Using glibc wrapper on kernel with smaller CONFIG_NR_CPUS (for example
255) leads to segmentation fault in glibc, because it triggers check,
which is verifying that there are no bits set beyond size of kernel cpu
mask:
int
__sched_setaffinity_new (pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset)
...
/* We now know the size of the kernel cpumask_t. Make sure the user
does not request to set a bit beyond that. */
for (size_t cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt)
if (((char *) cpuset)[cnt] != '\0') --> CRASH HERE
Call this syscall directly with ltp_syscall().
Reported-by: Xiaoguang Wang <wangxg.f...@cn.fujitsu.com>
Signed-off-by: Jan Stancek <jstan...@redhat.com>
---
.../sched_setaffinity/sched_setaffinity01.c | 11 ++++++++---
1 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/testcases/kernel/syscalls/sched_setaffinity/sched_setaffinity01.c
b/testcases/kernel/syscalls/sched_setaffinity/sched_setaffinity01.c
index 0ac4478..33a90b8 100644
--- a/testcases/kernel/syscalls/sched_setaffinity/sched_setaffinity01.c
+++ b/testcases/kernel/syscalls/sched_setaffinity/sched_setaffinity01.c
@@ -42,6 +42,7 @@
#include "usctest.h"
#include "safe_macros.h"
#include "sched_setaffinity.h"
+#include "linux_syscall_numbers.h"
char *TCID = "sched_setaffinity01";
@@ -151,9 +152,13 @@ int main(int argc, char *argv[])
for (lc = 0; TEST_LOOPING(lc); lc++) {
tst_count = 0;
for (i = 0; i < TST_TOTAL; i++) {
- TEST(sched_setaffinity(*(test_cases[i].pid),
- *(test_cases[i].mask_size),
- *(test_cases[i].mask)));
+ /* Avoid calling glibc wrapper function, as it may
+ * try to read/validate data in cpu mask. This test
+ * is passing invalid pointer on purpose. */
+ TEST(ltp_syscall(__NR_sched_setaffinity,
+ *(test_cases[i].pid),
+ *(test_cases[i].mask_size),
+ *(test_cases[i].mask)));
if (TEST_RETURN != -1)
tst_resm(TFAIL,
--
1.7.1
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