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| author | Vincent Donnefort <vdonnefort@google.com> | 2026-03-09 16:25:04 +0000 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2026-03-09 12:33:55 -0400 |
| commit | a717943d8ecc0e533c581bf04473b50f6f17f2cb (patch) | |
| tree | 11631d43e3411ad6fc4537572e31765112afdd1d /kernel/trace | |
| parent | 635923081c792c830fb87e680d6dd5f348926b3f (diff) | |
| download | linux-a717943d8ecc0e533c581bf04473b50f6f17f2cb.tar.gz linux-a717943d8ecc0e533c581bf04473b50f6f17f2cb.zip | |
tracing: Check for undefined symbols in simple_ring_buffer
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.
Link: https://patch.msgid.link/20260309162516.2623589-19-vdonnefort@google.com
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/Makefile | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile index d106beca8d7f..3182e1bc1cf7 100644 --- a/kernel/trace/Makefile +++ b/kernel/trace/Makefile @@ -132,4 +132,20 @@ 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 |