On Tue, 21 Apr 2020 17:41:59 +0200 Christoph Hellwig <hch@xxxxxx> wrote: > To remove the use of set_fs in the coredump code there needs to be a > way to convert a kernel siginfo to a userspace compat siginfo. > > Call that function copy_siginfo_to_compat and factor it out of > copy_siginfo_to_user32. > > The existence of x32 complicates this code. On x32 SIGCHLD uses 64bit > times for utime and stime. As only SIGCHLD is affected and SIGCHLD > never causes a coredump I have avoided handling that case. x86_64 allmodconfig: kernel/signal.c: In function 'copy_siginfo_to_external32': kernel/signal.c:3299:7: error: 'x32_ABI' undeclared (first use in this function); did you mean 'CTL_ABI'? if (x32_ABI) { ^~~~~~~ I looked at fixing it but surely this sort of thing: int copy_siginfo_to_user32(struct compat_siginfo __user *to, const struct kernel_siginfo *from) #if defined(CONFIG_X86_X32_ABI) || defined(CONFIG_IA32_EMULATION) { return __copy_siginfo_to_user32(to, from, in_x32_syscall()); } int __copy_siginfo_to_user32(struct compat_siginfo __user *to, const struct kernel_siginfo *from, bool x32_ABI) #endif { ... is too ugly to live?