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-rw-r--r--src/journal/coredump.c37
1 files changed, 18 insertions, 19 deletions
diff --git a/src/journal/coredump.c b/src/journal/coredump.c
index e820c6f71a..e80b2f7c79 100644
--- a/src/journal/coredump.c
+++ b/src/journal/coredump.c
@@ -478,21 +478,25 @@ static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_s
*/
static int compose_open_fds(pid_t pid, char **open_fds) {
_cleanup_fclose_ FILE *stream = NULL;
- char path[PATH_MAX], line[LINE_MAX];
size_t ignored_size;
- const char *fddelim = "";
+ const char *fddelim = "", *path;
struct dirent *dent = NULL;
_cleanup_closedir_ DIR *proc_fd_dir = NULL;
+ _cleanup_close_ int proc_fdinfo_fd = -1;
int r = 0;
assert(pid >= 0);
assert(open_fds != NULL);
- sprintf(path, "/proc/"PID_FMT"/fd", pid);
+ path = procfs_file_alloca(pid, "fd");
proc_fd_dir = opendir(path);
+ if (!proc_fd_dir)
+ return -errno;
- if (proc_fd_dir == NULL)
- return -ENOENT;
+ proc_fdinfo_fd = openat(dirfd(proc_fd_dir), "../fdinfo",
+ O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC|O_PATH);
+ if (proc_fdinfo_fd < 0)
+ return -errno;
stream = open_memstream(open_fds, &ignored_size);
if (!stream)
@@ -500,18 +504,14 @@ static int compose_open_fds(pid_t pid, char **open_fds) {
for (dent = readdir(proc_fd_dir); dent != NULL; dent = readdir(proc_fd_dir)) {
_cleanup_free_ char *fdname = NULL;
+ int fd;
_cleanup_fclose_ FILE *fdinfo = NULL;
+ char line[LINE_MAX];
if (dent->d_name[0] == '.' || strcmp(dent->d_name, "..") == 0)
continue;
- /* Too long path is unlikely a path to valid file descriptor in /proc/[pid]/fd */
- /* Skip it. */
- r = snprintf(path, sizeof(path), "/proc/"PID_FMT"/fd/%s", pid, dent->d_name);
- if (r >= (int)sizeof(path))
- continue;
-
- r = readlink_malloc(path, &fdname);
+ r = readlinkat_malloc(dirfd(proc_fd_dir), dent->d_name, &fdname);
if (r < 0)
return r;
@@ -519,16 +519,15 @@ static int compose_open_fds(pid_t pid, char **open_fds) {
fddelim = "\n";
/* Use the directory entry from /proc/[pid]/fd with /proc/[pid]/fdinfo */
-
- /* Too long path is unlikely a path to valid file descriptor info in /proc/[pid]/fdinfo */
- /* Skip it. */
- r = snprintf(path, sizeof(path), "/proc/"PID_FMT"/fdinfo/%s", pid, dent->d_name);
- if (r >= (int)sizeof(path))
+ fd = openat(proc_fdinfo_fd, dent->d_name, O_NOFOLLOW|O_CLOEXEC|O_RDONLY);
+ if (fd < 0)
continue;
- fdinfo = fopen(path, "re");
- if (fdinfo == NULL)
+ fdinfo = fdopen(fd, "re");
+ if (fdinfo == NULL) {
+ close(fd);
continue;
+ }
while(fgets(line, sizeof(line), fdinfo) != NULL)
fprintf(stream, "%s%s",