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![]() Jiri Olsa says: ==================== Martynas reported bpf_get_func_ip returning +4 address when CONFIG_X86_KERNEL_IBT option is enabled and I found there are some failing bpf tests when this option is enabled. The CONFIG_X86_KERNEL_IBT option adds endbr instruction at the function entry, so the idea is to 'fix' entry ip for kprobe_multi and trampoline probes, because they are placed on the function entry. v5 changes: - updated uapi/linux/bpf.h headers with comment for bpf_get_func_ip returning 0 [Andrii] - added acks v4 changes: - used get_kernel_nofault to read previous instruction [Peter] - used movabs instruction in trampoline comment [Peter] - renamed fentry_ip argument in kprobe_multi_link_handler [Peter] v3 changes: - using 'unused' bpf function to get IBT config option into selftest skeleton - rebased to current bpf-next/master - added ack/review from Masami v2 changes: - change kprobes get_func_ip to return zero for kprobes attached within the function body [Andrii] - detect IBT config and properly test kprobe with offset [Andrii] v1 changes: - read previous instruction in kprobe_multi link handler and adjust entry_ip for CONFIG_X86_KERNEL_IBT option - split first patch into 2 separate changes - update changelogs ==================== Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Alexei Starovoitov <ast@kernel.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.