diff options
| author | Kees Cook | 2012-10-16 07:32:07 +1030 |
|---|---|---|
| committer | Rusty Russell | 2012-12-14 13:05:24 +1030 |
| commit | 2e72d51b4ac32989496870cd8171b3682fea1839 (patch) | |
| tree | b8190d17aa5d59508f8c979ce0160f21bef89500 /kernel | |
| parent | 2f3238aebedb243804f58d62d57244edec4149b2 (diff) | |
security: introduce kernel_module_from_file hook
Now that kernel module origins can be reasoned about, provide a hook to
the LSMs to make policy decisions about the module file. This will let
Chrome OS enforce that loadable kernel modules can only come from its
read-only hash-verified root filesystem. Other LSMs can, for example,
read extended attributes for signatures, etc.
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Acked-by: Eric Paris <eparis@redhat.com>
Acked-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/module.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/module.c b/kernel/module.c index 1395ca382fb5..a1d2ed8bab93 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -29,6 +29,7 @@ #include <linux/vmalloc.h> #include <linux/elf.h> #include <linux/proc_fs.h> +#include <linux/security.h> #include <linux/seq_file.h> #include <linux/syscalls.h> #include <linux/fcntl.h> @@ -2485,10 +2486,16 @@ static int elf_header_check(struct load_info *info) static int copy_module_from_user(const void __user *umod, unsigned long len, struct load_info *info) { + int err; + info->len = len; if (info->len < sizeof(*(info->hdr))) return -ENOEXEC; + err = security_kernel_module_from_file(NULL); + if (err) + return err; + /* Suck in entire file: we'll want most of it. */ info->hdr = vmalloc(info->len); if (!info->hdr) @@ -2515,6 +2522,10 @@ static int copy_module_from_fd(int fd, struct load_info *info) if (!file) return -ENOEXEC; + err = security_kernel_module_from_file(file); + if (err) + goto out; + err = vfs_getattr(file->f_vfsmnt, file->f_dentry, &stat); if (err) goto out; |