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authorEdward Shishkin <edward@redhat.com>2014-10-27 21:35:16 +0100
committerVijay Bellur <vbellur@redhat.com>2014-11-30 21:41:27 -0800
commit45af6c5fc385f2c948bdb387585b3e0a41ccbcde (patch)
treed06364c2d4912ae1363e43bf6fb402f0478a08e8 /xlators/encryption/crypt
parentdcbab25710aa60a22708a0de8c41735bfca06d07 (diff)
Prevent metadata corruption in the race conditions between
FOP->open() and FOP->link(). Problem: crypt_open() modifies @local->format, which is used by crypt_link() to store the updated metadata string on disk. This results in metadata corruption. Fixup: Don't modify @local->format by FOP->open(). Instead modify a local copy, allocated in the low-level meta-data handler open_format_v1(). Change-Id: I046bb39ddefc33afe59c8d3b1a2fa798298f8499 BUG: 1157839 Signed-off-by: Edward Shishkin <edward@redhat.com> Reviewed-on: http://review.gluster.org/8982 Reviewed-by: Emmanuel Dreyfus <manu@netbsd.org> Tested-by: Emmanuel Dreyfus <manu@netbsd.org> Tested-by: Gluster Build System <jenkins@build.gluster.com>
Diffstat (limited to 'xlators/encryption/crypt')
-rw-r--r--xlators/encryption/crypt/src/metadata.c32
1 files changed, 23 insertions, 9 deletions
diff --git a/xlators/encryption/crypt/src/metadata.c b/xlators/encryption/crypt/src/metadata.c
index 36b14c0558e..ebc76c84eb2 100644
--- a/xlators/encryption/crypt/src/metadata.c
+++ b/xlators/encryption/crypt/src/metadata.c
@@ -475,24 +475,30 @@ static int32_t open_format_v1(unsigned char *wire,
num_nmtd_macs = check_format_v1(len, wire);
if (num_nmtd_macs <= 0)
return EIO;
- fmt = (struct mtd_format_v1 *)wire;
- ret = lookup_link_mac_v1(fmt, num_nmtd_macs, loc, info, master);
+ ret = lookup_link_mac_v1((struct mtd_format_v1 *)wire,
+ num_nmtd_macs, loc, info, master);
if (ret < 0) {
gf_log("crypt", GF_LOG_ERROR, "NMTD verification failed");
return EINVAL;
}
+
local->mac_idx = ret;
if (load_info == _gf_false)
/* the case of partial open */
return 0;
+ fmt = GF_CALLOC(1, len, gf_crypt_mt_mtd);
+ if (!fmt)
+ return ENOMEM;
+ memcpy(fmt, wire, len);
+
object = &info->cinfo;
ret = get_emtd_file_key(info, master, mtd_key);
if (ret) {
gf_log("crypt", GF_LOG_ERROR, "Can not retrieve metadata key");
- return ret;
+ goto out;
}
/*
* decrypt encrypted meta-data
@@ -500,12 +506,14 @@ static int32_t open_format_v1(unsigned char *wire,
ret = AES_set_encrypt_key(mtd_key, sizeof(mtd_key)*8, &EMTD_KEY);
if (ret < 0) {
gf_log("crypt", GF_LOG_ERROR, "Can not set encrypt key");
- return ret;
+ ret = EIO;
+ goto out;
}
gctx = CRYPTO_gcm128_new(&EMTD_KEY, (block128_f)AES_encrypt);
if (!gctx) {
gf_log("crypt", GF_LOG_ERROR, "Can not alloc gcm context");
- return ENOMEM;
+ ret = ENOMEM;
+ goto out;
}
CRYPTO_gcm128_setiv(gctx, info->oid, sizeof(uuid_t));
@@ -514,7 +522,8 @@ static int32_t open_format_v1(unsigned char *wire,
if (ret) {
gf_log("crypt", GF_LOG_ERROR, " CRYPTO_gcm128_aad failed");
CRYPTO_gcm128_release(gctx);
- return ret;
+ ret = EIO;
+ goto out;
}
ret = CRYPTO_gcm128_decrypt(gctx,
get_EMTD_V1(fmt),
@@ -523,7 +532,8 @@ static int32_t open_format_v1(unsigned char *wire,
if (ret) {
gf_log("crypt", GF_LOG_ERROR, " CRYPTO_gcm128_decrypt failed");
CRYPTO_gcm128_release(gctx);
- return ret;
+ ret = EIO;
+ goto out;
}
/*
* verify metadata
@@ -532,7 +542,8 @@ static int32_t open_format_v1(unsigned char *wire,
CRYPTO_gcm128_release(gctx);
if (memcmp(gmac, get_EMTD_V1_MAC(fmt), SIZE_OF_EMTD_V1_MAC)) {
gf_log("crypt", GF_LOG_ERROR, "EMTD verification failed");
- return EINVAL;
+ ret = EINVAL;
+ goto out;
}
/*
* load verified metadata to the private part of inode
@@ -544,7 +555,10 @@ static int32_t open_format_v1(unsigned char *wire,
object->o_block_bits = fmt->block_bits;
object->o_mode = fmt->mode_id;
- return check_file_metadata(info);
+ ret = check_file_metadata(info);
+ out:
+ GF_FREE(fmt);
+ return ret;
}
/*