From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 6 Apr 2022 14:55:11 +0000 (-0400)
Subject: Fix: don't use strerror() from ust lock nocheck
X-Git-Url: http://git.liburcu.org/?p=lttng-ust.git;a=commitdiff_plain;h=ab64db3571ab2b39a2218f81b3483768f815822a

Fix: don't use strerror() from ust lock nocheck

ust_lock_nocheck is meant to be async-signal-safe for use from the
fork() override helper (and fork(2) is async-signal-safe).

Remove calls to strerror() from ust lock functions and from the
cancelstate helper because strerror is not async-signal-safe and indeed
allocates memory.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I461f3631a24e71232d987b0a984b4942903bf9ac
---

diff --git a/src/lib/lttng-ust-common/ust-cancelstate.c b/src/lib/lttng-ust-common/ust-cancelstate.c
index 7835803b..e42c7b4e 100644
--- a/src/lib/lttng-ust-common/ust-cancelstate.c
+++ b/src/lib/lttng-ust-common/ust-cancelstate.c
@@ -28,7 +28,7 @@ int lttng_ust_cancelstate_disable_push(void)
 		goto end;
 	ret = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldstate);
 	if (ret) {
-		ERR("pthread_setcancelstate: %s", strerror(ret));
+		ERR("pthread_setcancelstate: ret=%d", ret);
 		return -1;
 	}
 	state->oldstate = oldstate;
@@ -47,7 +47,7 @@ int lttng_ust_cancelstate_disable_pop(void)
 		goto end;
 	ret = pthread_setcancelstate(state->oldstate, &oldstate);
 	if (ret) {
-		ERR("pthread_setcancelstate: %s", strerror(ret));
+		ERR("pthread_setcancelstate: ret=%d", ret);
 		return -1;
 	}
 	if (oldstate != PTHREAD_CANCEL_DISABLE) {
diff --git a/src/lib/lttng-ust/lttng-ust-comm.c b/src/lib/lttng-ust/lttng-ust-comm.c
index caba7452..384a6a58 100644
--- a/src/lib/lttng-ust/lttng-ust-comm.c
+++ b/src/lib/lttng-ust/lttng-ust-comm.c
@@ -134,13 +134,13 @@ int ust_lock(void)
 	sigfillset(&sig_all_blocked);
 	ret = pthread_sigmask(SIG_SETMASK, &sig_all_blocked, &orig_mask);
 	if (ret) {
-		ERR("pthread_sigmask: %s", strerror(ret));
+		ERR("pthread_sigmask: ret=%d", ret);
 	}
 	if (!URCU_TLS(ust_mutex_nest)++)
 		pthread_mutex_lock(&ust_mutex);
 	ret = pthread_sigmask(SIG_SETMASK, &orig_mask, NULL);
 	if (ret) {
-		ERR("pthread_sigmask: %s", strerror(ret));
+		ERR("pthread_sigmask: ret=%d", ret);
 	}
 	if (lttng_ust_comm_should_quit) {
 		return -1;
@@ -166,13 +166,13 @@ void ust_lock_nocheck(void)
 	sigfillset(&sig_all_blocked);
 	ret = pthread_sigmask(SIG_SETMASK, &sig_all_blocked, &orig_mask);
 	if (ret) {
-		ERR("pthread_sigmask: %s", strerror(ret));
+		ERR("pthread_sigmask: ret=%d", ret);
 	}
 	if (!URCU_TLS(ust_mutex_nest)++)
 		pthread_mutex_lock(&ust_mutex);
 	ret = pthread_sigmask(SIG_SETMASK, &orig_mask, NULL);
 	if (ret) {
-		ERR("pthread_sigmask: %s", strerror(ret));
+		ERR("pthread_sigmask: ret=%d", ret);
 	}
 }
 
@@ -187,13 +187,13 @@ void ust_unlock(void)
 	sigfillset(&sig_all_blocked);
 	ret = pthread_sigmask(SIG_SETMASK, &sig_all_blocked, &orig_mask);
 	if (ret) {
-		ERR("pthread_sigmask: %s", strerror(ret));
+		ERR("pthread_sigmask: ret=%d", ret);
 	}
 	if (!--URCU_TLS(ust_mutex_nest))
 		pthread_mutex_unlock(&ust_mutex);
 	ret = pthread_sigmask(SIG_SETMASK, &orig_mask, NULL);
 	if (ret) {
-		ERR("pthread_sigmask: %s", strerror(ret));
+		ERR("pthread_sigmask: ret=%d", ret);
 	}
 	if (lttng_ust_cancelstate_disable_pop()) {
 		ERR("lttng_ust_cancelstate_disable_pop");