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mod_apparmor: convert aa_change_hat()s into single aa_change_hatv()

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This patch converts the request entry point from using multiple (if
necessary) aa_change_hat() calls into a single aa_change_hatv() call,
simplifying the code a bit, requiring fewer round trips between
mod_apparmor and the kernel for each request, as well as providing more
information when the apache profile is in complain mode.

Patch history:
  v1: initial version
  v2: - the server config (scfg) code accidentally re-added the
        directory config (dcfg) hat to the vector of hats, fix that
      - actually add the DEFAULT_URI hat to the vector of hats, instead
	of only logging that that is happening.
      - pass errno to ap_log_rerror() if aa_change_hatv() call fails.
      - don't call aa_change_hat again if aa_change_hatv() call fails,
	as this is no longer necessary.
  v3: - Based on feedback from jjohansen, convert exit point
        aa_change_hat() call to aa_change_hatv(), in order to work
        around aa_change_hat() bug addressed in trunk rev 2329,
        which causes the exiting aa_change_hat() call to fail and
        results in the apache process being killed by the kernel.
        When it's no longer likely that mod_apparmor could run into
        a system libapparmor that still contains this bug, this can
        be converted back.

Signed-off-by: Steve Beattie <steve@nxnw.org>
Acked-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
Steve Beattie 2014-01-23 14:08:46 -08:00
parent 8250e061d4
commit c98f54ecdc
1 changed files with 28 additions and 32 deletions
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60
changehat/mod_apparmor/mod_apparmor.c
View file

@ -135,6 +135,8 @@ immunix_enter_hat (request_rec *r)
ap_get_module_config (r->per_dir_config, &apparmor_module);
immunix_srv_cfg * scfg = (immunix_srv_cfg *)
ap_get_module_config (r->server->module_config, &apparmor_module);
const char *aa_hat_array[5] = { NULL, NULL, NULL, NULL, NULL };
int i = 0;
debug_dump_uri(r);
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "in immunix_enter_hat (%s) n:0x%lx p:0x%lx main:0x%lx",
@ -151,22 +153,14 @@ immunix_enter_hat (request_rec *r)
}
if (dcfg != NULL && dcfg->hat_name != NULL) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "calling change_hat [dcfg] %s", dcfg->hat_name);
sd_ret = aa_change_hat(dcfg->hat_name, magic_token);
if (sd_ret < 0) {
aa_change_hat(NULL, magic_token);
} else {
return OK;
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"[dcfg] adding hat '%s' to aa_change_hat vector", dcfg->hat_name);
aa_hat_array[i++] = dcfg->hat_name;
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "calling change_hat [uri] %s", r->uri);
sd_ret = aa_change_hat(r->uri, magic_token);
if (sd_ret < 0) {
aa_change_hat(NULL, magic_token);
} else {
return OK;
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"[uri] adding uri '%s' to aa_change_hat vector", r->uri);
aa_hat_array[i++] = r->uri;
if (scfg) {
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "Dumping scfg info: "
@ -177,27 +171,25 @@ immunix_enter_hat (request_rec *r)
}
if (scfg != NULL) {
if (scfg->hat_name != NULL) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "calling change_hat [scfg] %s", scfg->hat_name);
sd_ret = aa_change_hat(scfg->hat_name, magic_token);
if (sd_ret < 0) {
aa_change_hat(NULL, magic_token);
} else {
return OK;
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"[scfg] adding hat '%s' to aa_change_hat vector", scfg->hat_name);
aa_hat_array[i++] = scfg->hat_name;
} else {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "calling change_hat w/server_name %s", r->server->server_hostname);
sd_ret = aa_change_hat(r->server->server_hostname, magic_token);
if (sd_ret < 0) {
aa_change_hat(NULL, magic_token);
} else {
return OK;
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"[scfg] adding server_name '%s' to aa_change_hat vector",
r->server->server_hostname);
aa_hat_array[i++] = r->server->server_hostname;
}
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "calling change_hat DEFAULT_URI");
sd_ret = aa_change_hat(DEFAULT_URI_HAT, magic_token);
if (sd_ret < 0) aa_change_hat(NULL, magic_token);
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"[default] adding '%s' to aa_change_hat vector", DEFAULT_URI_HAT);
aa_hat_array[i++] = DEFAULT_URI_HAT;
sd_ret = aa_change_hatv(aa_hat_array, magic_token);
if (sd_ret < 0) {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, errno, r, "aa_change_hatv call failed");
}
return OK;
}
@ -212,7 +204,11 @@ immunix_exit_hat (request_rec *r)
ap_get_module_config (r->server->module_config, &apparmor_module); */
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "exiting change_hat: dir hat %s dir path %s",
dcfg->hat_name, dcfg->path);
aa_change_hat(NULL, magic_token);
/* can convert the following back to aa_change_hat() when the
* aa_change_hat() bug addressed in trunk commit 2329 lands in most
* system libapparmors */
aa_change_hatv(NULL, magic_token);
sd_ret = aa_change_hat(DEFAULT_HAT, magic_token);
if (sd_ret < 0) {