From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org
Cc: John Mellor-Crummey <johnmc@rice.edu>, Ben Woodard <woodard@redhat.com>
Subject: [PATCH v4 07/21] elf: Add _dl_audit_activity_map and _dl_audit_activity_nsid
Date: Thu, 14 Oct 2021 14:47:38 -0300 [thread overview]
Message-ID: <20211014174752.1651347-8-adhemerval.zanella@linaro.org> (raw)
In-Reply-To: <20211014174752.1651347-1-adhemerval.zanella@linaro.org>
It consolidates the code required to call la_activity() audit
callback.
Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
---
elf/dl-audit.c | 23 ++++++++++++++++
elf/dl-close.c | 54 +++++++-------------------------------
elf/dl-load.c | 28 +++++---------------
elf/dl-open.c | 20 +-------------
elf/rtld.c | 31 ++--------------------
sysdeps/generic/ldsodefs.h | 7 +++++
6 files changed, 48 insertions(+), 115 deletions(-)
diff --git a/elf/dl-audit.c b/elf/dl-audit.c
index 24d8557f18..5fbc76a36c 100644
--- a/elf/dl-audit.c
+++ b/elf/dl-audit.c
@@ -19,6 +19,29 @@
#include <ldsodefs.h>
#ifdef SHARED
+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)
+{
+ 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, bool check_audit)
{
diff --git a/elf/dl-close.c b/elf/dl-close.c
index cfe0f1c0c9..6fadf38f7f 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 +773,14 @@ _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. 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. */
+ _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 b5f88e1723..dad7654f94 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -1062,28 +1062,12 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
if (r->r_state == RT_CONSISTENT)
{
#ifdef SHARED
- /* Auditing checkpoint: we are going to add new objects. */
- 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 and also do not
- try to call auditing functions if the namespace is currently
- empty. This happens when opening the first DSO in a new
- namespace. */
- 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)
- afct->activity (&link_map_audit_state (head, cnt)->cookie,
- LA_ACT_ADD);
-
- afct = afct->next;
- }
- }
- }
+ /* Auditing checkpoint: we are going to add new objects. Do not call
+ the functions for any auditing object and also do not try to call
+ auditing functions if the namespace is currently empty. This
+ happens when opening the first DSO in a new namespace. */
+ 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 00f6d8cfcc..4f4d72e325 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -611,25 +611,7 @@ 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 b327097405..13bb1ba4cd 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -1751,18 +1751,7 @@ dl_main (const ElfW(Phdr) *phdr,
/* 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
@@ -2443,23 +2432,7 @@ dl_main (const ElfW(Phdr) *phdr,
#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 12f6346328..1237d1a38b 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -1361,6 +1361,13 @@ link_map_audit_state (struct link_map *l, size_t 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 NSSID and issues the ACTION argument. */
+void _dl_audit_activity_nsid (Lmid_t nsid, int action);
/* Call the la_objopen() from the audit modules for the link_map L on the
namespace identification NSID. If CHECK_AUDIT is set it will also check
if main mapping of the namespace is a audit modules. */
--
2.30.2
next prev parent reply other threads:[~2021-10-14 17:48 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-14 17:47 [PATCH v4 00/21] Some rtld-audit fixes Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 01/21] elf: Avoid unnecessary slowdown from profiling with audit (BZ#15533) Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 02/21] elf: Add audit tests for modules with TLSDESC Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 03/21] elf: Do not fail for failed dlopem on audit modules (BZ #28061) Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 04/21] elf: Suppress audit calls when a (new) namespace is empty (BZ #28062) Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 05/21] elf: Fix initial-exec TLS access on audit modules (BZ #28096) Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 06/21] elf: Add _dl_audit_objopen Adhemerval Zanella
2021-10-14 17:47 ` Adhemerval Zanella [this message]
2021-10-14 17:47 ` [PATCH v4 08/21] elf: Add _dl_audit_objsearch Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 09/21] elf: Add _dl_audit_objclose Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 10/21] elf: Add _dl_audit_symbind_alt and _dl_audit_symbind Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 11/21] elf: Add _dl_audit_preinit Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 12/21] elf: Add _dl_audit_pltenter Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 13/21] elf: Add _dl_audit_pltexit Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 14/21] elf: Issue audit la_objopen() for vDSO Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 15/21] elf: Add main application on main_map l_name Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 16/21] elf: Add la_activity during application exit Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 17/21] elf: Issue la_symbind() for bind-now (BZ #23734) Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 18/21] elf: Add LA_SYMB_BINDNOW Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 19/21] elf: Move LAV_CURRENT to link_lavcurrent.h Adhemerval Zanella
2021-10-14 17:47 ` [PATCH v4 20/21] elf: Fix runtime linker auditing on aarch64 (BZ #26643) Adhemerval Zanella
2021-10-14 17:47 ` [RFC 21/21] elf: Add SVE support for aarch64 rtld-audit Adhemerval Zanella
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