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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-24 13:00:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-24 13:00:33 -0700
commit57bb8e37d71eac45b6ea9180698a9cc3db945e26 (patch)
treea0ec057a95a4e2b0356d959808c33fd966b3a80d /security/apparmor
parentaa5b1054badb60191f6a09e7ef65beacf837c5d4 (diff)
parentc037bd615885f1d9d3bdb48531bace79fae1505d (diff)
downloadlinux-57bb8e37d71eac45b6ea9180698a9cc3db945e26.tar.bz2
Merge tag 'apparmor-pr-2018-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor
Pull apparmor updates from John Johansen: "There is nothing major this time just four bug fixes and a patch to remove some dead code: Cleanups: - remove no-op permission check in policy_unpack Bug fixes: - fix an error code in __aa_create_ns() - fix failure to audit context info in build_change_hat - check buffer bounds when mapping permissions mask - fully initialize aa_perms struct when answering userspace query" * tag 'apparmor-pr-2018-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor: apparmor: remove no-op permission check in policy_unpack apparmor: fix an error code in __aa_create_ns() apparmor: Fix failure to audit context info in build_change_hat apparmor: Fully initialize aa_perms struct when answering userspace query apparmor: Check buffer bounds when mapping permissions mask
Diffstat (limited to 'security/apparmor')
-rw-r--r--security/apparmor/apparmorfs.c5
-rw-r--r--security/apparmor/domain.c2
-rw-r--r--security/apparmor/file.c3
-rw-r--r--security/apparmor/include/perms.h3
-rw-r--r--security/apparmor/lib.c17
-rw-r--r--security/apparmor/policy_ns.c2
-rw-r--r--security/apparmor/policy_unpack.c32
7 files changed, 20 insertions, 44 deletions
diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 949dd8a48164..e09fe4d7307c 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -603,7 +603,7 @@ static const struct file_operations aa_fs_ns_revision_fops = {
static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
const char *match_str, size_t match_len)
{
- struct aa_perms tmp;
+ struct aa_perms tmp = { };
struct aa_dfa *dfa;
unsigned int state = 0;
@@ -613,7 +613,6 @@ static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
dfa = profile->file.dfa;
state = aa_dfa_match_len(dfa, profile->file.start,
match_str + 1, match_len - 1);
- tmp = nullperms;
if (state) {
struct path_cond cond = { };
@@ -627,8 +626,6 @@ static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
match_str, match_len);
if (state)
aa_compute_perms(dfa, state, &tmp);
- else
- tmp = nullperms;
}
aa_apply_modes_to_perms(profile, &tmp);
aa_perms_accum_raw(perms, &tmp);
diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
index 098d546d8253..08c88de0ffda 100644
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -1036,7 +1036,7 @@ static struct aa_label *build_change_hat(struct aa_profile *profile,
audit:
aa_audit_file(profile, &nullperms, OP_CHANGE_HAT, AA_MAY_CHANGEHAT,
name, hat ? hat->base.hname : NULL,
- hat ? &hat->label : NULL, GLOBAL_ROOT_UID, NULL,
+ hat ? &hat->label : NULL, GLOBAL_ROOT_UID, info,
error);
if (!hat || (error && error != -ENOENT))
return ERR_PTR(error);
diff --git a/security/apparmor/file.c b/security/apparmor/file.c
index 224b2fef93ca..4285943f7260 100644
--- a/security/apparmor/file.c
+++ b/security/apparmor/file.c
@@ -47,7 +47,8 @@ static void audit_file_mask(struct audit_buffer *ab, u32 mask)
{
char str[10];
- aa_perm_mask_to_str(str, aa_file_perm_chrs, map_mask_to_chr_mask(mask));
+ aa_perm_mask_to_str(str, sizeof(str), aa_file_perm_chrs,
+ map_mask_to_chr_mask(mask));
audit_log_string(ab, str);
}
diff --git a/security/apparmor/include/perms.h b/security/apparmor/include/perms.h
index 38aa6247d00f..b94ec114d1a4 100644
--- a/security/apparmor/include/perms.h
+++ b/security/apparmor/include/perms.h
@@ -137,7 +137,8 @@ extern struct aa_perms allperms;
xcheck(fn_for_each((L1), (P), (FN1)), fn_for_each((L2), (P), (FN2)))
-void aa_perm_mask_to_str(char *str, const char *chrs, u32 mask);
+void aa_perm_mask_to_str(char *str, size_t str_size, const char *chrs,
+ u32 mask);
void aa_audit_perm_names(struct audit_buffer *ab, const char * const *names,
u32 mask);
void aa_audit_perm_mask(struct audit_buffer *ab, u32 mask, const char *chrs,
diff --git a/security/apparmor/lib.c b/security/apparmor/lib.c
index a7b3f681b80e..974affe50531 100644
--- a/security/apparmor/lib.c
+++ b/security/apparmor/lib.c
@@ -198,15 +198,24 @@ const char *aa_file_perm_names[] = {
/**
* aa_perm_mask_to_str - convert a perm mask to its short string
* @str: character buffer to store string in (at least 10 characters)
+ * @str_size: size of the @str buffer
+ * @chrs: NUL-terminated character buffer of permission characters
* @mask: permission mask to convert
*/
-void aa_perm_mask_to_str(char *str, const char *chrs, u32 mask)
+void aa_perm_mask_to_str(char *str, size_t str_size, const char *chrs, u32 mask)
{
unsigned int i, perm = 1;
+ size_t num_chrs = strlen(chrs);
+
+ for (i = 0; i < num_chrs; perm <<= 1, i++) {
+ if (mask & perm) {
+ /* Ensure that one byte is left for NUL-termination */
+ if (WARN_ON_ONCE(str_size <= 1))
+ break;
- for (i = 0; i < 32; perm <<= 1, i++) {
- if (mask & perm)
*str++ = chrs[i];
+ str_size--;
+ }
}
*str = '\0';
}
@@ -236,7 +245,7 @@ void aa_audit_perm_mask(struct audit_buffer *ab, u32 mask, const char *chrs,
audit_log_format(ab, "\"");
if ((mask & chrsmask) && chrs) {
- aa_perm_mask_to_str(str, chrs, mask & chrsmask);
+ aa_perm_mask_to_str(str, sizeof(str), chrs, mask & chrsmask);
mask &= ~chrsmask;
audit_log_format(ab, "%s", str);
if (mask & namesmask)
diff --git a/security/apparmor/policy_ns.c b/security/apparmor/policy_ns.c
index b0f9dc3f765a..1a7cec5d9cac 100644
--- a/security/apparmor/policy_ns.c
+++ b/security/apparmor/policy_ns.c
@@ -255,7 +255,7 @@ static struct aa_ns *__aa_create_ns(struct aa_ns *parent, const char *name,
ns = alloc_ns(parent->base.hname, name);
if (!ns)
- return NULL;
+ return ERR_PTR(-ENOMEM);
ns->level = parent->level + 1;
mutex_lock_nested(&ns->lock, ns->level);
error = __aafs_ns_mkdir(ns, ns_subns_dir(parent), name, dir);
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index 0e566a01d217..21cb384d712a 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -389,32 +389,6 @@ static int unpack_strdup(struct aa_ext *e, char **string, const char *name)
return res;
}
-#define DFA_VALID_PERM_MASK 0xffffffff
-#define DFA_VALID_PERM2_MASK 0xffffffff
-
-/**
- * verify_accept - verify the accept tables of a dfa
- * @dfa: dfa to verify accept tables of (NOT NULL)
- * @flags: flags governing dfa
- *
- * Returns: 1 if valid accept tables else 0 if error
- */
-static bool verify_accept(struct aa_dfa *dfa, int flags)
-{
- int i;
-
- /* verify accept permissions */
- for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) {
- int mode = ACCEPT_TABLE(dfa)[i];
-
- if (mode & ~DFA_VALID_PERM_MASK)
- return 0;
-
- if (ACCEPT_TABLE2(dfa)[i] & ~DFA_VALID_PERM2_MASK)
- return 0;
- }
- return 1;
-}
/**
* unpack_dfa - unpack a file rule dfa
@@ -445,15 +419,9 @@ static struct aa_dfa *unpack_dfa(struct aa_ext *e)
if (IS_ERR(dfa))
return dfa;
- if (!verify_accept(dfa, flags))
- goto fail;
}
return dfa;
-
-fail:
- aa_put_dfa(dfa);
- return ERR_PTR(-EPROTO);
}
/**