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Sabyrzhan Tasbolatov 1db272864f x86/traps: move kmsan check after instrumentation_begin 
During x86_64 kernel build with CONFIG_KMSAN, the objtool warns following:

  AR      built-in.a
  AR      vmlinux.a
  LD      vmlinux.o
vmlinux.o: warning: objtool: handle_bug+0x4: call to
    kmsan_unpoison_entry_regs() leaves .noinstr.text section
  OBJCOPY modules.builtin.modinfo
  GEN     modules.builtin
  MODPOST Module.symvers
  CC      .vmlinux.export.o

Moving kmsan_unpoison_entry_regs() _after_ instrumentation_begin() fixes
the warning.

There is decode_bug(regs->ip, &imm) is left before KMSAN unpoisoining, but
it has the return condition and if we include it after
instrumentation_begin() it results the warning "return with
instrumentation enabled", hence, I'm concerned that regs will not be KMSAN
unpoisoned if `ud_type == BUG_NONE` is true.

Link: https://lkml.kernel.org/r/20241016152407.3149001-1-snovitoll@gmail.com
Fixes: ba54d194f8 ("x86/traps: avoid KMSAN bugs originating from handle_bug()")
Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-10-28 21:40:39 -07:00
arch x86/traps: move kmsan check after instrumentation_begin 2024-10-28 21:40:39 -07:00
block block-6.12-20241026 2024-10-27 08:29:36 -10:00
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Documentation Power management fixes for 6.12-rc5 2024-10-25 11:00:50 -07:00
drivers platform-drivers-x86 for v6.12-3 2024-10-27 08:40:33 -10:00
fs fork: do not invoke uffd on fork if error occurs 2024-10-28 21:40:38 -07:00
include fork: only invoke khugepaged, ksm hooks if no error 2024-10-28 21:40:39 -07:00
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kernel fork: only invoke khugepaged, ksm hooks if no error 2024-10-28 21:40:39 -07:00
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Makefile Linux 6.12-rc5 2024-10-27 12:52:02 -10:00
README

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 reStructuredText 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.