Re: [RFC] [PATCH] audit: log module name on init_module

On Tue, Jan 31, 2017 at 3:02 PM, Richard Guy Briggs <rgb(a)redhat.com&gt; wrote: > On 2017-01-31 11:07, Paul Moore wrote: >> On Tue, Jan 31, 2017 at 7:36 AM, Richard Guy Briggs <rgb(a)redhat.com&gt; wrote: >> > On 2017-01-31 06:59, Paul Moore wrote: >> >> On Thu, Jan 26, 2017 at 4:21 PM, Richard Guy Briggs <rgb(a)redhat.com&gt; wrote: >> >> > This adds a new auxiliary record MODULE_INIT to the SYSCALL event. >> >> > >> >> > We get finit_module for free since it made most sense to hook this in to >> >> > load_module(). >> >> > >> >> > https://github.com/linux-audit/audit-kernel/issues/7 >> >> > https://github.com/linux-audit/audit-kernel/wiki/RFE-Module-load-record-f... >> >> >> >> Consistency nit: capitalize the first letter in the wiki page words >> >> (see the existing RFE pages) >> >> >> >> > Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com&gt; >> >> > --- >> >> > include/linux/audit.h | 12 ++++++++++++ >> >> > include/uapi/linux/audit.h | 1 + >> >> > kernel/audit.h | 3 +++ >> >> > kernel/auditsc.c | 20 ++++++++++++++++++++ >> >> > kernel/module.c | 5 ++++- >> >> > 5 files changed, 40 insertions(+), 1 deletions(-) >> >> > >> >> > diff --git a/include/linux/audit.h b/include/linux/audit.h >> >> > index 2be99b2..7bb23d5 100644 >> >> > --- a/include/linux/audit.h >> >> > +++ b/include/linux/audit.h >> >> > @@ -360,6 +360,7 @@ extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm, >> >> > const struct cred *old); >> >> > extern void __audit_log_capset(const struct cred *new, const struct cred *old); >> >> > extern void __audit_mmap_fd(int fd, int flags); >> >> > +extern void __audit_module_init(char *name); >> >> > >> >> > static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp) >> >> > { >> >> > @@ -450,6 +451,12 @@ static inline void audit_mmap_fd(int fd, int flags) >> >> > __audit_mmap_fd(fd, flags); >> >> > } >> >> > >> >> > +static inline void audit_module_init(char *name) >> >> > +{ >> >> > + if (!audit_dummy_context()) >> >> > + __audit_module_init(name); >> >> > +} >> >> >> >> More on this below, but I was expecting the function above to named >> >> audit_log_kern_module(), or something similar. >> > >> > Ok fair enough, I had mis-understood your previous point. >> >> I probably could have been more specific too. >> >> > Any comment on the new record format? >> >> Not really, it's just the single field so it's kinda hard to have >> anything meaningful to say. We obviously need to worry about the >> field name, but I'll let Steve speak to that as that likely means more >> to him than it does to me. From my perspective, "name" seems >> perfectly reasonable, especially since it is in the context of a >> module specific record (no real worries about it being ambiguous). > > Do you see a need to include module initialization arguments? It sounds > potentially useful to me, but also potentially bandwidth-consuming. I > have a prototype patch to add the args as one encoded field. Along with > the addition of this field is the concern about message lengths and > buffer allocations since it is an encoded field that would need twice > the length of the argment text to store in the message. Argument filtering is surely going to be a mess, just look at the related execve() stuff. Unless there is a hard requirement I say skip the argument logging for now, we can always add it later.

paul moore