_ptr(compat_kdfcopy.otherinfo);
kdfcopy.otherinfolen = compat_kdfcopy.otherinfolen;
memcpy(kdfcopy.__spare, compat_kdfcopy.__spare,
sizeof(kdfcopy.__spare));
return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy);
}

5
security/keys/dh.c
View File

@ -266,6 +266,11 @@ long __keyctl_dh_compute(struct keyctl_dh_params __user *params,
if (kdfcopy) {
char *hashname;
if (memchr_inv(kdfcopy->__spare, 0, sizeof(kdfcopy->__spare))) {
ret = -EINVAL;
goto out1;
}
if (buflen > KEYCTL_KDF_MAX_OUTPUT_LEN ||
kdfcopy->otherinfolen > KEYCTL_KDF_MAX_OI_LEN) {
ret = -EMSGSIZE;