Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6: (105 commits)
  SELinux: don't check permissions for kernel mounts
  security: pass mount flags to security_sb_kern_mount()
  SELinux: correctly detect proc filesystems of the form "proc/foo"
  Audit: Log TIOCSTI
  user namespaces: document CFS behavior
  user namespaces: require cap_set{ug}id for CLONE_NEWUSER
  user namespaces: let user_ns be cloned with fairsched
  CRED: fix sparse warnings
  User namespaces: use the current_user_ns() macro
  User namespaces: set of cleanups (v2)
  nfsctl: add headers for credentials
  coda: fix creds reference
  capabilities: define get_vfs_caps_from_disk when file caps are not enabled
  CRED: Allow kernel services to override LSM settings for task actions
  CRED: Add a kernel_service object class to SELinux
  CRED: Differentiate objective and effective subjective credentials on a task
  CRED: Documentation
  CRED: Use creds in file structs
  CRED: Prettify commoncap.c
  CRED: Make execve() take advantage of copy-on-write credentials
  ...

17 files changed, 79 insertions, 62 deletions

diff --git a/arch/alpha/kernel/asm-offsets.c b/arch/alpha/kernel/asm-offsets.c
index 4b18cd94d59..6ff8886e7e2 100644
--- a/arch/alpha/kernel/asm-offsets.c
+++ b/arch/alpha/kernel/asm-offsets.c
@@ -19,15 +19,18 @@ void foo(void)
 	BLANK();
 
         DEFINE(TASK_BLOCKED, offsetof(struct task_struct, blocked));
-        DEFINE(TASK_UID, offsetof(struct task_struct, uid));
-        DEFINE(TASK_EUID, offsetof(struct task_struct, euid));
-        DEFINE(TASK_GID, offsetof(struct task_struct, gid));
-        DEFINE(TASK_EGID, offsetof(struct task_struct, egid));
+        DEFINE(TASK_CRED, offsetof(struct task_struct, cred));
         DEFINE(TASK_REAL_PARENT, offsetof(struct task_struct, real_parent));
         DEFINE(TASK_GROUP_LEADER, offsetof(struct task_struct, group_leader));
         DEFINE(TASK_TGID, offsetof(struct task_struct, tgid));
         BLANK();
 
+        DEFINE(CRED_UID,  offsetof(struct cred, uid));
+        DEFINE(CRED_EUID, offsetof(struct cred, euid));
+        DEFINE(CRED_GID,  offsetof(struct cred, gid));
+        DEFINE(CRED_EGID, offsetof(struct cred, egid));
+        BLANK();
+
 	DEFINE(SIZEOF_PT_REGS, sizeof(struct pt_regs));
 	DEFINE(PT_PTRACED, PT_PTRACED);
 	DEFINE(CLONE_VM, CLONE_VM);
diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
index 5fc61e281ac..f77345bc66a 100644
--- a/arch/alpha/kernel/entry.S
+++ b/arch/alpha/kernel/entry.S
@@ -850,8 +850,9 @@ osf_getpriority:
 sys_getxuid:
 	.prologue 0
 	ldq	$2, TI_TASK($8)
-	ldl	$0, TASK_UID($2)
-	ldl	$1, TASK_EUID($2)
+	ldq	$3, TASK_CRED($2)
+	ldl	$0, CRED_UID($3)
+	ldl	$1, CRED_EUID($3)
 	stq	$1, 80($sp)
 	ret
 .end sys_getxuid
@@ -862,8 +863,9 @@ sys_getxuid:
 sys_getxgid:
 	.prologue 0
 	ldq	$2, TI_TASK($8)
-	ldl	$0, TASK_GID($2)
-	ldl	$1, TASK_EGID($2)
+	ldq	$3, TASK_CRED($2)
+	ldl	$0, CRED_GID($3)
+	ldl	$1, CRED_EGID($3)
 	stq	$1, 80($sp)
 	ret
 .end sys_getxgid
diff --git a/arch/ia64/ia32/sys_ia32.c b/arch/ia64/ia32/sys_ia32.c
index 5e92ae00bdb..16ef61a91d9 100644
--- a/arch/ia64/ia32/sys_ia32.c
+++ b/arch/ia64/ia32/sys_ia32.c
@@ -1767,25 +1767,24 @@ groups16_from_user(struct group_info *group_info, short __user *grouplist)
 asmlinkage long
 sys32_getgroups16 (int gidsetsize, short __user *grouplist)
 {
+	const struct cred *cred = current_cred();
 	int i;
 
 	if (gidsetsize < 0)
 		return -EINVAL;
 
-	get_group_info(current->group_info);
-	i = current->group_info->ngroups;
+	i = cred->group_info->ngroups;
 	if (gidsetsize) {
 		if (i > gidsetsize) {
 			i = -EINVAL;
 			goto out;
 		}
-		if (groups16_to_user(grouplist, current->group_info)) {
+		if (groups16_to_user(grouplist, cred->group_info)) {
 			i = -EFAULT;
 			goto out;
 		}
 	}
 out:
-	put_group_info(current->group_info);
 	return i;
 }
 
diff --git a/arch/ia64/kernel/mca_drv.c b/arch/ia64/kernel/mca_drv.c
index fab1d21a4f2..f94aaa86933 100644
--- a/arch/ia64/kernel/mca_drv.c
+++ b/arch/ia64/kernel/mca_drv.c
@@ -158,7 +158,7 @@ mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr)
 	ia64_mlogbuf_dump();
 	printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, "
 		"iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n",
-		raw_smp_processor_id(), current->pid, current->uid,
+	       raw_smp_processor_id(), current->pid, current_uid(),
 		iip, ipsr, paddr, current->comm);
 
 	spin_lock(&mca_bh_lock);
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 6543a5547c8..0e499757309 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -2220,8 +2220,8 @@ pfm_alloc_file(pfm_context_t *ctx)
 	DPRINT(("new inode ino=%ld @%p\n", inode->i_ino, inode));
 
 	inode->i_mode = S_IFCHR|S_IRUGO;
-	inode->i_uid  = current->fsuid;
-	inode->i_gid  = current->fsgid;
+	inode->i_uid  = current_fsuid();
+	inode->i_gid  = current_fsgid();
 
 	sprintf(name, "[%lu]", inode->i_ino);
 	this.name = name;
@@ -2399,22 +2399,33 @@ error_kmem:
 static int
 pfm_bad_permissions(struct task_struct *task)
 {
+	const struct cred *tcred;
+	uid_t uid = current_uid();
+	gid_t gid = current_gid();
+	int ret;
+
+	rcu_read_lock();
+	tcred = __task_cred(task);
+
 	/* inspired by ptrace_attach() */
 	DPRINT(("cur: uid=%d gid=%d task: euid=%d suid=%d uid=%d egid=%d sgid=%d\n",
-		current->uid,
-		current->gid,
-		task->euid,
-		task->suid,
-		task->uid,
-		task->egid,
-		task->sgid));
-
-	return ((current->uid != task->euid)
-	    || (current->uid != task->suid)
-	    || (current->uid != task->uid)
-	    || (current->gid != task->egid)
-	    || (current->gid != task->sgid)
-	    || (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE);
+		uid,
+		gid,
+		tcred->euid,
+		tcred->suid,
+		tcred->uid,
+		tcred->egid,
+		tcred->sgid));
+
+	ret = ((uid != tcred->euid)
+	       || (uid != tcred->suid)
+	       || (uid != tcred->uid)
+	       || (gid != tcred->egid)
+	       || (gid != tcred->sgid)
+	       || (gid != tcred->gid)) && !capable(CAP_SYS_PTRACE);
+
+	rcu_read_unlock();
+	return ret;
 }
 
 static int
diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
index e12500a9c44..e1821ca4c7d 100644
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -229,7 +229,7 @@ ia64_rt_sigreturn (struct sigscratch *scr)
 	si.si_errno = 0;
 	si.si_code = SI_KERNEL;
 	si.si_pid = task_pid_vnr(current);
-	si.si_uid = current->uid;
+	si.si_uid = current_uid();
 	si.si_addr = sc;
 	force_sig_info(SIGSEGV, &si, current);
 	return retval;
@@ -326,7 +326,7 @@ force_sigsegv_info (int sig, void __user *addr)
 	si.si_errno = 0;
 	si.si_code = SI_KERNEL;
 	si.si_pid = task_pid_vnr(current);
-	si.si_uid = current->uid;
+	si.si_uid = current_uid();
 	si.si_addr = addr;
 	force_sig_info(SIGSEGV, &si, current);
 	return 0;
diff --git a/arch/mips/kernel/kspd.c b/arch/mips/kernel/kspd.c
index b0591ae0ce5..fd6e5122403 100644
--- a/arch/mips/kernel/kspd.c
+++ b/arch/mips/kernel/kspd.c
@@ -174,8 +174,8 @@ static unsigned int translate_open_flags(int flags)
 
 static void sp_setfsuidgid( uid_t uid, gid_t gid)
 {
-	current->fsuid = uid;
-	current->fsgid = gid;
+	current->cred->fsuid = uid;
+	current->cred->fsgid = gid;
 
 	key_fsuid_changed(current);
 	key_fsgid_changed(current);
diff --git a/arch/mips/kernel/mips-mt-fpaff.c b/arch/mips/kernel/mips-mt-fpaff.c
index dc9eb72ed9d..5e77a3a21f9 100644
--- a/arch/mips/kernel/mips-mt-fpaff.c
+++ b/arch/mips/kernel/mips-mt-fpaff.c
@@ -51,6 +51,7 @@ asmlinkage long mipsmt_sys_sched_setaffinity(pid_t pid, unsigned int len,
 	int retval;
 	struct task_struct *p;
 	struct thread_info *ti;
+	uid_t euid;
 
 	if (len < sizeof(new_mask))
 		return -EINVAL;
@@ -76,9 +77,9 @@ asmlinkage long mipsmt_sys_sched_setaffinity(pid_t pid, unsigned int len,
 	 */
 	get_task_struct(p);
 
+	euid = current_euid();
 	retval = -EPERM;
-	if ((current->euid != p->euid) && (current->euid != p->uid) &&
-			!capable(CAP_SYS_NICE)) {
+	if (euid != p->euid && euid != p->uid && !capable(CAP_SYS_NICE)) {
 		read_unlock(&tasklist_lock);
 		goto out_unlock;
 	}
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index a1b3da6bad5..010b27e01f7 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -1085,8 +1085,8 @@ static int vpe_open(struct inode *inode, struct file *filp)
 	v->load_addr = NULL;
 	v->len = 0;
 
-	v->uid = filp->f_uid;
-	v->gid = filp->f_gid;
+	v->uid = filp->f_cred->fsuid;
+	v->gid = filp->f_cred->fsgid;
 
 #ifdef CONFIG_MIPS_APSP_KSPD
 	/* get kspd to tell us when a syscall_exit happens */
diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 06213d1d6d9..f82544225e8 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -182,7 +182,7 @@ give_sigsegv:
 	si.si_errno = 0;
 	si.si_code = SI_KERNEL;
 	si.si_pid = task_pid_vnr(current);
-	si.si_uid = current->uid;
+	si.si_uid = current_uid();
 	si.si_addr = &frame->uc;
 	force_sig_info(SIGSEGV, &si, current);
 	return;
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 565b7a237c8..866098686da 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -339,7 +339,7 @@ bad_area_nosemaphore:
 	    && printk_ratelimit())
 		printk(KERN_CRIT "kernel tried to execute NX-protected"
 		       " page (%lx) - exploit attempt? (uid: %d)\n",
-		       address, current->uid);
+		       address, current_uid());
 
 	return SIGSEGV;
 
diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index cb85d237e49..6296bfd9cb0 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c
@@ -95,8 +95,8 @@ spufs_new_inode(struct super_block *sb, int mode)
 		goto out;
 
 	inode->i_mode = mode;
-	inode->i_uid = current->fsuid;
-	inode->i_gid = current->fsgid;
+	inode->i_uid = current_fsuid();
+	inode->i_gid = current_fsgid();
 	inode->i_blocks = 0;
 	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 out:
@@ -323,7 +323,7 @@ static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
 		goto out;
 	}
 
-	filp = dentry_open(dentry, mnt, O_RDONLY);
+	filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 	if (IS_ERR(filp)) {
 		put_unused_fd(ret);
 		ret = PTR_ERR(filp);
@@ -562,7 +562,7 @@ static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 		goto out;
 	}
 
-	filp = dentry_open(dentry, mnt, O_RDONLY);
+	filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 	if (IS_ERR(filp)) {
 		put_unused_fd(ret);
 		ret = PTR_ERR(filp);
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index 36313801cd5..8aadcd7a7cf 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -280,8 +280,8 @@ static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
 	if (!sbi)
 		return -ENOMEM;
 	mutex_init(&sbi->lock);
-	sbi->uid = current->uid;
-	sbi->gid = current->gid;
+	sbi->uid = current_uid();
+	sbi->gid = current_gid();
 	sb->s_fs_info = sbi;
 	sb->s_blocksize = PAGE_CACHE_SIZE;
 	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
index 4646382af34..6cc87d8c868 100644
--- a/arch/s390/kernel/compat_linux.c
+++ b/arch/s390/kernel/compat_linux.c
@@ -148,9 +148,9 @@ asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user
 {
 	int retval;
 
-	if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
-	    !(retval = put_user(high2lowuid(current->euid), euid)))
-		retval = put_user(high2lowuid(current->suid), suid);
+	if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
+	    !(retval = put_user(high2lowuid(current->cred->euid), euid)))
+		retval = put_user(high2lowuid(current->cred->suid), suid);
 
 	return retval;
 }
@@ -165,9 +165,9 @@ asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user
 {
 	int retval;
 
-	if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
-	    !(retval = put_user(high2lowgid(current->egid), egid)))
-		retval = put_user(high2lowgid(current->sgid), sgid);
+	if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
+	    !(retval = put_user(high2lowgid(current->cred->egid), egid)))
+		retval = put_user(high2lowgid(current->cred->sgid), sgid);
 
 	return retval;
 }
@@ -217,20 +217,20 @@ asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
 	if (gidsetsize < 0)
 		return -EINVAL;
 
-	get_group_info(current->group_info);
-	i = current->group_info->ngroups;
+	get_group_info(current->cred->group_info);
+	i = current->cred->group_info->ngroups;
 	if (gidsetsize) {
 		if (i > gidsetsize) {
 			i = -EINVAL;
 			goto out;
 		}
-		if (groups16_to_user(grouplist, current->group_info)) {
+		if (groups16_to_user(grouplist, current->cred->group_info)) {
 			i = -EFAULT;
 			goto out;
 		}
 	}
 out:
-	put_group_info(current->group_info);
+	put_group_info(current->cred->group_info);
 	return i;
 }
 
@@ -261,22 +261,22 @@ asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
 
 asmlinkage long sys32_getuid16(void)
 {
-	return high2lowuid(current->uid);
+	return high2lowuid(current->cred->uid);
 }
 
 asmlinkage long sys32_geteuid16(void)
 {
-	return high2lowuid(current->euid);
+	return high2lowuid(current->cred->euid);
 }
 
 asmlinkage long sys32_getgid16(void)
 {
-	return high2lowgid(current->gid);
+	return high2lowgid(current->cred->gid);
 }
 
 asmlinkage long sys32_getegid16(void)
 {
-	return high2lowgid(current->egid);
+	return high2lowgid(current->cred->egid);
 }
 
 /*
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 8f44ebb0dec..e14629c87de 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -161,7 +161,8 @@ void mconsole_proc(struct mc_request *req)
 		goto out_kill;
 	}
 
-	file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY);
+	file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY,
+			   current_cred());
 	if (IS_ERR(file)) {
 		mconsole_reply(req, "Failed to open file", 1, 0);
 		goto out_kill;
diff --git a/arch/x86/ia32/ia32_aout.c b/arch/x86/ia32/ia32_aout.c
index 127ec3f0721..2a4d073d2cf 100644
--- a/arch/x86/ia32/ia32_aout.c
+++ b/arch/x86/ia32/ia32_aout.c
@@ -327,7 +327,7 @@ static int load_aout_binary(struct linux_binprm *bprm, struct pt_regs *regs)
 	current->mm->cached_hole_size = 0;
 
 	current->mm->mmap = NULL;
-	compute_creds(bprm);
+	install_exec_creds(bprm);
 	current->flags &= ~PF_FORKNOEXEC;
 
 	if (N_MAGIC(ex) == OMAGIC) {
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 31e8730fa24..3a1b6ef4f05 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -393,7 +393,7 @@ static void show_fault_oops(struct pt_regs *regs, unsigned long error_code,
 		if (pte && pte_present(*pte) && !pte_exec(*pte))
 			printk(KERN_CRIT "kernel tried to execute "
 				"NX-protected page - exploit attempt? "
-				"(uid: %d)\n", current->uid);
+				"(uid: %d)\n", current_uid());
 	}
 #endif