From f96142c9f3267a09976cd8a6bb4cc601830bce9b Mon Sep 17 00:00:00 2001
From: Sebastian Kemper <sebastian_ml@gmx.net>
Date: Fri, 21 Oct 2022 23:37:42 +0200
Subject: [PATCH] Use %lld for time_t always
Compiling softflowd against musl 1.2.x for 32 bit targets shows some
warnings:
softflowd.c: In function 'format_flow':
softflowd.c:307:13: warning: format '%ld' expects argument of type 'long int', but argument 15 has type 'suseconds_t' {aka 'long long int'} [-Wformat=]
307 | "seq:%" PRIu64 " [%s]:%hu <> [%s]:%hu proto:%u "
| ^~~~~~~
......
315 | (flow->flow_start.tv_usec + 500) / 1000, fin_time,
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| |
| suseconds_t {aka long long int}
softflowd.c:309:27: note: format string is defined here
309 | "start:%s.%03ld finish:%s.%03ld tcp>:%02x tcp<:%02x "
| ~~~~^
| |
| long int
| %03lld
softflowd.c:307:13: warning: format '%ld' expects argument of type 'long int', but argument 17 has type 'suseconds_t' {aka 'long long int'} [-Wformat=]
307 | "seq:%" PRIu64 " [%s]:%hu <> [%s]:%hu proto:%u "
| ^~~~~~~
......
316 | (flow->flow_last.tv_usec + 500) / 1000, flow->tcp_flags[0],
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| |
| suseconds_t {aka long long int}
softflowd.c:309:43: note: format string is defined here
309 | "start:%s.%03ld finish:%s.%03ld tcp>:%02x tcp<:%02x "
| ~~~~^
| |
| long int
| %03lld
softflowd.c: In function 'dump_flows':
softflowd.c:1173:16: warning: format '%ld' expects argument of type 'long int', but argument 4 has type 'time_t' {aka 'long long int'} [-Wformat=]
1173 | "EXPIRY EVENT for flow %" PRIu64 " in %ld seconds\n",
| ^~~~~~~~~~~~~~~~~~~~~~~~~
1174 | expiry->flow->flow_seq, (long int) expiry->expires_at - now);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| |
| time_t {aka long long int}
softflowd.c:1173:56: note: format string is defined here
1173 | "EXPIRY EVENT for flow %" PRIu64 " in %ld seconds\n",
| ~~^
| |
| long int
| %lld
Dumping flow data results in a segmentation fault:
root@OpenWrt:~# softflowctl dump-flows
softflowd[6688]: Dumping flow data:
No further output. But in the system log a segmentation fault is
visible:
Fri Oct 21 07:13:47 2022 kern.info kernel: [745743.417947] do_page_fault(): sending SIGSEGV to softflowd for invalid read access from 00000326
Fri Oct 21 07:13:47 2022 kern.info kernel: [745743.427175] epc = 77de0dc0 in libc.so[77d62000+a9000]
Fri Oct 21 07:13:47 2022 kern.info kernel: [745743.432682] ra = 77de2b04 in libc.so[77d62000+a9000]
Fri Oct 21 07:13:47 2022 kern.info kernel: [745743.443552] device br-lan.1 left promiscuous mode
Fri Oct 21 07:13:47 2022 kern.info kernel: [745743.448485] device br-lan left promiscuous mode
Fri Oct 21 07:13:52 2022 kern.info kernel: [745748.464316] device br-lan.1 entered promiscuous mode
Fri Oct 21 07:13:52 2022 kern.info kernel: [745748.469774] device br-lan entered promiscuous mode
This was reported on the OpenWrt "packages" repository's issue tracker
([1]).
musl 1.2 has time64 support, meaning it always uses 64 bit time_t (also
when compiling for 32 bit targets), to be Y2K38 safe. This commit
changes the format specifier from "%ld" to "%lld" to fix the compiler
warnings and make the segmentation fault go away.
[1] https://github.com/openwrt/packages/issues/19655
Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>
---
softflowd.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/softflowd.c
+++ b/softflowd.c
@@ -316,14 +316,14 @@ format_flow (struct FLOW *flow) {
snprintf (buf, sizeof (buf),
"seq:%" PRIu64 " [%s]:%hu <> [%s]:%hu proto:%u "
"octets>:%u packets>:%u octets<:%u packets<:%u "
- "start:%s.%03ld finish:%s.%03ld tcp>:%02x tcp<:%02x "
+ "start:%s.%03lld finish:%s.%03lld tcp>:%02x tcp<:%02x "
"flowlabel>:%08x flowlabel<:%08x "
"vlan>:%u vlan<:%u ether:%s <> %s", flow->flow_seq, addr1,
ntohs (flow->port[0]), addr2, ntohs (flow->port[1]),
(int) flow->protocol, flow->octets[0], flow->packets[0],
flow->octets[1], flow->packets[1], start_time,
- (flow->flow_start.tv_usec + 500) / 1000, fin_time,
- (flow->flow_last.tv_usec + 500) / 1000, flow->tcp_flags[0],
+ (long long) ((flow->flow_start.tv_usec + 500) / 1000), fin_time,
+ (long long) ((flow->flow_last.tv_usec + 500) / 1000), flow->tcp_flags[0],
flow->tcp_flags[1], flow->ip6_flowlabel[0],
flow->ip6_flowlabel[1], flow->vlanid[0], flow->vlanid[1],
format_ethermac (flow->ethermac[0]),
@@ -1194,8 +1194,8 @@ dump_flows (struct FLOWTRACK *ft, FILE *
expiry->expires_at == 0 ? " (FORCED)" : "");
} else {
fprintf (out,
- "EXPIRY EVENT for flow %" PRIu64 " in %ld seconds\n",
- expiry->flow->flow_seq, (long int) expiry->expires_at - now);
+ "EXPIRY EVENT for flow %" PRIu64 " in %lld seconds\n",
+ expiry->flow->flow_seq, (long long) expiry->expires_at - now);
}
fprintf (out, "\n");
}