[PATCH v3 4/5] ima_violations.sh: additional ToMToU violation tests

[Mimi Zohar <zohar@linux.ibm.com>]

Kernel patch "ima: limit the number of ToMToU integrity violations"
prevents superfluous ToMToU violations.  Add corresponding LTP tests.

Link: https://lore.kernel.org/linux-integrity/20250228205505.476845-3-zohar@linux.ibm.com/
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
---
 .../integrity/ima/tests/ima_violations.sh     | 46 ++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/testcases/kernel/security/integrity/ima/tests/ima_violations.sh b/testcases/kernel/security/integrity/ima/tests/ima_violations.sh
index d3081a4d1..0395f8d0a 100755
--- a/testcases/kernel/security/integrity/ima/tests/ima_violations.sh
+++ b/testcases/kernel/security/integrity/ima/tests/ima_violations.sh
@@ -8,7 +8,7 @@
 
 TST_SETUP="setup"
 TST_CLEANUP="cleanup"
-TST_CNT=6
+TST_CNT=8
 
 REQUIRED_BUILTIN_POLICY="tcb"
 REQUIRED_POLICY_CONTENT='violations.policy'
@@ -247,6 +247,50 @@ test6()
 	validate "$num_violations" "$count" "$search" 2
 }
 
+test7()
+{
+	tst_res TINFO "verify limiting single open reader ToMToU violations"
+
+	local search="ToMToU"
+	local count num_violations
+
+	read num_violations < $IMA_VIOLATIONS
+	count="$(get_count $search)"
+
+	open_file_read
+	open_file_write
+	close_file_write
+
+	open_file_write
+	close_file_write
+	close_file_read
+
+	validate "$num_violations" "$count" "$search" 1
+}
+
+test8()
+{
+	tst_res TINFO "verify new open reader causes additional violation"
+
+	local search="ToMToU"
+	local count num_violations
+
+	read num_violations < $IMA_VIOLATIONS
+	count="$(get_count $search)"
+
+	open_file_read
+	open_file_write
+	close_file_write
+	close_file_read
+
+	open_file_read
+	open_file_write
+	close_file_write
+	close_file_read
+
+	validate "$num_violations" "$count" "$search" 2
+}
+
 . ima_setup.sh
 . daemonlib.sh
 tst_run
-- 
2.48.1