systemd/SOURCES/0281-shared-cpu-set-util-make-transfer-of-cpu_set_t-over-.patch

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2020-01-21 23:33:31 +00:00
From daa0243fda679c8af723648b8b1e501fc55b0ada Mon Sep 17 00:00:00 2001
From: Michal Sekletar <msekleta@redhat.com>
Date: Wed, 22 May 2019 13:55:49 +0200
Subject: [PATCH] shared/cpu-set-util: make transfer of cpu_set_t over bus
endian safe
(cherry picked from commit c367f996f5f091a63f812f0140b304c649be77fc)
Related: #1734787
---
src/basic/cpu-set-util.c | 38 ++++++++++++++++++++++++++++++++++++++
src/basic/cpu-set-util.h | 3 +++
src/core/dbus-execute.c | 6 +++++-
src/shared/bus-unit-util.c | 8 +++++++-
4 files changed, 53 insertions(+), 2 deletions(-)
diff --git a/src/basic/cpu-set-util.c b/src/basic/cpu-set-util.c
index c297eab032..74e35e57dd 100644
--- a/src/basic/cpu-set-util.c
+++ b/src/basic/cpu-set-util.c
@@ -209,3 +209,41 @@ int cpus_in_affinity_mask(void) {
n *= 2;
}
}
+
+int cpu_set_to_dbus(const CPUSet *set, uint8_t **ret, size_t *allocated) {
+ uint8_t *out;
+
+ assert(set);
+ assert(ret);
+
+ out = new0(uint8_t, set->allocated);
+ if (!out)
+ return -ENOMEM;
+
+ for (unsigned cpu = 0; cpu < set->allocated * 8; cpu++)
+ if (CPU_ISSET_S(cpu, set->allocated, set->set))
+ out[cpu / 8] |= 1u << (cpu % 8);
+
+ *ret = out;
+ *allocated = set->allocated;
+ return 0;
+}
+
+int cpu_set_from_dbus(const uint8_t *bits, size_t size, CPUSet *set) {
+ _cleanup_(cpu_set_reset) CPUSet s = {};
+ int r;
+
+ assert(bits);
+ assert(set);
+
+ for (unsigned cpu = size * 8; cpu > 0; cpu--)
+ if (bits[(cpu - 1) / 8] & (1u << ((cpu - 1) % 8))) {
+ r = cpu_set_add(&s, cpu - 1);
+ if (r < 0)
+ return r;
+ }
+
+ *set = s;
+ s = (CPUSet) {};
+ return 0;
+}
diff --git a/src/basic/cpu-set-util.h b/src/basic/cpu-set-util.h
index 68a73bf9f7..415c6ca295 100644
--- a/src/basic/cpu-set-util.h
+++ b/src/basic/cpu-set-util.h
@@ -46,4 +46,7 @@ static inline int parse_cpu_set(const char *rvalue, CPUSet *cpu_set){
return parse_cpu_set_full(rvalue, cpu_set, false, NULL, NULL, 0, NULL);
}
+int cpu_set_to_dbus(const CPUSet *set, uint8_t **ret, size_t *allocated);
+int cpu_set_from_dbus(const uint8_t *bits, size_t size, CPUSet *set);
+
int cpus_in_affinity_mask(void);
diff --git a/src/core/dbus-execute.c b/src/core/dbus-execute.c
index 08946627e3..50ea71a281 100644
--- a/src/core/dbus-execute.c
+++ b/src/core/dbus-execute.c
@@ -1553,18 +1553,22 @@ int bus_exec_context_set_transient_property(
if (streq(name, "CPUAffinity")) {
const void *a;
size_t n;
+ _cleanup_(cpu_set_reset) CPUSet set = {};
r = sd_bus_message_read_array(message, 'y', &a, &n);
if (r < 0)
return r;
+ r = cpu_set_from_dbus(a, n, &set);
+ if (r < 0)
+ return r;
+
if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
if (n == 0) {
cpu_set_reset(&c->cpu_set);
unit_write_settingf(u, flags, name, "%s=", name);
} else {
_cleanup_free_ char *str = NULL;
- const CPUSet set = {(cpu_set_t*) a, n};
str = cpu_set_to_string(&set);
if (!str)
diff --git a/src/shared/bus-unit-util.c b/src/shared/bus-unit-util.c
index 75b4aace84..ec8732c226 100644
--- a/src/shared/bus-unit-util.c
+++ b/src/shared/bus-unit-util.c
@@ -933,12 +933,18 @@ static int bus_append_execute_property(sd_bus_message *m, const char *field, con
if (streq(field, "CPUAffinity")) {
_cleanup_(cpu_set_reset) CPUSet cpuset = {};
+ _cleanup_free_ uint8_t *array = NULL;
+ size_t allocated;
r = parse_cpu_set(eq, &cpuset);
if (r < 0)
return log_error_errno(r, "Failed to parse %s value: %s", field, eq);
- return bus_append_byte_array(m, field, cpuset.set, cpuset.allocated);
+ r = cpu_set_to_dbus(&cpuset, &array, &allocated);
+ if (r < 0)
+ return log_error_errno(r, "Failed to serialize CPUAffinity: %m");
+
+ return bus_append_byte_array(m, field, array, allocated);
}
if (STR_IN_SET(field, "RestrictAddressFamilies", "SystemCallFilter")) {