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Fixed undefined behavior on signals.

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The C11 specification allows only sig_atomic_t and _Atomic variable
access. All other accesses to global variables are undefined behavior.

Using int was probably OK on x86 and x86_64; yet there were some reports
from other architectures (especially some MIPS) that in rare cases,
after issuing SIGHUP, BIRD did strange things.
This commit is contained in:
Maria Matejka 2019-10-04 12:20:02 +02:00 committed by Maria Matejka
parent 4821251ebb
commit 24493e9169
4 changed files with 12 additions and 10 deletions
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4
sysdep/unix/io.c
View file

@ -2154,10 +2154,6 @@ watchdog_stop(void)
* Main I/O Loop
*/
volatile int async_config_flag; /* Asynchronous reconfiguration/dump scheduled */
volatile int async_dump_flag;
volatile int async_shutdown_flag;
void
io_init(void)
{

6
sysdep/unix/main.c
View file

@ -601,9 +601,9 @@ cmd_graceful_restart(void)
* Signals
*/
volatile int async_config_flag;
volatile int async_dump_flag;
volatile int async_shutdown_flag;
volatile sig_atomic_t async_config_flag;
volatile sig_atomic_t async_dump_flag;
volatile sig_atomic_t async_shutdown_flag;
static void
handle_sighup(int sig UNUSED)

7
sysdep/unix/unix.h
View file

@ -10,6 +10,7 @@
#define _BIRD_UNIX_H_
#include <sys/socket.h>
#include <signal.h>
struct pool;
struct iface;
@ -97,9 +98,9 @@ int sockaddr_read(sockaddr *sa, int af, ip_addr *a, struct iface **ifa, uint *po
#define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) + strlen ((ptr)->sun_path))
#endif
extern volatile int async_config_flag;
extern volatile int async_dump_flag;
extern volatile int async_shutdown_flag;
extern volatile sig_atomic_t async_config_flag;
extern volatile sig_atomic_t async_dump_flag;
extern volatile sig_atomic_t async_shutdown_flag;
void io_init(void);
void io_loop(void);

5
test/birdtest.c
View file

@ -36,6 +36,11 @@ static int no_fork;
static int no_timeout;
static int is_terminal; /* Whether stdout is a live terminal or pipe redirect */
volatile sig_atomic_t async_config_flag; /* Asynchronous reconfiguration/dump scheduled */
volatile sig_atomic_t async_dump_flag;
volatile sig_atomic_t async_shutdown_flag;
uint bt_verbose;
const char *bt_filename;
const char *bt_test_id;