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authorAlexey Dobriyan <adobriyan@gmail.com>2018-04-10 16:31:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-11 10:28:34 -0700
commitc4219edf1de2af44fd98903f72f6e1ceb7f3c701 (patch)
treebc998b5b7696df378254d6fe62f274c1884c58b5 /tools/testing
parentproc: test /proc/self/wchan (diff)
downloadlinux-dev-c4219edf1de2af44fd98903f72f6e1ceb7f3c701.tar.xz
linux-dev-c4219edf1de2af44fd98903f72f6e1ceb7f3c701.zip
proc: test /proc/self/syscall
Read from /proc/self/syscall should yield read system call and correct args in the output as current is reading /proc/self/syscall. Link: http://lkml.kernel.org/r/20180226212145.GB742@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/testing')
-rw-r--r--tools/testing/selftests/proc/.gitignore3
-rw-r--r--tools/testing/selftests/proc/Makefile1
-rw-r--r--tools/testing/selftests/proc/proc-self-syscall.c45
3 files changed, 48 insertions, 1 deletions
diff --git a/tools/testing/selftests/proc/.gitignore b/tools/testing/selftests/proc/.gitignore
index 4c851db80bd5..c648b27af2e7 100644
--- a/tools/testing/selftests/proc/.gitignore
+++ b/tools/testing/selftests/proc/.gitignore
@@ -1 +1,2 @@
-/proc-self-wchan
+/proc-self-mem
+/proc-self-syscall
diff --git a/tools/testing/selftests/proc/Makefile b/tools/testing/selftests/proc/Makefile
index 592603a5d675..ad20520910e2 100644
--- a/tools/testing/selftests/proc/Makefile
+++ b/tools/testing/selftests/proc/Makefile
@@ -1,6 +1,7 @@
CFLAGS += -Wall -O2
TEST_GEN_PROGS :=
+TEST_GEN_PROGS += proc-self-syscall
TEST_GEN_PROGS += proc-self-wchan
include ../lib.mk
diff --git a/tools/testing/selftests/proc/proc-self-syscall.c b/tools/testing/selftests/proc/proc-self-syscall.c
new file mode 100644
index 000000000000..05eb6f91f1e9
--- /dev/null
+++ b/tools/testing/selftests/proc/proc-self-syscall.c
@@ -0,0 +1,45 @@
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+
+static inline ssize_t sys_read(int fd, void *buf, size_t len)
+{
+ return syscall(SYS_read, fd, buf, len);
+}
+
+int main(void)
+{
+ char buf1[64];
+ char buf2[64];
+ int fd;
+ ssize_t rv;
+
+ fd = open("/proc/self/syscall", O_RDONLY);
+ if (fd == -1) {
+ if (errno == ENOENT)
+ return 2;
+ return 1;
+ }
+
+ /* Do direct system call as libc can wrap anything. */
+ snprintf(buf1, sizeof(buf1), "%ld 0x%lx 0x%lx 0x%lx",
+ (long)SYS_read, (long)fd, (long)buf2, (long)sizeof(buf2));
+
+ memset(buf2, 0, sizeof(buf2));
+ rv = sys_read(fd, buf2, sizeof(buf2));
+ if (rv < 0)
+ return 1;
+ if (rv < strlen(buf1))
+ return 1;
+ if (strncmp(buf1, buf2, strlen(buf1)) != 0)
+ return 1;
+
+ return 0;
+}