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gcc 11 cleanup

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Compiling with gcc 11.1.0 produces three new warnings.
Change the code slightly to avoid them.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Attila Fülöp <attila@fueloep.org>
Closes #12130
Closes #12188
Closes #12237
This commit is contained in:
Attila Fülöp 2021-06-24 01:57:06 +02:00 committed by GitHub
parent 63f4b959a6
commit 1b610ae45f
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 27 additions and 13 deletions
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12
contrib/pam_zfs_key/pam_zfs_key.c
View File

@ -82,7 +82,11 @@ alloc_pw_size(size_t len)
return (NULL);
}
pw->len = len;
pw->value = malloc(len);
/*
* The use of malloc() triggers a spurious gcc 11 -Wmaybe-uninitialized
* warning in the mlock() function call below, so use calloc().
*/
pw->value = calloc(len, 1);
if (!pw->value) {
free(pw);
return (NULL);
@ -99,7 +103,11 @@ alloc_pw_string(const char *source)
return (NULL);
}
pw->len = strlen(source) + 1;
pw->value = malloc(pw->len);
/*
* The use of malloc() triggers a spurious gcc 11 -Wmaybe-uninitialized
* warning in the mlock() function call below, so use calloc().
*/
pw->value = calloc(pw->len, 1);
if (!pw->value) {
free(pw);
return (NULL);

2
include/sys/crypto/api.h
View File

@ -58,7 +58,7 @@ typedef struct {
*/
#define CRYPTO_MECH_INVALID ((uint64_t)-1)
extern crypto_mech_type_t crypto_mech2id(crypto_mech_name_t name);
extern crypto_mech_type_t crypto_mech2id(char *name);
/*
* Create and destroy context templates.

6
include/sys/dnode.h
View File

@ -171,7 +171,7 @@ enum dnode_dirtycontext {
* example, reading 32 dnodes from a 16k dnode block and all of the spill
* blocks could issue 33 separate reads. Now suppose those dnodes have size
* 1024 and therefore don't need spill blocks. Then the worst case number
* of blocks read is reduced to from 33 to two--one per dnode block.
* of blocks read is reduced from 33 to two--one per dnode block.
*
* ZFS-on-Linux systems that make heavy use of extended attributes benefit
* from this feature. In particular, ZFS-on-Linux supports the xattr=sa
@ -232,8 +232,8 @@ typedef struct dnode_phys {
* Both dn_pad2 and dn_pad3 are protected by the block's MAC. This
* allows us to protect any fields that might be added here in the
* future. In either case, developers will want to check
* zio_crypt_init_uios_dnode() to ensure the new field is being
* protected properly.
* zio_crypt_init_uios_dnode() and zio_crypt_do_dnode_hmac_updates()
* to ensure the new field is being protected and updated properly.
*/
uint64_t dn_pad3[4];

20
module/os/linux/zfs/zio_crypt.c
View File

@ -190,7 +190,7 @@ unsigned long zfs_key_max_salt_uses = ZFS_KEY_MAX_SALT_USES_DEFAULT;
typedef struct blkptr_auth_buf {
uint64_t bab_prop; /* blk_prop - portable mask */
uint8_t bab_mac[ZIO_DATA_MAC_LEN]; /* MAC from blk_cksum */
uint8_t bab_mac[ZIO_DATA_MAC_LEN]; /* MAC from blk_cksum */
uint64_t bab_pad; /* reserved for future use */
} blkptr_auth_buf_t;
@ -1045,17 +1045,23 @@ zio_crypt_do_dnode_hmac_updates(crypto_context_t ctx, uint64_t version,
boolean_t should_bswap, dnode_phys_t *dnp)
{
int ret, i;
dnode_phys_t *adnp;
dnode_phys_t *adnp, tmp_dncore;
size_t dn_core_size = offsetof(dnode_phys_t, dn_blkptr);
boolean_t le_bswap = (should_bswap == ZFS_HOST_BYTEORDER);
crypto_data_t cd;
uint8_t tmp_dncore[offsetof(dnode_phys_t, dn_blkptr)];
cd.cd_format = CRYPTO_DATA_RAW;
cd.cd_offset = 0;
/* authenticate the core dnode (masking out non-portable bits) */
bcopy(dnp, tmp_dncore, sizeof (tmp_dncore));
adnp = (dnode_phys_t *)tmp_dncore;
/*
* Authenticate the core dnode (masking out non-portable bits).
* We only copy the first 64 bytes we operate on to avoid the overhead
* of copying 512-64 unneeded bytes. The compiler seems to be fine
* with that.
*/
bcopy(dnp, &tmp_dncore, dn_core_size);
adnp = &tmp_dncore;
if (le_bswap) {
adnp->dn_datablkszsec = BSWAP_16(adnp->dn_datablkszsec);
adnp->dn_bonuslen = BSWAP_16(adnp->dn_bonuslen);
@ -1065,7 +1071,7 @@ zio_crypt_do_dnode_hmac_updates(crypto_context_t ctx, uint64_t version,
adnp->dn_flags &= DNODE_CRYPT_PORTABLE_FLAGS_MASK;
adnp->dn_used = 0;
cd.cd_length = sizeof (tmp_dncore);
cd.cd_length = dn_core_size;
cd.cd_raw.iov_base = (char *)adnp;
cd.cd_raw.iov_len = cd.cd_length;