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apparmor: support v7 transition format compatible with label_parse

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Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2017-06-09 17:29:12 -07:00
parent 064dc9472f
commit 5379a33120
2 changed files with 15 additions and 7 deletions
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2
security/apparmor/apparmorfs.c
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@ -2103,6 +2103,8 @@ static struct aa_sfs_entry aa_sfs_entry_domain[] = {
static struct aa_sfs_entry aa_sfs_entry_versions[] = {
AA_SFS_FILE_BOOLEAN("v5", 1),
AA_SFS_FILE_BOOLEAN("v6", 1),
AA_SFS_FILE_BOOLEAN("v7", 1),
{ }
};

20
security/apparmor/policy_unpack.c
View File

@ -466,7 +466,7 @@ static bool unpack_trans_table(struct aa_ext *e, struct aa_profile *profile)
profile->file.trans.size = size;
for (i = 0; i < size; i++) {
char *str;
int c, j, size2 = unpack_strdup(e, &str, NULL);
int c, j, pos, size2 = unpack_strdup(e, &str, NULL);
/* unpack_strdup verifies that the last character is
* null termination byte.
*/
@ -478,19 +478,25 @@ static bool unpack_trans_table(struct aa_ext *e, struct aa_profile *profile)
goto fail;
/* count internal # of internal \0 */
for (c = j = 0; j < size2 - 2; j++) {
if (!str[j])
for (c = j = 0; j < size2 - 1; j++) {
if (!str[j]) {
pos = j;
c++;
}
}
if (*str == ':') {
/* first character after : must be valid */
if (!str[1])
goto fail;
/* beginning with : requires an embedded \0,
* verify that exactly 1 internal \0 exists
* trailing \0 already verified by unpack_strdup
*
* convert \0 back to : for label_parse
*/
if (c != 1)
goto fail;
/* first character after : must be valid */
if (!str[1])
if (c == 1)
str[pos] = ':';
else if (c > 1)
goto fail;
} else if (c)
/* fail - all other cases with embedded \0 */