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Fangrui Song
4d6ffa27b8
Commit393f203f5f("x86_64: kasan: add interceptors for memset/memmove/memcpy functions") added .weak directives to arch/x86/lib/mem*_64.S instead of changing the existing ENTRY macros to WEAK. This can lead to the assembly snippet .weak memcpy ... .globl memcpy which will produce a STB_WEAK memcpy with GNU as but STB_GLOBAL memcpy with LLVM's integrated assembler before LLVM 12. LLVM 12 (since https://reviews.llvm.org/D90108) will error on such an overridden symbol binding. Commitef1e03152c("x86/asm: Make some functions local") changed ENTRY in arch/x86/lib/memcpy_64.S to SYM_FUNC_START_LOCAL, which was ineffective due to the preceding .weak directive. Use the appropriate SYM_FUNC_START_WEAK instead. Fixes:393f203f5f("x86_64: kasan: add interceptors for memset/memmove/memcpy functions") Fixes:ef1e03152c("x86/asm: Make some functions local") Reported-by: Sami Tolvanen <[email protected]> Signed-off-by: Fangrui Song <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Reviewed-by: Nick Desaulniers <[email protected]> Tested-by: Nathan Chancellor <[email protected]> Tested-by: Nick Desaulniers <[email protected]> Cc: <[email protected]> Link: https://lkml.kernel.org/r/[email protected]
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.