939df36e55
and make the stack and heap non-executable by default. the changes fall into two basic catagories: - pmap and trap-handler changes. these are all MD: = alpha: we already track per-page execute permission with the (software) PG_EXEC bit, so just have the trap handler pay attention to it. = i386: use a new GDT segment for %cs for processes that have no executable mappings above a certain threshold (currently the bottom of the stack). track per-page execute permission with the last unused PTE bit. = powerpc/ibm4xx: just use the hardware exec bit. = powerpc/oea: we already track per-page exec bits, but the hardware only implements non-exec mappings at the segment level. so track the number of executable mappings in each segment and turn on the no-exec segment bit iff the count is 0. adjust the trap handler to deal. = sparc (sun4m): fix our use of the hardware protection bits. fix the trap handler to recognize text faults. = sparc64: split the existing unified TSB into data and instruction TSBs, and only load TTEs into the appropriate TSB(s) for the permissions. fix the trap handler to check for execute permission. = not yet implemented: amd64, hppa, sh5 - changes in all the emulations that put a signal trampoline on the stack. instead, we now put the trampoline into a uvm_aobj and map that into the process separately. originally from openbsd, adapted for netbsd by me. |
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|---|---|---|
| .. | ||
| files.irix | ||
| irix_dirent.c | ||
| irix_errno.c | ||
| irix_errno.h | ||
| irix_exec_elf32.c | ||
| irix_exec.c | ||
| irix_exec.h | ||
| irix_fcntl.c | ||
| irix_fcntl.h | ||
| irix_ioctl.c | ||
| irix_ioctl.h | ||
| irix_kmem.c | ||
| irix_kmem.h | ||
| irix_misc.c | ||
| irix_mman.c | ||
| irix_mman.h | ||
| irix_mount.c | ||
| irix_prctl.c | ||
| irix_prctl.h | ||
| irix_resource.c | ||
| irix_resource.h | ||
| irix_signal.c | ||
| irix_signal.h | ||
| irix_stat.c | ||
| irix_swap.c | ||
| irix_swap.h | ||
| irix_syscall.h | ||
| irix_syscallargs.h | ||
| irix_syscalls.c | ||
| irix_sysctl.c | ||
| irix_sysctl.h | ||
| irix_sysent.c | ||
| irix_sysmp.c | ||
| irix_sysmp.h | ||
| irix_syssgi.c | ||
| irix_syssgi.h | ||
| irix_systeminfo.c | ||
| irix_types.h | ||
| irix_usema.c | ||
| irix_usema.h | ||
| Makefile | ||
| syscalls.conf | ||
| syscalls.master | ||