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Use explicit_bzero() instead of bzero() for sensitive data.

Browse Source 
Reviewed by:	delphij
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D25441
This commit is contained in:
John Baldwin 2020-06-25 20:25:35 +00:00
parent 9b6dc28176
commit 6572e5ff66
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=362629
4 changed files with 18 additions and 18 deletions
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10
sys/geom/bde/g_bde.c
View File

@ -88,7 +88,7 @@ g_bde_orphan(struct g_consumer *cp)
gp->flags |= G_GEOM_WITHER;
LIST_FOREACH(pp, &gp->provider, provider)
g_wither_provider(pp, ENXIO);
bzero(sc, sizeof(struct g_bde_softc)); /* destroy evidence */
explicit_bzero(sc, sizeof(struct g_bde_softc)); /* destroy evidence */
return;
}
@ -163,7 +163,7 @@ g_bde_create_geom(struct gctl_req *req, struct g_class *mp, struct g_provider *p
error = g_bde_decrypt_lock(sc, pass, key,
mediasize, sectorsize, NULL);
bzero(sc->sha2, sizeof sc->sha2);
explicit_bzero(sc->sha2, sizeof sc->sha2);
if (error)
break;
kp = &sc->key;
@ -195,9 +195,9 @@ g_bde_create_geom(struct gctl_req *req, struct g_class *mp, struct g_provider *p
break;
} while (0);
if (pass != NULL)
bzero(pass, SHA512_DIGEST_LENGTH);
explicit_bzero(pass, SHA512_DIGEST_LENGTH);
if (key != NULL)
bzero(key, 16);
explicit_bzero(key, 16);
if (error == 0)
return;
g_access(cp, -1, -1, -1);
@ -255,7 +255,7 @@ g_bde_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
while (sc->dead != 2 && !LIST_EMPTY(&pp->consumers))
tsleep(sc, PRIBIO, "g_bdedie", hz);
mtx_destroy(&sc->worklist_mutex);
bzero(&sc->key, sizeof sc->key);
explicit_bzero(&sc->key, sizeof sc->key);
g_free(sc);
g_wither_geom(gp, ENXIO);
return (0);

12
sys/geom/bde/g_bde_lock.c
View File

@ -316,9 +316,9 @@ g_bde_keyloc_encrypt(u_char *sha2, uint64_t v0, uint64_t v1, void *output)
AES_init(&ci);
AES_makekey(&ki, DIR_ENCRYPT, G_BDE_KKEYBITS, sha2 + 0);
AES_encrypt(&ci, &ki, buf, output, sizeof buf);
bzero(buf, sizeof buf);
bzero(&ci, sizeof ci);
bzero(&ki, sizeof ki);
explicit_bzero(buf, sizeof buf);
explicit_bzero(&ci, sizeof ci);
explicit_bzero(&ki, sizeof ki);
return (0);
}
@ -333,9 +333,9 @@ g_bde_keyloc_decrypt(u_char *sha2, void *input, uint64_t *output)
AES_makekey(&ki, DIR_DECRYPT, G_BDE_KKEYBITS, sha2 + 0);
AES_decrypt(&ci, &ki, input, buf, sizeof buf);
*output = le64dec(buf);
bzero(buf, sizeof buf);
bzero(&ci, sizeof ci);
bzero(&ki, sizeof ki);
explicit_bzero(buf, sizeof buf);
explicit_bzero(&ci, sizeof ci);
explicit_bzero(&ki, sizeof ki);
return(0);
}

10
sys/geom/eli/g_eli.c
View File

@ -1126,7 +1126,7 @@ g_eli_keyfiles_clear(const char *provider)
data = preload_fetch_addr(keyfile);
size = preload_fetch_size(keyfile);
if (data != NULL && size != 0)
bzero(data, size);
explicit_bzero(data, size);
}
}
@ -1261,7 +1261,7 @@ g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt,
sizeof(md.md_salt), passphrase, md.md_iterations);
bzero(passphrase, sizeof(passphrase));
explicit_bzero(passphrase, sizeof(passphrase));
g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey));
explicit_bzero(dkey, sizeof(dkey));
}
@ -1272,7 +1272,7 @@ g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
* Decrypt Master-Key.
*/
error = g_eli_mkey_decrypt_any(&md, key, mkey, &nkey);
bzero(key, sizeof(key));
explicit_bzero(key, sizeof(key));
if (error == -1) {
if (i == tries) {
G_ELI_DEBUG(0,
@ -1305,8 +1305,8 @@ g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
* We have correct key, let's attach provider.
*/
gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey);
bzero(mkey, sizeof(mkey));
bzero(&md, sizeof(md));
explicit_bzero(mkey, sizeof(mkey));
explicit_bzero(&md, sizeof(md));
if (gp == NULL) {
G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name,
G_ELI_SUFFIX);

4
sys/geom/shsec/g_shsec.c
View File

@ -269,7 +269,7 @@ g_shsec_done(struct bio *bp)
(ssize_t)pbp->bio_length);
}
}
bzero(bp->bio_data, bp->bio_length);
explicit_bzero(bp->bio_data, bp->bio_length);
uma_zfree(g_shsec_zone, bp->bio_data);
g_destroy_bio(bp);
pbp->bio_inbed++;
@ -384,7 +384,7 @@ g_shsec_start(struct bio *bp)
TAILQ_REMOVE(&queue, cbp, bio_queue);
bp->bio_children--;
if (cbp->bio_data != NULL) {
bzero(cbp->bio_data, cbp->bio_length);
explicit_bzero(cbp->bio_data, cbp->bio_length);
uma_zfree(g_shsec_zone, cbp->bio_data);
}
g_destroy_bio(cbp);