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Handle `KAUTH_{U,G}ID_NONE` and mode -1 in fchmod_extended
These are actually accepted and allowed by Darwin.
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src/kernel/emulation/linux/unistd/fchmod_extended.c
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src/kernel/emulation/linux/unistd/fchmod_extended.c
···
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#include "../errno.h"
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#include <linux-syscalls/linux.h>
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#include <sys/types.h>
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#include <sys/kauth.h>
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long sys_fchmod_extended(int fd, int uid, int gid, int mode, void* xsec)
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{
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int ret;
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// apparently, these are supposed to go through successfully
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if (uid == KAUTH_UID_NONE || gid == KAUTH_GID_NONE || mode == -1) {
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return 0;
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}
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ret = LINUX_SYSCALL2(__NR_fchmod, fd, mode);
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if (ret < 0)