Merge tag 'sysctl-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux

Pull sysctl updates from Luis Chamberlain:
 "To help make the move of sysctls out of kernel/sysctl.c not incur a
  size penalty sysctl has been changed to allow us to not require the
  sentinel, the final empty element on the sysctl array. Joel Granados
  has been doing all this work.

  In the v6.6 kernel we got the major infrastructure changes required to
  support this. For v6.7 we had all arch/ and drivers/ modified to
  remove the sentinel. For v6.8-rc1 we get a few more updates for fs/
  directory only.

  The kernel/ directory is left but we'll save that for v6.9-rc1 as
  those patches are still being reviewed. After that we then can expect
  also the removal of the no longer needed check for procname == NULL.

  Let us recap the purpose of this work:

   - this helps reduce the overall build time size of the kernel and run
     time memory consumed by the kernel by about ~64 bytes per array

   - the extra 64-byte penalty is no longer inncurred now when we move
     sysctls out from kernel/sysctl.c to their own files

  Thomas Weißschuh also sent a few cleanups, for v6.9-rc1 we expect to
  see further work by Thomas Weißschuh with the constificatin of the
  struct ctl_table.

  Due to Joel Granados's work, and to help bring in new blood, I have
  suggested for him to become a maintainer and he's accepted. So for
  v6.9-rc1 I look forward to seeing him sent you a pull request for
  further sysctl changes. This also removes Iurii Zaikin as a maintainer
  as he has moved on to other projects and has had no time to help at
  all"

* tag 'sysctl-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux:
  sysctl: remove struct ctl_path
  sysctl: delete unused define SYSCTL_PERM_EMPTY_DIR
  coda: Remove the now superfluous sentinel elements from ctl_table array
  sysctl: Remove the now superfluous sentinel elements from ctl_table array
  fs: Remove the now superfluous sentinel elements from ctl_table array
  cachefiles: Remove the now superfluous sentinel element from ctl_table array
  sysclt: Clarify the results of selftest run
  sysctl: Add a selftest for handling empty dirs
  sysctl: Fix out of bounds access for empty sysctl registers
  MAINTAINERS: Add Joel Granados as co-maintainer for proc sysctl
  MAINTAINERS: remove Iurii Zaikin from proc sysctl

1 files changed, 85 insertions, 61 deletions

diff --git a/tools/testing/selftests/sysctl/sysctl.sh b/tools/testing/selftests/sysctl/sysctl.sh
index 444b2befda82..84472b436c07 100755
--- a/tools/testing/selftests/sysctl/sysctl.sh
+++ b/tools/testing/selftests/sysctl/sysctl.sh
@@ -35,6 +35,7 @@ ALL_TESTS="$ALL_TESTS 0007:1:1:boot_int:1"
 ALL_TESTS="$ALL_TESTS 0008:1:1:match_int:1"
 ALL_TESTS="$ALL_TESTS 0009:1:1:unregister_error:0"
 ALL_TESTS="$ALL_TESTS 0010:1:1:mnt/mnt_error:0"
+ALL_TESTS="$ALL_TESTS 0011:1:1:empty_add:0"
 
 function allow_user_defaults()
 {
@@ -63,7 +64,7 @@ function check_production_sysctl_writes_strict()
 	else
 		old_strict=$(cat ${WRITES_STRICT})
 		if [ "$old_strict" = "1" ]; then
-			echo "ok"
+			echo "OK"
 		else
 			echo "FAIL, strict value is 0 but force to 1 to continue" >&2
 			echo "1" > ${WRITES_STRICT}
@@ -225,7 +226,7 @@ run_numerictests()
 		echo "FAIL" >&2
 		exit 1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	echo -n "Checking sysctl is not set to test value ... "
@@ -233,7 +234,7 @@ run_numerictests()
 		echo "FAIL" >&2
 		exit 1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	echo -n "Writing sysctl from shell ... "
@@ -242,7 +243,7 @@ run_numerictests()
 		echo "FAIL" >&2
 		exit 1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	echo -n "Resetting sysctl to original value ... "
@@ -251,7 +252,7 @@ run_numerictests()
 		echo "FAIL" >&2
 		exit 1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	# Now that we've validated the sanity of "set_test" and "set_orig",
@@ -265,7 +266,7 @@ run_numerictests()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	echo -n "Writing middle of sysctl after synchronized seek ... "
@@ -275,7 +276,7 @@ run_numerictests()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	echo -n "Writing beyond end of sysctl ... "
@@ -285,7 +286,7 @@ run_numerictests()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	echo -n "Writing sysctl with multiple long writes ... "
@@ -296,14 +297,14 @@ run_numerictests()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 }
 
 check_failure()
 {
-	echo -n "Testing that $1 fails as expected..."
+	echo -n "Testing that $1 fails as expected ... "
 	reset_vals
 	TEST_STR="$1"
 	orig="$(cat $TARGET)"
@@ -314,7 +315,7 @@ check_failure()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 }
@@ -356,7 +357,7 @@ run_wideint_tests()
 # Your test must accept digits 3 and 4 to use this
 run_limit_digit()
 {
-	echo -n "Checking ignoring spaces up to PAGE_SIZE works on write ..."
+	echo -n "Checking ignoring spaces up to PAGE_SIZE works on write ... "
 	reset_vals
 
 	LIMIT=$((MAX_DIGITS -1))
@@ -368,11 +369,11 @@ run_limit_digit()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 
-	echo -n "Checking passing PAGE_SIZE of spaces fails on write ..."
+	echo -n "Checking passing PAGE_SIZE of spaces fails on write ... "
 	reset_vals
 
 	LIMIT=$((MAX_DIGITS))
@@ -384,7 +385,7 @@ run_limit_digit()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 }
@@ -392,7 +393,7 @@ run_limit_digit()
 # You are using an int
 run_limit_digit_int()
 {
-	echo -n "Testing INT_MAX works ..."
+	echo -n "Testing INT_MAX works ... "
 	reset_vals
 	TEST_STR="$INT_MAX"
 	echo -n $TEST_STR > $TARGET
@@ -401,11 +402,11 @@ run_limit_digit_int()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 
-	echo -n "Testing INT_MAX + 1 will fail as expected..."
+	echo -n "Testing INT_MAX + 1 will fail as expected ... "
 	reset_vals
 	let TEST_STR=$INT_MAX+1
 	echo -n $TEST_STR > $TARGET 2> /dev/null
@@ -414,11 +415,11 @@ run_limit_digit_int()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 
-	echo -n "Testing negative values will work as expected..."
+	echo -n "Testing negative values will work as expected ... "
 	reset_vals
 	TEST_STR="-3"
 	echo -n $TEST_STR > $TARGET 2> /dev/null
@@ -426,7 +427,7 @@ run_limit_digit_int()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 }
@@ -442,7 +443,7 @@ run_limit_digit_int_array()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 
@@ -459,7 +460,7 @@ run_limit_digit_int_array()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 
@@ -477,7 +478,7 @@ run_limit_digit_int_array()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 
@@ -494,7 +495,7 @@ run_limit_digit_int_array()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 }
@@ -502,7 +503,7 @@ run_limit_digit_int_array()
 # You are using an unsigned int
 run_limit_digit_uint()
 {
-	echo -n "Testing UINT_MAX works ..."
+	echo -n "Testing UINT_MAX works ... "
 	reset_vals
 	TEST_STR="$UINT_MAX"
 	echo -n $TEST_STR > $TARGET
@@ -511,11 +512,11 @@ run_limit_digit_uint()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 
-	echo -n "Testing UINT_MAX + 1 will fail as expected..."
+	echo -n "Testing UINT_MAX + 1 will fail as expected ... "
 	reset_vals
 	TEST_STR=$(($UINT_MAX+1))
 	echo -n $TEST_STR > $TARGET 2> /dev/null
@@ -524,11 +525,11 @@ run_limit_digit_uint()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 
-	echo -n "Testing negative values will not work as expected ..."
+	echo -n "Testing negative values will not work as expected ... "
 	reset_vals
 	TEST_STR="-3"
 	echo -n $TEST_STR > $TARGET 2> /dev/null
@@ -537,7 +538,7 @@ run_limit_digit_uint()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 	test_rc
 }
@@ -551,7 +552,7 @@ run_stringtests()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	echo -n "Writing middle of sysctl after unsynchronized seek ... "
@@ -561,7 +562,7 @@ run_stringtests()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	echo -n "Checking sysctl maxlen is at least $MAXLEN ... "
@@ -572,7 +573,7 @@ run_stringtests()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	echo -n "Checking sysctl keeps original string on overflow append ... "
@@ -583,7 +584,7 @@ run_stringtests()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	echo -n "Checking sysctl stays NULL terminated on write ... "
@@ -594,7 +595,7 @@ run_stringtests()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	echo -n "Checking sysctl stays NULL terminated on overwrite ... "
@@ -605,7 +606,7 @@ run_stringtests()
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 	fi
 
 	test_rc
@@ -650,7 +651,7 @@ run_bitmaptest() {
 		fi
 	done
 
-	echo -n "Checking bitmap handler... "
+	echo -n "Checking bitmap handler ... "
 	TEST_FILE=$(mktemp)
 	echo -n "$TEST_STR" > $TEST_FILE
 
@@ -665,7 +666,7 @@ run_bitmaptest() {
 		echo "FAIL" >&2
 		rc=1
 	else
-		echo "ok"
+		echo "OK"
 		rc=0
 	fi
 	test_rc
@@ -742,89 +743,111 @@ sysctl_test_0006()
 sysctl_test_0007()
 {
 	TARGET="${SYSCTL}/$(get_test_target 0007)"
+	echo -n "Testing if $TARGET is set to 1 ... "
+
 	if [ ! -f $TARGET ]; then
-		echo "Skipping test for $TARGET as it is not present ..."
+		echo -e "SKIPPING\n$TARGET is not present"
 		return $ksft_skip
 	fi
 
 	if [ -d $DIR ]; then
-		echo "Boot param test only possible sysctl_test is built-in, not module:"
+		echo -e "SKIPPING\nTest only possible if 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"
+		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
+		echo -e "SKIPPING\nThere is no /proc/cmdline to check for paramter"
+		return $ksft_skip
 	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"
+		echo -e "FAIL\nKernel param found but $TARGET is not 1." >&2
 		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"
+	echo -e "SKIPPING\nExpected kernel parameter missing."
+	echo "Kernel must be booted with parameter: sysctl.debug.test_sysctl.boot_int=1"
 	return $ksft_skip
 }
 
 sysctl_test_0008()
 {
 	TARGET="${SYSCTL}/$(get_test_target 0008)"
+	echo -n "Testing if $TARGET is matched in kernel ... "
+
 	if [ ! -f $TARGET ]; then
-		echo "Skipping test for $TARGET as it is not present ..."
+		echo -e "SKIPPING\n$TARGET is not present"
 		return $ksft_skip
 	fi
 
-	echo -n "Testing if $TARGET is matched in kernel"
 	ORIG_VALUE=$(cat "${TARGET}")
 
 	if [ $ORIG_VALUE -ne 1 ]; then
-		echo "TEST FAILED"
+		echo "FAIL" >&2
 		rc=1
 		test_rc
 	fi
 
-	echo "ok"
+	echo "OK"
 	return 0
 }
 
 sysctl_test_0009()
 {
 	TARGET="${SYSCTL}/$(get_test_target 0009)"
-	echo -n "Testing if $TARGET unregistered correctly ..."
+	echo -n "Testing if $TARGET unregistered correctly ... "
 	if [ -d $TARGET ]; then
-		echo "TEST FAILED"
+		echo "FAIL" >&2
 		rc=1
 		test_rc
 	fi
 
-	echo "ok"
+	echo "OK"
 	return 0
 }
 
 sysctl_test_0010()
 {
 	TARGET="${SYSCTL}/$(get_test_target 0010)"
-	echo -n "Testing that $TARGET was not created  ..."
+	echo -n "Testing that $TARGET was not created ... "
 	if [ -d $TARGET ]; then
-		echo "TEST FAILED"
+		echo "FAIL" >&2
+		rc=1
+		test_rc
+	fi
+
+	echo "OK"
+	return 0
+}
+
+sysctl_test_0011()
+{
+	TARGET="${SYSCTL}/$(get_test_target 0011)"
+	echo -n "Testing empty dir handling in ${TARGET} ... "
+	if [ ! -d ${TARGET} ]; then
+		echo -e "FAIL\nCould not create ${TARGET}" >&2
+		rc=1
+		test_rc
+	fi
+
+	TARGET2="${TARGET}/empty"
+	if [ ! -d ${TARGET2} ]; then
+		echo -e "FAIL\nCould not create ${TARGET2}" >&2
 		rc=1
 		test_rc
 	fi
 
-	echo "ok"
+	echo "OK"
 	return 0
 }
 
@@ -846,6 +869,7 @@ list_tests()
 	echo "0008 x $(get_test_count 0008) - tests sysctl macro values match"
 	echo "0009 x $(get_test_count 0009) - tests sysct unregister"
 	echo "0010 x $(get_test_count 0010) - tests sysct mount point"
+	echo "0011 x $(get_test_count 0011) - tests empty directories"
 }
 
 usage()
@@ -934,7 +958,7 @@ function skip_test()
 	if target_exists $TEST_TARGET $TEST_ID; then
 		TEST_SKIP=$(get_test_skip_no_target $TEST_ID)
 		if [[ $TEST_SKIP -eq "1" ]]; then
-			echo "Target for test $TEST_ID: $TEST_TARGET not exist, skipping test ..."
+			echo "Target $TEST_TARGET for test $TEST_ID does not exist ... SKIPPING"
 			return 0
 		fi
 	fi