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SubjectRe: [PATCH v4 12/15] smack: Remove redundant pdeath_signal clearing
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On 7/31/2017 4:51 PM, Kees Cook wrote:
> This removes the redundant pdeath_signal clearing in Smack: the check in
> smack_bprm_committing_creds() matches the check in smack_bprm_set_creds()
> (which used to be in the now-removed smack_bprm_securexec() hook) and
> since secureexec is now being checked for clearing pdeath_signal, this
> is redundant to the common exec code.
>
> Cc: Casey Schaufler <casey@schaufler-ca.com>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> Acked-by: Serge Hallyn <serge@hallyn.com>

Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>

> ---
> security/smack/smack_lsm.c | 15 ---------------
> 1 file changed, 15 deletions(-)
>
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index 4f1967be3d20..4e33c650b224 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -957,20 +957,6 @@ static int smack_bprm_set_creds(struct linux_binprm *bprm)
> return 0;
> }
>
> -/**
> - * smack_bprm_committing_creds - Prepare to install the new credentials
> - * from bprm.
> - *
> - * @bprm: binprm for exec
> - */
> -static void smack_bprm_committing_creds(struct linux_binprm *bprm)
> -{
> - struct task_smack *bsp = bprm->cred->security;
> -
> - if (bsp->smk_task != bsp->smk_forked)
> - current->pdeath_signal = 0;
> -}
> -
> /*
> * Inode hooks
> */
> @@ -4633,7 +4619,6 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
> LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
>
> LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
> - LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds),
>
> LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
> LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),

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