| # SPDX-License-Identifier: GPL-2.0+ |
| # Copyright (c) 2013, Google Inc. |
| # |
| # Sanity check of the FIT handling in U-Boot |
| |
| import os |
| import pytest |
| import struct |
| import u_boot_utils as util |
| |
| # Define a base ITS which we can adjust using % and a dictionary |
| base_its = ''' |
| /dts-v1/; |
| |
| / { |
| description = "Chrome OS kernel image with one or more FDT blobs"; |
| #address-cells = <1>; |
| |
| images { |
| kernel@1 { |
| data = /incbin/("%(kernel)s"); |
| type = "kernel"; |
| arch = "sandbox"; |
| os = "linux"; |
| compression = "none"; |
| load = <0x40000>; |
| entry = <0x8>; |
| }; |
| kernel@2 { |
| data = /incbin/("%(loadables1)s"); |
| type = "kernel"; |
| arch = "sandbox"; |
| os = "linux"; |
| compression = "none"; |
| %(loadables1_load)s |
| entry = <0x0>; |
| }; |
| fdt@1 { |
| description = "snow"; |
| data = /incbin/("u-boot.dtb"); |
| type = "flat_dt"; |
| arch = "sandbox"; |
| %(fdt_load)s |
| compression = "none"; |
| signature@1 { |
| algo = "sha1,rsa2048"; |
| key-name-hint = "dev"; |
| }; |
| }; |
| ramdisk@1 { |
| description = "snow"; |
| data = /incbin/("%(ramdisk)s"); |
| type = "ramdisk"; |
| arch = "sandbox"; |
| os = "linux"; |
| %(ramdisk_load)s |
| compression = "none"; |
| }; |
| ramdisk@2 { |
| description = "snow"; |
| data = /incbin/("%(loadables2)s"); |
| type = "ramdisk"; |
| arch = "sandbox"; |
| os = "linux"; |
| %(loadables2_load)s |
| compression = "none"; |
| }; |
| }; |
| configurations { |
| default = "conf@1"; |
| conf@1 { |
| kernel = "kernel@1"; |
| fdt = "fdt@1"; |
| %(ramdisk_config)s |
| %(loadables_config)s |
| }; |
| }; |
| }; |
| ''' |
| |
| # Define a base FDT - currently we don't use anything in this |
| base_fdt = ''' |
| /dts-v1/; |
| |
| / { |
| model = "Sandbox Verified Boot Test"; |
| compatible = "sandbox"; |
| |
| reset@0 { |
| compatible = "sandbox,reset"; |
| }; |
| |
| }; |
| ''' |
| |
| # This is the U-Boot script that is run for each test. First load the FIT, |
| # then run the 'bootm' command, then save out memory from the places where |
| # we expect 'bootm' to write things. Then quit. |
| base_script = ''' |
| sb load hostfs 0 %(fit_addr)x %(fit)s |
| fdt addr %(fit_addr)x |
| bootm start %(fit_addr)x |
| bootm loados |
| sb save hostfs 0 %(kernel_addr)x %(kernel_out)s %(kernel_size)x |
| sb save hostfs 0 %(fdt_addr)x %(fdt_out)s %(fdt_size)x |
| sb save hostfs 0 %(ramdisk_addr)x %(ramdisk_out)s %(ramdisk_size)x |
| sb save hostfs 0 %(loadables1_addr)x %(loadables1_out)s %(loadables1_size)x |
| sb save hostfs 0 %(loadables2_addr)x %(loadables2_out)s %(loadables2_size)x |
| ''' |
| |
| @pytest.mark.boardspec('sandbox') |
| @pytest.mark.buildconfigspec('fit_signature') |
| @pytest.mark.requiredtool('dtc') |
| def test_fit(u_boot_console): |
| def make_fname(leaf): |
| """Make a temporary filename |
| |
| Args: |
| leaf: Leaf name of file to create (within temporary directory) |
| Return: |
| Temporary filename |
| """ |
| |
| return os.path.join(cons.config.build_dir, leaf) |
| |
| def filesize(fname): |
| """Get the size of a file |
| |
| Args: |
| fname: Filename to check |
| Return: |
| Size of file in bytes |
| """ |
| return os.stat(fname).st_size |
| |
| def read_file(fname): |
| """Read the contents of a file |
| |
| Args: |
| fname: Filename to read |
| Returns: |
| Contents of file as a string |
| """ |
| with open(fname, 'r') as fd: |
| return fd.read() |
| |
| def make_dtb(): |
| """Make a sample .dts file and compile it to a .dtb |
| |
| Returns: |
| Filename of .dtb file created |
| """ |
| src = make_fname('u-boot.dts') |
| dtb = make_fname('u-boot.dtb') |
| with open(src, 'w') as fd: |
| print >> fd, base_fdt |
| util.run_and_log(cons, ['dtc', src, '-O', 'dtb', '-o', dtb]) |
| return dtb |
| |
| def make_its(params): |
| """Make a sample .its file with parameters embedded |
| |
| Args: |
| params: Dictionary containing parameters to embed in the %() strings |
| Returns: |
| Filename of .its file created |
| """ |
| its = make_fname('test.its') |
| with open(its, 'w') as fd: |
| print >> fd, base_its % params |
| return its |
| |
| def make_fit(mkimage, params): |
| """Make a sample .fit file ready for loading |
| |
| This creates a .its script with the selected parameters and uses mkimage to |
| turn this into a .fit image. |
| |
| Args: |
| mkimage: Filename of 'mkimage' utility |
| params: Dictionary containing parameters to embed in the %() strings |
| Return: |
| Filename of .fit file created |
| """ |
| fit = make_fname('test.fit') |
| its = make_its(params) |
| util.run_and_log(cons, [mkimage, '-f', its, fit]) |
| with open(make_fname('u-boot.dts'), 'w') as fd: |
| print >> fd, base_fdt |
| return fit |
| |
| def make_kernel(filename, text): |
| """Make a sample kernel with test data |
| |
| Args: |
| filename: the name of the file you want to create |
| Returns: |
| Full path and filename of the kernel it created |
| """ |
| fname = make_fname(filename) |
| data = '' |
| for i in range(100): |
| data += 'this %s %d is unlikely to boot\n' % (text, i) |
| with open(fname, 'w') as fd: |
| print >> fd, data |
| return fname |
| |
| def make_ramdisk(filename, text): |
| """Make a sample ramdisk with test data |
| |
| Returns: |
| Filename of ramdisk created |
| """ |
| fname = make_fname(filename) |
| data = '' |
| for i in range(100): |
| data += '%s %d was seldom used in the middle ages\n' % (text, i) |
| with open(fname, 'w') as fd: |
| print >> fd, data |
| return fname |
| |
| def find_matching(text, match): |
| """Find a match in a line of text, and return the unmatched line portion |
| |
| This is used to extract a part of a line from some text. The match string |
| is used to locate the line - we use the first line that contains that |
| match text. |
| |
| Once we find a match, we discard the match string itself from the line, |
| and return what remains. |
| |
| TODO: If this function becomes more generally useful, we could change it |
| to use regex and return groups. |
| |
| Args: |
| text: Text to check (list of strings, one for each command issued) |
| match: String to search for |
| Return: |
| String containing unmatched portion of line |
| Exceptions: |
| ValueError: If match is not found |
| |
| >>> find_matching(['first line:10', 'second_line:20'], 'first line:') |
| '10' |
| >>> find_matching(['first line:10', 'second_line:20'], 'second line') |
| Traceback (most recent call last): |
| ... |
| ValueError: Test aborted |
| >>> find_matching('first line:10\', 'second_line:20'], 'second_line:') |
| '20' |
| >>> find_matching('first line:10\', 'second_line:20\nthird_line:30'], |
| 'third_line:') |
| '30' |
| """ |
| __tracebackhide__ = True |
| for line in '\n'.join(text).splitlines(): |
| pos = line.find(match) |
| if pos != -1: |
| return line[:pos] + line[pos + len(match):] |
| |
| pytest.fail("Expected '%s' but not found in output") |
| |
| def check_equal(expected_fname, actual_fname, failure_msg): |
| """Check that a file matches its expected contents |
| |
| Args: |
| expected_fname: Filename containing expected contents |
| actual_fname: Filename containing actual contents |
| failure_msg: Message to print on failure |
| """ |
| expected_data = read_file(expected_fname) |
| actual_data = read_file(actual_fname) |
| assert expected_data == actual_data, failure_msg |
| |
| def check_not_equal(expected_fname, actual_fname, failure_msg): |
| """Check that a file does not match its expected contents |
| |
| Args: |
| expected_fname: Filename containing expected contents |
| actual_fname: Filename containing actual contents |
| failure_msg: Message to print on failure |
| """ |
| expected_data = read_file(expected_fname) |
| actual_data = read_file(actual_fname) |
| assert expected_data != actual_data, failure_msg |
| |
| def run_fit_test(mkimage): |
| """Basic sanity check of FIT loading in U-Boot |
| |
| TODO: Almost everything: |
| - hash algorithms - invalid hash/contents should be detected |
| - signature algorithms - invalid sig/contents should be detected |
| - compression |
| - checking that errors are detected like: |
| - image overwriting |
| - missing images |
| - invalid configurations |
| - incorrect os/arch/type fields |
| - empty data |
| - images too large/small |
| - invalid FDT (e.g. putting a random binary in instead) |
| - default configuration selection |
| - bootm command line parameters should have desired effect |
| - run code coverage to make sure we are testing all the code |
| """ |
| # Set up invariant files |
| control_dtb = make_dtb() |
| kernel = make_kernel('test-kernel.bin', 'kernel') |
| ramdisk = make_ramdisk('test-ramdisk.bin', 'ramdisk') |
| loadables1 = make_kernel('test-loadables1.bin', 'lenrek') |
| loadables2 = make_ramdisk('test-loadables2.bin', 'ksidmar') |
| kernel_out = make_fname('kernel-out.bin') |
| fdt_out = make_fname('fdt-out.dtb') |
| ramdisk_out = make_fname('ramdisk-out.bin') |
| loadables1_out = make_fname('loadables1-out.bin') |
| loadables2_out = make_fname('loadables2-out.bin') |
| |
| # Set up basic parameters with default values |
| params = { |
| 'fit_addr' : 0x1000, |
| |
| 'kernel' : kernel, |
| 'kernel_out' : kernel_out, |
| 'kernel_addr' : 0x40000, |
| 'kernel_size' : filesize(kernel), |
| |
| 'fdt_out' : fdt_out, |
| 'fdt_addr' : 0x80000, |
| 'fdt_size' : filesize(control_dtb), |
| 'fdt_load' : '', |
| |
| 'ramdisk' : ramdisk, |
| 'ramdisk_out' : ramdisk_out, |
| 'ramdisk_addr' : 0xc0000, |
| 'ramdisk_size' : filesize(ramdisk), |
| 'ramdisk_load' : '', |
| 'ramdisk_config' : '', |
| |
| 'loadables1' : loadables1, |
| 'loadables1_out' : loadables1_out, |
| 'loadables1_addr' : 0x100000, |
| 'loadables1_size' : filesize(loadables1), |
| 'loadables1_load' : '', |
| |
| 'loadables2' : loadables2, |
| 'loadables2_out' : loadables2_out, |
| 'loadables2_addr' : 0x140000, |
| 'loadables2_size' : filesize(loadables2), |
| 'loadables2_load' : '', |
| |
| 'loadables_config' : '', |
| } |
| |
| # Make a basic FIT and a script to load it |
| fit = make_fit(mkimage, params) |
| params['fit'] = fit |
| cmd = base_script % params |
| |
| # First check that we can load a kernel |
| # We could perhaps reduce duplication with some loss of readability |
| cons.config.dtb = control_dtb |
| cons.restart_uboot() |
| with cons.log.section('Kernel load'): |
| output = cons.run_command_list(cmd.splitlines()) |
| check_equal(kernel, kernel_out, 'Kernel not loaded') |
| check_not_equal(control_dtb, fdt_out, |
| 'FDT loaded but should be ignored') |
| check_not_equal(ramdisk, ramdisk_out, |
| 'Ramdisk loaded but should not be') |
| |
| # Find out the offset in the FIT where U-Boot has found the FDT |
| line = find_matching(output, 'Booting using the fdt blob at ') |
| fit_offset = int(line, 16) - params['fit_addr'] |
| fdt_magic = struct.pack('>L', 0xd00dfeed) |
| data = read_file(fit) |
| |
| # Now find where it actually is in the FIT (skip the first word) |
| real_fit_offset = data.find(fdt_magic, 4) |
| assert fit_offset == real_fit_offset, ( |
| 'U-Boot loaded FDT from offset %#x, FDT is actually at %#x' % |
| (fit_offset, real_fit_offset)) |
| |
| # Now a kernel and an FDT |
| with cons.log.section('Kernel + FDT load'): |
| params['fdt_load'] = 'load = <%#x>;' % params['fdt_addr'] |
| fit = make_fit(mkimage, params) |
| cons.restart_uboot() |
| output = cons.run_command_list(cmd.splitlines()) |
| check_equal(kernel, kernel_out, 'Kernel not loaded') |
| check_equal(control_dtb, fdt_out, 'FDT not loaded') |
| check_not_equal(ramdisk, ramdisk_out, |
| 'Ramdisk loaded but should not be') |
| |
| # Try a ramdisk |
| with cons.log.section('Kernel + FDT + Ramdisk load'): |
| params['ramdisk_config'] = 'ramdisk = "ramdisk@1";' |
| params['ramdisk_load'] = 'load = <%#x>;' % params['ramdisk_addr'] |
| fit = make_fit(mkimage, params) |
| cons.restart_uboot() |
| output = cons.run_command_list(cmd.splitlines()) |
| check_equal(ramdisk, ramdisk_out, 'Ramdisk not loaded') |
| |
| # Configuration with some Loadables |
| with cons.log.section('Kernel + FDT + Ramdisk load + Loadables'): |
| params['loadables_config'] = 'loadables = "kernel@2", "ramdisk@2";' |
| params['loadables1_load'] = ('load = <%#x>;' % |
| params['loadables1_addr']) |
| params['loadables2_load'] = ('load = <%#x>;' % |
| params['loadables2_addr']) |
| fit = make_fit(mkimage, params) |
| cons.restart_uboot() |
| output = cons.run_command_list(cmd.splitlines()) |
| check_equal(loadables1, loadables1_out, |
| 'Loadables1 (kernel) not loaded') |
| check_equal(loadables2, loadables2_out, |
| 'Loadables2 (ramdisk) not loaded') |
| |
| cons = u_boot_console |
| try: |
| # We need to use our own device tree file. Remember to restore it |
| # afterwards. |
| old_dtb = cons.config.dtb |
| mkimage = cons.config.build_dir + '/tools/mkimage' |
| run_fit_test(mkimage) |
| finally: |
| # Go back to the original U-Boot with the correct dtb. |
| cons.config.dtb = old_dtb |
| cons.restart_uboot() |
