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e8763fb66a
Add both positive and negative tests cases using string kfuncs added in
the previous patches.
Positive tests check that the functions work as expected.
Negative tests pass various incorrect strings to the kfuncs and check
for the expected error codes:
-E2BIG when passing too long strings
-EFAULT when trying to read inaccessible kernel memory
-ERANGE when passing userspace pointers on arches with non-overlapping
address spaces
A majority of the tests use the RUN_TESTS helper which executes BPF
programs with BPF_PROG_TEST_RUN and check for the expected return value.
An exception to this are tests for long strings as we need to memset the
long string from userspace (at least I haven't found an ergonomic way to
memset it from a BPF program), which cannot be done using the RUN_TESTS
infrastructure.
Suggested-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Viktor Malik <vmalik@redhat.com>
Link: https://lore.kernel.org/r/090451a2e60c9ae1dceb4d1bfafa3479db5c7481.1750917800.git.vmalik@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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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
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There are various text files in the Documentation/ subdirectory,
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the problems which may result by upgrading your kernel.