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apparmor: fix: kzalloc perms tables for shared dfas

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Currently the permstables of the shared dfas are not shared, and need
to be allocated and copied. In the future this should be addressed
with a larger rework on dfa and pdb ref counts and structure sharing.

BugLink: http://bugs.launchpad.net/bugs/2017903
Fixes: 217af7e2f4 ("apparmor: refactor profile rules and attachments")
Cc: stable@vger.kernel.org
Signed-off-by: John Johansen <john.johansen@canonical.com>
Reviewed-by: Jon Tourville <jontourville@me.com>
This commit is contained in:
John Johansen 2023-04-15 00:50:32 -07:00
parent 6f442d42c0
commit ec6851ae0a
2 changed files with 35 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
security/apparmor/policy.c
View File

@ -589,7 +589,15 @@ struct aa_profile *aa_alloc_null(struct aa_profile *parent, const char *name,
profile->label.flags |= FLAG_NULL;
rules = list_first_entry(&profile->rules, typeof(*rules), list);
rules->file.dfa = aa_get_dfa(nulldfa);
rules->file.perms = kcalloc(2, sizeof(struct aa_perms), GFP_KERNEL);
if (!rules->file.perms)
goto fail;
rules->file.size = 2;
rules->policy.dfa = aa_get_dfa(nulldfa);
rules->policy.perms = kcalloc(2, sizeof(struct aa_perms), GFP_KERNEL);
if (!rules->policy.perms)
goto fail;
rules->policy.size = 2;
if (parent) {
profile->path_flags = parent->path_flags;
@ -600,6 +608,11 @@ struct aa_profile *aa_alloc_null(struct aa_profile *parent, const char *name,
}
return profile;
fail:
aa_free_profile(profile);
return NULL;
}
/**

26
security/apparmor/policy_unpack.c
View File

@ -982,9 +982,14 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
goto fail;
}
}
} else
} else {
rules->policy.dfa = aa_get_dfa(nulldfa);
rules->policy.perms = kcalloc(2, sizeof(struct aa_perms),
GFP_KERNEL);
if (!rules->policy.perms)
goto fail;
rules->policy.size = 2;
}
/* get file rules */
error = unpack_pdb(e, &rules->file, false, true, &info);
if (error) {
@ -1001,9 +1006,22 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
rules->policy.start[AA_CLASS_FILE]) {
rules->file.dfa = aa_get_dfa(rules->policy.dfa);
rules->file.start[AA_CLASS_FILE] = rules->policy.start[AA_CLASS_FILE];
} else
rules->file.perms = kcalloc(rules->policy.size,
sizeof(struct aa_perms),
GFP_KERNEL);
if (!rules->file.perms)
goto fail;
memcpy(rules->file.perms, rules->policy.perms,
rules->policy.size * sizeof(struct aa_perms));
rules->file.size = rules->policy.size;
} else {
rules->file.dfa = aa_get_dfa(nulldfa);
rules->file.perms = kcalloc(2, sizeof(struct aa_perms),
GFP_KERNEL);
if (!rules->file.perms)
goto fail;
rules->file.size = 2;
}
error = -EPROTO;
if (aa_unpack_nameX(e, AA_STRUCT, "data")) {
info = "out of memory";