We were wasting a byte due to an off-by-one bug. s[c]nprintf()
doesn't write more than $2 bytes including the null byte, so trying to
pass 'size-1' there is wasting one byte. Now that we use seprintf(),
the situation isn't different: seprintf() will stop writing *before*
'end' --that is, at most the terminating null byte will be written at
'end-1'--.
Fixes: bc8fbc5f305a (2021-02-26; "kfence: add test suite")
Fixes: 8ed691b02ade (2022-10-03; "kmsan: add tests for KMSAN")
Cc: Kees Cook <k...@kernel.org>
Cc: Christopher Bazley <chris.bazley.w...@gmail.com>
Cc: Alexander Potapenko <gli...@google.com>
Cc: Marco Elver <el...@google.com>
Cc: Dmitry Vyukov <dvyu...@google.com>
Cc: Alexander Potapenko <gli...@google.com>
Cc: Jann Horn <ja...@google.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Alejandro Colomar <a...@kernel.org>
---
mm/kfence/kfence_test.c | 4 ++--
mm/kmsan/kmsan_test.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/mm/kfence/kfence_test.c b/mm/kfence/kfence_test.c
index ff734c514c03..f02c3e23638a 100644
--- a/mm/kfence/kfence_test.c
+++ b/mm/kfence/kfence_test.c
@@ -110,7 +110,7 @@ static bool report_matches(const struct expect_report *r)
/* Title */
cur = expect[0];
- end = &expect[0][sizeof(expect[0]) - 1];
+ end = ENDOF(expect[0]);
switch (r->type) {
case KFENCE_ERROR_OOB:
cur = seprintf(cur, end, "BUG: KFENCE: out-of-bounds %s",
@@ -140,7 +140,7 @@ static bool report_matches(const struct expect_report *r)
/* Access information */
cur = expect[1];
- end = &expect[1][sizeof(expect[1]) - 1];
+ end = ENDOF(expect[1]);
switch (r->type) {
case KFENCE_ERROR_OOB:
diff --git a/mm/kmsan/kmsan_test.c b/mm/kmsan/kmsan_test.c
index a062a46b2d24..882500807db8 100644
--- a/mm/kmsan/kmsan_test.c
+++ b/mm/kmsan/kmsan_test.c
@@ -105,7 +105,7 @@ static bool report_matches(const struct expect_report *r)
/* Title */
cur = expected_header;
- end = &expected_header[sizeof(expected_header) - 1];
+ end = ENDOF(expected_header);
cur = seprintf(cur, end, "BUG: KMSAN: %s", r->error_type);
--
2.50.0
