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Fri, 10 Jul 2026 15:00:24 -0700 (PDT) Received: from sbertram-thinkpadp1gen5.bos.com ([67.189.222.97]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8ffd5bbac2asm51922246d6.21.2026.07.10.15.00.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Jul 2026 15:00:24 -0700 (PDT) From: Stephen Bertram To: linux-arm-kernel@lists.infradead.org Cc: Stephen Bertram , linux-kselftest@vger.kernel.org Subject: [PATCH] kselftest/arm64/pauth: Scale exec_changed_keys on KSFT_MACHINE_SLOW Date: Fri, 10 Jul 2026 17:59:59 -0400 Message-ID: <20260710220018.719573-1-sbertram@redhat.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit exec_changed_keys performs a fork+exec per PAC_COLLISION_ATTEMPTS iteration. After raising the default to 1000, the test exceeds the 30s kselftest harness timeout on debug kernels. Use a reduced iteration count when KSFT_MACHINE_SLOW=yes, consistent with other kselftests slow-machine handling. Signed-off-by: Stephen Bertram --- tools/testing/selftests/arm64/pauth/pac.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/arm64/pauth/pac.c b/tools/testing/selftests/arm64/pauth/pac.c index f4b859c75a5a..fb9a1e9f8491 100644 --- a/tools/testing/selftests/arm64/pauth/pac.c +++ b/tools/testing/selftests/arm64/pauth/pac.c @@ -14,6 +14,8 @@ #include "helper.h" #define PAC_COLLISION_ATTEMPTS 1000 +/* exec_changed_keys is fork+exec heavy; scale down on slow machines. */ +#define PAC_SLOW_MACHINE_COLLISION_ATTEMPTS 250 /* * The kernel sets TBID by default. So bits 55 and above should remain * untouched no matter what. @@ -36,6 +38,16 @@ do { \ SKIP(return, "Generic PAUTH not enabled"); \ } while (0) +static inline int pac_collision_attempts(void) +{ + const char *slow = getenv("KSFT_MACHINE_SLOW"); + + if (slow && !strcmp(slow, "yes")) + return PAC_SLOW_MACHINE_COLLISION_ATTEMPTS; + + return PAC_COLLISION_ATTEMPTS; +} + void sign_specific(struct signatures *sign, size_t val) { sign->keyia = keyia_sign(val); @@ -301,6 +313,7 @@ TEST(exec_changed_keys) int ret; int same = 10; int nkeys = NKEYS; + int attempts = pac_collision_attempts(); unsigned long hwcaps = getauxval(AT_HWCAP); /* generic and data key instructions are not in NOP space. This prevents a SIGILL */ @@ -309,8 +322,7 @@ TEST(exec_changed_keys) TH_LOG("WARNING: Generic PAUTH not enabled. Skipping generic key checks"); nkeys = NKEYS - 1; } - - for (int i = 0; i < PAC_COLLISION_ATTEMPTS; i++) { + for (int i = 0; i < attempts; i++) { ret = exec_sign_all(&new_keys, i); ASSERT_EQ(0, ret) TH_LOG("failed to run worker"); -- 2.54.0