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73c4936f91
Add a test case to trigger the constant scalar issue which leaves the register in scalar(imm=0,umin=0,umax=1,var_off=(0x0; 0x0)) state. Make use of dead code elimination, so that we can see the verifier bailing out on unfixed kernels. For the condition, we use jle given it checks on umax bound. Before: # ./test_verifier 743 #743/p jump & dead code elimination FAIL Failed to load prog 'Permission denied'! R4 !read_ok verification time 11 usec stack depth 0 processed 13 insns (limit 1000000) max_states_per_insn 0 total_states 1 peak_states 1 mark_read 1 Summary: 0 PASSED, 0 SKIPPED, 1 FAILED After: # ./test_verifier 743 #743/p jump & dead code elimination OK Summary: 1 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220701124727.11153-3-daniel@iogearbox.net
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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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.