This patch converts SELinux code from kmalloc/memset to the new kazalloc
function. On i386, this results in a text saving of over 1K.
Before:
text data bss dec hex filename
86319 4642 15236 106197 19ed5 security/selinux/built-in.o
After:
text data bss dec hex filename
85278 4642 15236 105156 19ac4 security/selinux/built-in.o
Please apply.
Signed-off-by: James Morris <[email protected]>
Signed-off-by: Stephen Smalley <[email protected]>
---
security/selinux/hooks.c | 24 +++++------------
security/selinux/netif.c | 3 --
security/selinux/selinuxfs.c | 30 +++++++---------------
security/selinux/ss/conditional.c | 12 ++------
security/selinux/ss/ebitmap.c | 9 ++----
security/selinux/ss/hashtab.c | 6 +---
security/selinux/ss/policydb.c | 51 ++++++++++++--------------------------
security/selinux/ss/services.c | 9 ++----
8 files changed, 48 insertions(+), 96 deletions(-)
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/hooks.c linux-2.6.13-mm2.w/security/selinux/hooks.c
--- linux-2.6.13-mm2.o/security/selinux/hooks.c 2005-09-12 11:28:57.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/hooks.c 2005-09-13 10:24:43.000000000 -0400
@@ -122,11 +122,10 @@ static int task_alloc_security(struct ta
{
struct task_security_struct *tsec;
- tsec = kmalloc(sizeof(struct task_security_struct), GFP_KERNEL);
+ tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
if (!tsec)
return -ENOMEM;
- memset(tsec, 0, sizeof(struct task_security_struct));
tsec->magic = SELINUX_MAGIC;
tsec->task = task;
tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED;
@@ -151,11 +150,10 @@ static int inode_alloc_security(struct i
struct task_security_struct *tsec = current->security;
struct inode_security_struct *isec;
- isec = kmalloc(sizeof(struct inode_security_struct), GFP_KERNEL);
+ isec = kzalloc(sizeof(struct inode_security_struct), GFP_KERNEL);
if (!isec)
return -ENOMEM;
- memset(isec, 0, sizeof(struct inode_security_struct));
init_MUTEX(&isec->sem);
INIT_LIST_HEAD(&isec->list);
isec->magic = SELINUX_MAGIC;
@@ -193,11 +191,10 @@ static int file_alloc_security(struct fi
struct task_security_struct *tsec = current->security;
struct file_security_struct *fsec;
- fsec = kmalloc(sizeof(struct file_security_struct), GFP_ATOMIC);
+ fsec = kzalloc(sizeof(struct file_security_struct), GFP_ATOMIC);
if (!fsec)
return -ENOMEM;
- memset(fsec, 0, sizeof(struct file_security_struct));
fsec->magic = SELINUX_MAGIC;
fsec->file = file;
if (tsec && tsec->magic == SELINUX_MAGIC) {
@@ -227,11 +224,10 @@ static int superblock_alloc_security(str
{
struct superblock_security_struct *sbsec;
- sbsec = kmalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
+ sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
if (!sbsec)
return -ENOMEM;
- memset(sbsec, 0, sizeof(struct superblock_security_struct));
init_MUTEX(&sbsec->sem);
INIT_LIST_HEAD(&sbsec->list);
INIT_LIST_HEAD(&sbsec->isec_head);
@@ -269,11 +265,10 @@ static int sk_alloc_security(struct sock
if (family != PF_UNIX)
return 0;
- ssec = kmalloc(sizeof(*ssec), priority);
+ ssec = kzalloc(sizeof(*ssec), priority);
if (!ssec)
return -ENOMEM;
- memset(ssec, 0, sizeof(*ssec));
ssec->magic = SELINUX_MAGIC;
ssec->sk = sk;
ssec->peer_sid = SECINITSID_UNLABELED;
@@ -1467,11 +1462,10 @@ static int selinux_bprm_alloc_security(s
{
struct bprm_security_struct *bsec;
- bsec = kmalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
+ bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
if (!bsec)
return -ENOMEM;
- memset(bsec, 0, sizeof *bsec);
bsec->magic = SELINUX_MAGIC;
bsec->bprm = bprm;
bsec->sid = SECINITSID_UNLABELED;
@@ -3581,11 +3575,10 @@ static int ipc_alloc_security(struct tas
struct task_security_struct *tsec = task->security;
struct ipc_security_struct *isec;
- isec = kmalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
+ isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
if (!isec)
return -ENOMEM;
- memset(isec, 0, sizeof(struct ipc_security_struct));
isec->magic = SELINUX_MAGIC;
isec->sclass = sclass;
isec->ipc_perm = perm;
@@ -3613,11 +3606,10 @@ static int msg_msg_alloc_security(struct
{
struct msg_security_struct *msec;
- msec = kmalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
+ msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
if (!msec)
return -ENOMEM;
- memset(msec, 0, sizeof(struct msg_security_struct));
msec->magic = SELINUX_MAGIC;
msec->msg = msg;
msec->sid = SECINITSID_UNLABELED;
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/netif.c linux-2.6.13-mm2.w/security/selinux/netif.c
--- linux-2.6.13-mm2.o/security/selinux/netif.c 2005-03-02 02:38:09.000000000 -0500
+++ linux-2.6.13-mm2.w/security/selinux/netif.c 2005-09-13 10:25:21.000000000 -0400
@@ -114,13 +114,12 @@ static struct sel_netif *sel_netif_looku
if (likely(netif != NULL))
goto out;
- new = kmalloc(sizeof(*new), GFP_ATOMIC);
+ new = kzalloc(sizeof(*new), GFP_ATOMIC);
if (!new) {
netif = ERR_PTR(-ENOMEM);
goto out;
}
- memset(new, 0, sizeof(*new));
nsec = &new->nsec;
ret = security_netif_sid(dev->name, &nsec->if_sid, &nsec->msg_sid);
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/selinuxfs.c linux-2.6.13-mm2.w/security/selinux/selinuxfs.c
--- linux-2.6.13-mm2.o/security/selinux/selinuxfs.c 2005-08-29 00:36:42.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/selinuxfs.c 2005-09-13 10:23:33.000000000 -0400
@@ -424,15 +424,13 @@ static ssize_t sel_write_access(struct f
return length;
length = -ENOMEM;
- scon = kmalloc(size+1, GFP_KERNEL);
+ scon = kzalloc(size+1, GFP_KERNEL);
if (!scon)
return length;
- memset(scon, 0, size+1);
- tcon = kmalloc(size+1, GFP_KERNEL);
+ tcon = kzalloc(size+1, GFP_KERNEL);
if (!tcon)
goto out;
- memset(tcon, 0, size+1);
length = -EINVAL;
if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
@@ -475,15 +473,13 @@ static ssize_t sel_write_create(struct f
return length;
length = -ENOMEM;
- scon = kmalloc(size+1, GFP_KERNEL);
+ scon = kzalloc(size+1, GFP_KERNEL);
if (!scon)
return length;
- memset(scon, 0, size+1);
- tcon = kmalloc(size+1, GFP_KERNEL);
+ tcon = kzalloc(size+1, GFP_KERNEL);
if (!tcon)
goto out;
- memset(tcon, 0, size+1);
length = -EINVAL;
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
@@ -536,15 +532,13 @@ static ssize_t sel_write_relabel(struct
return length;
length = -ENOMEM;
- scon = kmalloc(size+1, GFP_KERNEL);
+ scon = kzalloc(size+1, GFP_KERNEL);
if (!scon)
return length;
- memset(scon, 0, size+1);
- tcon = kmalloc(size+1, GFP_KERNEL);
+ tcon = kzalloc(size+1, GFP_KERNEL);
if (!tcon)
goto out;
- memset(tcon, 0, size+1);
length = -EINVAL;
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
@@ -595,15 +589,13 @@ static ssize_t sel_write_user(struct fil
return length;
length = -ENOMEM;
- con = kmalloc(size+1, GFP_KERNEL);
+ con = kzalloc(size+1, GFP_KERNEL);
if (!con)
return length;
- memset(con, 0, size+1);
- user = kmalloc(size+1, GFP_KERNEL);
+ user = kzalloc(size+1, GFP_KERNEL);
if (!user)
goto out;
- memset(user, 0, size+1);
length = -EINVAL;
if (sscanf(buf, "%s %s", con, user) != 2)
@@ -658,15 +650,13 @@ static ssize_t sel_write_member(struct f
return length;
length = -ENOMEM;
- scon = kmalloc(size+1, GFP_KERNEL);
+ scon = kzalloc(size+1, GFP_KERNEL);
if (!scon)
return length;
- memset(scon, 0, size+1);
- tcon = kmalloc(size+1, GFP_KERNEL);
+ tcon = kzalloc(size+1, GFP_KERNEL);
if (!tcon)
goto out;
- memset(tcon, 0, size+1);
length = -EINVAL;
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/ss/conditional.c linux-2.6.13-mm2.w/security/selinux/ss/conditional.c
--- linux-2.6.13-mm2.o/security/selinux/ss/conditional.c 2005-09-12 11:28:57.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/ss/conditional.c 2005-09-13 10:22:26.000000000 -0400
@@ -220,10 +220,9 @@ int cond_read_bool(struct policydb *p, s
u32 len;
int rc;
- booldatum = kmalloc(sizeof(struct cond_bool_datum), GFP_KERNEL);
+ booldatum = kzalloc(sizeof(struct cond_bool_datum), GFP_KERNEL);
if (!booldatum)
return -1;
- memset(booldatum, 0, sizeof(struct cond_bool_datum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -321,10 +320,9 @@ static int cond_insertf(struct avtab *a,
goto err;
}
- list = kmalloc(sizeof(struct cond_av_list), GFP_KERNEL);
+ list = kzalloc(sizeof(struct cond_av_list), GFP_KERNEL);
if (!list)
goto err;
- memset(list, 0, sizeof(*list));
list->node = node_ptr;
if (!data->head)
@@ -414,11 +412,10 @@ static int cond_read_node(struct policyd
if (rc < 0)
goto err;
- expr = kmalloc(sizeof(struct cond_expr), GFP_KERNEL);
+ expr = kzalloc(sizeof(struct cond_expr), GFP_KERNEL);
if (!expr) {
goto err;
}
- memset(expr, 0, sizeof(struct cond_expr));
expr->expr_type = le32_to_cpu(buf[0]);
expr->bool = le32_to_cpu(buf[1]);
@@ -460,10 +457,9 @@ int cond_read_list(struct policydb *p, v
len = le32_to_cpu(buf[0]);
for (i = 0; i < len; i++) {
- node = kmalloc(sizeof(struct cond_node), GFP_KERNEL);
+ node = kzalloc(sizeof(struct cond_node), GFP_KERNEL);
if (!node)
goto err;
- memset(node, 0, sizeof(struct cond_node));
if (cond_read_node(p, node, fp) != 0)
goto err;
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/ss/ebitmap.c linux-2.6.13-mm2.w/security/selinux/ss/ebitmap.c
--- linux-2.6.13-mm2.o/security/selinux/ss/ebitmap.c 2005-09-12 11:28:57.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/ss/ebitmap.c 2005-09-13 10:16:20.000000000 -0400
@@ -39,12 +39,11 @@ int ebitmap_cpy(struct ebitmap *dst, str
n = src->node;
prev = NULL;
while (n) {
- new = kmalloc(sizeof(*new), GFP_ATOMIC);
+ new = kzalloc(sizeof(*new), GFP_ATOMIC);
if (!new) {
ebitmap_destroy(dst);
return -ENOMEM;
}
- memset(new, 0, sizeof(*new));
new->startbit = n->startbit;
new->map = n->map;
new->next = NULL;
@@ -150,10 +149,9 @@ int ebitmap_set_bit(struct ebitmap *e, u
if (!value)
return 0;
- new = kmalloc(sizeof(*new), GFP_ATOMIC);
+ new = kzalloc(sizeof(*new), GFP_ATOMIC);
if (!new)
return -ENOMEM;
- memset(new, 0, sizeof(*new));
new->startbit = bit & ~(MAPSIZE - 1);
new->map = (MAPBIT << (bit - new->startbit));
@@ -232,13 +230,12 @@ int ebitmap_read(struct ebitmap *e, void
printk(KERN_ERR "security: ebitmap: truncated map\n");
goto bad;
}
- n = kmalloc(sizeof(*n), GFP_KERNEL);
+ n = kzalloc(sizeof(*n), GFP_KERNEL);
if (!n) {
printk(KERN_ERR "security: ebitmap: out of memory\n");
rc = -ENOMEM;
goto bad;
}
- memset(n, 0, sizeof(*n));
n->startbit = le32_to_cpu(buf[0]);
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/ss/hashtab.c linux-2.6.13-mm2.w/security/selinux/ss/hashtab.c
--- linux-2.6.13-mm2.o/security/selinux/ss/hashtab.c 2005-06-19 13:29:33.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/ss/hashtab.c 2005-09-13 10:21:33.000000000 -0400
@@ -15,11 +15,10 @@ struct hashtab *hashtab_create(u32 (*has
struct hashtab *p;
u32 i;
- p = kmalloc(sizeof(*p), GFP_KERNEL);
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
if (p == NULL)
return p;
- memset(p, 0, sizeof(*p));
p->size = size;
p->nel = 0;
p->hash_value = hash_value;
@@ -55,10 +54,9 @@ int hashtab_insert(struct hashtab *h, vo
if (cur && (h->keycmp(h, key, cur->key) == 0))
return -EEXIST;
- newnode = kmalloc(sizeof(*newnode), GFP_KERNEL);
+ newnode = kzalloc(sizeof(*newnode), GFP_KERNEL);
if (newnode == NULL)
return -ENOMEM;
- memset(newnode, 0, sizeof(*newnode));
newnode->key = key;
newnode->datum = datum;
if (prev) {
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/ss/policydb.c linux-2.6.13-mm2.w/security/selinux/ss/policydb.c
--- linux-2.6.13-mm2.o/security/selinux/ss/policydb.c 2005-09-12 11:28:57.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/ss/policydb.c 2005-09-13 10:21:03.000000000 -0400
@@ -121,12 +121,11 @@ static int roles_init(struct policydb *p
int rc;
struct role_datum *role;
- role = kmalloc(sizeof(*role), GFP_KERNEL);
+ role = kzalloc(sizeof(*role), GFP_KERNEL);
if (!role) {
rc = -ENOMEM;
goto out;
}
- memset(role, 0, sizeof(*role));
role->value = ++p->p_roles.nprim;
if (role->value != OBJECT_R_VAL) {
rc = -EINVAL;
@@ -849,12 +848,11 @@ static int perm_read(struct policydb *p,
__le32 buf[2];
u32 len;
- perdatum = kmalloc(sizeof(*perdatum), GFP_KERNEL);
+ perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
if (!perdatum) {
rc = -ENOMEM;
goto out;
}
- memset(perdatum, 0, sizeof(*perdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -891,12 +889,11 @@ static int common_read(struct policydb *
u32 len, nel;
int i, rc;
- comdatum = kmalloc(sizeof(*comdatum), GFP_KERNEL);
+ comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
if (!comdatum) {
rc = -ENOMEM;
goto out;
}
- memset(comdatum, 0, sizeof(*comdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -948,10 +945,9 @@ static int read_cons_helper(struct const
lc = NULL;
for (i = 0; i < ncons; i++) {
- c = kmalloc(sizeof(*c), GFP_KERNEL);
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c)
return -ENOMEM;
- memset(c, 0, sizeof(*c));
if (lc) {
lc->next = c;
@@ -967,10 +963,9 @@ static int read_cons_helper(struct const
le = NULL;
depth = -1;
for (j = 0; j < nexpr; j++) {
- e = kmalloc(sizeof(*e), GFP_KERNEL);
+ e = kzalloc(sizeof(*e), GFP_KERNEL);
if (!e)
return -ENOMEM;
- memset(e, 0, sizeof(*e));
if (le) {
le->next = e;
@@ -1031,12 +1026,11 @@ static int class_read(struct policydb *p
u32 len, len2, ncons, nel;
int i, rc;
- cladatum = kmalloc(sizeof(*cladatum), GFP_KERNEL);
+ cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
if (!cladatum) {
rc = -ENOMEM;
goto out;
}
- memset(cladatum, 0, sizeof(*cladatum));
rc = next_entry(buf, fp, sizeof(u32)*6);
if (rc < 0)
@@ -1125,12 +1119,11 @@ static int role_read(struct policydb *p,
__le32 buf[2];
u32 len;
- role = kmalloc(sizeof(*role), GFP_KERNEL);
+ role = kzalloc(sizeof(*role), GFP_KERNEL);
if (!role) {
rc = -ENOMEM;
goto out;
}
- memset(role, 0, sizeof(*role));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -1186,12 +1179,11 @@ static int type_read(struct policydb *p,
__le32 buf[3];
u32 len;
- typdatum = kmalloc(sizeof(*typdatum),GFP_KERNEL);
+ typdatum = kzalloc(sizeof(*typdatum),GFP_KERNEL);
if (!typdatum) {
rc = -ENOMEM;
return rc;
}
- memset(typdatum, 0, sizeof(*typdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -1259,12 +1251,11 @@ static int user_read(struct policydb *p,
__le32 buf[2];
u32 len;
- usrdatum = kmalloc(sizeof(*usrdatum), GFP_KERNEL);
+ usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
if (!usrdatum) {
rc = -ENOMEM;
goto out;
}
- memset(usrdatum, 0, sizeof(*usrdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -1314,12 +1305,11 @@ static int sens_read(struct policydb *p,
__le32 buf[2];
u32 len;
- levdatum = kmalloc(sizeof(*levdatum), GFP_ATOMIC);
+ levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
if (!levdatum) {
rc = -ENOMEM;
goto out;
}
- memset(levdatum, 0, sizeof(*levdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -1366,12 +1356,11 @@ static int cat_read(struct policydb *p,
__le32 buf[3];
u32 len;
- catdatum = kmalloc(sizeof(*catdatum), GFP_ATOMIC);
+ catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
if (!catdatum) {
rc = -ENOMEM;
goto out;
}
- memset(catdatum, 0, sizeof(*catdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -1565,12 +1554,11 @@ int policydb_read(struct policydb *p, vo
nel = le32_to_cpu(buf[0]);
ltr = NULL;
for (i = 0; i < nel; i++) {
- tr = kmalloc(sizeof(*tr), GFP_KERNEL);
+ tr = kzalloc(sizeof(*tr), GFP_KERNEL);
if (!tr) {
rc = -ENOMEM;
goto bad;
}
- memset(tr, 0, sizeof(*tr));
if (ltr) {
ltr->next = tr;
} else {
@@ -1591,12 +1579,11 @@ int policydb_read(struct policydb *p, vo
nel = le32_to_cpu(buf[0]);
lra = NULL;
for (i = 0; i < nel; i++) {
- ra = kmalloc(sizeof(*ra), GFP_KERNEL);
+ ra = kzalloc(sizeof(*ra), GFP_KERNEL);
if (!ra) {
rc = -ENOMEM;
goto bad;
}
- memset(ra, 0, sizeof(*ra));
if (lra) {
lra->next = ra;
} else {
@@ -1625,12 +1612,11 @@ int policydb_read(struct policydb *p, vo
nel = le32_to_cpu(buf[0]);
l = NULL;
for (j = 0; j < nel; j++) {
- c = kmalloc(sizeof(*c), GFP_KERNEL);
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c) {
rc = -ENOMEM;
goto bad;
}
- memset(c, 0, sizeof(*c));
if (l) {
l->next = c;
} else {
@@ -1741,12 +1727,11 @@ int policydb_read(struct policydb *p, vo
if (rc < 0)
goto bad;
len = le32_to_cpu(buf[0]);
- newgenfs = kmalloc(sizeof(*newgenfs), GFP_KERNEL);
+ newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
if (!newgenfs) {
rc = -ENOMEM;
goto bad;
}
- memset(newgenfs, 0, sizeof(*newgenfs));
newgenfs->fstype = kmalloc(len + 1,GFP_KERNEL);
if (!newgenfs->fstype) {
@@ -1788,12 +1773,11 @@ int policydb_read(struct policydb *p, vo
goto bad;
len = le32_to_cpu(buf[0]);
- newc = kmalloc(sizeof(*newc), GFP_KERNEL);
+ newc = kzalloc(sizeof(*newc), GFP_KERNEL);
if (!newc) {
rc = -ENOMEM;
goto bad;
}
- memset(newc, 0, sizeof(*newc));
newc->u.name = kmalloc(len + 1,GFP_KERNEL);
if (!newc->u.name) {
@@ -1841,12 +1825,11 @@ int policydb_read(struct policydb *p, vo
nel = le32_to_cpu(buf[0]);
lrt = NULL;
for (i = 0; i < nel; i++) {
- rt = kmalloc(sizeof(*rt), GFP_KERNEL);
+ rt = kzalloc(sizeof(*rt), GFP_KERNEL);
if (!rt) {
rc = -ENOMEM;
goto bad;
}
- memset(rt, 0, sizeof(*rt));
if (lrt)
lrt->next = rt;
else
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/ss/services.c linux-2.6.13-mm2.w/security/selinux/ss/services.c
--- linux-2.6.13-mm2.o/security/selinux/ss/services.c 2005-09-12 11:28:57.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/ss/services.c 2005-09-13 10:17:56.000000000 -0400
@@ -1531,12 +1531,11 @@ int security_get_user_sids(u32 fromsid,
}
usercon.user = user->value;
- mysids = kmalloc(maxnel*sizeof(*mysids), GFP_ATOMIC);
+ mysids = kzalloc(maxnel*sizeof(*mysids), GFP_ATOMIC);
if (!mysids) {
rc = -ENOMEM;
goto out_unlock;
}
- memset(mysids, 0, maxnel*sizeof(*mysids));
ebitmap_for_each_bit(&user->roles, rnode, i) {
if (!ebitmap_node_get_bit(rnode, i))
@@ -1566,13 +1565,12 @@ int security_get_user_sids(u32 fromsid,
mysids[mynel++] = sid;
} else {
maxnel += SIDS_NEL;
- mysids2 = kmalloc(maxnel*sizeof(*mysids2), GFP_ATOMIC);
+ mysids2 = kzalloc(maxnel*sizeof(*mysids2), GFP_ATOMIC);
if (!mysids2) {
rc = -ENOMEM;
kfree(mysids);
goto out_unlock;
}
- memset(mysids2, 0, maxnel*sizeof(*mysids2));
memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
kfree(mysids);
mysids = mysids2;
@@ -1714,10 +1712,9 @@ int security_get_bools(int *len, char **
goto out;
}
- *names = (char**)kmalloc(sizeof(char*) * *len, GFP_ATOMIC);
+ *names = (char**)kzalloc(sizeof(char*) * *len, GFP_ATOMIC);
if (!*names)
goto err;
- memset(*names, 0, sizeof(char*) * *len);
*values = (int*)kmalloc(sizeof(int) * *len, GFP_ATOMIC);
if (!*values)
James Morris <[email protected]> wrote:
>
> This patch converts SELinux code from kmalloc/memset to the new kazalloc
> function. On i386, this results in a text saving of over 1K.
>
> Before:
> text data bss dec hex filename
> 86319 4642 15236 106197 19ed5 security/selinux/built-in.o
>
> After:
> text data bss dec hex filename
> 85278 4642 15236 105156 19ac4 security/selinux/built-in.o
>
That's a nice size reduction. If we had kzalloc_gfp_kernel(size_t) we
could drop an argument and save even more, but I suspect Linus would come
after me with a cattle prod.
Note that the use of kzalloc() will nullify kmalloc's compile-time
optimisation where it determines which slab to use at compile time -
kzalloc() won't know the size and will have to do the table search. But
the performance benefit from text size reductions will balance that.
SELinux seems to do a lot of kzalloc(a * b, flags):
+ mysids = kzalloc(maxnel*sizeof(*mysids), GFP_ATOMIC);
+ *names = (char**)kzalloc(sizeof(char*) * *len, GFP_ATOMIC);
+ mysids2 = kzalloc(maxnel*sizeof(*mysids2), GFP_ATOMIC);
Consider using kcalloc() here.
On Tue, 13 Sep 2005, Andrew Morton wrote:
> SELinux seems to do a lot of kzalloc(a * b, flags):
>
> + mysids = kzalloc(maxnel*sizeof(*mysids), GFP_ATOMIC);
> + *names = (char**)kzalloc(sizeof(char*) * *len, GFP_ATOMIC);
> + mysids2 = kzalloc(maxnel*sizeof(*mysids2), GFP_ATOMIC);
>
> Consider using kcalloc() here.
Ok, updated patch below (found four of them).
Signed-off-by: James Morris <[email protected]>
---
security/selinux/hooks.c | 24 +++++------------
security/selinux/netif.c | 3 --
security/selinux/selinuxfs.c | 30 +++++++---------------
security/selinux/ss/conditional.c | 12 ++------
security/selinux/ss/ebitmap.c | 9 ++----
security/selinux/ss/hashtab.c | 6 +---
security/selinux/ss/policydb.c | 51 ++++++++++++--------------------------
security/selinux/ss/services.c | 11 ++------
8 files changed, 49 insertions(+), 97 deletions(-)
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/hooks.c linux-2.6.13-mm2.w/security/selinux/hooks.c
--- linux-2.6.13-mm2.o/security/selinux/hooks.c 2005-09-12 11:28:57.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/hooks.c 2005-09-13 16:23:44.000000000 -0400
@@ -122,11 +122,10 @@ static int task_alloc_security(struct ta
{
struct task_security_struct *tsec;
- tsec = kmalloc(sizeof(struct task_security_struct), GFP_KERNEL);
+ tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
if (!tsec)
return -ENOMEM;
- memset(tsec, 0, sizeof(struct task_security_struct));
tsec->magic = SELINUX_MAGIC;
tsec->task = task;
tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED;
@@ -151,11 +150,10 @@ static int inode_alloc_security(struct i
struct task_security_struct *tsec = current->security;
struct inode_security_struct *isec;
- isec = kmalloc(sizeof(struct inode_security_struct), GFP_KERNEL);
+ isec = kzalloc(sizeof(struct inode_security_struct), GFP_KERNEL);
if (!isec)
return -ENOMEM;
- memset(isec, 0, sizeof(struct inode_security_struct));
init_MUTEX(&isec->sem);
INIT_LIST_HEAD(&isec->list);
isec->magic = SELINUX_MAGIC;
@@ -193,11 +191,10 @@ static int file_alloc_security(struct fi
struct task_security_struct *tsec = current->security;
struct file_security_struct *fsec;
- fsec = kmalloc(sizeof(struct file_security_struct), GFP_ATOMIC);
+ fsec = kzalloc(sizeof(struct file_security_struct), GFP_ATOMIC);
if (!fsec)
return -ENOMEM;
- memset(fsec, 0, sizeof(struct file_security_struct));
fsec->magic = SELINUX_MAGIC;
fsec->file = file;
if (tsec && tsec->magic == SELINUX_MAGIC) {
@@ -227,11 +224,10 @@ static int superblock_alloc_security(str
{
struct superblock_security_struct *sbsec;
- sbsec = kmalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
+ sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
if (!sbsec)
return -ENOMEM;
- memset(sbsec, 0, sizeof(struct superblock_security_struct));
init_MUTEX(&sbsec->sem);
INIT_LIST_HEAD(&sbsec->list);
INIT_LIST_HEAD(&sbsec->isec_head);
@@ -269,11 +265,10 @@ static int sk_alloc_security(struct sock
if (family != PF_UNIX)
return 0;
- ssec = kmalloc(sizeof(*ssec), priority);
+ ssec = kzalloc(sizeof(*ssec), priority);
if (!ssec)
return -ENOMEM;
- memset(ssec, 0, sizeof(*ssec));
ssec->magic = SELINUX_MAGIC;
ssec->sk = sk;
ssec->peer_sid = SECINITSID_UNLABELED;
@@ -1467,11 +1462,10 @@ static int selinux_bprm_alloc_security(s
{
struct bprm_security_struct *bsec;
- bsec = kmalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
+ bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
if (!bsec)
return -ENOMEM;
- memset(bsec, 0, sizeof *bsec);
bsec->magic = SELINUX_MAGIC;
bsec->bprm = bprm;
bsec->sid = SECINITSID_UNLABELED;
@@ -3581,11 +3575,10 @@ static int ipc_alloc_security(struct tas
struct task_security_struct *tsec = task->security;
struct ipc_security_struct *isec;
- isec = kmalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
+ isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
if (!isec)
return -ENOMEM;
- memset(isec, 0, sizeof(struct ipc_security_struct));
isec->magic = SELINUX_MAGIC;
isec->sclass = sclass;
isec->ipc_perm = perm;
@@ -3613,11 +3606,10 @@ static int msg_msg_alloc_security(struct
{
struct msg_security_struct *msec;
- msec = kmalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
+ msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
if (!msec)
return -ENOMEM;
- memset(msec, 0, sizeof(struct msg_security_struct));
msec->magic = SELINUX_MAGIC;
msec->msg = msg;
msec->sid = SECINITSID_UNLABELED;
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/netif.c linux-2.6.13-mm2.w/security/selinux/netif.c
--- linux-2.6.13-mm2.o/security/selinux/netif.c 2005-03-02 02:38:09.000000000 -0500
+++ linux-2.6.13-mm2.w/security/selinux/netif.c 2005-09-13 16:23:44.000000000 -0400
@@ -114,13 +114,12 @@ static struct sel_netif *sel_netif_looku
if (likely(netif != NULL))
goto out;
- new = kmalloc(sizeof(*new), GFP_ATOMIC);
+ new = kzalloc(sizeof(*new), GFP_ATOMIC);
if (!new) {
netif = ERR_PTR(-ENOMEM);
goto out;
}
- memset(new, 0, sizeof(*new));
nsec = &new->nsec;
ret = security_netif_sid(dev->name, &nsec->if_sid, &nsec->msg_sid);
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/selinuxfs.c linux-2.6.13-mm2.w/security/selinux/selinuxfs.c
--- linux-2.6.13-mm2.o/security/selinux/selinuxfs.c 2005-08-29 00:36:42.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/selinuxfs.c 2005-09-13 16:23:44.000000000 -0400
@@ -424,15 +424,13 @@ static ssize_t sel_write_access(struct f
return length;
length = -ENOMEM;
- scon = kmalloc(size+1, GFP_KERNEL);
+ scon = kzalloc(size+1, GFP_KERNEL);
if (!scon)
return length;
- memset(scon, 0, size+1);
- tcon = kmalloc(size+1, GFP_KERNEL);
+ tcon = kzalloc(size+1, GFP_KERNEL);
if (!tcon)
goto out;
- memset(tcon, 0, size+1);
length = -EINVAL;
if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
@@ -475,15 +473,13 @@ static ssize_t sel_write_create(struct f
return length;
length = -ENOMEM;
- scon = kmalloc(size+1, GFP_KERNEL);
+ scon = kzalloc(size+1, GFP_KERNEL);
if (!scon)
return length;
- memset(scon, 0, size+1);
- tcon = kmalloc(size+1, GFP_KERNEL);
+ tcon = kzalloc(size+1, GFP_KERNEL);
if (!tcon)
goto out;
- memset(tcon, 0, size+1);
length = -EINVAL;
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
@@ -536,15 +532,13 @@ static ssize_t sel_write_relabel(struct
return length;
length = -ENOMEM;
- scon = kmalloc(size+1, GFP_KERNEL);
+ scon = kzalloc(size+1, GFP_KERNEL);
if (!scon)
return length;
- memset(scon, 0, size+1);
- tcon = kmalloc(size+1, GFP_KERNEL);
+ tcon = kzalloc(size+1, GFP_KERNEL);
if (!tcon)
goto out;
- memset(tcon, 0, size+1);
length = -EINVAL;
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
@@ -595,15 +589,13 @@ static ssize_t sel_write_user(struct fil
return length;
length = -ENOMEM;
- con = kmalloc(size+1, GFP_KERNEL);
+ con = kzalloc(size+1, GFP_KERNEL);
if (!con)
return length;
- memset(con, 0, size+1);
- user = kmalloc(size+1, GFP_KERNEL);
+ user = kzalloc(size+1, GFP_KERNEL);
if (!user)
goto out;
- memset(user, 0, size+1);
length = -EINVAL;
if (sscanf(buf, "%s %s", con, user) != 2)
@@ -658,15 +650,13 @@ static ssize_t sel_write_member(struct f
return length;
length = -ENOMEM;
- scon = kmalloc(size+1, GFP_KERNEL);
+ scon = kzalloc(size+1, GFP_KERNEL);
if (!scon)
return length;
- memset(scon, 0, size+1);
- tcon = kmalloc(size+1, GFP_KERNEL);
+ tcon = kzalloc(size+1, GFP_KERNEL);
if (!tcon)
goto out;
- memset(tcon, 0, size+1);
length = -EINVAL;
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/ss/conditional.c linux-2.6.13-mm2.w/security/selinux/ss/conditional.c
--- linux-2.6.13-mm2.o/security/selinux/ss/conditional.c 2005-09-12 11:28:57.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/ss/conditional.c 2005-09-13 16:23:44.000000000 -0400
@@ -220,10 +220,9 @@ int cond_read_bool(struct policydb *p, s
u32 len;
int rc;
- booldatum = kmalloc(sizeof(struct cond_bool_datum), GFP_KERNEL);
+ booldatum = kzalloc(sizeof(struct cond_bool_datum), GFP_KERNEL);
if (!booldatum)
return -1;
- memset(booldatum, 0, sizeof(struct cond_bool_datum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -321,10 +320,9 @@ static int cond_insertf(struct avtab *a,
goto err;
}
- list = kmalloc(sizeof(struct cond_av_list), GFP_KERNEL);
+ list = kzalloc(sizeof(struct cond_av_list), GFP_KERNEL);
if (!list)
goto err;
- memset(list, 0, sizeof(*list));
list->node = node_ptr;
if (!data->head)
@@ -414,11 +412,10 @@ static int cond_read_node(struct policyd
if (rc < 0)
goto err;
- expr = kmalloc(sizeof(struct cond_expr), GFP_KERNEL);
+ expr = kzalloc(sizeof(struct cond_expr), GFP_KERNEL);
if (!expr) {
goto err;
}
- memset(expr, 0, sizeof(struct cond_expr));
expr->expr_type = le32_to_cpu(buf[0]);
expr->bool = le32_to_cpu(buf[1]);
@@ -460,10 +457,9 @@ int cond_read_list(struct policydb *p, v
len = le32_to_cpu(buf[0]);
for (i = 0; i < len; i++) {
- node = kmalloc(sizeof(struct cond_node), GFP_KERNEL);
+ node = kzalloc(sizeof(struct cond_node), GFP_KERNEL);
if (!node)
goto err;
- memset(node, 0, sizeof(struct cond_node));
if (cond_read_node(p, node, fp) != 0)
goto err;
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/ss/ebitmap.c linux-2.6.13-mm2.w/security/selinux/ss/ebitmap.c
--- linux-2.6.13-mm2.o/security/selinux/ss/ebitmap.c 2005-09-12 11:28:57.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/ss/ebitmap.c 2005-09-13 16:23:44.000000000 -0400
@@ -39,12 +39,11 @@ int ebitmap_cpy(struct ebitmap *dst, str
n = src->node;
prev = NULL;
while (n) {
- new = kmalloc(sizeof(*new), GFP_ATOMIC);
+ new = kzalloc(sizeof(*new), GFP_ATOMIC);
if (!new) {
ebitmap_destroy(dst);
return -ENOMEM;
}
- memset(new, 0, sizeof(*new));
new->startbit = n->startbit;
new->map = n->map;
new->next = NULL;
@@ -150,10 +149,9 @@ int ebitmap_set_bit(struct ebitmap *e, u
if (!value)
return 0;
- new = kmalloc(sizeof(*new), GFP_ATOMIC);
+ new = kzalloc(sizeof(*new), GFP_ATOMIC);
if (!new)
return -ENOMEM;
- memset(new, 0, sizeof(*new));
new->startbit = bit & ~(MAPSIZE - 1);
new->map = (MAPBIT << (bit - new->startbit));
@@ -232,13 +230,12 @@ int ebitmap_read(struct ebitmap *e, void
printk(KERN_ERR "security: ebitmap: truncated map\n");
goto bad;
}
- n = kmalloc(sizeof(*n), GFP_KERNEL);
+ n = kzalloc(sizeof(*n), GFP_KERNEL);
if (!n) {
printk(KERN_ERR "security: ebitmap: out of memory\n");
rc = -ENOMEM;
goto bad;
}
- memset(n, 0, sizeof(*n));
n->startbit = le32_to_cpu(buf[0]);
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/ss/hashtab.c linux-2.6.13-mm2.w/security/selinux/ss/hashtab.c
--- linux-2.6.13-mm2.o/security/selinux/ss/hashtab.c 2005-06-19 13:29:33.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/ss/hashtab.c 2005-09-13 16:23:44.000000000 -0400
@@ -15,11 +15,10 @@ struct hashtab *hashtab_create(u32 (*has
struct hashtab *p;
u32 i;
- p = kmalloc(sizeof(*p), GFP_KERNEL);
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
if (p == NULL)
return p;
- memset(p, 0, sizeof(*p));
p->size = size;
p->nel = 0;
p->hash_value = hash_value;
@@ -55,10 +54,9 @@ int hashtab_insert(struct hashtab *h, vo
if (cur && (h->keycmp(h, key, cur->key) == 0))
return -EEXIST;
- newnode = kmalloc(sizeof(*newnode), GFP_KERNEL);
+ newnode = kzalloc(sizeof(*newnode), GFP_KERNEL);
if (newnode == NULL)
return -ENOMEM;
- memset(newnode, 0, sizeof(*newnode));
newnode->key = key;
newnode->datum = datum;
if (prev) {
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/ss/policydb.c linux-2.6.13-mm2.w/security/selinux/ss/policydb.c
--- linux-2.6.13-mm2.o/security/selinux/ss/policydb.c 2005-09-12 11:28:57.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/ss/policydb.c 2005-09-13 16:23:44.000000000 -0400
@@ -121,12 +121,11 @@ static int roles_init(struct policydb *p
int rc;
struct role_datum *role;
- role = kmalloc(sizeof(*role), GFP_KERNEL);
+ role = kzalloc(sizeof(*role), GFP_KERNEL);
if (!role) {
rc = -ENOMEM;
goto out;
}
- memset(role, 0, sizeof(*role));
role->value = ++p->p_roles.nprim;
if (role->value != OBJECT_R_VAL) {
rc = -EINVAL;
@@ -849,12 +848,11 @@ static int perm_read(struct policydb *p,
__le32 buf[2];
u32 len;
- perdatum = kmalloc(sizeof(*perdatum), GFP_KERNEL);
+ perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
if (!perdatum) {
rc = -ENOMEM;
goto out;
}
- memset(perdatum, 0, sizeof(*perdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -891,12 +889,11 @@ static int common_read(struct policydb *
u32 len, nel;
int i, rc;
- comdatum = kmalloc(sizeof(*comdatum), GFP_KERNEL);
+ comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
if (!comdatum) {
rc = -ENOMEM;
goto out;
}
- memset(comdatum, 0, sizeof(*comdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -948,10 +945,9 @@ static int read_cons_helper(struct const
lc = NULL;
for (i = 0; i < ncons; i++) {
- c = kmalloc(sizeof(*c), GFP_KERNEL);
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c)
return -ENOMEM;
- memset(c, 0, sizeof(*c));
if (lc) {
lc->next = c;
@@ -967,10 +963,9 @@ static int read_cons_helper(struct const
le = NULL;
depth = -1;
for (j = 0; j < nexpr; j++) {
- e = kmalloc(sizeof(*e), GFP_KERNEL);
+ e = kzalloc(sizeof(*e), GFP_KERNEL);
if (!e)
return -ENOMEM;
- memset(e, 0, sizeof(*e));
if (le) {
le->next = e;
@@ -1031,12 +1026,11 @@ static int class_read(struct policydb *p
u32 len, len2, ncons, nel;
int i, rc;
- cladatum = kmalloc(sizeof(*cladatum), GFP_KERNEL);
+ cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
if (!cladatum) {
rc = -ENOMEM;
goto out;
}
- memset(cladatum, 0, sizeof(*cladatum));
rc = next_entry(buf, fp, sizeof(u32)*6);
if (rc < 0)
@@ -1125,12 +1119,11 @@ static int role_read(struct policydb *p,
__le32 buf[2];
u32 len;
- role = kmalloc(sizeof(*role), GFP_KERNEL);
+ role = kzalloc(sizeof(*role), GFP_KERNEL);
if (!role) {
rc = -ENOMEM;
goto out;
}
- memset(role, 0, sizeof(*role));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -1186,12 +1179,11 @@ static int type_read(struct policydb *p,
__le32 buf[3];
u32 len;
- typdatum = kmalloc(sizeof(*typdatum),GFP_KERNEL);
+ typdatum = kzalloc(sizeof(*typdatum),GFP_KERNEL);
if (!typdatum) {
rc = -ENOMEM;
return rc;
}
- memset(typdatum, 0, sizeof(*typdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -1259,12 +1251,11 @@ static int user_read(struct policydb *p,
__le32 buf[2];
u32 len;
- usrdatum = kmalloc(sizeof(*usrdatum), GFP_KERNEL);
+ usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
if (!usrdatum) {
rc = -ENOMEM;
goto out;
}
- memset(usrdatum, 0, sizeof(*usrdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -1314,12 +1305,11 @@ static int sens_read(struct policydb *p,
__le32 buf[2];
u32 len;
- levdatum = kmalloc(sizeof(*levdatum), GFP_ATOMIC);
+ levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
if (!levdatum) {
rc = -ENOMEM;
goto out;
}
- memset(levdatum, 0, sizeof(*levdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -1366,12 +1356,11 @@ static int cat_read(struct policydb *p,
__le32 buf[3];
u32 len;
- catdatum = kmalloc(sizeof(*catdatum), GFP_ATOMIC);
+ catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
if (!catdatum) {
rc = -ENOMEM;
goto out;
}
- memset(catdatum, 0, sizeof(*catdatum));
rc = next_entry(buf, fp, sizeof buf);
if (rc < 0)
@@ -1565,12 +1554,11 @@ int policydb_read(struct policydb *p, vo
nel = le32_to_cpu(buf[0]);
ltr = NULL;
for (i = 0; i < nel; i++) {
- tr = kmalloc(sizeof(*tr), GFP_KERNEL);
+ tr = kzalloc(sizeof(*tr), GFP_KERNEL);
if (!tr) {
rc = -ENOMEM;
goto bad;
}
- memset(tr, 0, sizeof(*tr));
if (ltr) {
ltr->next = tr;
} else {
@@ -1591,12 +1579,11 @@ int policydb_read(struct policydb *p, vo
nel = le32_to_cpu(buf[0]);
lra = NULL;
for (i = 0; i < nel; i++) {
- ra = kmalloc(sizeof(*ra), GFP_KERNEL);
+ ra = kzalloc(sizeof(*ra), GFP_KERNEL);
if (!ra) {
rc = -ENOMEM;
goto bad;
}
- memset(ra, 0, sizeof(*ra));
if (lra) {
lra->next = ra;
} else {
@@ -1625,12 +1612,11 @@ int policydb_read(struct policydb *p, vo
nel = le32_to_cpu(buf[0]);
l = NULL;
for (j = 0; j < nel; j++) {
- c = kmalloc(sizeof(*c), GFP_KERNEL);
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c) {
rc = -ENOMEM;
goto bad;
}
- memset(c, 0, sizeof(*c));
if (l) {
l->next = c;
} else {
@@ -1741,12 +1727,11 @@ int policydb_read(struct policydb *p, vo
if (rc < 0)
goto bad;
len = le32_to_cpu(buf[0]);
- newgenfs = kmalloc(sizeof(*newgenfs), GFP_KERNEL);
+ newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
if (!newgenfs) {
rc = -ENOMEM;
goto bad;
}
- memset(newgenfs, 0, sizeof(*newgenfs));
newgenfs->fstype = kmalloc(len + 1,GFP_KERNEL);
if (!newgenfs->fstype) {
@@ -1788,12 +1773,11 @@ int policydb_read(struct policydb *p, vo
goto bad;
len = le32_to_cpu(buf[0]);
- newc = kmalloc(sizeof(*newc), GFP_KERNEL);
+ newc = kzalloc(sizeof(*newc), GFP_KERNEL);
if (!newc) {
rc = -ENOMEM;
goto bad;
}
- memset(newc, 0, sizeof(*newc));
newc->u.name = kmalloc(len + 1,GFP_KERNEL);
if (!newc->u.name) {
@@ -1841,12 +1825,11 @@ int policydb_read(struct policydb *p, vo
nel = le32_to_cpu(buf[0]);
lrt = NULL;
for (i = 0; i < nel; i++) {
- rt = kmalloc(sizeof(*rt), GFP_KERNEL);
+ rt = kzalloc(sizeof(*rt), GFP_KERNEL);
if (!rt) {
rc = -ENOMEM;
goto bad;
}
- memset(rt, 0, sizeof(*rt));
if (lrt)
lrt->next = rt;
else
diff -purN -X dontdiff linux-2.6.13-mm2.o/security/selinux/ss/services.c linux-2.6.13-mm2.w/security/selinux/ss/services.c
--- linux-2.6.13-mm2.o/security/selinux/ss/services.c 2005-09-12 11:28:57.000000000 -0400
+++ linux-2.6.13-mm2.w/security/selinux/ss/services.c 2005-09-13 16:26:11.000000000 -0400
@@ -1531,12 +1531,11 @@ int security_get_user_sids(u32 fromsid,
}
usercon.user = user->value;
- mysids = kmalloc(maxnel*sizeof(*mysids), GFP_ATOMIC);
+ mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC);
if (!mysids) {
rc = -ENOMEM;
goto out_unlock;
}
- memset(mysids, 0, maxnel*sizeof(*mysids));
ebitmap_for_each_bit(&user->roles, rnode, i) {
if (!ebitmap_node_get_bit(rnode, i))
@@ -1566,13 +1565,12 @@ int security_get_user_sids(u32 fromsid,
mysids[mynel++] = sid;
} else {
maxnel += SIDS_NEL;
- mysids2 = kmalloc(maxnel*sizeof(*mysids2), GFP_ATOMIC);
+ mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC);
if (!mysids2) {
rc = -ENOMEM;
kfree(mysids);
goto out_unlock;
}
- memset(mysids2, 0, maxnel*sizeof(*mysids2));
memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
kfree(mysids);
mysids = mysids2;
@@ -1714,12 +1712,11 @@ int security_get_bools(int *len, char **
goto out;
}
- *names = (char**)kmalloc(sizeof(char*) * *len, GFP_ATOMIC);
+ *names = (char**)kcalloc(*len, sizeof(char*), GFP_ATOMIC);
if (!*names)
goto err;
- memset(*names, 0, sizeof(char*) * *len);
- *values = (int*)kmalloc(sizeof(int) * *len, GFP_ATOMIC);
+ *values = (int*)kcalloc(*len, sizeof(int), GFP_ATOMIC);
if (!*values)
goto err;
Andrew> That's a nice size reduction. If we had
Andrew> kzalloc_gfp_kernel(size_t) we could drop an argument and
Andrew> save even more, but I suspect Linus would come after me
Andrew> with a cattle prod.
Could one make kzalloc() an inline and do some __builtin_constant_p()
trickery on the flags parameter to get the same effect?
I'll give it a try and see what happens.
- R.
On Tuesday 13 September 2005 18:18, James Morris wrote:
> -???????*names = (char**)kmalloc(sizeof(char*) * *len, GFP_ATOMIC);
> +???????*names = (char**)kzalloc(sizeof(char*) * *len, GFP_ATOMIC);
Extra cast
--
vda
Andrew, it turns out that your idea of kzalloc_gfp_kernel() does save
a bit. Here's a patch that shouldn't even make Linus look for a
cattle prod.
[BTW, it's rather amusing watching ld use a gig of memory and several
minutes of CPU time as it strains to link an allyesconfig kernel]
- R.
Here's a patch to get the effect of having kzalloc_gfp_kernel()
without affecting any callers. It makes kzalloc() an inline that just
calls __kzalloc_gfp_kernel() if the flags parameter is a compile-time
constant and is GFP_KERNEL, and calls __kzalloc() otherwise.
On an x86_64 allyesconfig kernel, I see the following size:
text data bss dec hex filename
24202272 7609162 1998512 33809946 203e61a ../kbuild-before/vmlinux
24201601 7609266 1998512 33809379 203e3e3 ../kbuild-after/vmlinux
for a net savings of 671 bytes of text (at a cost of 104 bytes of data
for some reason). As use of kzalloc() becomes more widespread, this
should get even better.
Signed-off-by: Roland Dreier <[email protected]>
diff --git a/include/linux/slab.h b/include/linux/slab.h
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -99,7 +99,16 @@ found:
return __kmalloc(size, flags);
}
-extern void *kzalloc(size_t, unsigned int __nocast);
+extern void *__kzalloc(size_t, unsigned int __nocast);
+extern void *__kzalloc_gfp_kernel(size_t);
+
+static inline void *kzalloc(size_t size, unsigned int __nocast flags)
+{
+ if (__builtin_constant_p(flags) && flags == GFP_KERNEL)
+ return __kzalloc_gfp_kernel(size);
+ else
+ return __kzalloc(size, flags);
+}
/**
* kcalloc - allocate memory for an array. The memory is set to zero.
diff --git a/mm/slab.c b/mm/slab.c
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2985,14 +2985,20 @@ EXPORT_SYMBOL(kmem_cache_free);
* @size: how many bytes of memory are required.
* @flags: the type of memory to allocate.
*/
-void *kzalloc(size_t size, unsigned int __nocast flags)
+void *__kzalloc(size_t size, unsigned int __nocast flags)
{
void *ret = kmalloc(size, flags);
if (ret)
memset(ret, 0, size);
return ret;
}
-EXPORT_SYMBOL(kzalloc);
+EXPORT_SYMBOL(__kzalloc);
+
+void *__kzalloc_gfp_kernel(size_t size)
+{
+ return __kzalloc(size, GFP_KERNEL);
+}
+EXPORT_SYMBOL(__kzalloc_gfp_kernel);
/**
* kfree - free previously allocated memory
Roland Dreier <[email protected]> wrote:
>
> On an x86_64 allyesconfig kernel, I see the following size:
>
> text data bss dec hex filename
> 24202272 7609162 1998512 33809946 203e61a ../kbuild-before/vmlinux
> 24201601 7609266 1998512 33809379 203e3e3 ../kbuild-after/vmlinux
>
It hardly seems worth it, really. Better savings would come from doing the
same trick to kmem_cache_alloc() then tweaking kmalloc().
There are probably any number of frequently-called functions which we could
hack around with..
Andrew> It hardly seems worth it, really. Better savings would
Andrew> come from doing the same trick to kmem_cache_alloc() then
Andrew> tweaking kmalloc().
Yep, right as usual; here's an updated patch. Do with it as you will --
I won't be hurt if you dump it, since I had fun trying this out.
Reduce kernel text by moving many uses of GFP_KERNEL out of line, by
creating __kmem_cache_alloc_gfp_kernel(), __kmalloc_gfp_kernel() and
__kzalloc_gfp_kernel() wrapper functions. Then kmem_cache_alloc(),
kmalloc() and kzalloc() can be inline functions that just call their
_gfp_kernel version if their flags parameter is a compile-time
constant and is GFP_KERNEL, and call their ordinary version otherwise.
On an x86_64 allyesconfig kernel, I see the following sizes:
text data bss dec hex filename
24202272 7609162 1998512 33809946 203e61a vmlinux-before
24197561 7609474 1998512 33805547 203d4eb vmlinux-after
for a net savings of 4711 bytes of text (at a cost of 312 bytes of
data for some reason). With my usual config, the patched kernel boots
and runs fine.
Signed-off-by: Roland Dreier <[email protected]>
diff --git a/include/linux/slab.h b/include/linux/slab.h
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -61,7 +61,8 @@ extern kmem_cache_t *kmem_cache_create(c
void (*)(void *, kmem_cache_t *, unsigned long));
extern int kmem_cache_destroy(kmem_cache_t *);
extern int kmem_cache_shrink(kmem_cache_t *);
-extern void *kmem_cache_alloc(kmem_cache_t *, unsigned int __nocast);
+extern void *__kmem_cache_alloc(kmem_cache_t *, unsigned int __nocast);
+extern void *__kmem_cache_alloc_gfp_kernel(kmem_cache_t *);
extern void kmem_cache_free(kmem_cache_t *, void *);
extern unsigned int kmem_cache_size(kmem_cache_t *);
extern const char *kmem_cache_name(kmem_cache_t *);
@@ -75,6 +76,15 @@ struct cache_sizes {
};
extern struct cache_sizes malloc_sizes[];
extern void *__kmalloc(size_t, unsigned int __nocast);
+extern void *__kmalloc_gfp_kernel(size_t);
+
+static inline void *kmem_cache_alloc(kmem_cache_t *cache, unsigned int __nocast flags)
+{
+ if (__builtin_constant_p(flags) && flags == GFP_KERNEL)
+ return __kmem_cache_alloc_gfp_kernel(cache);
+
+ return __kmem_cache_alloc(cache, flags);
+}
static inline void *kmalloc(size_t size, unsigned int __nocast flags)
{
@@ -96,10 +106,22 @@ found:
malloc_sizes[i].cs_dmacachep :
malloc_sizes[i].cs_cachep, flags);
}
+
+ if (__builtin_constant_p(flags) && flags == GFP_KERNEL)
+ return __kmalloc_gfp_kernel(size);
return __kmalloc(size, flags);
}
-extern void *kzalloc(size_t, unsigned int __nocast);
+extern void *__kzalloc(size_t, unsigned int __nocast);
+extern void *__kzalloc_gfp_kernel(size_t);
+
+static inline void *kzalloc(size_t size, unsigned int __nocast flags)
+{
+ if (__builtin_constant_p(flags) && flags == GFP_KERNEL)
+ return __kzalloc_gfp_kernel(size);
+
+ return __kzalloc(size, flags);
+}
/**
* kcalloc - allocate memory for an array. The memory is set to zero.
diff --git a/mm/slab.c b/mm/slab.c
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2778,11 +2778,17 @@ static inline void __cache_free(kmem_cac
* Allocate an object from this cache. The flags are only relevant
* if the cache has no available objects.
*/
-void *kmem_cache_alloc(kmem_cache_t *cachep, unsigned int __nocast flags)
+void *__kmem_cache_alloc(kmem_cache_t *cachep, unsigned int __nocast flags)
{
return __cache_alloc(cachep, flags);
}
-EXPORT_SYMBOL(kmem_cache_alloc);
+EXPORT_SYMBOL(__kmem_cache_alloc);
+
+void *__kmem_cache_alloc_gfp_kernel(kmem_cache_t *cachep)
+{
+ return __cache_alloc(cachep, GFP_KERNEL);
+}
+EXPORT_SYMBOL(__kmem_cache_alloc_gfp_kernel);
/**
* kmem_ptr_validate - check if an untrusted pointer might
@@ -2912,6 +2918,12 @@ void *__kmalloc(size_t size, unsigned in
}
EXPORT_SYMBOL(__kmalloc);
+void *__kmalloc_gfp_kernel(size_t size)
+{
+ return __kmalloc(size, GFP_KERNEL);
+}
+EXPORT_SYMBOL(__kmalloc_gfp_kernel);
+
#ifdef CONFIG_SMP
/**
* __alloc_percpu - allocate one copy of the object for every present
@@ -2985,14 +2997,20 @@ EXPORT_SYMBOL(kmem_cache_free);
* @size: how many bytes of memory are required.
* @flags: the type of memory to allocate.
*/
-void *kzalloc(size_t size, unsigned int __nocast flags)
+void *__kzalloc(size_t size, unsigned int __nocast flags)
{
void *ret = kmalloc(size, flags);
if (ret)
memset(ret, 0, size);
return ret;
}
-EXPORT_SYMBOL(kzalloc);
+EXPORT_SYMBOL(__kzalloc);
+
+void *__kzalloc_gfp_kernel(size_t size)
+{
+ return __kzalloc(size, GFP_KERNEL);
+}
+EXPORT_SYMBOL(__kzalloc_gfp_kernel);
/**
* kfree - free previously allocated memory
On Wednesday 14 September 2005 21:39, Roland Dreier wrote:
> text data bss dec hex filename
> 24202272 7609162 1998512 33809946 203e61a vmlinux-before
> 24197561 7609474 1998512 33805547 203d4eb vmlinux-after
>
> for a net savings of 4711 bytes of text (at a cost of 312 bytes of
> data for some reason). With my usual config, the patched kernel boots
> and runs fine.
FYI: "some reason" == KALLSYMS
--
vda
Denis Vlasenko wrote:
> On Wednesday 14 September 2005 21:39, Roland Dreier wrote:
>
>> text data bss dec hex filename
>> 24202272 7609162 1998512 33809946 203e61a vmlinux-before
>> 24197561 7609474 1998512 33805547 203d4eb vmlinux-after
>>
>>for a net savings of 4711 bytes of text (at a cost of 312 bytes of
>>data for some reason). With my usual config, the patched kernel boots
>>and runs fine.
>
> FYI: "some reason" == KALLSYMS
312 bytes for a couple more symbols is too much to be justified from
kallsyms alone.
In a 64 bit machine each new symbol should take about 8 bytes for the
address + ~ half the size of the symbol name, which in this case would
give at most about ~50 bytes.
I guess the rest should come from the extra EXPORT_SYMBOL's...
--
Paulo Marques - http://www.grupopie.com
The rule is perfect: in all matters of opinion our
adversaries are insane.
Mark Twain