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kcsan: test: don't put the expect array on the stack

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[ Upstream commit 5b24ac2dfd ]

Size of the 'expect' array in the __report_matches is 1536 bytes, which
is exactly the default frame size warning limit of the xtensa
architecture.
As a result allmodconfig xtensa kernel builds with the gcc that does not
support the compiler plugins (which otherwise would push the said
warning limit to 2K) fail with the following message:

  kernel/kcsan/kcsan_test.c:257:1: error: the frame size of 1680 bytes
    is larger than 1536 bytes

Fix it by dynamically allocating the 'expect' array.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Marco Elver <elver@google.com>
Tested-by: Marco Elver <elver@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Max Filippov 2022-12-22 23:28:21 -08:00 committed by Greg Kroah-Hartman
parent c51c0b3754
commit f0e6dcae14
1 changed files with 6 additions and 1 deletions
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7
kernel/kcsan/kcsan_test.c
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@ -151,7 +151,7 @@ static bool report_matches(const struct expect_report *r)
const bool is_assert = (r->access[0].type | r->access[1].type) & KCSAN_ACCESS_ASSERT;
bool ret = false;
unsigned long flags;
typeof(observed.lines) expect;
typeof(*observed.lines) *expect;
const char *end;
char *cur;
int i;
@ -160,6 +160,10 @@ static bool report_matches(const struct expect_report *r)
if (!report_available())
return false;
expect = kmalloc(sizeof(observed.lines), GFP_KERNEL);
if (WARN_ON(!expect))
return false;
/* Generate expected report contents. */
/* Title */
@ -243,6 +247,7 @@ static bool report_matches(const struct expect_report *r)
strstr(observed.lines[2], expect[1])));
out:
spin_unlock_irqrestore(&observed.lock, flags);
kfree(expect);
return ret;
}