There are three kinds of SEGV, which is an error that results from an invalid memory access:
- A page was accessed which had the wrong permissions. E.g., it was read-only but your code tried to write to it. This will be reported as
- A page was accessed that is not even mapped into the address space of the application at all. This will often result from dereferencing a null pointer or a pointer that was corrupted with a small integer value. This is reported as
- A new SEGV error code
SEGV_BNDERRis introduced in new kernel.
可以参考 Linux kernel 源代码中的
/* * SIGSEGV si_codes */ #define SEGV_MAPERR (__SI_FAULT|1) /* address not mapped to object */ #define SEGV_ACCERR (__SI_FAULT|2) /* invalid permissions for mapped object */ #define SEGV_BNDERR (__SI_FAULT|3) /* failed address bound checks */ #define NSIGSEGV 3