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Sami Tolvanen
4f0f586bf0
list_sort() internally casts the comparison function passed to it to a different type with constant struct list_head pointers, and uses this pointer to call the functions, which trips indirect call Control-Flow Integrity (CFI) checking. Instead of removing the consts, this change defines the list_cmp_func_t type and changes the comparison function types of all list_sort() callers to use const pointers, thus avoiding type mismatches. Suggested-by: Nick Desaulniers <[email protected]> Signed-off-by: Sami Tolvanen <[email protected]> Reviewed-by: Nick Desaulniers <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Reviewed-by: Kees Cook <[email protected]> Tested-by: Nick Desaulniers <[email protected]> Tested-by: Nathan Chancellor <[email protected]> Signed-off-by: Kees Cook <[email protected]> Link: https://lore.kernel.org/r/[email protected]