50ceaa95ea
Adds test for stack initialization coverage. We have several build options that control the level of stack variable initialization. This test lets us visualize which options cover which cases, and provide tests for some of the pathological padding conditions the compiler will sometimes fail to initialize. All options pass the explicit initialization cases and the partial initializers (even with padding): test_stackinit: u8_zero ok test_stackinit: u16_zero ok test_stackinit: u32_zero ok test_stackinit: u64_zero ok test_stackinit: char_array_zero ok test_stackinit: small_hole_zero ok test_stackinit: big_hole_zero ok test_stackinit: trailing_hole_zero ok test_stackinit: packed_zero ok test_stackinit: small_hole_dynamic_partial ok test_stackinit: big_hole_dynamic_partial ok test_stackinit: trailing_hole_dynamic_partial ok test_stackinit: packed_dynamic_partial ok test_stackinit: small_hole_static_partial ok test_stackinit: big_hole_static_partial ok test_stackinit: trailing_hole_static_partial ok test_stackinit: packed_static_partial ok test_stackinit: packed_static_all ok test_stackinit: packed_dynamic_all ok test_stackinit: packed_runtime_all ok The results of the other tests (which contain no explicit initialization), change based on the build's configured compiler instrumentation. No options: test_stackinit: small_hole_static_all FAIL (uninit bytes: 3) test_stackinit: big_hole_static_all FAIL (uninit bytes: 61) test_stackinit: trailing_hole_static_all FAIL (uninit bytes: 7) test_stackinit: small_hole_dynamic_all FAIL (uninit bytes: 3) test_stackinit: big_hole_dynamic_all FAIL (uninit bytes: 61) test_stackinit: trailing_hole_dynamic_all FAIL (uninit bytes: 7) test_stackinit: small_hole_runtime_partial FAIL (uninit bytes: 23) test_stackinit: big_hole_runtime_partial FAIL (uninit bytes: 127) test_stackinit: trailing_hole_runtime_partial FAIL (uninit bytes: 24) test_stackinit: packed_runtime_partial FAIL (uninit bytes: 24) test_stackinit: small_hole_runtime_all FAIL (uninit bytes: 3) test_stackinit: big_hole_runtime_all FAIL (uninit bytes: 61) test_stackinit: trailing_hole_runtime_all FAIL (uninit bytes: 7) test_stackinit: u8_none FAIL (uninit bytes: 1) test_stackinit: u16_none FAIL (uninit bytes: 2) test_stackinit: u32_none FAIL (uninit bytes: 4) test_stackinit: u64_none FAIL (uninit bytes: 8) test_stackinit: char_array_none FAIL (uninit bytes: 16) test_stackinit: switch_1_none FAIL (uninit bytes: 8) test_stackinit: switch_2_none FAIL (uninit bytes: 8) test_stackinit: small_hole_none FAIL (uninit bytes: 24) test_stackinit: big_hole_none FAIL (uninit bytes: 128) test_stackinit: trailing_hole_none FAIL (uninit bytes: 32) test_stackinit: packed_none FAIL (uninit bytes: 32) test_stackinit: user FAIL (uninit bytes: 32) test_stackinit: failures: 25 CONFIG_GCC_PLUGIN_STRUCTLEAK_USER=y This only tries to initialize structs with __user markings, so only the difference from above is now the "user" test passes: test_stackinit: small_hole_static_all FAIL (uninit bytes: 3) test_stackinit: big_hole_static_all FAIL (uninit bytes: 61) test_stackinit: trailing_hole_static_all FAIL (uninit bytes: 7) test_stackinit: small_hole_dynamic_all FAIL (uninit bytes: 3) test_stackinit: big_hole_dynamic_all FAIL (uninit bytes: 61) test_stackinit: trailing_hole_dynamic_all FAIL (uninit bytes: 7) test_stackinit: small_hole_runtime_partial FAIL (uninit bytes: 23) test_stackinit: big_hole_runtime_partial FAIL (uninit bytes: 127) test_stackinit: trailing_hole_runtime_partial FAIL (uninit bytes: 24) test_stackinit: packed_runtime_partial FAIL (uninit bytes: 24) test_stackinit: small_hole_runtime_all FAIL (uninit bytes: 3) test_stackinit: big_hole_runtime_all FAIL (uninit bytes: 61) test_stackinit: trailing_hole_runtime_all FAIL (uninit bytes: 7) test_stackinit: u8_none FAIL (uninit bytes: 1) test_stackinit: u16_none FAIL (uninit bytes: 2) test_stackinit: u32_none FAIL (uninit bytes: 4) test_stackinit: u64_none FAIL (uninit bytes: 8) test_stackinit: char_array_none FAIL (uninit bytes: 16) test_stackinit: switch_1_none FAIL (uninit bytes: 8) test_stackinit: switch_2_none FAIL (uninit bytes: 8) test_stackinit: small_hole_none FAIL (uninit bytes: 24) test_stackinit: big_hole_none FAIL (uninit bytes: 128) test_stackinit: trailing_hole_none FAIL (uninit bytes: 32) test_stackinit: packed_none FAIL (uninit bytes: 32) test_stackinit: user ok test_stackinit: failures: 24 CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF=y This initializes all structures passed by reference (scalars and strings remain uninitialized): test_stackinit: small_hole_static_all ok test_stackinit: big_hole_static_all ok test_stackinit: trailing_hole_static_all ok test_stackinit: small_hole_dynamic_all ok test_stackinit: big_hole_dynamic_all ok test_stackinit: trailing_hole_dynamic_all ok test_stackinit: small_hole_runtime_partial ok test_stackinit: big_hole_runtime_partial ok test_stackinit: trailing_hole_runtime_partial ok test_stackinit: packed_runtime_partial ok test_stackinit: small_hole_runtime_all ok test_stackinit: big_hole_runtime_all ok test_stackinit: trailing_hole_runtime_all ok test_stackinit: u8_none FAIL (uninit bytes: 1) test_stackinit: u16_none FAIL (uninit bytes: 2) test_stackinit: u32_none FAIL (uninit bytes: 4) test_stackinit: u64_none FAIL (uninit bytes: 8) test_stackinit: char_array_none FAIL (uninit bytes: 16) test_stackinit: switch_1_none FAIL (uninit bytes: 8) test_stackinit: switch_2_none FAIL (uninit bytes: 8) test_stackinit: small_hole_none ok test_stackinit: big_hole_none ok test_stackinit: trailing_hole_none ok test_stackinit: packed_none ok test_stackinit: user ok test_stackinit: failures: 7 CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL=y This initializes all variables, so it matches above with the scalars and arrays included: test_stackinit: small_hole_static_all ok test_stackinit: big_hole_static_all ok test_stackinit: trailing_hole_static_all ok test_stackinit: small_hole_dynamic_all ok test_stackinit: big_hole_dynamic_all ok test_stackinit: trailing_hole_dynamic_all ok test_stackinit: small_hole_runtime_partial ok test_stackinit: big_hole_runtime_partial ok test_stackinit: trailing_hole_runtime_partial ok test_stackinit: packed_runtime_partial ok test_stackinit: small_hole_runtime_all ok test_stackinit: big_hole_runtime_all ok test_stackinit: trailing_hole_runtime_all ok test_stackinit: u8_none ok test_stackinit: u16_none ok test_stackinit: u32_none ok test_stackinit: u64_none ok test_stackinit: char_array_none ok test_stackinit: switch_1_none ok test_stackinit: switch_2_none ok test_stackinit: small_hole_none ok test_stackinit: big_hole_none ok test_stackinit: trailing_hole_none ok test_stackinit: packed_none ok test_stackinit: user ok test_stackinit: all tests passed! Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> |
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README
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.