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/linux/Documentation/dev-tools/
H A Dkcov.rst1 KCOV: code coverage for fuzzing
4 KCOV collects and exposes kernel code coverage information in a form suitable
5 for coverage-guided fuzzing. Coverage data of a running kernel is exported via
6 the ``kcov`` debugfs file. Coverage collection is enabled on a task basis, and
7 thus KCOV can capture precise coverage of a single system call.
9 Note that KCOV does not aim to collect as much coverage as possible. It aims
10 to collect more or less stable coverage that is a function of syscall inputs.
11 To achieve this goal, it does not collect coverage in soft/hard interrupts
12 (unless remove coverage collection is enabled, see below) and from some
15 Besides collecting code coverage, KCOV can also collect comparison operands.
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H A Dgcov.rst4 gcov profiling kernel support enables the use of GCC's coverage testing
5 tool gcov_ with the Linux kernel. Coverage data of a running kernel
7 To get coverage data for a specific file, change to the kernel build
16 for the entire kernel and provide coverage overviews in HTML format.
37 and to get coverage data for the entire kernel::
86 generate coverage reports. If left unset the report is omitted.
98 Global reset file: resets all coverage data to zero when
103 tool. Resets file coverage data to zero when written to.
108 option ``-ftest-coverage``.
116 coverage data for such code by keeping a copy of the data associated
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H A Dtesting-overview.rst66 Code Coverage Tools
69 The Linux Kernel supports two different code coverage measurement tools. These
74 Documentation/dev-tools/gcov.rst is GCC's coverage testing tool, which can be
75 used with the kernel to get global or per-module coverage. Unlike KCOV, it
76 does not record per-task coverage. Coverage data can be read from debugfs,
80 kernel to allow capturing coverage on a per-task level. It's therefore useful
/linux/Documentation/networking/
H A Dudplite.rst37 IPPROTO need to be changed; senders additionally set the checksum coverage
58 using partial checksum coverage and so emulate UDP mode (full coverage).
60 To make use of the partial checksum coverage facilities requires setting a
61 single socket option, which takes an integer specifying the coverage length:
63 * Sender checksum coverage: UDPLITE_SEND_CSCOV
70 sets the checksum coverage length to 20 bytes (12b data + 8b header).
76 * Receiver checksum coverage: UDPLITE_RECV_CSCOV
79 required to enable traffic with partial checksum coverage. Its function is
81 all packets which have a coverage _less_ than this value. For example, if
83 packets with a minimum coverage of 20 are admitted::
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/linux/kernel/
H A Dkcov.c52 * - task with enabled coverage (we can't unwire it from another task)
53 * - each code section for remote coverage collection
61 /* Coverage buffer shared with user space. */
63 /* Task for which we collect coverage, or NULL. */
65 /* Collecting coverage from remote (background) threads. */
179 * We are interested in code coverage as a function of a syscall inputs, in check_kcov_mode()
181 * coverage collection section in a softirq. in check_kcov_mode()
464 * shouldn't be exiting when it's in a kcov coverage collection in kcov_task_exit()
466 * coverage, and t->kcov->t points to the thread that created the in kcov_task_exit()
597 * Enable coverage for the current task. in kcov_ioctl_locked()
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/linux/Documentation/dev-tools/kunit/
H A Drunning_tips.rst100 Generating code coverage reports under UML
108 This is different from the "normal" way of getting coverage information that is
125 # Append coverage options to the current config
127 # Extract the coverage information from the build dir (.kunit/)
128 $ lcov -t "my_kunit_tests" -o coverage.info -c -d .kunit/
132 $ genhtml -o /tmp/coverage_html coverage.info
140 $ lcov -t "my_kunit_tests" -o coverage.info -c -d .kunit/ --gcov-tool=/usr/bin/gcov-6
146 # Build with LLVM and append coverage options to the current config
149 $ llvm-cov export --format=lcov .kunit/vmlinux -instr-profile default.profdata > coverage.info
150 …# The coverage.info file is in lcov-compatible format and it can be used to e.g. generate HTML rep…
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/linux/include/net/
H A Dudplite.h12 #define UDPLITE_SEND_CSCOV 10 /* sender partial coverage (as sent) */
13 #define UDPLITE_RECV_CSCOV 11 /* receiver partial coverage (threshold ) */
45 if (cscov == 0) /* Indicates that full coverage is required. */ in udplite_checksum_init()
49 * Coverage length violates RFC 3828: log and discard silently. in udplite_checksum_init()
51 net_dbg_ratelimited("UDPLite: bad csum coverage %d/%d\n", in udplite_checksum_init()
/linux/tools/testing/selftests/net/rds/
H A Drun.sh67 # Check to see if the kconfig has the required configs to generate a coverage report
71 echo "INFO: CONFIG_GCOV_PROFILE_RDS should be enabled for coverage reports"
75 echo "INFO: CONFIG_GCOV_KERNEL should be enabled for coverage reports"
79 echo "INFO: CONFIG_GCOV_PROFILE_ALL should be disabled for coverage reports"
189 COVR_DIR="${LOG_DIR}/coverage/"
204 echo saving coverage data...
215 echo "Coverage report will be skipped"
H A DREADME.txt4 These scripts provide a coverage test for RDS-TCP by creating two
11 kernel may optionally be configured to omit the coverage report as well.
41 An HTML coverage report will be output in tools/testing/selftests/net/rds/rds_logs/coverage/.
/linux/tools/perf/util/
H A Dblock-range.c173 .coverage = entry->coverage, in block_range__create()
211 .coverage = entry->coverage, in block_range__create()
301 * Compute coverage as:
303 * br->coverage / br->sym->max_coverage
308 * Returns [0-1] for coverage and -1 if we had no data what so ever or the
331 return (double)br->coverage / branch->max_coverage; in block_range__coverage()
H A Dblock-range.h18 * @coverage: number of blocks that cover this range
32 u64 coverage; member
/linux/arch/arm/probes/kprobes/
H A Dtest-core.c670 * Decoding table test coverage analysis
703 struct coverage_table coverage; variable
736 struct coverage_table *coverage = (struct coverage_table *)args; in coverage_start_fn() local
738 struct coverage_entry *entry = coverage->base + coverage->num_entries; in coverage_start_fn()
740 if (coverage->num_entries == MAX_COVERAGE_ENTRIES - 1) { in coverage_start_fn()
741 pr_err("FAIL: Out of space for test coverage data"); in coverage_start_fn()
745 ++coverage->num_entries; in coverage_start_fn()
749 entry->nesting = coverage->nesting; in coverage_start_fn()
755 ++coverage->nesting; in coverage_start_fn()
756 ret = table_iter(d->table.table, coverage_start_fn, coverage); in coverage_start_fn()
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/linux/scripts/
H A DMakefile.kstack_erase12 kstack-erase-cflags-y += -fsanitize-coverage=stack-depth
13 kstack-erase-cflags-y += -fsanitize-coverage-stack-depth-callback-min=$(CONFIG_KSTACK_ERASE_TRACK_M…
14 DISABLE_KSTACK_ERASE := -fno-sanitize-coverage=stack-depth
H A DMakefile.compiler79 …LAGS += $(call __rustc-option,$(RUSTC),$(MY_RUSTFLAGS),-Cinstrument-coverage,-Zinstrument-coverage)
87 # Usage: rustflags-y += $(call rustc-option,-Cinstrument-coverage,-Zinstrument-coverage)
92 # Usage: flag := $(call rustc-option-yn,-Cinstrument-coverage)
H A DMakefile.kcov2 kcov-flags-y += -fsanitize-coverage=trace-pc
3 kcov-flags-$(CONFIG_KCOV_ENABLE_COMPARISONS) += -fsanitize-coverage=trace-cmp
6 kcov-rflags-y += -Cllvm-args=-sanitizer-coverage-level=3
7 kcov-rflags-y += -Cllvm-args=-sanitizer-coverage-trace-pc
8 kcov-rflags-$(CONFIG_KCOV_ENABLE_COMPARISONS) += -Cllvm-args=-sanitizer-coverage-trace-compares
/linux/include/linux/
H A Dcompiler-clang.h102 * with no_sanitize("coverage"). Prior versions of Clang support coverage
106 #define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
111 /* Only Clang needs to disable the coverage sanitizer for kstack_erase. */
H A Dkcov.h13 /* Coverage collection is not enabled yet. */
18 * Tracing coverage collection mode.
60 * work around for kcov's lack of nested remote coverage sections support in
/linux/drivers/of/
H A DKconfig17 compile-coverage.
89 can enable it manually to improve device tree unit test coverage.
114 enable it manually to improve device tree unit test coverage.
/linux/include/uapi/linux/
H A Dkcov.h13 __u32 area_size; /* Length of coverage buffer in words */
28 * Tracing coverage collection mode.
/linux/arch/x86/um/vdso/
H A DMakefile50 CFLAGS_REMOVE_vdso-note.o = -pg -fprofile-arcs -ftest-coverage
51 CFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage
/linux/security/
H A DKconfig.hardening29 greatest coverage (since all functions can have their
34 This chooses the level of coverage over classes of potentially
86 def_bool $(cc-option,-fsanitize-coverage-stack-depth-callback-min=1)
124 instrumented. This is useful for comparing coverage between
/linux/tools/testing/selftests/arm64/fp/
H A DREADME61 to maximise test coverage.
96 maximise test coverage.
H A DTODO2 - More coverage for ptrace:
/linux/kernel/trace/
H A DMakefile29 # for GCOV coverage profiling
35 # code and produce random code coverage.
/linux/drivers/net/wireless/ath/ath10k/
H A Dhw.c589 /* The firmware does not support setting the coverage class. Instead this
632 /* Break out if the coverage class and registers have the expected in ath10k_hw_qca988x_set_coverage_class()
655 "failed to set coverage class: expected integer microsecond value in register\n"); in ath10k_hw_qca988x_set_coverage_class()
664 … "failed to set coverage class: expected slot time of 9 or 20us in HW register. It is %uus.\n", in ath10k_hw_qca988x_set_coverage_class()
671 * delay (3us per coverage class). in ath10k_hw_qca988x_set_coverage_class()
702 * coverage class is larger than 0. This is important as we need to in ath10k_hw_qca988x_set_coverage_class()
718 /* After an error we will not retry setting the coverage class. */ in ath10k_hw_qca988x_set_coverage_class()

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