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zed: set O_CLOEXEC on persistent fds, remove closefrom() from pre-exec

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Also don't dup /dev/null over stdio if daemonised

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11891
This commit is contained in:
наб 2021-04-12 14:07:14 +02:00 committed by Brian Behlendorf
parent d682e20ba4
commit 55cf5a255a
3 changed files with 9 additions and 13 deletions
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11
cmd/zed/zed_conf.c
View File

@ -425,8 +425,6 @@ zed_conf_scan_dir(struct zed_conf *zcp)
int int
zed_conf_write_pid(struct zed_conf *zcp) zed_conf_write_pid(struct zed_conf *zcp)
{ {
const mode_t dirmode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
const mode_t filemode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
char buf[PATH_MAX]; char buf[PATH_MAX];
int n; int n;
char *p; char *p;
@ -454,7 +452,7 @@ zed_conf_write_pid(struct zed_conf *zcp)
if (p) if (p)
*p = '\0'; *p = '\0';
if ((mkdirp(buf, dirmode) < 0) && (errno != EEXIST)) { if ((mkdirp(buf, 0755) < 0) && (errno != EEXIST)) {
zed_log_msg(LOG_ERR, "Failed to create directory \"%s\": %s", zed_log_msg(LOG_ERR, "Failed to create directory \"%s\": %s",
buf, strerror(errno)); buf, strerror(errno));
goto err; goto err;
@ -464,7 +462,7 @@ zed_conf_write_pid(struct zed_conf *zcp)
*/ */
mask = umask(0); mask = umask(0);
umask(mask | 022); umask(mask | 022);
zcp->pid_fd = open(zcp->pid_file, (O_RDWR | O_CREAT), filemode); zcp->pid_fd = open(zcp->pid_file, O_RDWR | O_CREAT | O_CLOEXEC, 0644);
umask(mask); umask(mask);
if (zcp->pid_fd < 0) { if (zcp->pid_fd < 0) {
zed_log_msg(LOG_ERR, "Failed to open PID file \"%s\": %s", zed_log_msg(LOG_ERR, "Failed to open PID file \"%s\": %s",
@ -529,7 +527,6 @@ int
zed_conf_open_state(struct zed_conf *zcp) zed_conf_open_state(struct zed_conf *zcp)
{ {
char dirbuf[PATH_MAX]; char dirbuf[PATH_MAX];
mode_t dirmode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
int n; int n;
char *p; char *p;
int rv; int rv;
@ -551,7 +548,7 @@ zed_conf_open_state(struct zed_conf *zcp)
if (p) if (p)
*p = '\0'; *p = '\0';
if ((mkdirp(dirbuf, dirmode) < 0) && (errno != EEXIST)) { if ((mkdirp(dirbuf, 0755) < 0) && (errno != EEXIST)) {
zed_log_msg(LOG_WARNING, zed_log_msg(LOG_WARNING,
"Failed to create directory \"%s\": %s", "Failed to create directory \"%s\": %s",
dirbuf, strerror(errno)); dirbuf, strerror(errno));
@ -569,7 +566,7 @@ zed_conf_open_state(struct zed_conf *zcp)
(void) unlink(zcp->state_file); (void) unlink(zcp->state_file);
zcp->state_fd = open(zcp->state_file, zcp->state_fd = open(zcp->state_file,
(O_RDWR | O_CREAT), (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)); O_RDWR | O_CREAT | O_CLOEXEC, 0644);
if (zcp->state_fd < 0) { if (zcp->state_fd < 0) {
zed_log_msg(LOG_WARNING, "Failed to open state file \"%s\": %s", zed_log_msg(LOG_WARNING, "Failed to open state file \"%s\": %s",
zcp->state_file, strerror(errno)); zcp->state_file, strerror(errno));

2
cmd/zed/zed_event.c
View File

@ -54,7 +54,7 @@ zed_event_init(struct zed_conf *zcp)
zed_log_die("Failed to initialize libzfs"); zed_log_die("Failed to initialize libzfs");
} }
zcp->zevent_fd = open(ZFS_DEV, O_RDWR); zcp->zevent_fd = open(ZFS_DEV, O_RDWR | O_CLOEXEC);
if (zcp->zevent_fd < 0) { if (zcp->zevent_fd < 0) {
if (zcp->do_idle) if (zcp->do_idle)
return (-1); return (-1);

9
cmd/zed/zed_exec.c
View File

@ -27,7 +27,6 @@
#include <unistd.h> #include <unistd.h>
#include <pthread.h> #include <pthread.h>
#include "zed_exec.h" #include "zed_exec.h"
#include "zed_file.h"
#include "zed_log.h" #include "zed_log.h"
#include "zed_strings.h" #include "zed_strings.h"
@ -116,7 +115,7 @@ _zed_exec_create_env(zed_strings_t *zsp)
*/ */
static void static void
_zed_exec_fork_child(uint64_t eid, const char *dir, const char *prog, _zed_exec_fork_child(uint64_t eid, const char *dir, const char *prog,
char *env[], int zfd) char *env[], int zfd, boolean_t in_foreground)
{ {
char path[PATH_MAX]; char path[PATH_MAX];
int n; int n;
@ -154,13 +153,13 @@ _zed_exec_fork_child(uint64_t eid, const char *dir, const char *prog,
(void) sigprocmask(SIG_SETMASK, &mask, NULL); (void) sigprocmask(SIG_SETMASK, &mask, NULL);
(void) umask(022); (void) umask(022);
if ((fd = open("/dev/null", O_RDWR)) != -1) { if (in_foreground && /* we're already devnulled if daemonised */
(fd = open("/dev/null", O_RDWR | O_CLOEXEC)) != -1) {
(void) dup2(fd, STDIN_FILENO); (void) dup2(fd, STDIN_FILENO);
(void) dup2(fd, STDOUT_FILENO); (void) dup2(fd, STDOUT_FILENO);
(void) dup2(fd, STDERR_FILENO); (void) dup2(fd, STDERR_FILENO);
} }
(void) dup2(zfd, ZEVENT_FILENO); (void) dup2(zfd, ZEVENT_FILENO);
zed_file_close_from(ZEVENT_FILENO + 1);
execle(path, prog, NULL, env); execle(path, prog, NULL, env);
_exit(127); _exit(127);
} }
@ -359,7 +358,7 @@ zed_exec_process(uint64_t eid, const char *class, const char *subclass,
n = strlen(*csp); n = strlen(*csp);
if ((strncmp(z, *csp, n) == 0) && !isalpha(z[n])) if ((strncmp(z, *csp, n) == 0) && !isalpha(z[n]))
_zed_exec_fork_child(eid, zcp->zedlet_dir, _zed_exec_fork_child(eid, zcp->zedlet_dir,
z, e, zcp->zevent_fd); z, e, zcp->zevent_fd, zcp->do_foreground);
} }
} }
free(e); free(e);