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Import `__darwin_check_fd_set_overflow` from Apple open-source
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src/kernel/libsyscall/wrappers/_libc_funcptr.c
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src/kernel/libsyscall/wrappers/_libc_funcptr.c
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}
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}
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__attribute__((visibility("hidden")))
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int
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pthread_current_stack_contains_np(const void *addr, size_t len)
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{
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if (_libkernel_functions->version >= 4 &&
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_libkernel_functions->pthread_current_stack_contains_np) {
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return _libkernel_functions->pthread_current_stack_contains_np(addr, len);
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}
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return 0;
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}
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/*
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* Upcalls to optimized libplatform string functions
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*/
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src/kernel/libsyscall/wrappers/_libkernel_init.h
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src/kernel/libsyscall/wrappers/_libkernel_init.h
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/* The following functions are included in version 3 of this structure */
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void (*pthread_clear_qos_tsd)(mach_port_t);
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/* The following functions are included in version 4 of this structure */
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int (*pthread_current_stack_contains_np)(const void *, size_t);
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/* Subsequent versions must only add pointers! */
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void (*dyld_func_lookup)(const char*,void**);
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} *_libkernel_functions_t;
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src/kernel/libsyscall/wrappers/terminate_with_reason.c
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src/kernel/libsyscall/wrappers/terminate_with_reason.c
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#include <sys/types.h>
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#include <stdint.h>
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#include <signal.h>
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#include <os/reason_private.h>
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#include <unistd.h>
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/* Crash simulation */
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extern int pthread_current_stack_contains_np(const void *, unsigned long);
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int
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__darwin_check_fd_set_overflow(int n, const void *fd_set, int unlimited_select)
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{
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if (n < 0) {
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os_fault_with_payload(OS_REASON_LIBSYSTEM, OS_REASON_LIBSYSTEM_CODE_FAULT,
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&n, sizeof(n), "FD_SET underflow", 0);
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return 0;
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}
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if (n >= __DARWIN_FD_SETSIZE) {
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if (pthread_current_stack_contains_np((const void *) fd_set, sizeof(struct fd_set))) {
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if (!unlimited_select) {
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os_fault_with_payload(OS_REASON_LIBSYSTEM, OS_REASON_LIBSYSTEM_CODE_FAULT,
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&n, sizeof(n), "FD_SET overflow", 0);
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return 0;
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} else {
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return 1;
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}
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} else {
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return 1;
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}
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}
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return 1;
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}
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/* System call entry points */
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int __terminate_with_payload(int pid, uint32_t reason_namespace, uint64_t reason_code,
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src/libsystem/init.c
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src/libsystem/init.c
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// V2 functions (removed)
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// V3 functions
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.pthread_clear_qos_tsd = _pthread_clear_qos_tsd,
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// V4 functions
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.pthread_current_stack_contains_np = pthread_current_stack_contains_np,
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#ifdef DARLING
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.dyld_func_lookup = _dyld_func_lookup,
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#endif