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SubjectRe: [PATCH ghak21 V2 2/4] audit: link denied should not directly generate PATH record
On Mon, Mar 12, 2018 at 2:31 AM, Richard Guy Briggs <rgb@redhat.com> wrote:
> Audit link denied events generate duplicate PATH records which disagree
> in different ways from symlink and hardlink denials.
> audit_log_link_denied() should not directly generate PATH records.
> While we're at it, remove the now useless struct path argument.
>
> See: https://github.com/linux-audit/audit-kernel/issues/21
> Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
> ---
> fs/namei.c | 2 +-
> include/linux/audit.h | 6 ++----
> kernel/audit.c | 17 ++---------------
> 3 files changed, 5 insertions(+), 20 deletions(-)

I have no objection to the v2 change of removing the link parameter,
but this patch can not be merged as-is because the v1 patch has
already been merged into audit/next (as stated on the mailing list).
You need to respin this patch against audit/next and redo the
subject/description to indicate that you are just removing the unused
link parameter in this updated patch.

> diff --git a/fs/namei.c b/fs/namei.c
> index 9cc91fb..50d2533 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -1011,7 +1011,7 @@ static int may_linkat(struct path *link)
> if (safe_hardlink_source(inode) || inode_owner_or_capable(inode))
> return 0;
>
> - audit_log_link_denied("linkat", link);
> + audit_log_link_denied("linkat");
> return -EPERM;
> }
>
> diff --git a/include/linux/audit.h b/include/linux/audit.h
> index af410d9..75d5b03 100644
> --- a/include/linux/audit.h
> +++ b/include/linux/audit.h
> @@ -146,8 +146,7 @@ extern void audit_log_d_path(struct audit_buffer *ab,
> const struct path *path);
> extern void audit_log_key(struct audit_buffer *ab,
> char *key);
> -extern void audit_log_link_denied(const char *operation,
> - const struct path *link);
> +extern void audit_log_link_denied(const char *operation);
> extern void audit_log_lost(const char *message);
>
> extern int audit_log_task_context(struct audit_buffer *ab);
> @@ -194,8 +193,7 @@ static inline void audit_log_d_path(struct audit_buffer *ab,
> { }
> static inline void audit_log_key(struct audit_buffer *ab, char *key)
> { }
> -static inline void audit_log_link_denied(const char *string,
> - const struct path *link)
> +static inline void audit_log_link_denied(const char *string)
> { }
> static inline int audit_log_task_context(struct audit_buffer *ab)
> {
> diff --git a/kernel/audit.c b/kernel/audit.c
> index 7026d69..e54deaf 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -2301,36 +2301,23 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
> /**
> * audit_log_link_denied - report a link restriction denial
> * @operation: specific link operation
> - * @link: the path that triggered the restriction
> */
> -void audit_log_link_denied(const char *operation, const struct path *link)
> +void audit_log_link_denied(const char *operation)
> {
> struct audit_buffer *ab;
> - struct audit_names *name;
>
> if (!audit_enabled || audit_dummy_context())
> return;
>
> - name = kzalloc(sizeof(*name), GFP_NOFS);
> - if (!name)
> - return;
> -
> /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
> ab = audit_log_start(current->audit_context, GFP_KERNEL,
> AUDIT_ANOM_LINK);
> if (!ab)
> - goto out;
> + return;
> audit_log_format(ab, "op=%s", operation);
> audit_log_task_info(ab, current);
> audit_log_format(ab, " res=0");
> audit_log_end(ab);
> -
> - /* Generate AUDIT_PATH record with object. */
> - name->type = AUDIT_TYPE_NORMAL;
> - audit_copy_inode(name, link->dentry, d_backing_inode(link->dentry));
> - audit_log_name(current->audit_context, name, link, 0, NULL);
> -out:
> - kfree(name);
> }
>
> /**
> --
> 1.8.3.1
>



--
paul moore
www.paul-moore.com

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