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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

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Pull security subsystem updates from James Morris:
 "Highlights:

   - A new LSM, "LoadPin", from Kees Cook is added, which allows forcing
     of modules and firmware to be loaded from a specific device (this
     is from ChromeOS, where the device as a whole is verified
     cryptographically via dm-verity).

     This is disabled by default but can be configured to be enabled by
     default (don't do this if you don't know what you're doing).

   - Keys: allow authentication data to be stored in an asymmetric key.
     Lots of general fixes and updates.

   - SELinux: add restrictions for loading of kernel modules via
     finit_module().  Distinguish non-init user namespace capability
     checks.  Apply execstack check on thread stacks"

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (48 commits)
  LSM: LoadPin: provide enablement CONFIG
  Yama: use atomic allocations when reporting
  seccomp: Fix comment typo
  ima: add support for creating files using the mknodat syscall
  ima: fix ima_inode_post_setattr
  vfs: forbid write access when reading a file into memory
  fs: fix over-zealous use of "const"
  selinux: apply execstack check on thread stacks
  selinux: distinguish non-init user namespace capability checks
  LSM: LoadPin for kernel file loading restrictions
  fs: define a string representation of the kernel_read_file_id enumeration
  Yama: consolidate error reporting
  string_helpers: add kstrdup_quotable_file
  string_helpers: add kstrdup_quotable_cmdline
  string_helpers: add kstrdup_quotable
  selinux: check ss_initialized before revalidating an inode label
  selinux: delay inode label lookup as long as possible
  selinux: don't revalidate an inode's label when explicitly setting it
  selinux: Change bool variable name to index.
  KEYS: Add KEYCTL_DH_COMPUTE command
  ...
This commit is contained in:
Linus Torvalds 2016-05-19 09:21:36 -07:00
commit f4f27d0028
82 changed files with 1915 additions and 807 deletions
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29
fs/exec.c
View file

@ -850,15 +850,25 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size,
if (ret)
return ret;
ret = deny_write_access(file);
if (ret)
return ret;
i_size = i_size_read(file_inode(file));
if (max_size > 0 && i_size > max_size)
return -EFBIG;
if (i_size <= 0)
return -EINVAL;
if (max_size > 0 && i_size > max_size) {
ret = -EFBIG;
goto out;
}
if (i_size <= 0) {
ret = -EINVAL;
goto out;
}
*buf = vmalloc(i_size);
if (!*buf)
return -ENOMEM;
if (!*buf) {
ret = -ENOMEM;
goto out;
}
pos = 0;
while (pos < i_size) {
@ -876,18 +886,21 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size,
if (pos != i_size) {
ret = -EIO;
goto out;
goto out_free;
}
ret = security_kernel_post_read_file(file, *buf, i_size, id);
if (!ret)
*size = pos;
out:
out_free:
if (ret < 0) {
vfree(*buf);
*buf = NULL;
}
out:
allow_write_access(file);
return ret;
}
EXPORT_SYMBOL_GPL(kernel_read_file);