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smack: get rid of match_token() 

same issue as with selinux...

[fix by Andrei Vagin folded in]

Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-12-16 01:52:24 -05:00
parent 55c0e5bd07
commit c3300aaf95
1 changed files with 38 additions and 18 deletions
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56
security/smack/smack_lsm.c
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@ -59,14 +59,31 @@ static LIST_HEAD(smk_ipv6_port_list);
static struct kmem_cache *smack_inode_cache;
int smack_enabled;
static const match_table_t smk_mount_tokens = {
{Opt_fsdefault, SMK_FSDEFAULT "%s"},
{Opt_fsfloor, SMK_FSFLOOR "%s"},
{Opt_fshat, SMK_FSHAT "%s"},
{Opt_fsroot, SMK_FSROOT "%s"},
{Opt_fstransmute, SMK_FSTRANS "%s"},
{Opt_error, NULL},
#define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s}
static struct {
const char *name;
int len;
int opt;
} smk_mount_opts[] = {
A(fsdefault), A(fsfloor), A(fshat), A(fsroot), A(fstransmute)
};
#undef A
static int match_opt_prefix(char *s, int l, char **arg)
{
int i;
for (i = 0; i < ARRAY_SIZE(smk_mount_opts); i++) {
size_t len = smk_mount_opts[i].len;
if (len > l || memcmp(s, smk_mount_opts[i].name, len))
continue;
if (len == l || s[len] != '=')
continue;
*arg = s + len + 1;
return smk_mount_opts[i].opt;
}
return Opt_error;
}
#ifdef CONFIG_SECURITY_SMACK_BRINGUP
static char *smk_bu_mess[] = {
@ -689,23 +706,23 @@ out_opt_err:
static int smack_parse_opts_str(char *options,
void **mnt_opts)
{
char *p;
int rc = -ENOMEM;
int token;
char *from = options;
if (!options)
return 0;
while ((p = strsep(&options, ",")) != NULL) {
substring_t args[MAX_OPT_ARGS];
const char *arg;
while (1) {
char *next = strchr(from, ',');
int token, len, rc;
char *arg = NULL;
if (!*p)
continue;
if (next)
len = next - from;
else
len = strlen(from);
token = match_token(p, smk_mount_tokens, args);
arg = match_strdup(&args[0]);
token = match_opt_prefix(from, len, &arg);
arg = kmemdup_nul(arg, from + len - arg, GFP_KERNEL);
rc = smack_add_opt(token, arg, mnt_opts);
if (unlikely(rc)) {
kfree(arg);
@ -714,6 +731,9 @@ static int smack_parse_opts_str(char *options,
*mnt_opts = NULL;
return rc;
}
if (!from[len])
break;
from += len + 1;
}
return 0;
}