From 0092699643703aefca6af0aa758a73f1624d53be Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Wed, 28 Oct 2009 19:50:57 +0100 Subject: Driver Core: devtmpfs: ignore umask while setting file mode Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- drivers/base/devtmpfs.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) (limited to 'drivers/base/devtmpfs.c') diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index a1cb5afe680..48526b93568 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -156,34 +156,40 @@ int devtmpfs_create_node(struct device *dev) mode |= S_IFCHR; curr_cred = override_creds(&init_cred); + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, nodename, LOOKUP_PARENT, &nd); if (err == -ENOENT) { - /* create missing parent directories */ create_path(nodename); err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, nodename, LOOKUP_PARENT, &nd); - if (err) - goto out; } + if (err) + goto out; dentry = lookup_create(&nd, 0); if (!IS_ERR(dentry)) { - int umask; - - umask = sys_umask(0000); err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, dev->devt); - sys_umask(umask); - /* mark as kernel created inode */ - if (!err) + if (!err) { + struct iattr newattrs; + + /* fixup possibly umasked mode */ + newattrs.ia_mode = mode; + newattrs.ia_valid = ATTR_MODE; + mutex_lock(&dentry->d_inode->i_mutex); + notify_change(dentry, &newattrs); + mutex_unlock(&dentry->d_inode->i_mutex); + + /* mark as kernel-created inode */ dentry->d_inode->i_private = &dev_mnt; + } dput(dentry); } else { err = PTR_ERR(dentry); } - mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); path_put(&nd.path); out: kfree(tmp); -- cgit v1.2.3-70-g09d2 From ed413ae6e7813d3227eef43bc6d84ca4f4fe6b21 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Wed, 28 Oct 2009 19:51:06 +0100 Subject: Driver core: devtmpfs: prevent concurrent subdirectory creation and removal Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- drivers/base/devtmpfs.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) (limited to 'drivers/base/devtmpfs.c') diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index 48526b93568..1cf498fd2b5 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -32,6 +32,8 @@ static int dev_mount = 1; static int dev_mount; #endif +static rwlock_t dirlock; + static int __init mount_param(char *str) { dev_mount = simple_strtoul(str, NULL, 0); @@ -86,16 +88,12 @@ static int dev_mkdir(const char *name, mode_t mode) static int create_path(const char *nodepath) { - char *path; struct nameidata nd; int err = 0; - path = kstrdup(nodepath, GFP_KERNEL); - if (!path) - return -ENOMEM; - + read_lock(&dirlock); err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, - path, LOOKUP_PARENT, &nd); + nodepath, LOOKUP_PARENT, &nd); if (err == 0) { struct dentry *dentry; @@ -107,14 +105,17 @@ static int create_path(const char *nodepath) dput(dentry); } mutex_unlock(&nd.path.dentry->d_inode->i_mutex); - path_put(&nd.path); } else if (err == -ENOENT) { + char *path; char *s; /* parent directories do not exist, create them */ + path = kstrdup(nodepath, GFP_KERNEL); + if (!path) + return -ENOMEM; s = path; - while (1) { + for (;;) { s = strchr(s, '/'); if (!s) break; @@ -125,9 +126,10 @@ static int create_path(const char *nodepath) s[0] = '/'; s++; } + kfree(path); } + read_unlock(&dirlock); - kfree(path); return err; } @@ -234,7 +236,8 @@ static int delete_path(const char *nodepath) if (!path) return -ENOMEM; - while (1) { + write_lock(&dirlock); + for (;;) { char *base; base = strrchr(path, '/'); @@ -245,6 +248,7 @@ static int delete_path(const char *nodepath) if (err) break; } + write_unlock(&dirlock); kfree(path); return err; @@ -360,6 +364,8 @@ int __init devtmpfs_init(void) int err; struct vfsmount *mnt; + rwlock_init(&dirlock); + err = register_filesystem(&dev_fs_type); if (err) { printk(KERN_ERR "devtmpfs: unable to register devtmpfs " -- cgit v1.2.3-70-g09d2 From 073120cc28ad9f6003452c8bb9d15a87b1820201 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Wed, 28 Oct 2009 19:51:17 +0100 Subject: Driver Core: devtmpfs: use sys_mount() Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- drivers/base/devtmpfs.c | 9 ++------- include/linux/device.h | 2 +- 2 files changed, 3 insertions(+), 8 deletions(-) (limited to 'drivers/base/devtmpfs.c') diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index 1cf498fd2b5..880a203b668 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -332,9 +332,8 @@ out: * If configured, or requested by the commandline, devtmpfs will be * auto-mounted after the kernel mounted the root filesystem. */ -int devtmpfs_mount(const char *mountpoint) +int devtmpfs_mount(const char *mntdir) { - struct path path; int err; if (!dev_mount) @@ -343,15 +342,11 @@ int devtmpfs_mount(const char *mountpoint) if (!dev_mnt) return 0; - err = kern_path(mountpoint, LOOKUP_FOLLOW, &path); - if (err) - return err; - err = do_add_mount(dev_mnt, &path, 0, NULL); + err = sys_mount("devtmpfs", (char *)mntdir, "devtmpfs", MS_SILENT, NULL); if (err) printk(KERN_INFO "devtmpfs: error mounting %i\n", err); else printk(KERN_INFO "devtmpfs: mounted\n"); - path_put(&path); return err; } diff --git a/include/linux/device.h b/include/linux/device.h index 2ea3e492181..2a73d9bcbc9 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -558,7 +558,7 @@ extern void wait_for_device_probe(void); #ifdef CONFIG_DEVTMPFS extern int devtmpfs_create_node(struct device *dev); extern int devtmpfs_delete_node(struct device *dev); -extern int devtmpfs_mount(const char *mountpoint); +extern int devtmpfs_mount(const char *mntdir); #else static inline int devtmpfs_create_node(struct device *dev) { return 0; } static inline int devtmpfs_delete_node(struct device *dev) { return 0; } -- cgit v1.2.3-70-g09d2 From 015bf43b07158668c2f38af463939afcc6d19403 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Wed, 28 Oct 2009 19:51:26 +0100 Subject: Driver Core: devtmpfs: do not remove non-kernel-created directories Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- drivers/base/devtmpfs.c | 39 ++++++++++++++++----------------------- 1 file changed, 16 insertions(+), 23 deletions(-) (limited to 'drivers/base/devtmpfs.c') diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index 880a203b668..c7f5c08f879 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -76,37 +76,26 @@ static int dev_mkdir(const char *name, mode_t mode) dentry = lookup_create(&nd, 1); if (!IS_ERR(dentry)) { err = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode); + if (!err) + /* mark as kernel-created inode */ + dentry->d_inode->i_private = &dev_mnt; dput(dentry); } else { err = PTR_ERR(dentry); } - mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); path_put(&nd.path); return err; } static int create_path(const char *nodepath) { - struct nameidata nd; - int err = 0; + int err; read_lock(&dirlock); - err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, - nodepath, LOOKUP_PARENT, &nd); - if (err == 0) { - struct dentry *dentry; - - /* create directory right away */ - dentry = lookup_create(&nd, 1); - if (!IS_ERR(dentry)) { - err = vfs_mkdir(nd.path.dentry->d_inode, - dentry, 0755); - dput(dentry); - } - mutex_unlock(&nd.path.dentry->d_inode->i_mutex); - path_put(&nd.path); - } else if (err == -ENOENT) { + err = dev_mkdir(nodepath, 0755); + if (err == -ENOENT) { char *path; char *s; @@ -129,7 +118,6 @@ static int create_path(const char *nodepath) kfree(path); } read_unlock(&dirlock); - return err; } @@ -213,16 +201,21 @@ static int dev_rmdir(const char *name) mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len); if (!IS_ERR(dentry)) { - if (dentry->d_inode) - err = vfs_rmdir(nd.path.dentry->d_inode, dentry); - else + if (dentry->d_inode) { + if (dentry->d_inode->i_private == &dev_mnt) + err = vfs_rmdir(nd.path.dentry->d_inode, + dentry); + else + err = -EPERM; + } else { err = -ENOENT; + } dput(dentry); } else { err = PTR_ERR(dentry); } - mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); path_put(&nd.path); return err; } -- cgit v1.2.3-70-g09d2 From 03d673e6af6490371aaf64dfe1f84c658c48b71d Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Fri, 30 Oct 2009 12:48:32 +0100 Subject: Driver-Core: devtmpfs - set root directory mode to 0755 Signed-off-by: Kay Sievers Cc: Mark Rosenstand Signed-off-by: Greg Kroah-Hartman --- drivers/base/devtmpfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/base/devtmpfs.c') diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index c7f5c08f879..50375bb8e51 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -361,7 +361,7 @@ int __init devtmpfs_init(void) return err; } - mnt = kern_mount(&dev_fs_type); + mnt = kern_mount_data(&dev_fs_type, "mode=0755"); if (IS_ERR(mnt)) { err = PTR_ERR(mnt); printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err); -- cgit v1.2.3-70-g09d2