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lib/test_sysctl: support testing of sysctl. boot parameter 

Testing is done by a new parameter debug.test_sysctl.boot_int which
defaults to 0 and it's expected that the tester passes a boot parameter
that sets it to 1.  The test checks if it's set to 1.

To distinguish true failure from parameter not being set, the test
checks /proc/cmdline for the expected parameter, and whether test_sysctl
is built-in and not a module.

[vbabka@suse.cz: skip the new test if boot_int sysctl is not present]
  Link: http://lkml.kernel.org/r/305af605-1e60-cf84-fada-6ce1ca37c102@suse.cz

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: "Eric W . Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Guilherme G . Piccoli" <gpiccoli@canonical.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Ivan Teterevkov <ivan.teterevkov@nutanix.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20200427180433.7029-6-vbabka@suse.cz
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vlastimil Babka 2020-06-07 21:40:38 -07:00 committed by Linus Torvalds
parent 4546cde96f
commit 4f2f682d89
2 changed files with 55 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
lib/test_sysctl.c
View File

@ -44,6 +44,8 @@ struct test_sysctl_data {
int int_0002;
int int_0003[4];
int boot_int;
unsigned int uint_0001;
char string_0001[65];
@ -61,6 +63,8 @@ static struct test_sysctl_data test_data = {
.int_0003[2] = 2,
.int_0003[3] = 3,
.boot_int = 0,
.uint_0001 = 314,
.string_0001 = "(none)",
@ -91,6 +95,15 @@ static struct ctl_table test_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "boot_int",
.data = &test_data.boot_int,
.maxlen = sizeof(test_data.boot_int),
.mode = 0644,
.proc_handler = proc_dointvec,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
{
.procname = "uint_0001",
.data = &test_data.uint_0001,

42
tools/testing/selftests/sysctl/sysctl.sh
View File

@ -39,6 +39,7 @@ ALL_TESTS="$ALL_TESTS 0003:1:1:int_0002"
ALL_TESTS="$ALL_TESTS 0004:1:1:uint_0001"
ALL_TESTS="$ALL_TESTS 0005:3:1:int_0003"
ALL_TESTS="$ALL_TESTS 0006:50:1:bitmap_0001"
ALL_TESTS="$ALL_TESTS 0007:1:1:boot_int"
test_modprobe()
{
@ -752,6 +753,46 @@ sysctl_test_0006()
run_bitmaptest
}
sysctl_test_0007()
{
TARGET="${SYSCTL}/boot_int"
if [ ! -f $TARGET ]; then
echo "Skipping test for $TARGET as it is not present ..."
return $ksft_skip
fi
if [ -d $DIR ]; then
echo "Boot param test only possible sysctl_test is built-in, not module:"
cat $TEST_DIR/config >&2
return $ksft_skip
fi
echo -n "Testing if $TARGET is set to 1 ..."
ORIG=$(cat "${TARGET}")
if [ x$ORIG = "x1" ]; then
echo "ok"
return 0
fi
echo "FAIL"
echo "Checking if /proc/cmdline contains setting of the expected parameter ..."
if [ ! -f /proc/cmdline ]; then
echo "/proc/cmdline does not exist, test inconclusive"
return 0
fi
FOUND=$(grep -c "sysctl[./]debug[./]test_sysctl[./]boot_int=1" /proc/cmdline)
if [ $FOUND = "1" ]; then
echo "Kernel param found but $TARGET is not 1, TEST FAILED"
rc=1
test_rc
fi
echo "Skipping test, expected kernel parameter missing."
echo "To perform this test, make sure kernel is booted with parameter: sysctl.debug.test_sysctl.boot_int=1"
return $ksft_skip
}
list_tests()
{
echo "Test ID list:"
@ -766,6 +807,7 @@ list_tests()
echo "0004 x $(get_test_count 0004) - tests proc_douintvec()"
echo "0005 x $(get_test_count 0005) - tests proc_douintvec() array"
echo "0006 x $(get_test_count 0006) - tests proc_do_large_bitmap()"
echo "0007 x $(get_test_count 0007) - tests setting sysctl from kernel boot param"
}
usage()