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-rw-r--r--src/basic/nss-util.h2
-rw-r--r--src/basic/signal-util.h11
-rw-r--r--src/nss-myhostname/nss-myhostname.c7
-rw-r--r--src/nss-mymachines/nss-mymachines.c13
-rw-r--r--src/nss-resolve/nss-resolve.c7
-rw-r--r--src/test/test-signal-util.c49
6 files changed, 89 insertions, 0 deletions
diff --git a/src/basic/nss-util.h b/src/basic/nss-util.h
index cc30d93aad..4be0136da6 100644
--- a/src/basic/nss-util.h
+++ b/src/basic/nss-util.h
@@ -27,6 +27,8 @@
#include <pwd.h>
#include <resolv.h>
+#define NSS_SIGNALS_BLOCK SIGALRM,SIGVTALRM,SIGPIPE,SIGCHLD,SIGTSTP,SIGIO,SIGHUP,SIGUSR1,SIGUSR2,SIGPROF,SIGURG,SIGWINCH
+
#define NSS_GETHOSTBYNAME_PROTOTYPES(module) \
enum nss_status _nss_##module##_gethostbyname4_r( \
const char *name, \
diff --git a/src/basic/signal-util.h b/src/basic/signal-util.h
index e7393e2dac..5d94d1c363 100644
--- a/src/basic/signal-util.h
+++ b/src/basic/signal-util.h
@@ -41,3 +41,14 @@ int signal_from_string(const char *s) _pure_;
int signal_from_string_try_harder(const char *s);
void nop_signal_handler(int sig);
+
+static inline void block_signals_reset(sigset_t *ss) {
+ assert_se(sigprocmask(SIG_SETMASK, ss, NULL) >= 0);
+}
+
+#define BLOCK_SIGNALS(...) \
+ _cleanup_(block_signals_reset) sigset_t _saved_sigset = ({ \
+ sigset_t t; \
+ assert_se(sigprocmask_many(SIG_BLOCK, &t, __VA_ARGS__, -1) >= 0); \
+ t; \
+ })
diff --git a/src/nss-myhostname/nss-myhostname.c b/src/nss-myhostname/nss-myhostname.c
index ee10b105ea..e438625814 100644
--- a/src/nss-myhostname/nss-myhostname.c
+++ b/src/nss-myhostname/nss-myhostname.c
@@ -31,6 +31,7 @@
#include "local-addresses.h"
#include "macro.h"
#include "nss-util.h"
+#include "signal-util.h"
#include "string-util.h"
#include "util.h"
@@ -63,6 +64,8 @@ enum nss_status _nss_myhostname_gethostbyname4_r(
char *r_name;
unsigned n;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(name);
assert(pat);
assert(buffer);
@@ -327,6 +330,8 @@ enum nss_status _nss_myhostname_gethostbyname3_r(
uint32_t local_address_ipv4 = 0;
int n_addresses = 0;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(name);
assert(host);
assert(buffer);
@@ -409,6 +414,8 @@ enum nss_status _nss_myhostname_gethostbyaddr2_r(
bool additional_from_hostname = false;
unsigned n;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(addr);
assert(host);
assert(buffer);
diff --git a/src/nss-mymachines/nss-mymachines.c b/src/nss-mymachines/nss-mymachines.c
index dcdbc31a78..3cd29500d0 100644
--- a/src/nss-mymachines/nss-mymachines.c
+++ b/src/nss-mymachines/nss-mymachines.c
@@ -31,6 +31,7 @@
#include "in-addr-util.h"
#include "macro.h"
#include "nss-util.h"
+#include "signal-util.h"
#include "string-util.h"
#include "user-util.h"
#include "util.h"
@@ -94,6 +95,8 @@ enum nss_status _nss_mymachines_gethostbyname4_r(
char *r_name;
int n_ifindices, r;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(name);
assert(pat);
assert(buffer);
@@ -242,6 +245,8 @@ enum nss_status _nss_mymachines_gethostbyname3_r(
size_t l, idx, ms, alen;
int r;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(name);
assert(result);
assert(buffer);
@@ -404,6 +409,8 @@ enum nss_status _nss_mymachines_getpwnam_r(
size_t l;
int r;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(name);
assert(pwd);
@@ -491,6 +498,8 @@ enum nss_status _nss_mymachines_getpwuid_r(
uint32_t mapped;
int r;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
if (!uid_is_valid(uid)) {
r = -EINVAL;
goto fail;
@@ -564,6 +573,8 @@ enum nss_status _nss_mymachines_getgrnam_r(
size_t l;
int r;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(name);
assert(gr);
@@ -649,6 +660,8 @@ enum nss_status _nss_mymachines_getgrgid_r(
uint32_t mapped;
int r;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
if (!gid_is_valid(gid)) {
r = -EINVAL;
goto fail;
diff --git a/src/nss-resolve/nss-resolve.c b/src/nss-resolve/nss-resolve.c
index 2b716a69d1..7864e5370b 100644
--- a/src/nss-resolve/nss-resolve.c
+++ b/src/nss-resolve/nss-resolve.c
@@ -34,6 +34,7 @@
#include "nss-util.h"
#include "string-util.h"
#include "util.h"
+#include "signal-util.h"
NSS_GETHOSTBYNAME_PROTOTYPES(resolve);
NSS_GETHOSTBYADDR_PROTOTYPES(resolve);
@@ -127,6 +128,8 @@ enum nss_status _nss_resolve_gethostbyname4_r(
char *r_name;
int c, r, i = 0;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(name);
assert(pat);
assert(buffer);
@@ -307,6 +310,8 @@ enum nss_status _nss_resolve_gethostbyname3_r(
const char *canonical;
int c, r, i = 0;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(name);
assert(result);
assert(buffer);
@@ -512,6 +517,8 @@ enum nss_status _nss_resolve_gethostbyaddr2_r(
const char *n;
int r, ifindex;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(addr);
assert(result);
assert(buffer);
diff --git a/src/test/test-signal-util.c b/src/test/test-signal-util.c
new file mode 100644
index 0000000000..3083501ce9
--- /dev/null
+++ b/src/test/test-signal-util.c
@@ -0,0 +1,49 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2016 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "signal-util.h"
+
+static void test_block_signals(void) {
+ sigset_t ss;
+
+ assert_se(sigprocmask(0, NULL, &ss) >= 0);
+
+ assert_se(sigismember(&ss, SIGUSR1) == 0);
+ assert_se(sigismember(&ss, SIGALRM) == 0);
+ assert_se(sigismember(&ss, SIGVTALRM) == 0);
+
+ {
+ BLOCK_SIGNALS(SIGUSR1, SIGVTALRM);
+
+ assert_se(sigprocmask(0, NULL, &ss) >= 0);
+ assert_se(sigismember(&ss, SIGUSR1) == 1);
+ assert_se(sigismember(&ss, SIGALRM) == 0);
+ assert_se(sigismember(&ss, SIGVTALRM) == 1);
+
+ }
+
+ assert_se(sigprocmask(0, NULL, &ss) >= 0);
+ assert_se(sigismember(&ss, SIGUSR1) == 0);
+ assert_se(sigismember(&ss, SIGALRM) == 0);
+ assert_se(sigismember(&ss, SIGVTALRM) == 0);
+}
+
+int main(int argc, char *argv[]) {
+ test_block_signals();
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-09 19:30:56 +0000