From 8931c3bdb3bfbdfb3c86f590f517ed9acfed27d7 Mon Sep 17 00:00:00 2001 From: Tetsuo Handa Date: Mon, 14 Nov 2016 20:16:12 +0900 Subject: [PATCH 1/7] SELinux: Use GFP_KERNEL for selinux_parse_opts_str(). Since selinux_parse_opts_str() is calling match_strdup() which uses GFP_KERNEL, it is safe to use GFP_KERNEL from kcalloc() which is called by selinux_parse_opts_str(). Signed-off-by: Tetsuo Handa Signed-off-by: Paul Moore --- security/selinux/hooks.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 09fd6108e421..d1b141e33ecb 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -1100,11 +1100,12 @@ static int selinux_parse_opts_str(char *options, } rc = -ENOMEM; - opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); + opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_KERNEL); if (!opts->mnt_opts) goto out_err; - opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); + opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), + GFP_KERNEL); if (!opts->mnt_opts_flags) { kfree(opts->mnt_opts); goto out_err; From 420591128cb206201dc444c2d42fb6f299b2ecd0 Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Thu, 10 Nov 2016 22:18:27 +0100 Subject: [PATCH 2/7] selinux: Minor cleanups Fix the comment for function __inode_security_revalidate, which returns an integer. Use the LABEL_* constants consistently for isec->initialized. Signed-off-by: Andreas Gruenbacher Signed-off-by: Paul Moore --- security/selinux/hooks.c | 3 ++- security/selinux/selinuxfs.c | 4 ++-- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index d1b141e33ecb..1c0721708ccc 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -237,6 +237,7 @@ static int inode_alloc_security(struct inode *inode) isec->sid = SECINITSID_UNLABELED; isec->sclass = SECCLASS_FILE; isec->task_sid = sid; + isec->initialized = LABEL_INVALID; inode->i_security = isec; return 0; @@ -247,7 +248,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent /* * Try reloading inode security labels that have been marked as invalid. The * @may_sleep parameter indicates when sleeping and thus reloading labels is - * allowed; when set to false, returns ERR_PTR(-ECHILD) when the label is + * allowed; when set to false, returns -ECHILD when the label is * invalid. The @opt_dentry parameter should be set to a dentry of the inode; * when no dentry is available, set it to NULL instead. */ diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 72c145dd799f..50fca204d3f1 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -1301,7 +1301,7 @@ static int sel_make_bools(void) goto out; isec->sid = sid; - isec->initialized = 1; + isec->initialized = LABEL_INITIALIZED; inode->i_fop = &sel_bool_ops; inode->i_ino = i|SEL_BOOL_INO_OFFSET; d_add(dentry, inode); @@ -1834,7 +1834,7 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) isec = (struct inode_security_struct *)inode->i_security; isec->sid = SECINITSID_DEVNULL; isec->sclass = SECCLASS_CHR_FILE; - isec->initialized = 1; + isec->initialized = LABEL_INITIALIZED; init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); d_add(dentry, inode); From db978da8fa1d0819b210c137d31a339149b88875 Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Thu, 10 Nov 2016 22:18:28 +0100 Subject: [PATCH 3/7] proc: Pass file mode to proc_pid_make_inode Pass the file mode of the proc inode to be created to proc_pid_make_inode. In proc_pid_make_inode, initialize inode->i_mode before calling security_task_to_inode. This allows selinux to set isec->sclass right away without introducing "half-initialized" inode security structs. Signed-off-by: Andreas Gruenbacher Signed-off-by: Paul Moore --- fs/proc/base.c | 23 +++++++++-------------- fs/proc/fd.c | 6 ++---- fs/proc/internal.h | 2 +- fs/proc/namespaces.c | 3 +-- security/selinux/hooks.c | 1 + 5 files changed, 14 insertions(+), 21 deletions(-) diff --git a/fs/proc/base.c b/fs/proc/base.c index 8e654468ab67..9de05e5854ef 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1663,7 +1663,8 @@ const struct inode_operations proc_pid_link_inode_operations = { /* building an inode */ -struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) +struct inode *proc_pid_make_inode(struct super_block * sb, + struct task_struct *task, umode_t mode) { struct inode * inode; struct proc_inode *ei; @@ -1677,6 +1678,7 @@ struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *t /* Common stuff */ ei = PROC_I(inode); + inode->i_mode = mode; inode->i_ino = get_next_ino(); inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); inode->i_op = &proc_def_inode_operations; @@ -2003,7 +2005,9 @@ proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, struct proc_inode *ei; struct inode *inode; - inode = proc_pid_make_inode(dir->i_sb, task); + inode = proc_pid_make_inode(dir->i_sb, task, S_IFLNK | + ((mode & FMODE_READ ) ? S_IRUSR : 0) | + ((mode & FMODE_WRITE) ? S_IWUSR : 0)); if (!inode) return -ENOENT; @@ -2012,12 +2016,6 @@ proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, inode->i_op = &proc_map_files_link_inode_operations; inode->i_size = 64; - inode->i_mode = S_IFLNK; - - if (mode & FMODE_READ) - inode->i_mode |= S_IRUSR; - if (mode & FMODE_WRITE) - inode->i_mode |= S_IWUSR; d_set_d_op(dentry, &tid_map_files_dentry_operations); d_add(dentry, inode); @@ -2371,12 +2369,11 @@ static int proc_pident_instantiate(struct inode *dir, struct inode *inode; struct proc_inode *ei; - inode = proc_pid_make_inode(dir->i_sb, task); + inode = proc_pid_make_inode(dir->i_sb, task, p->mode); if (!inode) goto out; ei = PROC_I(inode); - inode->i_mode = p->mode; if (S_ISDIR(inode->i_mode)) set_nlink(inode, 2); /* Use getattr to fix if necessary */ if (p->iop) @@ -3058,11 +3055,10 @@ static int proc_pid_instantiate(struct inode *dir, { struct inode *inode; - inode = proc_pid_make_inode(dir->i_sb, task); + inode = proc_pid_make_inode(dir->i_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); if (!inode) goto out; - inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; inode->i_op = &proc_tgid_base_inode_operations; inode->i_fop = &proc_tgid_base_operations; inode->i_flags|=S_IMMUTABLE; @@ -3351,11 +3347,10 @@ static int proc_task_instantiate(struct inode *dir, struct dentry *dentry, struct task_struct *task, const void *ptr) { struct inode *inode; - inode = proc_pid_make_inode(dir->i_sb, task); + inode = proc_pid_make_inode(dir->i_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); if (!inode) goto out; - inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; inode->i_op = &proc_tid_base_inode_operations; inode->i_fop = &proc_tid_base_operations; inode->i_flags|=S_IMMUTABLE; diff --git a/fs/proc/fd.c b/fs/proc/fd.c index d21dafef3102..4274f83bf100 100644 --- a/fs/proc/fd.c +++ b/fs/proc/fd.c @@ -183,14 +183,13 @@ proc_fd_instantiate(struct inode *dir, struct dentry *dentry, struct proc_inode *ei; struct inode *inode; - inode = proc_pid_make_inode(dir->i_sb, task); + inode = proc_pid_make_inode(dir->i_sb, task, S_IFLNK); if (!inode) goto out; ei = PROC_I(inode); ei->fd = fd; - inode->i_mode = S_IFLNK; inode->i_op = &proc_pid_link_inode_operations; inode->i_size = 64; @@ -322,14 +321,13 @@ proc_fdinfo_instantiate(struct inode *dir, struct dentry *dentry, struct proc_inode *ei; struct inode *inode; - inode = proc_pid_make_inode(dir->i_sb, task); + inode = proc_pid_make_inode(dir->i_sb, task, S_IFREG | S_IRUSR); if (!inode) goto out; ei = PROC_I(inode); ei->fd = fd; - inode->i_mode = S_IFREG | S_IRUSR; inode->i_fop = &proc_fdinfo_file_operations; d_set_d_op(dentry, &tid_fd_dentry_operations); diff --git a/fs/proc/internal.h b/fs/proc/internal.h index 5378441ec1b7..f4494dcbdc8b 100644 --- a/fs/proc/internal.h +++ b/fs/proc/internal.h @@ -162,7 +162,7 @@ extern int proc_pid_statm(struct seq_file *, struct pid_namespace *, extern const struct dentry_operations pid_dentry_operations; extern int pid_getattr(struct vfsmount *, struct dentry *, struct kstat *); extern int proc_setattr(struct dentry *, struct iattr *); -extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *); +extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t); extern int pid_revalidate(struct dentry *, unsigned int); extern int pid_delete_dentry(const struct dentry *); extern int proc_pid_readdir(struct file *, struct dir_context *); diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c index 51b8b0a8ad91..766f0c637ad1 100644 --- a/fs/proc/namespaces.c +++ b/fs/proc/namespaces.c @@ -92,12 +92,11 @@ static int proc_ns_instantiate(struct inode *dir, struct inode *inode; struct proc_inode *ei; - inode = proc_pid_make_inode(dir->i_sb, task); + inode = proc_pid_make_inode(dir->i_sb, task, S_IFLNK | S_IRWXUGO); if (!inode) goto out; ei = PROC_I(inode); - inode->i_mode = S_IFLNK|S_IRWXUGO; inode->i_op = &proc_ns_link_inode_operations; ei->ns_ops = ns_ops; diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 1c0721708ccc..32beac817bf5 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -3955,6 +3955,7 @@ static void selinux_task_to_inode(struct task_struct *p, struct inode_security_struct *isec = inode->i_security; u32 sid = task_sid(p); + isec->sclass = inode_mode_to_security_class(inode->i_mode); isec->sid = sid; isec->initialized = LABEL_INITIALIZED; } From 13457d073c29da92001f6ee809075eaa8757fb96 Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Thu, 10 Nov 2016 22:18:29 +0100 Subject: [PATCH 4/7] selinux: Clean up initialization of isec->sclass Now that isec->initialized == LABEL_INITIALIZED implies that isec->sclass is valid, skip such inodes immediately in inode_doinit_with_dentry. For the remaining inodes, initialize isec->sclass at the beginning of inode_doinit_with_dentry to simplify the code. Signed-off-by: Andreas Gruenbacher Signed-off-by: Paul Moore --- security/selinux/hooks.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 32beac817bf5..2a506861a772 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -1390,12 +1390,15 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent int rc = 0; if (isec->initialized == LABEL_INITIALIZED) - goto out; + return 0; mutex_lock(&isec->lock); if (isec->initialized == LABEL_INITIALIZED) goto out_unlock; + if (isec->sclass == SECCLASS_FILE) + isec->sclass = inode_mode_to_security_class(inode->i_mode); + sbsec = inode->i_sb->s_security; if (!(sbsec->flags & SE_SBINITIALIZED)) { /* Defer initialization until selinux_complete_init, @@ -1513,7 +1516,6 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent isec->sid = sbsec->sid; /* Try to obtain a transition SID. */ - isec->sclass = inode_mode_to_security_class(inode->i_mode); rc = security_transition_sid(isec->task_sid, sbsec->sid, isec->sclass, NULL, &sid); if (rc) @@ -1549,7 +1551,6 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent */ if (!dentry) goto out_unlock; - isec->sclass = inode_mode_to_security_class(inode->i_mode); rc = selinux_genfs_get_sid(dentry, isec->sclass, sbsec->flags, &sid); dput(dentry); @@ -1564,9 +1565,6 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent out_unlock: mutex_unlock(&isec->lock); -out: - if (isec->sclass == SECCLASS_FILE) - isec->sclass = inode_mode_to_security_class(inode->i_mode); return rc; } From ea49d10eee5a220b717dbf2ee429c9e3d59c978c Mon Sep 17 00:00:00 2001 From: Stephen Smalley Date: Fri, 18 Nov 2016 09:30:38 -0500 Subject: [PATCH 5/7] selinux: normalize input to /sys/fs/selinux/enforce At present, one can write any signed integer value to /sys/fs/selinux/enforce and it will be stored, e.g. echo -1 > /sys/fs/selinux/enforce or echo 2 > /sys/fs/selinux/enforce. This makes no real difference to the kernel, since it only ever cares if it is zero or non-zero, but some userspace code compares it with 1 to decide if SELinux is enforcing, and this could confuse it. Only a process that is already root and is allowed the setenforce permission in SELinux policy can write to /sys/fs/selinux/enforce, so this is not considered to be a security issue, but it should be fixed. Signed-off-by: Stephen Smalley Signed-off-by: Paul Moore --- security/selinux/selinuxfs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 50fca204d3f1..cf9293e01fc1 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -163,6 +163,8 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf, if (sscanf(page, "%d", &new_value) != 1) goto out; + new_value = !!new_value; + if (new_value != selinux_enforcing) { length = task_has_security(current, SECURITY__SETENFORCE); if (length) From 3322d0d64f4e942862a152f6f11137a1f5eac2e9 Mon Sep 17 00:00:00 2001 From: Stephen Smalley Date: Fri, 18 Nov 2016 10:23:09 -0500 Subject: [PATCH 6/7] selinux: keep SELinux in sync with new capability definitions When a new capability is defined, SELinux needs to be updated. Trigger a build error if a new capability is defined without corresponding update to security/selinux/include/classmap.h's COMMON_CAP2_PERMS. This is similar to BUILD_BUG_ON() guards in the SELinux nlmsgtab code to ensure that SELinux tracks new netlink message types as needed. Note that there is already a similar build guard in security/selinux/hooks.c to detect when more than 64 capabilities are defined, since that will require adding a third capability class to SELinux. A nicer way to do this would be to extend scripts/selinux/genheaders or a similar tool to auto-generate the necessary definitions and code for SELinux capability checking from include/uapi/linux/capability.h. AppArmor does something similar in its Makefile, although it only needs to generate a single table of names. That is left as future work. Signed-off-by: Stephen Smalley [PM: reformat the description to keep checkpatch.pl happy] Signed-off-by: Paul Moore --- security/selinux/include/classmap.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h index 1f1f4b2f6018..e2d4ad3a4b4c 100644 --- a/security/selinux/include/classmap.h +++ b/security/selinux/include/classmap.h @@ -24,6 +24,10 @@ #define COMMON_CAP2_PERMS "mac_override", "mac_admin", "syslog", \ "wake_alarm", "block_suspend", "audit_read" +#if CAP_LAST_CAP > CAP_AUDIT_READ +#error New capability defined, please update COMMON_CAP2_PERMS. +#endif + /* * Note: The name for any socket class should be suffixed by "socket", * and doesn't contain more than one substr of "socket". From 9287aed2ad1ff1bde5eb190bcd6dccd5f1cf47d3 Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Tue, 15 Nov 2016 11:06:40 +0100 Subject: [PATCH 7/7] selinux: Convert isec->lock into a spinlock Convert isec->lock from a mutex into a spinlock. Instead of holding the lock while sleeping in inode_doinit_with_dentry, set isec->initialized to LABEL_PENDING and release the lock. Then, when the sid has been determined, re-acquire the lock. If isec->initialized is still set to LABEL_PENDING, set isec->sid; otherwise, the sid has been set by another task (LABEL_INITIALIZED) or invalidated (LABEL_INVALID) in the meantime. This fixes a deadlock on gfs2 where * one task is in inode_doinit_with_dentry -> gfs2_getxattr, holds isec->lock, and tries to acquire the inode's glock, and * another task is in do_xmote -> inode_go_inval -> selinux_inode_invalidate_secctx, holds the inode's glock, and tries to acquire isec->lock. Signed-off-by: Andreas Gruenbacher [PM: minor tweaks to keep checkpatch.pl happy] Signed-off-by: Paul Moore --- security/selinux/hooks.c | 101 +++++++++++++++++++----------- security/selinux/include/objsec.h | 5 +- 2 files changed, 66 insertions(+), 40 deletions(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 2a506861a772..98a2e92b3168 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -231,7 +231,7 @@ static int inode_alloc_security(struct inode *inode) if (!isec) return -ENOMEM; - mutex_init(&isec->lock); + spin_lock_init(&isec->lock); INIT_LIST_HEAD(&isec->list); isec->inode = inode; isec->sid = SECINITSID_UNLABELED; @@ -1382,7 +1382,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent { struct superblock_security_struct *sbsec = NULL; struct inode_security_struct *isec = inode->i_security; - u32 sid; + u32 task_sid, sid = 0; + u16 sclass; struct dentry *dentry; #define INITCONTEXTLEN 255 char *context = NULL; @@ -1392,7 +1393,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent if (isec->initialized == LABEL_INITIALIZED) return 0; - mutex_lock(&isec->lock); + spin_lock(&isec->lock); if (isec->initialized == LABEL_INITIALIZED) goto out_unlock; @@ -1411,12 +1412,18 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent goto out_unlock; } + sclass = isec->sclass; + task_sid = isec->task_sid; + sid = isec->sid; + isec->initialized = LABEL_PENDING; + spin_unlock(&isec->lock); + switch (sbsec->behavior) { case SECURITY_FS_USE_NATIVE: break; case SECURITY_FS_USE_XATTR: if (!(inode->i_opflags & IOP_XATTR)) { - isec->sid = sbsec->def_sid; + sid = sbsec->def_sid; break; } /* Need a dentry, since the xattr API requires one. @@ -1438,7 +1445,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent * inode_doinit with a dentry, before these inodes could * be used again by userspace. */ - goto out_unlock; + goto out; } len = INITCONTEXTLEN; @@ -1446,7 +1453,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent if (!context) { rc = -ENOMEM; dput(dentry); - goto out_unlock; + goto out; } context[len] = '\0'; rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, context, len); @@ -1457,14 +1464,14 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, NULL, 0); if (rc < 0) { dput(dentry); - goto out_unlock; + goto out; } len = rc; context = kmalloc(len+1, GFP_NOFS); if (!context) { rc = -ENOMEM; dput(dentry); - goto out_unlock; + goto out; } context[len] = '\0'; rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, context, len); @@ -1476,7 +1483,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent "%d for dev=%s ino=%ld\n", __func__, -rc, inode->i_sb->s_id, inode->i_ino); kfree(context); - goto out_unlock; + goto out; } /* Map ENODATA to the default file SID */ sid = sbsec->def_sid; @@ -1506,28 +1513,25 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent } } kfree(context); - isec->sid = sid; break; case SECURITY_FS_USE_TASK: - isec->sid = isec->task_sid; + sid = task_sid; break; case SECURITY_FS_USE_TRANS: /* Default to the fs SID. */ - isec->sid = sbsec->sid; + sid = sbsec->sid; /* Try to obtain a transition SID. */ - rc = security_transition_sid(isec->task_sid, sbsec->sid, - isec->sclass, NULL, &sid); + rc = security_transition_sid(task_sid, sid, sclass, NULL, &sid); if (rc) - goto out_unlock; - isec->sid = sid; + goto out; break; case SECURITY_FS_USE_MNTPOINT: - isec->sid = sbsec->mntpoint_sid; + sid = sbsec->mntpoint_sid; break; default: /* Default to the fs superblock SID. */ - isec->sid = sbsec->sid; + sid = sbsec->sid; if ((sbsec->flags & SE_SBGENFS) && !S_ISLNK(inode->i_mode)) { /* We must have a dentry to determine the label on @@ -1550,21 +1554,30 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent * could be used again by userspace. */ if (!dentry) - goto out_unlock; - rc = selinux_genfs_get_sid(dentry, isec->sclass, + goto out; + rc = selinux_genfs_get_sid(dentry, sclass, sbsec->flags, &sid); dput(dentry); if (rc) - goto out_unlock; - isec->sid = sid; + goto out; } break; } - isec->initialized = LABEL_INITIALIZED; +out: + spin_lock(&isec->lock); + if (isec->initialized == LABEL_PENDING) { + if (!sid || rc) { + isec->initialized = LABEL_INVALID; + goto out_unlock; + } + + isec->initialized = LABEL_INITIALIZED; + isec->sid = sid; + } out_unlock: - mutex_unlock(&isec->lock); + spin_unlock(&isec->lock); return rc; } @@ -3195,9 +3208,11 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, } isec = backing_inode_security(dentry); + spin_lock(&isec->lock); isec->sclass = inode_mode_to_security_class(inode->i_mode); isec->sid = newsid; isec->initialized = LABEL_INITIALIZED; + spin_unlock(&isec->lock); return; } @@ -3290,9 +3305,11 @@ static int selinux_inode_setsecurity(struct inode *inode, const char *name, if (rc) return rc; + spin_lock(&isec->lock); isec->sclass = inode_mode_to_security_class(inode->i_mode); isec->sid = newsid; isec->initialized = LABEL_INITIALIZED; + spin_unlock(&isec->lock); return 0; } @@ -3953,9 +3970,11 @@ static void selinux_task_to_inode(struct task_struct *p, struct inode_security_struct *isec = inode->i_security; u32 sid = task_sid(p); + spin_lock(&isec->lock); isec->sclass = inode_mode_to_security_class(inode->i_mode); isec->sid = sid; isec->initialized = LABEL_INITIALIZED; + spin_unlock(&isec->lock); } /* Returns error only if unable to parse addresses */ @@ -4274,24 +4293,24 @@ static int selinux_socket_post_create(struct socket *sock, int family, const struct task_security_struct *tsec = current_security(); struct inode_security_struct *isec = inode_security_novalidate(SOCK_INODE(sock)); struct sk_security_struct *sksec; + u16 sclass = socket_type_to_security_class(family, type, protocol); + u32 sid = SECINITSID_KERNEL; int err = 0; - isec->sclass = socket_type_to_security_class(family, type, protocol); - - if (kern) - isec->sid = SECINITSID_KERNEL; - else { - err = socket_sockcreate_sid(tsec, isec->sclass, &(isec->sid)); + if (!kern) { + err = socket_sockcreate_sid(tsec, sclass, &sid); if (err) return err; } + isec->sclass = sclass; + isec->sid = sid; isec->initialized = LABEL_INITIALIZED; if (sock->sk) { sksec = sock->sk->sk_security; - sksec->sid = isec->sid; - sksec->sclass = isec->sclass; + sksec->sclass = sclass; + sksec->sid = sid; err = selinux_netlbl_socket_post_create(sock->sk, family); } @@ -4467,16 +4486,22 @@ static int selinux_socket_accept(struct socket *sock, struct socket *newsock) int err; struct inode_security_struct *isec; struct inode_security_struct *newisec; + u16 sclass; + u32 sid; err = sock_has_perm(current, sock->sk, SOCKET__ACCEPT); if (err) return err; - newisec = inode_security_novalidate(SOCK_INODE(newsock)); - isec = inode_security_novalidate(SOCK_INODE(sock)); - newisec->sclass = isec->sclass; - newisec->sid = isec->sid; + spin_lock(&isec->lock); + sclass = isec->sclass; + sid = isec->sid; + spin_unlock(&isec->lock); + + newisec = inode_security_novalidate(SOCK_INODE(newsock)); + newisec->sclass = sclass; + newisec->sid = sid; newisec->initialized = LABEL_INITIALIZED; return 0; @@ -5979,9 +6004,9 @@ static void selinux_inode_invalidate_secctx(struct inode *inode) { struct inode_security_struct *isec = inode->i_security; - mutex_lock(&isec->lock); + spin_lock(&isec->lock); isec->initialized = LABEL_INVALID; - mutex_unlock(&isec->lock); + spin_unlock(&isec->lock); } /* diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h index c21e135460a5..e8dab0f02c72 100644 --- a/security/selinux/include/objsec.h +++ b/security/selinux/include/objsec.h @@ -39,7 +39,8 @@ struct task_security_struct { enum label_initialized { LABEL_INVALID, /* invalid or not initialized */ - LABEL_INITIALIZED /* initialized */ + LABEL_INITIALIZED, /* initialized */ + LABEL_PENDING }; struct inode_security_struct { @@ -52,7 +53,7 @@ struct inode_security_struct { u32 sid; /* SID of this object */ u16 sclass; /* security class of this object */ unsigned char initialized; /* initialization flag */ - struct mutex lock; + spinlock_t lock; }; struct file_security_struct {