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ubsan: Avoid i386 UBSAN handler crashes with Clang
When generating Runtime Calls, Clang doesn't respect the -mregparm=3 option used on i386. Hopefully this will be fixed correctly in Clang 19: llvm/llvm-project#89707 but we need to fix this for earlier Clang versions today. Force the calling convention to use non-register arguments. Reported-by: Erhard Furtner <erhard_f@mailbox.org> Closes: KSPP#350 Link: https://lore.kernel.org/r/20240424224026.it.216-kees@kernel.org Signed-off-by: Kees Cook <keescook@chromium.org>
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