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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-02 20:25:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-02 20:25:04 -0700
commitaab174f0df5d72d31caccf281af5f614fa254578 (patch)
tree2a172c5009c4ac8755e858593154c258ce7709a0 /security
parentca41cc96b2813221b05af57d0355157924de5a07 (diff)
parent2bd2c1941f141ad780135ccc1cd08ca71a24f10a (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs update from Al Viro: - big one - consolidation of descriptor-related logics; almost all of that is moved to fs/file.c (BTW, I'm seriously tempted to rename the result to fd.c. As it is, we have a situation when file_table.c is about handling of struct file and file.c is about handling of descriptor tables; the reasons are historical - file_table.c used to be about a static array of struct file we used to have way back). A lot of stray ends got cleaned up and converted to saner primitives, disgusting mess in android/binder.c is still disgusting, but at least doesn't poke so much in descriptor table guts anymore. A bunch of relatively minor races got fixed in process, plus an ext4 struct file leak. - related thing - fget_light() partially unuglified; see fdget() in there (and yes, it generates the code as good as we used to have). - also related - bits of Cyrill's procfs stuff that got entangled into that work; _not_ all of it, just the initial move to fs/proc/fd.c and switch of fdinfo to seq_file. - Alex's fs/coredump.c spiltoff - the same story, had been easier to take that commit than mess with conflicts. The rest is a separate pile, this was just a mechanical code movement. - a few misc patches all over the place. Not all for this cycle, there'll be more (and quite a few currently sit in akpm's tree)." Fix up trivial conflicts in the android binder driver, and some fairly simple conflicts due to two different changes to the sock_alloc_file() interface ("take descriptor handling from sock_alloc_file() to callers" vs "net: Providing protocol type via system.sockprotoname xattr of /proc/PID/fd entries" adding a dentry name to the socket) * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (72 commits) MAX_LFS_FILESIZE should be a loff_t compat: fs: Generic compat_sys_sendfile implementation fs: push rcu_barrier() from deactivate_locked_super() to filesystems btrfs: reada_extent doesn't need kref for refcount coredump: move core dump functionality into its own file coredump: prevent double-free on an error path in core dumper usb/gadget: fix misannotations fcntl: fix misannotations ceph: don't abuse d_delete() on failure exits hypfs: ->d_parent is never NULL or negative vfs: delete surplus inode NULL check switch simple cases of fget_light to fdget new helpers: fdget()/fdput() switch o2hb_region_dev_write() to fget_light() proc_map_files_readdir(): don't bother with grabbing files make get_file() return its argument vhost_set_vring(): turn pollstart/pollstop into bool switch prctl_set_mm_exe_file() to fget_light() switch xfs_find_handle() to fget_light() switch xfs_swapext() to fget_light() ...
Diffstat (limited to 'security')
-rw-r--r--security/selinux/hooks.c73
1 files changed, 21 insertions, 52 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 6c77f63c759..651d8456611 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2088,15 +2088,19 @@ static int selinux_bprm_secureexec(struct linux_binprm *bprm)
return (atsecure || cap_bprm_secureexec(bprm));
}
+static int match_file(const void *p, struct file *file, unsigned fd)
+{
+ return file_has_perm(p, file, file_to_av(file)) ? fd + 1 : 0;
+}
+
/* Derived from fs/exec.c:flush_old_files. */
static inline void flush_unauthorized_files(const struct cred *cred,
struct files_struct *files)
{
struct file *file, *devnull = NULL;
struct tty_struct *tty;
- struct fdtable *fdt;
- long j = -1;
int drop_tty = 0;
+ unsigned n;
tty = get_current_tty();
if (tty) {
@@ -2123,58 +2127,23 @@ static inline void flush_unauthorized_files(const struct cred *cred,
no_tty();
/* Revalidate access to inherited open files. */
- spin_lock(&files->file_lock);
- for (;;) {
- unsigned long set, i;
- int fd;
-
- j++;
- i = j * BITS_PER_LONG;
- fdt = files_fdtable(files);
- if (i >= fdt->max_fds)
- break;
- set = fdt->open_fds[j];
- if (!set)
- continue;
- spin_unlock(&files->file_lock);
- for ( ; set ; i++, set >>= 1) {
- if (set & 1) {
- file = fget(i);
- if (!file)
- continue;
- if (file_has_perm(cred,
- file,
- file_to_av(file))) {
- sys_close(i);
- fd = get_unused_fd();
- if (fd != i) {
- if (fd >= 0)
- put_unused_fd(fd);
- fput(file);
- continue;
- }
- if (devnull) {
- get_file(devnull);
- } else {
- devnull = dentry_open(
- &selinux_null,
- O_RDWR, cred);
- if (IS_ERR(devnull)) {
- devnull = NULL;
- put_unused_fd(fd);
- fput(file);
- continue;
- }
- }
- fd_install(fd, devnull);
- }
- fput(file);
- }
- }
- spin_lock(&files->file_lock);
+ n = iterate_fd(files, 0, match_file, cred);
+ if (!n) /* none found? */
+ return;
+ devnull = dentry_open(&selinux_null, O_RDWR, cred);
+ if (!IS_ERR(devnull)) {
+ /* replace all the matching ones with this */
+ do {
+ replace_fd(n - 1, get_file(devnull), 0);
+ } while ((n = iterate_fd(files, n, match_file, cred)) != 0);
+ fput(devnull);
+ } else {
+ /* just close all the matching ones */
+ do {
+ replace_fd(n - 1, NULL, 0);
+ } while ((n = iterate_fd(files, n, match_file, cred)) != 0);
}
- spin_unlock(&files->file_lock);
}
/*