linux-toradex.git - Linux kernel for Apalis and Colibri modules

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2026-06-30	perf test: Skip failing 'perf test aslr' test case	Thomas Richter
	The test case 'perf test aslr' fails on s390. The root cause of the failure is subtest test_callchain_aslr. This test invokes command # ./perf record -g -e task-clock:u -o /tmp/perf-test-aslr \ -- perf test -w noploop 3 to generate a call stack using event task-clock:u. On s390 this defaults to '--call-graph dwarf' whereas on x86_64 this defaults to framepointer (fp) format. The command # ./perf inject --aslr -i /tmp/perf-test-aslr now scans all SAMPLE entries recorded in the perf.data file to convert possible addresses. This is done in aslr_tool__process_sample() looking at sample_type bits PERF_SAMPLE_IP, PERF_SAMPLE_TID, PERF_SAMPLE_TIME, PERF_SAMPLE_PERIOD, PERF_SAMPLE_CALLCHAIN, PERF_SAMPLE_REGS_USER and PERF_SAMPLE_STACK_USER. On s390 the samples do not contain FP entries of type PERF_SAMPLE_CALLCHAIN (the bit is set in sample_type, but the number of FP entries is 0). The processing enters the PERF_SAMPLE_STACK_USER portion where the data is copied to the newly constructed sample and then aborted with this warning: /* TODO: can this be less conservative? */ pr_debug("Dropping stack user sample as possible ASLR leak\n"); With command line option '--call-graph dwarf' the new output file does not contain any samples at all. This leads to a missing $new_addr value in the shell script and a failure. Fix this and skip this subtest. Emit a hint that this subtest is currently unsupported on all platform when option --call-graph dwarf is selected. Since one subtest is skipped, the complete test is reported as skipped. Fixes: 190c45463844 ("perf test: Add inject ASLR test") Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Reviewed-by: Ian Rogers <irogers@google.com> Suggested-by: Sumanth Korikkar <sumanthk@linux.ibm.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
2026-06-15	perf test: Add inject ASLR test	Ian Rogers
	Add a new shell test to verify the feature. The test covers: - Basic address remapping for user space samples. - Pipe mode coverage for piped into. - Callchain address remapping. - Consistency of output before and after injection. - Pipe mode report consistency. - Dropping of samples that leak ASLR info (physical addresses). - Kernel address remapping (utilizing a dedicated kernel-intensive VFS dd workload to guarantee continuous timer interrupts sampling flow inside kernel privilege states). - Kernel report consistency with address normalization. The test suite is hardened with global 'set -o pipefail' assertions to catch pipeline failures, stream-consuming awk processors to handle SIGPIPE signals, and a dedicated pipe output scenario validating raw 'perf inject -o -' stdout streams. Note on kernel DSO normalization in the test script: The test script deliberately normalizes all kernel DSOs to a generic [kernel] tag before diffing, as obfuscating physical kernel addresses forces perf report to occasionally shift samples between individual modules and [kernel.kallsyms] due to the lack of valid host module boundary maps. Note on ARM: Kernel-based ASLR test cases (test_kernel_aslr and test_kernel_report_aslr) are skipped on ARM architectures (aarch64 and arm*) to bypass high latency constraints (such as check_invariants() spending excessive execution time in maps__split_kallsyms() on debug builds) and symbolization inconsistencies. Assisted-by: Antigravity:gemini-3.1-pro Signed-off-by: Ian Rogers <irogers@google.com> Tested-by: James Clark <james.clark@linaro.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Gabriel Marin <gmx@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>