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From 79e0852a6a3f20cba92ac18aa6ac61d24d04d3c7 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Thu, 29 Sep 2016 16:06:02 +0200
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Subject: [PATCH] pid1: process zero-length notification messages again
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This undoes 531ac2b234. I acked that patch without looking at the code
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carefully enough. There are two problems:
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- we want to process the fds anyway
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- in principle empty notification messages are valid, and we should
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process them as usual, including logging using log_unit_debug().
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Cherry-picked from: a86b767
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Resolves: #1381573
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---
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src/core/manager.c | 15 ++++++---------
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1 file changed, 6 insertions(+), 9 deletions(-)
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diff --git a/src/core/manager.c b/src/core/manager.c
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index ed81059..0376c4d 100644
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--- a/src/core/manager.c
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+++ b/src/core/manager.c
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@@ -1614,13 +1614,12 @@ static int manager_dispatch_cgroups_agent_fd(sd_event_source *source, int fd, ui
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return 0;
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}
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-static void manager_invoke_notify_message(Manager *m, Unit *u, pid_t pid, char *buf, size_t n, FDSet *fds) {
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+static void manager_invoke_notify_message(Manager *m, Unit *u, pid_t pid, const char *buf, FDSet *fds) {
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_cleanup_strv_free_ char **tags = NULL;
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assert(m);
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assert(u);
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assert(buf);
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- assert(n > 0);
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tags = strv_split(buf, "\n\r");
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if (!tags) {
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@@ -1682,10 +1681,6 @@ static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t
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* example... */
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return 0;
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}
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- if (n == 0) {
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- log_debug("Got zero-length notification message. Ignoring.");
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- return 0;
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- }
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CMSG_FOREACH(cmsg, &msghdr) {
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if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
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@@ -1722,25 +1717,27 @@ static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t
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return 0;
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}
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+ /* The message should be a string. Here we make sure it's NUL-terminated,
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+ * but only the part until first NUL will be used anyway. */
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buf[n] = 0;
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/* Notify every unit that might be interested, but try
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* to avoid notifying the same one multiple times. */
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u1 = manager_get_unit_by_pid(m, ucred->pid);
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if (u1) {
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- manager_invoke_notify_message(m, u1, ucred->pid, buf, n, fds);
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+ manager_invoke_notify_message(m, u1, ucred->pid, buf, fds);
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found = true;
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}
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u2 = hashmap_get(m->watch_pids1, LONG_TO_PTR(ucred->pid));
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if (u2 && u2 != u1) {
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- manager_invoke_notify_message(m, u2, ucred->pid, buf, n, fds);
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+ manager_invoke_notify_message(m, u2, ucred->pid, buf, fds);
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found = true;
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}
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u3 = hashmap_get(m->watch_pids2, LONG_TO_PTR(ucred->pid));
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if (u3 && u3 != u2 && u3 != u1) {
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- manager_invoke_notify_message(m, u3, ucred->pid, buf, n, fds);
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+ manager_invoke_notify_message(m, u3, ucred->pid, buf, fds);
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found = true;
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}
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