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Diffstat (limited to 'security/tomoyo/file.c')
-rw-r--r--security/tomoyo/file.c181
1 files changed, 83 insertions, 98 deletions
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index 060bbf3870ce..6651cac87625 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -164,38 +164,36 @@ LIST_HEAD(tomoyo_globally_readable_list);
static int tomoyo_update_globally_readable_entry(const char *filename,
const bool is_delete)
{
- struct tomoyo_globally_readable_file_entry *entry = NULL;
struct tomoyo_globally_readable_file_entry *ptr;
- const struct tomoyo_path_info *saved_filename;
+ struct tomoyo_globally_readable_file_entry e = { };
int error = is_delete ? -ENOENT : -ENOMEM;
if (!tomoyo_is_correct_path(filename, 1, 0, -1))
return -EINVAL;
- saved_filename = tomoyo_get_name(filename);
- if (!saved_filename)
+ e.filename = tomoyo_get_name(filename);
+ if (!e.filename)
return -ENOMEM;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) {
- if (ptr->filename != saved_filename)
+ if (ptr->filename != e.filename)
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->filename = saved_filename;
- saved_filename = NULL;
- list_add_tail_rcu(&entry->list, &tomoyo_globally_readable_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_globally_readable_file_entry *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->list,
+ &tomoyo_globally_readable_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- tomoyo_put_name(saved_filename);
- kfree(entry);
+ tomoyo_put_name(e.filename);
return error;
}
@@ -313,38 +311,34 @@ LIST_HEAD(tomoyo_pattern_list);
static int tomoyo_update_file_pattern_entry(const char *pattern,
const bool is_delete)
{
- struct tomoyo_pattern_entry *entry = NULL;
struct tomoyo_pattern_entry *ptr;
- const struct tomoyo_path_info *saved_pattern;
+ struct tomoyo_pattern_entry e = { .pattern = tomoyo_get_name(pattern) };
int error = is_delete ? -ENOENT : -ENOMEM;
- saved_pattern = tomoyo_get_name(pattern);
- if (!saved_pattern)
+ if (!e.pattern)
return error;
- if (!saved_pattern->is_patterned)
+ if (!e.pattern->is_patterned)
goto out;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) {
- if (saved_pattern != ptr->pattern)
+ if (e.pattern != ptr->pattern)
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->pattern = saved_pattern;
- saved_pattern = NULL;
- list_add_tail_rcu(&entry->list, &tomoyo_pattern_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_pattern_entry *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->list, &tomoyo_pattern_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- kfree(entry);
- tomoyo_put_name(saved_pattern);
+ tomoyo_put_name(e.pattern);
return error;
}
@@ -467,38 +461,36 @@ LIST_HEAD(tomoyo_no_rewrite_list);
static int tomoyo_update_no_rewrite_entry(const char *pattern,
const bool is_delete)
{
- struct tomoyo_no_rewrite_entry *entry = NULL;
struct tomoyo_no_rewrite_entry *ptr;
- const struct tomoyo_path_info *saved_pattern;
+ struct tomoyo_no_rewrite_entry e = { };
int error = is_delete ? -ENOENT : -ENOMEM;
if (!tomoyo_is_correct_path(pattern, 0, 0, 0))
return -EINVAL;
- saved_pattern = tomoyo_get_name(pattern);
- if (!saved_pattern)
+ e.pattern = tomoyo_get_name(pattern);
+ if (!e.pattern)
return error;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) {
- if (ptr->pattern != saved_pattern)
+ if (ptr->pattern != e.pattern)
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->pattern = saved_pattern;
- saved_pattern = NULL;
- list_add_tail_rcu(&entry->list, &tomoyo_no_rewrite_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_no_rewrite_entry *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->list,
+ &tomoyo_no_rewrite_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- tomoyo_put_name(saved_pattern);
- kfree(entry);
+ tomoyo_put_name(e.pattern);
return error;
}
@@ -810,23 +802,26 @@ static int tomoyo_update_path_acl(const u8 type, const char *filename,
struct tomoyo_domain_info *const domain,
const bool is_delete)
{
- static const u32 rw_mask =
+ static const u32 tomoyo_rw_mask =
(1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE);
- const struct tomoyo_path_info *saved_filename;
+ const u32 perm = 1 << type;
struct tomoyo_acl_info *ptr;
- struct tomoyo_path_acl *entry = NULL;
+ struct tomoyo_path_acl e = {
+ .head.type = TOMOYO_TYPE_PATH_ACL,
+ .perm_high = perm >> 16,
+ .perm = perm
+ };
int error = is_delete ? -ENOENT : -ENOMEM;
- const u32 perm = 1 << type;
+ if (type == TOMOYO_TYPE_READ_WRITE)
+ e.perm |= tomoyo_rw_mask;
if (!domain)
return -EINVAL;
if (!tomoyo_is_correct_path(filename, 0, 0, 0))
return -EINVAL;
- saved_filename = tomoyo_get_name(filename);
- if (!saved_filename)
+ e.filename = tomoyo_get_name(filename);
+ if (!e.filename)
return -ENOMEM;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
@@ -834,48 +829,42 @@ static int tomoyo_update_path_acl(const u8 type, const char *filename,
container_of(ptr, struct tomoyo_path_acl, head);
if (ptr->type != TOMOYO_TYPE_PATH_ACL)
continue;
- if (acl->filename != saved_filename)
+ if (acl->filename != e.filename)
continue;
if (is_delete) {
if (perm <= 0xFFFF)
acl->perm &= ~perm;
else
acl->perm_high &= ~(perm >> 16);
- if ((acl->perm & rw_mask) != rw_mask)
+ if ((acl->perm & tomoyo_rw_mask) != tomoyo_rw_mask)
acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE);
else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)))
- acl->perm &= ~rw_mask;
+ acl->perm &= ~tomoyo_rw_mask;
} else {
if (perm <= 0xFFFF)
acl->perm |= perm;
else
acl->perm_high |= (perm >> 16);
- if ((acl->perm & rw_mask) == rw_mask)
+ if ((acl->perm & tomoyo_rw_mask) == tomoyo_rw_mask)
acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE;
else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))
- acl->perm |= rw_mask;
+ acl->perm |= tomoyo_rw_mask;
}
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->head.type = TOMOYO_TYPE_PATH_ACL;
- if (perm <= 0xFFFF)
- entry->perm = perm;
- else
- entry->perm_high = (perm >> 16);
- if (perm == (1 << TOMOYO_TYPE_READ_WRITE))
- entry->perm |= rw_mask;
- entry->filename = saved_filename;
- saved_filename = NULL;
- list_add_tail_rcu(&entry->head.list, &domain->acl_info_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_path_acl *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->head.list,
+ &domain->acl_info_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- kfree(entry);
- tomoyo_put_name(saved_filename);
+ tomoyo_put_name(e.filename);
return error;
}
@@ -897,24 +886,23 @@ static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
struct tomoyo_domain_info *const domain,
const bool is_delete)
{
- const struct tomoyo_path_info *saved_filename1;
- const struct tomoyo_path_info *saved_filename2;
+ const u8 perm = 1 << type;
+ struct tomoyo_path2_acl e = {
+ .head.type = TOMOYO_TYPE_PATH2_ACL,
+ .perm = perm
+ };
struct tomoyo_acl_info *ptr;
- struct tomoyo_path2_acl *entry = NULL;
int error = is_delete ? -ENOENT : -ENOMEM;
- const u8 perm = 1 << type;
if (!domain)
return -EINVAL;
if (!tomoyo_is_correct_path(filename1, 0, 0, 0) ||
!tomoyo_is_correct_path(filename2, 0, 0, 0))
return -EINVAL;
- saved_filename1 = tomoyo_get_name(filename1);
- saved_filename2 = tomoyo_get_name(filename2);
- if (!saved_filename1 || !saved_filename2)
+ e.filename1 = tomoyo_get_name(filename1);
+ e.filename2 = tomoyo_get_name(filename2);
+ if (!e.filename1 || !e.filename2)
goto out;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
@@ -922,8 +910,8 @@ static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
container_of(ptr, struct tomoyo_path2_acl, head);
if (ptr->type != TOMOYO_TYPE_PATH2_ACL)
continue;
- if (acl->filename1 != saved_filename1 ||
- acl->filename2 != saved_filename2)
+ if (acl->filename1 != e.filename1 ||
+ acl->filename2 != e.filename2)
continue;
if (is_delete)
acl->perm &= ~perm;
@@ -932,22 +920,19 @@ static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->head.type = TOMOYO_TYPE_PATH2_ACL;
- entry->perm = perm;
- entry->filename1 = saved_filename1;
- saved_filename1 = NULL;
- entry->filename2 = saved_filename2;
- saved_filename2 = NULL;
- list_add_tail_rcu(&entry->head.list, &domain->acl_info_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_path2_acl *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->head.list,
+ &domain->acl_info_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- tomoyo_put_name(saved_filename1);
- tomoyo_put_name(saved_filename2);
- kfree(entry);
+ tomoyo_put_name(e.filename1);
+ tomoyo_put_name(e.filename2);
return error;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.