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-rw-r--r--security/seclvl.c4
-rw-r--r--security/selinux/hooks.c101
-rw-r--r--security/selinux/include/objsec.h8
3 files changed, 29 insertions, 84 deletions
diff --git a/security/seclvl.c b/security/seclvl.c
index 1caac01..8529ea6 100644
--- a/security/seclvl.c
+++ b/security/seclvl.c
@@ -368,8 +368,8 @@ static int seclvl_capable(struct task_struct *tsk, int cap)
*/
static int seclvl_settime(struct timespec *tv, struct timezone *tz)
{
- struct timespec now;
- if (seclvl > 1) {
+ if (tv && seclvl > 1) {
+ struct timespec now;
now = current_kernel_time();
if (tv->tv_sec < now.tv_sec ||
(tv->tv_sec == now.tv_sec && tv->tv_nsec < now.tv_nsec)) {
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index b9f8d97..4ae834d 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -127,7 +127,6 @@ static int task_alloc_security(struct task_struct *task)
if (!tsec)
return -ENOMEM;
- tsec->magic = SELINUX_MAGIC;
tsec->task = task;
tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED;
task->security = tsec;
@@ -138,10 +137,6 @@ static int task_alloc_security(struct task_struct *task)
static void task_free_security(struct task_struct *task)
{
struct task_security_struct *tsec = task->security;
-
- if (!tsec || tsec->magic != SELINUX_MAGIC)
- return;
-
task->security = NULL;
kfree(tsec);
}
@@ -157,14 +152,10 @@ static int inode_alloc_security(struct inode *inode)
init_MUTEX(&isec->sem);
INIT_LIST_HEAD(&isec->list);
- isec->magic = SELINUX_MAGIC;
isec->inode = inode;
isec->sid = SECINITSID_UNLABELED;
isec->sclass = SECCLASS_FILE;
- if (tsec && tsec->magic == SELINUX_MAGIC)
- isec->task_sid = tsec->sid;
- else
- isec->task_sid = SECINITSID_UNLABELED;
+ isec->task_sid = tsec->sid;
inode->i_security = isec;
return 0;
@@ -175,9 +166,6 @@ static void inode_free_security(struct inode *inode)
struct inode_security_struct *isec = inode->i_security;
struct superblock_security_struct *sbsec = inode->i_sb->s_security;
- if (!isec || isec->magic != SELINUX_MAGIC)
- return;
-
spin_lock(&sbsec->isec_lock);
if (!list_empty(&isec->list))
list_del_init(&isec->list);
@@ -192,19 +180,13 @@ static int file_alloc_security(struct file *file)
struct task_security_struct *tsec = current->security;
struct file_security_struct *fsec;
- fsec = kzalloc(sizeof(struct file_security_struct), GFP_ATOMIC);
+ fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL);
if (!fsec)
return -ENOMEM;
- fsec->magic = SELINUX_MAGIC;
fsec->file = file;
- if (tsec && tsec->magic == SELINUX_MAGIC) {
- fsec->sid = tsec->sid;
- fsec->fown_sid = tsec->sid;
- } else {
- fsec->sid = SECINITSID_UNLABELED;
- fsec->fown_sid = SECINITSID_UNLABELED;
- }
+ fsec->sid = tsec->sid;
+ fsec->fown_sid = tsec->sid;
file->f_security = fsec;
return 0;
@@ -213,10 +195,6 @@ static int file_alloc_security(struct file *file)
static void file_free_security(struct file *file)
{
struct file_security_struct *fsec = file->f_security;
-
- if (!fsec || fsec->magic != SELINUX_MAGIC)
- return;
-
file->f_security = NULL;
kfree(fsec);
}
@@ -233,7 +211,6 @@ static int superblock_alloc_security(struct super_block *sb)
INIT_LIST_HEAD(&sbsec->list);
INIT_LIST_HEAD(&sbsec->isec_head);
spin_lock_init(&sbsec->isec_lock);
- sbsec->magic = SELINUX_MAGIC;
sbsec->sb = sb;
sbsec->sid = SECINITSID_UNLABELED;
sbsec->def_sid = SECINITSID_FILE;
@@ -246,9 +223,6 @@ static void superblock_free_security(struct super_block *sb)
{
struct superblock_security_struct *sbsec = sb->s_security;
- if (!sbsec || sbsec->magic != SELINUX_MAGIC)
- return;
-
spin_lock(&sb_security_lock);
if (!list_empty(&sbsec->list))
list_del_init(&sbsec->list);
@@ -270,7 +244,6 @@ static int sk_alloc_security(struct sock *sk, int family, gfp_t priority)
if (!ssec)
return -ENOMEM;
- ssec->magic = SELINUX_MAGIC;
ssec->sk = sk;
ssec->peer_sid = SECINITSID_UNLABELED;
sk->sk_security = ssec;
@@ -282,7 +255,7 @@ static void sk_free_security(struct sock *sk)
{
struct sk_security_struct *ssec = sk->sk_security;
- if (sk->sk_family != PF_UNIX || ssec->magic != SELINUX_MAGIC)
+ if (sk->sk_family != PF_UNIX)
return;
sk->sk_security = NULL;
@@ -1483,7 +1456,6 @@ static int selinux_bprm_alloc_security(struct linux_binprm *bprm)
if (!bsec)
return -ENOMEM;
- bsec->magic = SELINUX_MAGIC;
bsec->bprm = bprm;
bsec->sid = SECINITSID_UNLABELED;
bsec->set = 0;
@@ -2454,35 +2426,27 @@ static int selinux_file_mprotect(struct vm_area_struct *vma,
prot = reqprot;
#ifndef CONFIG_PPC32
- if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXECUTABLE) &&
- (vma->vm_start >= vma->vm_mm->start_brk &&
- vma->vm_end <= vma->vm_mm->brk)) {
- /*
- * We are making an executable mapping in the brk region.
- * This has an additional execheap check.
- */
- rc = task_has_perm(current, current, PROCESS__EXECHEAP);
- if (rc)
- return rc;
- }
- if (vma->vm_file != NULL && vma->anon_vma != NULL && (prot & PROT_EXEC)) {
- /*
- * We are making executable a file mapping that has
- * had some COW done. Since pages might have been written,
- * check ability to execute the possibly modified content.
- * This typically should only occur for text relocations.
- */
- int rc = file_has_perm(current, vma->vm_file, FILE__EXECMOD);
- if (rc)
- return rc;
- }
- if (!vma->vm_file && (prot & PROT_EXEC) &&
- vma->vm_start <= vma->vm_mm->start_stack &&
- vma->vm_end >= vma->vm_mm->start_stack) {
- /* Attempt to make the process stack executable.
- * This has an additional execstack check.
- */
- rc = task_has_perm(current, current, PROCESS__EXECSTACK);
+ if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
+ rc = 0;
+ if (vma->vm_start >= vma->vm_mm->start_brk &&
+ vma->vm_end <= vma->vm_mm->brk) {
+ rc = task_has_perm(current, current,
+ PROCESS__EXECHEAP);
+ } else if (!vma->vm_file &&
+ vma->vm_start <= vma->vm_mm->start_stack &&
+ vma->vm_end >= vma->vm_mm->start_stack) {
+ rc = task_has_perm(current, current, PROCESS__EXECSTACK);
+ } else if (vma->vm_file && vma->anon_vma) {
+ /*
+ * We are making executable a file mapping that has
+ * had some COW done. Since pages might have been
+ * written, check ability to execute the possibly
+ * modified content. This typically should only
+ * occur for text relocations.
+ */
+ rc = file_has_perm(current, vma->vm_file,
+ FILE__EXECMOD);
+ }
if (rc)
return rc;
}
@@ -3642,14 +3606,9 @@ static int ipc_alloc_security(struct task_struct *task,
if (!isec)
return -ENOMEM;
- isec->magic = SELINUX_MAGIC;
isec->sclass = sclass;
isec->ipc_perm = perm;
- if (tsec) {
- isec->sid = tsec->sid;
- } else {
- isec->sid = SECINITSID_UNLABELED;
- }
+ isec->sid = tsec->sid;
perm->security = isec;
return 0;
@@ -3658,9 +3617,6 @@ static int ipc_alloc_security(struct task_struct *task,
static void ipc_free_security(struct kern_ipc_perm *perm)
{
struct ipc_security_struct *isec = perm->security;
- if (!isec || isec->magic != SELINUX_MAGIC)
- return;
-
perm->security = NULL;
kfree(isec);
}
@@ -3673,7 +3629,6 @@ static int msg_msg_alloc_security(struct msg_msg *msg)
if (!msec)
return -ENOMEM;
- msec->magic = SELINUX_MAGIC;
msec->msg = msg;
msec->sid = SECINITSID_UNLABELED;
msg->security = msec;
@@ -3684,8 +3639,6 @@ static int msg_msg_alloc_security(struct msg_msg *msg)
static void msg_msg_free_security(struct msg_msg *msg)
{
struct msg_security_struct *msec = msg->security;
- if (!msec || msec->magic != SELINUX_MAGIC)
- return;
msg->security = NULL;
kfree(msec);
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index 887937c..54c0307 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -27,7 +27,6 @@
#include "avc.h"
struct task_security_struct {
- unsigned long magic; /* magic number for this module */
struct task_struct *task; /* back pointer to task object */
u32 osid; /* SID prior to last execve */
u32 sid; /* current SID */
@@ -37,7 +36,6 @@ struct task_security_struct {
};
struct inode_security_struct {
- unsigned long magic; /* magic number for this module */
struct inode *inode; /* back pointer to inode object */
struct list_head list; /* list of inode_security_struct */
u32 task_sid; /* SID of creating task */
@@ -49,14 +47,12 @@ struct inode_security_struct {
};
struct file_security_struct {
- unsigned long magic; /* magic number for this module */
struct file *file; /* back pointer to file object */
u32 sid; /* SID of open file description */
u32 fown_sid; /* SID of file owner (for SIGIO) */
};
struct superblock_security_struct {
- unsigned long magic; /* magic number for this module */
struct super_block *sb; /* back pointer to sb object */
struct list_head list; /* list of superblock_security_struct */
u32 sid; /* SID of file system */
@@ -70,20 +66,17 @@ struct superblock_security_struct {
};
struct msg_security_struct {
- unsigned long magic; /* magic number for this module */
struct msg_msg *msg; /* back pointer */
u32 sid; /* SID of message */
};
struct ipc_security_struct {
- unsigned long magic; /* magic number for this module */
struct kern_ipc_perm *ipc_perm; /* back pointer */
u16 sclass; /* security class of this object */
u32 sid; /* SID of IPC resource */
};
struct bprm_security_struct {
- unsigned long magic; /* magic number for this module */
struct linux_binprm *bprm; /* back pointer to bprm object */
u32 sid; /* SID for transformed process */
unsigned char set;
@@ -102,7 +95,6 @@ struct netif_security_struct {
};
struct sk_security_struct {
- unsigned long magic; /* magic number for this module */
struct sock *sk; /* back pointer to sk object */
u32 peer_sid; /* SID of peer */
};
generated by cgit v1.1 at 2025-08-20 10:04:13 +0000