Merge branch 'next' into for-linus

12 files changed, 190 insertions, 71 deletions

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index b7c1603cd4bd..7c1e65d54872 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -501,22 +501,22 @@ static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
                 }
         }
 
-        /*
-         * Now fill out the bss section.  First pad the last page up
-         * to the page boundary, and then perform a mmap to make sure
-         * that there are zero-mapped pages up to and including the 
-         * last bss page.
-         */
-        if (padzero(elf_bss)) {
-                error = -EFAULT;
-                goto out_close;
-        }
+        if (last_bss > elf_bss) {
+                /*
+                 * Now fill out the bss section.  First pad the last page up
+                 * to the page boundary, and then perform a mmap to make sure
+                 * that there are zero-mapped pages up to and including the
+                 * last bss page.
+                 */
+                if (padzero(elf_bss)) {
+                        error = -EFAULT;
+                        goto out_close;
+                }
 
-        /* What we have mapped so far */
-        elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
+                /* What we have mapped so far */
+                elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
 
-        /* Map the last of the bss segment */
-        if (last_bss > elf_bss) {
+                /* Map the last of the bss segment */
                 down_write(&current->mm->mmap_sem);
                 error = do_brk(elf_bss, last_bss - elf_bss);
                 up_write(&current->mm->mmap_sem);
diff --git a/fs/locks.c b/fs/locks.c
index b6440f52178f..52366e877d76 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1591,7 +1591,7 @@ SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
         if (can_sleep)
                 lock->fl_flags |= FL_SLEEP;
 
-        error = security_file_lock(filp, cmd);
+        error = security_file_lock(filp, lock->fl_type);
         if (error)
                 goto out_free;
 
diff --git a/fs/namei.c b/fs/namei.c
index 1f13751693a5..fcfc5539252c 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1533,9 +1533,11 @@ int may_open(struct path *path, int acc_mode, int flag)
         if (error)
                 return error;
 
-        error = ima_path_check(path,
-                               acc_mode & (MAY_READ | MAY_WRITE | MAY_EXEC),
+        error = ima_path_check(path, acc_mode ?
+                               acc_mode & (MAY_READ | MAY_WRITE | MAY_EXEC) :
+                               ACC_MODE(flag) & (MAY_READ | MAY_WRITE),
                                IMA_COUNT_UPDATE);
+
         if (error)
                 return error;
         /*
diff --git a/fs/nfsd/auth.c b/fs/nfsd/auth.c
index 5573508f707f..36fcabbf5186 100644
--- a/fs/nfsd/auth.c
+++ b/fs/nfsd/auth.c
@@ -34,6 +34,8 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
         int flags = nfsexp_flags(rqstp, exp);
         int ret;
 
+        validate_process_creds();
+
         /* discard any old override before preparing the new set */
         revert_creds(get_cred(current->real_cred));
         new = prepare_creds();
@@ -86,8 +88,10 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
         else
                 new->cap_effective = cap_raise_nfsd_set(new->cap_effective,
                                                         new->cap_permitted);
+        validate_process_creds();
         put_cred(override_creds(new));
         put_cred(new);
+        validate_process_creds();
         return 0;
 
 oom:
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 492c79b7800b..24d58adfe5fd 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -496,7 +496,9 @@ nfsd(void *vrqstp)
                 /* Lock the export hash tables for reading. */
                 exp_readlock();
 
+                validate_process_creds();
                 svc_process(rqstp);
+                validate_process_creds();
 
                 /* Unlock export hash tables */
                 exp_readunlock();
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 23341c1063bc..8fa09bfbcba7 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -684,6 +684,8 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
         __be32          err;
         int             host_err;
 
+        validate_process_creds();
+
         /*
          * If we get here, then the client has already done an "open",
          * and (hopefully) checked permission - so allow OWNER_OVERRIDE
@@ -740,6 +742,7 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
 out_nfserr:
         err = nfserrno(host_err);
 out:
+        validate_process_creds();
         return err;
 }
 
diff --git a/fs/open.c b/fs/open.c
index dd98e8076024..31191bf513e4 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -199,7 +199,7 @@ out:
 int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
         struct file *filp)
 {
-        int err;
+        int ret;
         struct iattr newattrs;
 
         /* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */
@@ -214,12 +214,14 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
         }
 
         /* Remove suid/sgid on truncate too */
-        newattrs.ia_valid |= should_remove_suid(dentry);
+        ret = should_remove_suid(dentry);
+        if (ret)
+                newattrs.ia_valid |= ret | ATTR_FORCE;
 
         mutex_lock(&dentry->d_inode->i_mutex);
-        err = notify_change(dentry, &newattrs);
+        ret = notify_change(dentry, &newattrs);
         mutex_unlock(&dentry->d_inode->i_mutex);
-        return err;
+        return ret;
 }
 
 static long do_sys_truncate(const char __user *pathname, loff_t length)
@@ -957,6 +959,8 @@ struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags,
         int error;
         struct file *f;
 
+        validate_creds(cred);
+
         /*
          * We must always pass in a valid mount pointer.   Historically
          * callers got away with not passing it, but we must enforce this at
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 14f2d71ea3ce..0050fc40e8c9 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -760,6 +760,7 @@ static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
 const struct inode_operations sysfs_dir_inode_operations = {
         .lookup         = sysfs_lookup,
         .setattr        = sysfs_setattr,
+        .setxattr       = sysfs_setxattr,
 };
 
 static void remove_dir(struct sysfs_dirent *sd)
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index 555f0ff988df..2b6a8d9de73d 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -18,6 +18,8 @@
 #include <linux/capability.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
+#include <linux/xattr.h>
+#include <linux/security.h>
 #include "sysfs.h"
 
 extern struct super_block * sysfs_sb;
@@ -35,6 +37,7 @@ static struct backing_dev_info sysfs_backing_dev_info = {
 
 static const struct inode_operations sysfs_inode_operations ={
         .setattr        = sysfs_setattr,
+        .setxattr       = sysfs_setxattr,
 };
 
 int __init sysfs_inode_init(void)
@@ -42,18 +45,37 @@ int __init sysfs_inode_init(void)
         return bdi_init(&sysfs_backing_dev_info);
 }
 
+struct sysfs_inode_attrs *sysfs_init_inode_attrs(struct sysfs_dirent *sd)
+{
+        struct sysfs_inode_attrs *attrs;
+        struct iattr *iattrs;
+
+        attrs = kzalloc(sizeof(struct sysfs_inode_attrs), GFP_KERNEL);
+        if (!attrs)
+                return NULL;
+        iattrs = &attrs->ia_iattr;
+
+        /* assign default attributes */
+        iattrs->ia_mode = sd->s_mode;
+        iattrs->ia_uid = 0;
+        iattrs->ia_gid = 0;
+        iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME;
+
+        return attrs;
+}
 int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
 {
         struct inode * inode = dentry->d_inode;
         struct sysfs_dirent * sd = dentry->d_fsdata;
-        struct iattr * sd_iattr;
+        struct sysfs_inode_attrs *sd_attrs;
+        struct iattr *iattrs;
         unsigned int ia_valid = iattr->ia_valid;
         int error;
 
         if (!sd)
                 return -EINVAL;
 
-        sd_iattr = sd->s_iattr;
+        sd_attrs = sd->s_iattr;
 
         error = inode_change_ok(inode, iattr);
         if (error)
@@ -65,42 +87,77 @@ int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
         if (error)
                 return error;
 
-        if (!sd_iattr) {
+        if (!sd_attrs) {
                 /* setting attributes for the first time, allocate now */
-                sd_iattr = kzalloc(sizeof(struct iattr), GFP_KERNEL);
-                if (!sd_iattr)
+                sd_attrs = sysfs_init_inode_attrs(sd);
+                if (!sd_attrs)
                         return -ENOMEM;
-                /* assign default attributes */
-                sd_iattr->ia_mode = sd->s_mode;
-                sd_iattr->ia_uid = 0;
-                sd_iattr->ia_gid = 0;
-                sd_iattr->ia_atime = sd_iattr->ia_mtime = sd_iattr->ia_ctime = CURRENT_TIME;
-                sd->s_iattr = sd_iattr;
+                sd->s_iattr = sd_attrs;
+        } else {
+                /* attributes were changed at least once in past */
+                iattrs = &sd_attrs->ia_iattr;
+
+                if (ia_valid & ATTR_UID)
+                        iattrs->ia_uid = iattr->ia_uid;
+                if (ia_valid & ATTR_GID)
+                        iattrs->ia_gid = iattr->ia_gid;
+                if (ia_valid & ATTR_ATIME)
+                        iattrs->ia_atime = timespec_trunc(iattr->ia_atime,
+                                        inode->i_sb->s_time_gran);
+                if (ia_valid & ATTR_MTIME)
+                        iattrs->ia_mtime = timespec_trunc(iattr->ia_mtime,
+                                        inode->i_sb->s_time_gran);
+                if (ia_valid & ATTR_CTIME)
+                        iattrs->ia_ctime = timespec_trunc(iattr->ia_ctime,
+                                        inode->i_sb->s_time_gran);
+                if (ia_valid & ATTR_MODE) {
+                        umode_t mode = iattr->ia_mode;
+
+                        if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
+                                mode &= ~S_ISGID;
+                        iattrs->ia_mode = sd->s_mode = mode;
+                }
         }
+        return error;
+}
 
-        /* attributes were changed atleast once in past */
-
-        if (ia_valid & ATTR_UID)
-                sd_iattr->ia_uid = iattr->ia_uid;
-        if (ia_valid & ATTR_GID)
-                sd_iattr->ia_gid = iattr->ia_gid;
-        if (ia_valid & ATTR_ATIME)
-                sd_iattr->ia_atime = timespec_trunc(iattr->ia_atime,
-                                                inode->i_sb->s_time_gran);
-        if (ia_valid & ATTR_MTIME)
-                sd_iattr->ia_mtime = timespec_trunc(iattr->ia_mtime,
-                                                inode->i_sb->s_time_gran);
-        if (ia_valid & ATTR_CTIME)
-                sd_iattr->ia_ctime = timespec_trunc(iattr->ia_ctime,
-                                                inode->i_sb->s_time_gran);
-        if (ia_valid & ATTR_MODE) {
-                umode_t mode = iattr->ia_mode;
-
-                if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
-                        mode &= ~S_ISGID;
-                sd_iattr->ia_mode = sd->s_mode = mode;
-        }
+int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
+                size_t size, int flags)
+{
+        struct sysfs_dirent *sd = dentry->d_fsdata;
+        struct sysfs_inode_attrs *iattrs;
+        void *secdata;
+        int error;
+        u32 secdata_len = 0;
+
+        if (!sd)
+                return -EINVAL;
+        if (!sd->s_iattr)
+                sd->s_iattr = sysfs_init_inode_attrs(sd);
+        if (!sd->s_iattr)
+                return -ENOMEM;
+
+        iattrs = sd->s_iattr;
+
+        if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)) {
+                const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
+                error = security_inode_setsecurity(dentry->d_inode, suffix,
+                                                value, size, flags);
+                if (error)
+                        goto out;
+                error = security_inode_getsecctx(dentry->d_inode,
+                                                &secdata, &secdata_len);
+                if (error)
+                        goto out;
+                if (iattrs->ia_secdata)
+                        security_release_secctx(iattrs->ia_secdata,
+                                                iattrs->ia_secdata_len);
+                iattrs->ia_secdata = secdata;
+                iattrs->ia_secdata_len = secdata_len;
 
+        } else
+                return -EINVAL;
+out:
         return error;
 }
 
@@ -146,6 +203,7 @@ static int sysfs_count_nlink(struct sysfs_dirent *sd)
 static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
 {
         struct bin_attribute *bin_attr;
+        struct sysfs_inode_attrs *iattrs;
 
         inode->i_private = sysfs_get(sd);
         inode->i_mapping->a_ops = &sysfs_aops;
@@ -154,16 +212,20 @@ static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
         inode->i_ino = sd->s_ino;
         lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key);
 
-        if (sd->s_iattr) {
+        iattrs = sd->s_iattr;
+        if (iattrs) {
                 /* sysfs_dirent has non-default attributes
                  * get them for the new inode from persistent copy
                  * in sysfs_dirent
                  */
-                set_inode_attr(inode, sd->s_iattr);
+                set_inode_attr(inode, &iattrs->ia_iattr);
+                if (iattrs->ia_secdata)
+                        security_inode_notifysecctx(inode,
+                                                iattrs->ia_secdata,
+                                                iattrs->ia_secdata_len);
         } else
                 set_default_inode_attr(inode, sd->s_mode);
 
-
         /* initialize inode according to type */
         switch (sysfs_type(sd)) {
         case SYSFS_DIR:
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index 1d897ad808e0..c5081ad77026 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -16,6 +16,7 @@
 #include <linux/kobject.h>
 #include <linux/namei.h>
 #include <linux/mutex.h>
+#include <linux/security.h>
 
 #include "sysfs.h"
 
@@ -209,6 +210,7 @@ static void sysfs_put_link(struct dentry *dentry, struct nameidata *nd, void *co
 }
 
 const struct inode_operations sysfs_symlink_inode_operations = {
+        .setxattr = sysfs_setxattr,
         .readlink = generic_readlink,
         .follow_link = sysfs_follow_link,
         .put_link = sysfs_put_link,
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 3fa0d98481e2..af4c4e7482ac 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -8,6 +8,8 @@
  * This file is released under the GPLv2.
  */
 
+#include <linux/fs.h>
+
 struct sysfs_open_dirent;
 
 /* type-specific structures for sysfs_dirent->s_* union members */
@@ -31,6 +33,12 @@ struct sysfs_elem_bin_attr {
         struct hlist_head       buffers;
 };
 
+struct sysfs_inode_attrs {
+        struct iattr    ia_iattr;
+        void            *ia_secdata;
+        u32             ia_secdata_len;
+};
+
 /*
  * sysfs_dirent - the building block of sysfs hierarchy.  Each and
  * every sysfs node is represented by single sysfs_dirent.
@@ -56,7 +64,7 @@ struct sysfs_dirent {
         unsigned int            s_flags;
         ino_t                   s_ino;
         umode_t                 s_mode;
-        struct iattr            *s_iattr;
+        struct sysfs_inode_attrs *s_iattr;
 };
 
 #define SD_DEACTIVATED_BIAS             INT_MIN
@@ -148,6 +156,8 @@ static inline void __sysfs_put(struct sysfs_dirent *sd)
 struct inode *sysfs_get_inode(struct sysfs_dirent *sd);
 void sysfs_delete_inode(struct inode *inode);
 int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
+int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
+                size_t size, int flags);
 int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
 int sysfs_inode_init(void);
 
diff --git a/fs/xattr.c b/fs/xattr.c
index 1c3d0af59ddf..6d4f6d3449fb 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -66,22 +66,28 @@ xattr_permission(struct inode *inode, const char *name, int mask)
         return inode_permission(inode, mask);
 }
 
-int
-vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
-                size_t size, int flags)
+/**
+ *  __vfs_setxattr_noperm - perform setxattr operation without performing
+ *  permission checks.
+ *
+ *  @dentry - object to perform setxattr on
+ *  @name - xattr name to set
+ *  @value - value to set @name to
+ *  @size - size of @value
+ *  @flags - flags to pass into filesystem operations
+ *
+ *  returns the result of the internal setxattr or setsecurity operations.
+ *
+ *  This function requires the caller to lock the inode's i_mutex before it
+ *  is executed. It also assumes that the caller will make the appropriate
+ *  permission checks.
+ */
+int __vfs_setxattr_noperm(struct dentry *dentry, const char *name,
+                const void *value, size_t size, int flags)
 {
         struct inode *inode = dentry->d_inode;
-        int error;
-
-        error = xattr_permission(inode, name, MAY_WRITE);
-        if (error)
-                return error;
+        int error = -EOPNOTSUPP;
 
-        mutex_lock(&inode->i_mutex);
-        error = security_inode_setxattr(dentry, name, value, size, flags);
-        if (error)
-                goto out;
-        error = -EOPNOTSUPP;
         if (inode->i_op->setxattr) {
                 error = inode->i_op->setxattr(dentry, name, value, size, flags);
                 if (!error) {
@@ -97,6 +103,29 @@ vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
                 if (!error)
                         fsnotify_xattr(dentry);
         }
+
+        return error;
+}
+
+
+int
+vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
+                size_t size, int flags)
+{
+        struct inode *inode = dentry->d_inode;
+        int error;
+
+        error = xattr_permission(inode, name, MAY_WRITE);
+        if (error)
+                return error;
+
+        mutex_lock(&inode->i_mutex);
+        error = security_inode_setxattr(dentry, name, value, size, flags);
+        if (error)
+                goto out;
+
+        error = __vfs_setxattr_noperm(dentry, name, value, size, flags);
+
 out:
         mutex_unlock(&inode->i_mutex);
         return error;