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selinux/stable-5.17 PR 20220110

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Merge tag 'selinux-pr-20220110' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull selinux updates from Paul Moore:
 "Nothing too significant, but five SELinux patches for v5.17 that do
  the following:

   - Harden the code through additional use of the struct_size() macro

   - Plug some memory leaks

   - Clean up the code via removal of the security_add_mnt_opt() LSM
     hook and minor tweaks to selinux_add_opt()

   - Rename security_task_getsecid_subj() to better reflect its actual
     behavior/use - now called security_current_getsecid_subj()"

* tag 'selinux-pr-20220110' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  selinux: minor tweaks to selinux_add_opt()
  selinux: fix potential memleak in selinux_add_opt()
  security,selinux: remove security_add_mnt_opt()
  selinux: Use struct_size() helper in kmalloc()
  lsm: security_task_getsecid_subj() -> security_current_getsecid_subj()
This commit is contained in:
Linus Torvalds 2022-01-11 13:03:06 -08:00
commit a135ce4400
17 changed files with 70 additions and 137 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/lsm_hook_defs.h
View File

@ -78,8 +78,6 @@ LSM_HOOK(int, 0, sb_set_mnt_opts, struct super_block *sb, void *mnt_opts,
LSM_HOOK(int, 0, sb_clone_mnt_opts, const struct super_block *oldsb,
struct super_block *newsb, unsigned long kern_flags,
unsigned long *set_kern_flags)
LSM_HOOK(int, 0, sb_add_mnt_opt, const char *option, const char *val,
int len, void **mnt_opts)
LSM_HOOK(int, 0, move_mount, const struct path *from_path,
const struct path *to_path)
LSM_HOOK(int, 0, dentry_init_security, struct dentry *dentry,
@ -206,8 +204,7 @@ LSM_HOOK(int, 0, task_fix_setgid, struct cred *new, const struct cred * old,
LSM_HOOK(int, 0, task_setpgid, struct task_struct *p, pid_t pgid)
LSM_HOOK(int, 0, task_getpgid, struct task_struct *p)
LSM_HOOK(int, 0, task_getsid, struct task_struct *p)
LSM_HOOK(void, LSM_RET_VOID, task_getsecid_subj,
struct task_struct *p, u32 *secid)
LSM_HOOK(void, LSM_RET_VOID, current_getsecid_subj, u32 *secid)
LSM_HOOK(void, LSM_RET_VOID, task_getsecid_obj,
struct task_struct *p, u32 *secid)
LSM_HOOK(int, 0, task_setnice, struct task_struct *p, int nice)

10
include/linux/lsm_hooks.h
View File

@ -180,8 +180,6 @@
* Copy all security options from a given superblock to another
* @oldsb old superblock which contain information to clone
* @newsb new superblock which needs filled in
* @sb_add_mnt_opt:
* Add one mount @option to @mnt_opts.
* @sb_parse_opts_str:
* Parse a string of security data filling in the opts structure
* @options string containing all mount options known by the LSM
@ -719,11 +717,9 @@
* @p.
* @p contains the task_struct for the process.
* Return 0 if permission is granted.
* @task_getsecid_subj:
* Retrieve the subjective security identifier of the task_struct in @p
* and return it in @secid. Special care must be taken to ensure that @p
* is the either the "current" task, or the caller has exclusive access
* to @p.
* @current_getsecid_subj:
* Retrieve the subjective security identifier of the current task and
* return it in @secid.
* In case of failure, @secid will be set to zero.
* @task_getsecid_obj:
* Retrieve the objective security identifier of the task_struct in @p

12
include/linux/security.h
View File

@ -313,8 +313,6 @@ int security_sb_clone_mnt_opts(const struct super_block *oldsb,
struct super_block *newsb,
unsigned long kern_flags,
unsigned long *set_kern_flags);
int security_add_mnt_opt(const char *option, const char *val,
int len, void **mnt_opts);
int security_move_mount(const struct path *from_path, const struct path *to_path);
int security_dentry_init_security(struct dentry *dentry, int mode,
const struct qstr *name,
@ -418,7 +416,7 @@ int security_task_fix_setgid(struct cred *new, const struct cred *old,
int security_task_setpgid(struct task_struct *p, pid_t pgid);
int security_task_getpgid(struct task_struct *p);
int security_task_getsid(struct task_struct *p);
void security_task_getsecid_subj(struct task_struct *p, u32 *secid);
void security_current_getsecid_subj(u32 *secid);
void security_task_getsecid_obj(struct task_struct *p, u32 *secid);
int security_task_setnice(struct task_struct *p, int nice);
int security_task_setioprio(struct task_struct *p, int ioprio);
@ -711,12 +709,6 @@ static inline int security_sb_clone_mnt_opts(const struct super_block *oldsb,
return 0;
}
static inline int security_add_mnt_opt(const char *option, const char *val,
int len, void **mnt_opts)
{
return 0;
}
static inline int security_move_mount(const struct path *from_path,
const struct path *to_path)
{
@ -1119,7 +1111,7 @@ static inline int security_task_getsid(struct task_struct *p)
return 0;
}
static inline void security_task_getsecid_subj(struct task_struct *p, u32 *secid)
static inline void security_current_getsecid_subj(u32 *secid)
{
*secid = 0;
}

4
kernel/audit.c
View File

@ -2131,7 +2131,7 @@ int audit_log_task_context(struct audit_buffer *ab)
int error;
u32 sid;
security_task_getsecid_subj(current, &sid);
security_current_getsecid_subj(&sid);
if (!sid)
return 0;
@ -2352,7 +2352,7 @@ int audit_signal_info(int sig, struct task_struct *t)
audit_sig_uid = auid;
else
audit_sig_uid = uid;
security_task_getsecid_subj(current, &audit_sig_sid);
security_current_getsecid_subj(&audit_sig_sid);
}
return audit_signal_info_syscall(t);

3
kernel/auditfilter.c
View File

@ -1368,8 +1368,7 @@ int audit_filter(int msgtype, unsigned int listtype)
case AUDIT_SUBJ_SEN:
case AUDIT_SUBJ_CLR:
if (f->lsm_rule) {
security_task_getsecid_subj(current,
&sid);
security_current_getsecid_subj(&sid);
result = security_audit_rule_match(sid,
f->type, f->op, f->lsm_rule);
}

11
kernel/auditsc.c
View File

@ -666,7 +666,16 @@ static int audit_filter_rules(struct task_struct *tsk,
logged upon error */
if (f->lsm_rule) {
if (need_sid) {
security_task_getsecid_subj(tsk, &sid);
/* @tsk should always be equal to
* @current with the exception of
* fork()/copy_process() in which case
* the new @tsk creds are still a dup
* of @current's creds so we can still
* use security_current_getsecid_subj()
* here even though it always refs
* @current's creds
*/
security_current_getsecid_subj(&sid);
need_sid = 0;
}
result = security_audit_rule_match(sid, f->type,

2
net/netlabel/netlabel_unlabeled.c
View File

@ -1537,7 +1537,7 @@ int __init netlbl_unlabel_defconf(void)
/* Only the kernel is allowed to call this function and the only time
* it is called is at bootup before the audit subsystem is reporting
* messages so don't worry to much about these values. */
security_task_getsecid_subj(current, &audit_info.secid);
security_current_getsecid_subj(&audit_info.secid);
audit_info.loginuid = GLOBAL_ROOT_UID;
audit_info.sessionid = 0;

2
net/netlabel/netlabel_user.h
View File

@ -32,7 +32,7 @@
*/
static inline void netlbl_netlink_auditinfo(struct netlbl_audit *audit_info)
{
security_task_getsecid_subj(current, &audit_info->secid);
security_current_getsecid_subj(&audit_info->secid);
audit_info->loginuid = audit_get_loginuid(current);
audit_info->sessionid = audit_get_sessionid(current);
}

13
security/apparmor/lsm.c
View File

@ -728,7 +728,14 @@ static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
return;
}
static void apparmor_task_getsecid(struct task_struct *p, u32 *secid)
static void apparmor_current_getsecid_subj(u32 *secid)
{
struct aa_label *label = aa_get_current_label();
*secid = label->secid;
aa_put_label(label);
}
static void apparmor_task_getsecid_obj(struct task_struct *p, u32 *secid)
{
struct aa_label *label = aa_get_task_label(p);
*secid = label->secid;
@ -1252,8 +1259,8 @@ static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(task_free, apparmor_task_free),
LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
LSM_HOOK_INIT(task_getsecid_subj, apparmor_task_getsecid),
LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid),
LSM_HOOK_INIT(current_getsecid_subj, apparmor_current_getsecid_subj),
LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid_obj),
LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
LSM_HOOK_INIT(task_kill, apparmor_task_kill),

2
security/integrity/ima/ima_appraise.c
View File

@ -76,7 +76,7 @@ int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode,
if (!ima_appraise)
return 0;
security_task_getsecid_subj(current, &secid);
security_current_getsecid_subj(&secid);
return ima_match_policy(mnt_userns, inode, current_cred(), secid,
func, mask, IMA_APPRAISE | IMA_HASH, NULL,
NULL, NULL, NULL);

14
security/integrity/ima/ima_main.c
View File

@ -408,7 +408,7 @@ int ima_file_mmap(struct file *file, unsigned long prot)
u32 secid;
if (file && (prot & PROT_EXEC)) {
security_task_getsecid_subj(current, &secid);
security_current_getsecid_subj(&secid);
return process_measurement(file, current_cred(), secid, NULL,
0, MAY_EXEC, MMAP_CHECK);
}
@ -446,7 +446,7 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
!(prot & PROT_EXEC) || (vma->vm_flags & VM_EXEC))
return 0;
security_task_getsecid_subj(current, &secid);
security_current_getsecid_subj(&secid);
inode = file_inode(vma->vm_file);
action = ima_get_action(file_mnt_user_ns(vma->vm_file), inode,
current_cred(), secid, MAY_EXEC, MMAP_CHECK,
@ -487,7 +487,7 @@ int ima_bprm_check(struct linux_binprm *bprm)
int ret;
u32 secid;
security_task_getsecid_subj(current, &secid);
security_current_getsecid_subj(&secid);
ret = process_measurement(bprm->file, current_cred(), secid, NULL, 0,
MAY_EXEC, BPRM_CHECK);
if (ret)
@ -512,7 +512,7 @@ int ima_file_check(struct file *file, int mask)
{
u32 secid;
security_task_getsecid_subj(current, &secid);
security_current_getsecid_subj(&secid);
return process_measurement(file, current_cred(), secid, NULL, 0,
mask & (MAY_READ | MAY_WRITE | MAY_EXEC |
MAY_APPEND), FILE_CHECK);
@ -709,7 +709,7 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id,
/* Read entire file for all partial reads. */
func = read_idmap[read_id] ?: FILE_CHECK;
security_task_getsecid_subj(current, &secid);
security_current_getsecid_subj(&secid);
return process_measurement(file, current_cred(), secid, NULL,
0, MAY_READ, func);
}
@ -752,7 +752,7 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
}
func = read_idmap[read_id] ?: FILE_CHECK;
security_task_getsecid_subj(current, &secid);
security_current_getsecid_subj(&secid);
return process_measurement(file, current_cred(), secid, buf, size,
MAY_READ, func);
}
@ -905,7 +905,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns,
* buffer measurements.
*/
if (func) {
security_task_getsecid_subj(current, &secid);
security_current_getsecid_subj(&secid);
action = ima_get_action(mnt_userns, inode, current_cred(),
secid, 0, func, &pcr, &template,
func_data, NULL);

14
security/security.c
View File

@ -994,14 +994,6 @@ int security_sb_clone_mnt_opts(const struct super_block *oldsb,
}
EXPORT_SYMBOL(security_sb_clone_mnt_opts);
int security_add_mnt_opt(const char *option, const char *val, int len,
void **mnt_opts)
{
return call_int_hook(sb_add_mnt_opt, -EINVAL,
option, val, len, mnt_opts);
}
EXPORT_SYMBOL(security_add_mnt_opt);
int security_move_mount(const struct path *from_path, const struct path *to_path)
{
return call_int_hook(move_mount, 0, from_path, to_path);
@ -1808,12 +1800,12 @@ int security_task_getsid(struct task_struct *p)
return call_int_hook(task_getsid, 0, p);
}
void security_task_getsecid_subj(struct task_struct *p, u32 *secid)
void security_current_getsecid_subj(u32 *secid)
{
*secid = 0;
call_void_hook(task_getsecid_subj, p, secid);
call_void_hook(current_getsecid_subj, secid);
}
EXPORT_SYMBOL(security_task_getsecid_subj);
EXPORT_SYMBOL(security_current_getsecid_subj);
void security_task_getsecid_obj(struct task_struct *p, u32 *secid)
{

84
security/selinux/hooks.c
View File

@ -229,19 +229,6 @@ static inline u32 cred_sid(const struct cred *cred)
return tsec->sid;
}
/*
* get the subjective security ID of a task
*/
static inline u32 task_sid_subj(const struct task_struct *task)
{
u32 sid;
rcu_read_lock();
sid = cred_sid(rcu_dereference(task->cred));
rcu_read_unlock();
return sid;
}
/*
* get the objective security ID of a task
*/
@ -988,82 +975,54 @@ static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
static int selinux_add_opt(int token, const char *s, void **mnt_opts)
{
struct selinux_mnt_opts *opts = *mnt_opts;
bool is_alloc_opts = false;
if (token == Opt_seclabel) /* eaten and completely ignored */
if (token == Opt_seclabel)
/* eaten and completely ignored */
return 0;
if (!s)
return -ENOMEM;
if (!opts) {
opts = kzalloc(sizeof(struct selinux_mnt_opts), GFP_KERNEL);
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
if (!opts)
return -ENOMEM;
*mnt_opts = opts;
is_alloc_opts = true;
}
if (!s)
return -ENOMEM;
switch (token) {
case Opt_context:
if (opts->context || opts->defcontext)
goto Einval;
goto err;
opts->context = s;
break;
case Opt_fscontext:
if (opts->fscontext)
goto Einval;
goto err;
opts->fscontext = s;
break;
case Opt_rootcontext:
if (opts->rootcontext)
goto Einval;
goto err;
opts->rootcontext = s;
break;
case Opt_defcontext:
if (opts->context || opts->defcontext)
goto Einval;
goto err;
opts->defcontext = s;
break;
}
return 0;
Einval:
pr_warn(SEL_MOUNT_FAIL_MSG);
return -EINVAL;
}
static int selinux_add_mnt_opt(const char *option, const char *val, int len,
void **mnt_opts)
{
int token = Opt_error;
int rc, i;
for (i = 0; i < ARRAY_SIZE(tokens); i++) {
if (strcmp(option, tokens[i].name) == 0) {
token = tokens[i].opt;
break;
}
}
if (token == Opt_error)
return -EINVAL;
if (token != Opt_seclabel) {
val = kmemdup_nul(val, len, GFP_KERNEL);
if (!val) {
rc = -ENOMEM;
goto free_opt;
}
}
rc = selinux_add_opt(token, val, mnt_opts);
if (unlikely(rc)) {
kfree(val);
goto free_opt;
}
return rc;
free_opt:
if (*mnt_opts) {
selinux_free_mnt_opts(*mnt_opts);
err:
if (is_alloc_opts) {
kfree(opts);
*mnt_opts = NULL;
}
return rc;
pr_warn(SEL_MOUNT_FAIL_MSG);
return -EINVAL;
}
static int show_sid(struct seq_file *m, u32 sid)
@ -4210,9 +4169,9 @@ static int selinux_task_getsid(struct task_struct *p)
PROCESS__GETSESSION, NULL);
}
static void selinux_task_getsecid_subj(struct task_struct *p, u32 *secid)
static void selinux_current_getsecid_subj(u32 *secid)
{
*secid = task_sid_subj(p);
*secid = current_sid();
}
static void selinux_task_getsecid_obj(struct task_struct *p, u32 *secid)
@ -7164,7 +7123,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(task_setpgid, selinux_task_setpgid),
LSM_HOOK_INIT(task_getpgid, selinux_task_getpgid),
LSM_HOOK_INIT(task_getsid, selinux_task_getsid),
LSM_HOOK_INIT(task_getsecid_subj, selinux_task_getsecid_subj),
LSM_HOOK_INIT(current_getsecid_subj, selinux_current_getsecid_subj),
LSM_HOOK_INIT(task_getsecid_obj, selinux_task_getsecid_obj),
LSM_HOOK_INIT(task_setnice, selinux_task_setnice),
LSM_HOOK_INIT(task_setioprio, selinux_task_setioprio),
@ -7303,7 +7262,6 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(fs_context_dup, selinux_fs_context_dup),
LSM_HOOK_INIT(fs_context_parse_param, selinux_fs_context_parse_param),
LSM_HOOK_INIT(sb_eat_lsm_opts, selinux_sb_eat_lsm_opts),
LSM_HOOK_INIT(sb_add_mnt_opt, selinux_add_mnt_opt),
#ifdef CONFIG_SECURITY_NETWORK_XFRM
LSM_HOOK_INIT(xfrm_policy_clone_security, selinux_xfrm_policy_clone),
#endif

2
security/selinux/ss/sidtab.c
View File

@ -570,7 +570,7 @@ void sidtab_sid2str_put(struct sidtab *s, struct sidtab_entry *entry,
goto out_unlock;
}
cache = kmalloc(sizeof(struct sidtab_str_cache) + str_len, GFP_ATOMIC);
cache = kmalloc(struct_size(cache, str, str_len), GFP_ATOMIC);
if (!cache)
goto out_unlock;

4
security/selinux/xfrm.c
View File

@ -89,7 +89,7 @@ static int selinux_xfrm_alloc_user(struct xfrm_sec_ctx **ctxp,
if (str_len >= PAGE_SIZE)
return -ENOMEM;
ctx = kmalloc(sizeof(*ctx) + str_len + 1, gfp);
ctx = kmalloc(struct_size(ctx, ctx_str, str_len + 1), gfp);
if (!ctx)
return -ENOMEM;
@ -360,7 +360,7 @@ int selinux_xfrm_state_alloc_acquire(struct xfrm_state *x,
if (rc)
return rc;
ctx = kmalloc(sizeof(*ctx) + str_len, GFP_ATOMIC);
ctx = kmalloc(struct_size(ctx, ctx_str, str_len), GFP_ATOMIC);
if (!ctx) {
rc = -ENOMEM;
goto out;

16
security/smack/smack.h
View File

@ -389,22 +389,6 @@ static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
return tsp->smk_task;
}
static inline struct smack_known *smk_of_task_struct_subj(
const struct task_struct *t)
{
struct smack_known *skp;
const struct cred *cred;
rcu_read_lock();
cred = rcu_dereference(t->cred);
skp = smk_of_task(smack_cred(cred));
rcu_read_unlock();
return skp;
}
static inline struct smack_known *smk_of_task_struct_obj(
const struct task_struct *t)
{

9
security/smack/smack_lsm.c
View File

@ -2067,15 +2067,14 @@ static int smack_task_getsid(struct task_struct *p)
}
/**
* smack_task_getsecid_subj - get the subjective secid of the task
* @p: the task
* smack_current_getsecid_subj - get the subjective secid of the current task
* @secid: where to put the result
*
* Sets the secid to contain a u32 version of the task's subjective smack label.
*/
static void smack_task_getsecid_subj(struct task_struct *p, u32 *secid)
static void smack_current_getsecid_subj(u32 *secid)
{
struct smack_known *skp = smk_of_task_struct_subj(p);
struct smack_known *skp = smk_of_current();
*secid = skp->smk_secid;
}
@ -4807,7 +4806,7 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
LSM_HOOK_INIT(task_getsid, smack_task_getsid),
LSM_HOOK_INIT(task_getsecid_subj, smack_task_getsecid_subj),
LSM_HOOK_INIT(current_getsecid_subj, smack_current_getsecid_subj),
LSM_HOOK_INIT(task_getsecid_obj, smack_task_getsecid_obj),
LSM_HOOK_INIT(task_setnice, smack_task_setnice),
LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),