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AJvYcCV1E7t1LxyH0R6tj45JmyUQbOyAEzOYgFsUWKEq0ZWX/M4ZqFU/xYPPFCPdMNpv7zJLgvlpIbBAHF9kDl6//3ajTZk=@vger.kernel.org X-Gm-Message-State: AOJu0YzwgugEoJSsZ4ud16TAIshyIH8HAvG8gWHE3z03dP/VJZZj8usQ fPvM+UY51P0Sy+FrSnUGiC5/N7NCuc6Kg0Rms3UyRMto8iBEvjDEWlLsDgfUMOPCBb6ZuzXt/Mj TMNg8P8AJCV3f19JIDDBTXg== X-Google-Smtp-Source: AGHT+IGDwbMV0G2Q6eX5Ty92Ruu8G0gWgsOI3nyPGZY41v04cwU8/dEgbGIM8RR7KNaNp8Qt7tiVh+uNmLBvDtT9 X-Received: from wmbep22.prod.google.com ([2002:a05:600c:8416:b0:459:d776:c35d]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:4e51:b0:459:d709:e5a1 with SMTP id 5b1f17b1804b1-45b4dc74ff9mr10294255e9.6.1755764079281; Thu, 21 Aug 2025 01:14:39 -0700 (PDT) Date: Thu, 21 Aug 2025 09:14:02 +0100 In-Reply-To: <20250821081412.1008261-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250821081412.1008261-1-vdonnefort@google.com> X-Mailer: git-send-email 2.51.0.rc2.233.g662b1ed5c5-goog Message-ID: <20250821081412.1008261-15-vdonnefort@google.com> Subject: [PATCH v6 14/24] tracing: Check for undefined symbols in simple_ring_buffer From: Vincent Donnefort To: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org, Vincent Donnefort Content-Type: text/plain; charset="UTF-8" The simple_ring_buffer implementation must remain simple enough to be used by the pKVM hypervisor. Prevent the object build if unresolved symbols are found. Signed-off-by: Vincent Donnefort diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile index 53534447e70b..38523ea2e19b 100644 --- a/kernel/trace/Makefile +++ b/kernel/trace/Makefile @@ -114,4 +114,20 @@ obj-$(CONFIG_TRACE_REMOTE) += trace_remote.o obj-$(CONFIG_SIMPLE_RING_BUFFER) += simple_ring_buffer.o obj-$(CONFIG_TRACE_REMOTE_TEST) += remote_test.o +# +# simple_ring_buffer is used by the pKVM hypervisor which does not have access +# to all kernel symbols. Fail the build if forbidden symbols are found. +# +UNDEFINED_ALLOWLIST := memset alt_cb_patch_nops __x86 __ubsan __asan __kasan __gcov __aeabi_unwind +UNDEFINED_ALLOWLIST += __stack_chk_fail stackleak_track_stack __ref_stack __sanitizer +UNDEFINED_ALLOWLIST := $(addprefix -e , $(UNDEFINED_ALLOWLIST)) + +quiet_cmd_check_undefined = NM $< + cmd_check_undefined = test -z "`$(NM) -u $< | grep -v $(UNDEFINED_ALLOWLIST)`" + +$(obj)/%.o.checked: $(obj)/%.o FORCE + $(call if_changed,check_undefined) + +always-$(CONFIG_SIMPLE_RING_BUFFER) += simple_ring_buffer.o.checked + libftrace-y := ftrace.o -- 2.51.0.rc2.233.g662b1ed5c5-goog