This is a note to let you know that I've just added the patch titled
tools/power turbostat: Avoid possible memory corruption due to sparse topology IDs
to the 6.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tools-power-turbostat-avoid-possible-memory-corrupti.patch
and it can be found in the queue-6.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d6233fac32c4d8479cecfa2bb922bcacf17ab950
Author: Patryk Wlazlyn <patryk.wlazlyn@xxxxxxxxxxxxxxx>
Date: Mon May 6 15:39:08 2024 +0200
tools/power turbostat: Avoid possible memory corruption due to sparse topology IDs
[ Upstream commit 3559ea813ad3a9627934325c68ad05b18008a077 ]
Save the highest core and package id when parsing topology to
allocate enough memory when get_rapl_counters() is called with a core or
a package id as a domain.
Note that RAPL domains are per-package on Intel, but per-core on AMD.
Thus, the RAPL code effectively runs in different modes on those two
product lines.
Signed-off-by: Patryk Wlazlyn <patryk.wlazlyn@xxxxxxxxxxxxxxx>
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 25417c3a47ab6..5d80d193e5bee 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -1022,6 +1022,7 @@ struct rapl_counter_info_t {
/* struct rapl_counter_info_t for each RAPL domain */
struct rapl_counter_info_t *rapl_counter_info_perdomain;
+unsigned int rapl_counter_info_perdomain_size;
#define RAPL_COUNTER_FLAG_USE_MSR_SUM (1u << 1)
@@ -1415,6 +1416,8 @@ struct topo_params {
int allowed_cpus;
int allowed_cores;
int max_cpu_num;
+ int max_core_id;
+ int max_package_id;
int max_die_id;
int max_node_num;
int nodes_per_pkg;
@@ -3369,15 +3372,18 @@ void write_rapl_counter(struct rapl_counter *rc, struct rapl_counter_info_t *rci
rc->scale = rci->scale[idx];
}
-int get_rapl_counters(int cpu, int domain, struct core_data *c, struct pkg_data *p)
+int get_rapl_counters(int cpu, unsigned int domain, struct core_data *c, struct pkg_data *p)
{
unsigned long long perf_data[NUM_RAPL_COUNTERS + 1];
- struct rapl_counter_info_t *rci = &rapl_counter_info_perdomain[domain];
+ struct rapl_counter_info_t *rci;
if (debug)
fprintf(stderr, "%s: cpu%d domain%d\n", __func__, cpu, domain);
assert(rapl_counter_info_perdomain);
+ assert(domain < rapl_counter_info_perdomain_size);
+
+ rci = &rapl_counter_info_perdomain[domain];
/*
* If we have any perf counters to read, read them all now, in bulk
@@ -4181,7 +4187,7 @@ void free_fd_rapl_percpu(void)
if (!rapl_counter_info_perdomain)
return;
- const int num_domains = platform->has_per_core_rapl ? topo.num_cores : topo.num_packages;
+ const int num_domains = rapl_counter_info_perdomain_size;
for (int domain_id = 0; domain_id < num_domains; ++domain_id) {
if (rapl_counter_info_perdomain[domain_id].fd_perf != -1)
@@ -4189,6 +4195,8 @@ void free_fd_rapl_percpu(void)
}
free(rapl_counter_info_perdomain);
+ rapl_counter_info_perdomain = NULL;
+ rapl_counter_info_perdomain_size = 0;
}
void free_all_buffers(void)
@@ -6479,17 +6487,18 @@ void linux_perf_init(void)
void rapl_perf_init(void)
{
- const int num_domains = platform->has_per_core_rapl ? topo.num_cores : topo.num_packages;
+ const unsigned int num_domains = (platform->has_per_core_rapl ? topo.max_core_id : topo.max_package_id) + 1;
bool *domain_visited = calloc(num_domains, sizeof(bool));
rapl_counter_info_perdomain = calloc(num_domains, sizeof(*rapl_counter_info_perdomain));
if (rapl_counter_info_perdomain == NULL)
err(-1, "calloc rapl_counter_info_percpu");
+ rapl_counter_info_perdomain_size = num_domains;
/*
* Initialize rapl_counter_info_percpu
*/
- for (int domain_id = 0; domain_id < num_domains; ++domain_id) {
+ for (unsigned int domain_id = 0; domain_id < num_domains; ++domain_id) {
struct rapl_counter_info_t *rci = &rapl_counter_info_perdomain[domain_id];
rci->fd_perf = -1;
@@ -6509,7 +6518,7 @@ void rapl_perf_init(void)
bool has_counter = 0;
double scale;
enum rapl_unit unit;
- int next_domain;
+ unsigned int next_domain;
memset(domain_visited, 0, num_domains * sizeof(*domain_visited));
@@ -6522,6 +6531,8 @@ void rapl_perf_init(void)
next_domain =
platform->has_per_core_rapl ? cpus[cpu].physical_core_id : cpus[cpu].physical_package_id;
+ assert(next_domain < num_domains);
+
if (domain_visited[next_domain])
continue;
@@ -7104,6 +7115,8 @@ void topology_probe(bool startup)
if (cpus[i].thread_id == 0)
topo.num_cores++;
}
+ topo.max_core_id = max_core_id;
+ topo.max_package_id = max_package_id;
topo.cores_per_node = max_core_id + 1;
if (debug > 1)
