On 12/03/2007 07:39 PM, Casey Schaufler wrote:
> From: Casey Schaufler <[email protected]>
>
> Clean out unnecessary mutex initializations for Smack list locks.
> Once this is done, there is no need for them to be shared among
> multiple files, so pull them out of the header file and put them
> in the files where they belong.
Then it might be static.
> Pull unnecessary locking from smack_inode_setsecurity, it used
> to be required when the assignment was not guaranteed to be a
> scalar value but isn't now.
>
> Change uses of __capable(current,...) to capable(...).
> Take out an inappropriate cast. Use container_of() instead
> of doing the same calculation by hand.
> Fix comment spelling errors.
Too many different changes according to the name of the patch.
> Signed-off-by: Casey Schaufler <[email protected]>
>
> ---
>
> Tested with stamp-2007-11-30-16-39
>
> security/smack/smack.h | 3 --
> security/smack/smack_access.c | 3 ++
> security/smack/smack_lsm.c | 34 +++++++++-----------------------
> security/smack/smackfs.c | 6 +++++
> 4 files changed, 19 insertions(+), 27 deletions(-)
>
> diff -uprN -X linux-2.6.24-rc3-mm2-base/Documentation/dontdiff linux-2.6.24-rc3-mm2-base/security/smack/smack_lsm.c linux-2.6.24-rc3-mm2-smack/security/smack/smack_lsm.c
> --- linux-2.6.24-rc3-mm2-base/security/smack/smack_lsm.c 2007-11-27 16:47:05.000000000 -0800
> +++ linux-2.6.24-rc3-mm2-smack/security/smack/smack_lsm.c 2007-11-28 11:46:13.000000000 -0800
[...]
> @@ -748,9 +746,7 @@ static int smack_inode_setsecurity(struc
> return -EINVAL;
>
> if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
> - mutex_lock(&nsp->smk_lock);
> nsp->smk_inode = sp;
> - mutex_unlock(&nsp->smk_lock);
> return 0;
> }
> /*
Ok, it still might be atomic as a variable change, but it will break scenarios
such as
mutex_lock(&nsp->smk_lock);
create(nsp->smk_inode);
cook_a_dinner();
get_info(nsp->smk_inode);
mutex_unlock(&nsp->smk_lock);
While cook_a_dinner(), smack_inode_setsecurity() is called and the attribute
changed...
Doesn't this matter?
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