diff options
| author | Eric Biggers <[email protected]> | 2017-07-13 13:16:56 +0100 |
|---|---|---|
| committer | James Morris <[email protected]> | 2017-07-14 11:01:38 +1000 |
| commit | 4f9dabfaf8df971f8a3b6aa324f8f817be38d538 (patch) | |
| tree | d7825b3a87a89699417b255c71018998482ae4cd | |
| parent | 5ccbdbf9870fe9efe78d77df23d5e7d8641c36f8 (diff) | |
KEYS: DH: validate __spare field
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: [email protected]
Signed-off-by: Eric Biggers <[email protected]>
Signed-off-by: David Howells <[email protected]>
Signed-off-by: James Morris <[email protected]>
| -rw-r--r-- | security/keys/compat_dh.c | 2 | ||||
| -rw-r--r-- | security/keys/dh.c | 5 |
2 files changed, 7 insertions, 0 deletions
diff --git a/security/keys/compat_dh.c b/security/keys/compat_dh.c index a6a659b6bcb6..aa6b34cafe5f 100644 --- a/security/keys/compat_dh.c +++ b/security/keys/compat_dh.c @@ -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); } diff --git a/security/keys/dh.c b/security/keys/dh.c index 4755d4b4f945..d1ea9f325f94 100644 --- a/security/keys/dh.c +++ b/security/keys/dh.c @@ -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; |