Re: [PATCH v4 11/12] security, crypto: LLVMLinux: Remove VLAIS from ima_crypto.c
From: Dmitry Kasatkin <hidden>
Date: 2014-09-23 08:55:00
Also in:
dm-devel, linux-btrfs, linux-crypto, lkml
On 23/09/14 07:42, behanw@converseincode.com wrote:
From: Behan Webster <redacted> Replaced the use of a Variable Length Array In Struct (VLAIS) with a C99 compliant equivalent. This patch allocates the appropriate amount of memory using a char array using the SHASH_DESC_ON_STACK macro. The new code can be compiled with both gcc and clang. Signed-off-by: Behan Webster <redacted> Reviewed-by: Mark Charlebois <redacted> Reviewed-by: Jan-Simon Möller <redacted> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Cc: tglx@linutronix.de
Looks good. Thanks. Acked-by: Dmitry Kasatkin <redacted>
quoted hunk ↗ jump to hunk
--- security/integrity/ima/ima_crypto.c | 47 +++++++++++++++---------------------- 1 file changed, 19 insertions(+), 28 deletions(-)diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c index 0bd7328..e35f5d9 100644 --- a/security/integrity/ima/ima_crypto.c +++ b/security/integrity/ima/ima_crypto.c@@ -380,17 +380,14 @@ static int ima_calc_file_hash_tfm(struct file *file, loff_t i_size, offset = 0; char *rbuf; int rc, read = 0; - struct { - struct shash_desc shash; - char ctx[crypto_shash_descsize(tfm)]; - } desc; + SHASH_DESC_ON_STACK(shash, tfm); - desc.shash.tfm = tfm; - desc.shash.flags = 0; + shash->tfm = tfm; + shash->flags = 0; hash->length = crypto_shash_digestsize(tfm); - rc = crypto_shash_init(&desc.shash); + rc = crypto_shash_init(shash); if (rc != 0) return rc;@@ -420,7 +417,7 @@ static int ima_calc_file_hash_tfm(struct file *file, break; offset += rbuf_len; - rc = crypto_shash_update(&desc.shash, rbuf, rbuf_len); + rc = crypto_shash_update(shash, rbuf, rbuf_len); if (rc) break; }@@ -429,7 +426,7 @@ static int ima_calc_file_hash_tfm(struct file *file, kfree(rbuf); out: if (!rc) - rc = crypto_shash_final(&desc.shash, hash->digest); + rc = crypto_shash_final(shash, hash->digest); return rc; }@@ -487,18 +484,15 @@ static int ima_calc_field_array_hash_tfm(struct ima_field_data *field_data, struct ima_digest_data *hash, struct crypto_shash *tfm) { - struct { - struct shash_desc shash; - char ctx[crypto_shash_descsize(tfm)]; - } desc; + SHASH_DESC_ON_STACK(shash, tfm); int rc, i; - desc.shash.tfm = tfm; - desc.shash.flags = 0; + shash->tfm = tfm; + shash->flags = 0; hash->length = crypto_shash_digestsize(tfm); - rc = crypto_shash_init(&desc.shash); + rc = crypto_shash_init(shash); if (rc != 0) return rc;@@ -508,7 +502,7 @@ static int ima_calc_field_array_hash_tfm(struct ima_field_data *field_data, u32 datalen = field_data[i].len; if (strcmp(td->name, IMA_TEMPLATE_IMA_NAME) != 0) { - rc = crypto_shash_update(&desc.shash, + rc = crypto_shash_update(shash, (const u8 *) &field_data[i].len, sizeof(field_data[i].len)); if (rc)@@ -518,13 +512,13 @@ static int ima_calc_field_array_hash_tfm(struct ima_field_data *field_data, data_to_hash = buffer; datalen = IMA_EVENT_NAME_LEN_MAX + 1; } - rc = crypto_shash_update(&desc.shash, data_to_hash, datalen); + rc = crypto_shash_update(shash, data_to_hash, datalen); if (rc) break; } if (!rc) - rc = crypto_shash_final(&desc.shash, hash->digest); + rc = crypto_shash_final(shash, hash->digest); return rc; }@@ -565,15 +559,12 @@ static int __init ima_calc_boot_aggregate_tfm(char *digest, { u8 pcr_i[TPM_DIGEST_SIZE]; int rc, i; - struct { - struct shash_desc shash; - char ctx[crypto_shash_descsize(tfm)]; - } desc; + SHASH_DESC_ON_STACK(shash, tfm); - desc.shash.tfm = tfm; - desc.shash.flags = 0; + shash->tfm = tfm; + shash->flags = 0; - rc = crypto_shash_init(&desc.shash); + rc = crypto_shash_init(shash); if (rc != 0) return rc;@@ -581,10 +572,10 @@ static int __init ima_calc_boot_aggregate_tfm(char *digest, for (i = TPM_PCR0; i < TPM_PCR8; i++) { ima_pcrread(i, pcr_i); /* now accumulate with current aggregate */ - rc = crypto_shash_update(&desc.shash, pcr_i, TPM_DIGEST_SIZE); + rc = crypto_shash_update(shash, pcr_i, TPM_DIGEST_SIZE); } if (!rc) - crypto_shash_final(&desc.shash, digest); + crypto_shash_final(shash, digest); return rc; }
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