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glibc/SOURCES/glibc-rh2047981-16.patch

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commit 3dac3959a5cb585b065cef2cb8a8d909c907e202
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Tue Jul 20 11:03:34 2021 -0300
elf: Add _dl_audit_activity_map and _dl_audit_activity_nsid
It consolidates the code required to call la_activity audit
callback.
Also for a new Lmid_t the namespace link_map list are empty, so it
requires to check if before using it. This can happen for when audit
module is used along with dlmopen.
Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
diff --git a/elf/dl-audit.c b/elf/dl-audit.c
index 4066dfe85146b9d4..74b87f4b39be75e1 100644
--- a/elf/dl-audit.c
+++ b/elf/dl-audit.c
@@ -18,6 +18,32 @@
#include <ldsodefs.h>
+void
+_dl_audit_activity_map (struct link_map *l, int action)
+{
+ struct audit_ifaces *afct = GLRO(dl_audit);
+ for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+ {
+ if (afct->activity != NULL)
+ afct->activity (&link_map_audit_state (l, cnt)->cookie, action);
+ afct = afct->next;
+ }
+}
+
+void
+_dl_audit_activity_nsid (Lmid_t nsid, int action)
+{
+ /* If head is NULL, the namespace has become empty, and the audit interface
+ does not give us a way to signal LA_ACT_CONSISTENT for it because the
+ first loaded module is used to identify the namespace. */
+ struct link_map *head = GL(dl_ns)[nsid]._ns_loaded;
+ if (__glibc_likely (GLRO(dl_naudit) == 0)
+ || head == NULL || head->l_auditing)
+ return;
+
+ _dl_audit_activity_map (head, action);
+}
+
void
_dl_audit_objopen (struct link_map *l, Lmid_t nsid)
{
diff --git a/elf/dl-close.c b/elf/dl-close.c
index 698bda929c0eab6c..1ba594b600c4c87a 100644
--- a/elf/dl-close.c
+++ b/elf/dl-close.c
@@ -478,25 +478,7 @@ _dl_close_worker (struct link_map *map, bool force)
#ifdef SHARED
/* Auditing checkpoint: we will start deleting objects. */
- if (__glibc_unlikely (do_audit))
- {
- struct link_map *head = ns->_ns_loaded;
- struct audit_ifaces *afct = GLRO(dl_audit);
- /* Do not call the functions for any auditing object. */
- if (head->l_auditing == 0)
- {
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
- {
- if (afct->activity != NULL)
- {
- struct auditstate *state = link_map_audit_state (head, cnt);
- afct->activity (&state->cookie, LA_ACT_DELETE);
- }
-
- afct = afct->next;
- }
- }
- }
+ _dl_audit_activity_nsid (nsid, LA_ACT_DELETE);
#endif
/* Notify the debugger we are about to remove some loaded objects. */
@@ -791,32 +773,9 @@ _dl_close_worker (struct link_map *map, bool force)
__rtld_lock_unlock_recursive (GL(dl_load_tls_lock));
#ifdef SHARED
- /* Auditing checkpoint: we have deleted all objects. */
- if (__glibc_unlikely (do_audit))
- {
- struct link_map *head = ns->_ns_loaded;
- /* If head is NULL, the namespace has become empty, and the
- audit interface does not give us a way to signal
- LA_ACT_CONSISTENT for it because the first loaded module is
- used to identify the namespace.
-
- Furthermore, do not notify auditors of the cleanup of a
- failed audit module loading attempt. */
- if (head != NULL && head->l_auditing == 0)
- {
- struct audit_ifaces *afct = GLRO(dl_audit);
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
- {
- if (afct->activity != NULL)
- {
- struct auditstate *state = link_map_audit_state (head, cnt);
- afct->activity (&state->cookie, LA_ACT_CONSISTENT);
- }
-
- afct = afct->next;
- }
- }
- }
+ /* Auditing checkpoint: we have deleted all objects. Also, do not notify
+ auditors of the cleanup of a failed audit module loading attempt. */
+ _dl_audit_activity_nsid (nsid, LA_ACT_CONSISTENT);
#endif
if (__builtin_expect (ns->_ns_loaded == NULL, 0)
diff --git a/elf/dl-load.c b/elf/dl-load.c
index c11b1d1781e9b40b..8a18c761bb753e37 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -1403,24 +1403,8 @@ cannot enable executable stack as shared object requires");
/* Auditing checkpoint: we are going to add new objects. Since this
is called after _dl_add_to_namespace_list the namespace is guaranteed
to not be empty. */
- if ((mode & __RTLD_AUDIT) == 0
- && __glibc_unlikely (GLRO(dl_naudit) > 0))
- {
- struct link_map *head = GL(dl_ns)[nsid]._ns_loaded;
- /* Do not call the functions for any auditing object. */
- if (head->l_auditing == 0)
- {
- struct audit_ifaces *afct = GLRO(dl_audit);
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
- {
- if (afct->activity != NULL)
- afct->activity (&link_map_audit_state (head, cnt)->cookie,
- LA_ACT_ADD);
-
- afct = afct->next;
- }
- }
- }
+ if ((mode & __RTLD_AUDIT) == 0)
+ _dl_audit_activity_nsid (nsid, LA_ACT_ADD);
#endif
/* Notify the debugger we have added some objects. We need to
diff --git a/elf/dl-open.c b/elf/dl-open.c
index b5a4da04907d8d29..660a56b2fb2639cd 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -598,25 +598,7 @@ dl_open_worker_begin (void *a)
#ifdef SHARED
/* Auditing checkpoint: we have added all objects. */
- if (__glibc_unlikely (GLRO(dl_naudit) > 0))
- {
- struct link_map *head = GL(dl_ns)[new->l_ns]._ns_loaded;
- /* Do not call the functions for any auditing object. */
- if (head->l_auditing == 0)
- {
- struct audit_ifaces *afct = GLRO(dl_audit);
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
- {
- if (afct->activity != NULL)
- {
- struct auditstate *state = link_map_audit_state (head, cnt);
- afct->activity (&state->cookie, LA_ACT_CONSISTENT);
- }
-
- afct = afct->next;
- }
- }
- }
+ _dl_audit_activity_nsid (new->l_ns, LA_ACT_CONSISTENT);
#endif
/* Notify the debugger all new objects are now ready to go. */
diff --git a/elf/rtld.c b/elf/rtld.c
index 1982e42390760e0a..767acd122262b824 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -1799,18 +1799,7 @@ ERROR: '%s': cannot process note segment.\n", _dl_argv[0]);
/* Auditing checkpoint: we are ready to signal that the initial map
is being constructed. */
- if (__glibc_unlikely (GLRO(dl_naudit) > 0))
- {
- struct audit_ifaces *afct = GLRO(dl_audit);
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
- {
- if (afct->activity != NULL)
- afct->activity (&link_map_audit_state (main_map, cnt)->cookie,
- LA_ACT_ADD);
-
- afct = afct->next;
- }
- }
+ _dl_audit_activity_map (main_map, LA_ACT_ADD);
/* We have two ways to specify objects to preload: via environment
variable and via the file /etc/ld.so.preload. The latter can also
@@ -2484,23 +2473,7 @@ ERROR: '%s': cannot process note segment.\n", _dl_argv[0]);
#ifdef SHARED
/* Auditing checkpoint: we have added all objects. */
- if (__glibc_unlikely (GLRO(dl_naudit) > 0))
- {
- struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
- /* Do not call the functions for any auditing object. */
- if (head->l_auditing == 0)
- {
- struct audit_ifaces *afct = GLRO(dl_audit);
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
- {
- if (afct->activity != NULL)
- afct->activity (&link_map_audit_state (head, cnt)->cookie,
- LA_ACT_CONSISTENT);
-
- afct = afct->next;
- }
- }
- }
+ _dl_audit_activity_nsid (LM_ID_BASE, LA_ACT_CONSISTENT);
#endif
/* Notify the debugger all new objects are now ready to go. We must re-get
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 410f070e28b74bdf..05737342d6287233 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -1269,6 +1269,16 @@ link_map_audit_state (struct link_map *l, size_t index)
return &l->l_audit[index];
}
+/* Call the la_activity from the audit modules from the link map L and issues
+ the ACTION argument. */
+void _dl_audit_activity_map (struct link_map *l, int action)
+ attribute_hidden;
+
+/* Call the la_activity from the audit modules from the link map from the
+ namespace NSID and issues the ACTION argument. */
+void _dl_audit_activity_nsid (Lmid_t nsid, int action)
+ attribute_hidden;
+
/* Call the la_objopen from the audit modules for the link_map L on the
namespace identification NSID. */
void _dl_audit_objopen (struct link_map *l, Lmid_t nsid)
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