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

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Pull smack updates from James Morris:
 "Two Smack patches for 4.21.

  Jose's patch adds missing documentation and Zoran's fleshes out the
  access checks on keyrings"

* 'next-smack' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  Smack: Improve Documentation
  smack: fix access permissions for keyring
This commit is contained in:
Linus Torvalds 2019-01-02 10:56:09 -08:00
commit 19f2e267a5
2 changed files with 13 additions and 3 deletions
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4
Documentation/admin-guide/LSM/Smack.rst
View File

@ -818,6 +818,10 @@ Smack supports some mount options:
specifies a label to which all labels set on the
filesystem must have read access. Not yet enforced.
smackfstransmute=label:
behaves exactly like smackfsroot except that it also
sets the transmute flag on the root of the mount
These mount options apply to all file system types.
Smack auditing

12
security/smack/smack_lsm.c
View File

@ -4333,6 +4333,12 @@ static int smack_key_permission(key_ref_t key_ref,
int request = 0;
int rc;
/*
* Validate requested permissions
*/
if (perm & ~KEY_NEED_ALL)
return -EINVAL;
keyp = key_ref_to_ptr(key_ref);
if (keyp == NULL)
return -EINVAL;
@ -4356,10 +4362,10 @@ static int smack_key_permission(key_ref_t key_ref,
ad.a.u.key_struct.key = keyp->serial;
ad.a.u.key_struct.key_desc = keyp->description;
#endif
if (perm & KEY_NEED_READ)
request = MAY_READ;
if (perm & (KEY_NEED_READ | KEY_NEED_SEARCH | KEY_NEED_VIEW))
request |= MAY_READ;
if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
request = MAY_WRITE;
request |= MAY_WRITE;
rc = smk_access(tkp, keyp->security, request, &ad);
rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
return rc;