diff options
| author | chs <chs@NetBSD.org> | 2003-08-24 17:52:28 +0000 |
|---|---|---|
| committer | chs <chs@NetBSD.org> | 2003-08-24 17:52:28 +0000 |
| commit | 939df36e552ea9012b7b0d0d15080f894ebaaaff (patch) | |
| tree | 2c4be187b10b4d03eedeccd43a6ba2359fa195e0 /sys/compat/linux/common | |
| parent | 4b28d28d7028d98186f61c78a41660eb73edde00 (diff) | |
add support for non-executable mappings (where the hardware allows this)
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.
Diffstat (limited to 'sys/compat/linux/common')
| -rw-r--r-- | sys/compat/linux/common/linux_exec.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sys/compat/linux/common/linux_exec.c b/sys/compat/linux/common/linux_exec.c index b61cb0f0b0e..8525d570fb3 100644 --- a/sys/compat/linux/common/linux_exec.c +++ b/sys/compat/linux/common/linux_exec.c @@ -1,4 +1,4 @@ -/* $NetBSD: linux_exec.c,v 1.64 2003/06/29 22:29:26 fvdl Exp $ */ +/* $NetBSD: linux_exec.c,v 1.65 2003/08/24 17:52:43 chs Exp $ */ /*- * Copyright (c) 1994, 1995, 1998, 2000 The NetBSD Foundation, Inc. @@ -38,7 +38,7 @@ */ #include <sys/cdefs.h> -__KERNEL_RCSID(0, "$NetBSD: linux_exec.c,v 1.64 2003/06/29 22:29:26 fvdl Exp $"); +__KERNEL_RCSID(0, "$NetBSD: linux_exec.c,v 1.65 2003/08/24 17:52:43 chs Exp $"); #include <sys/param.h> #include <sys/systm.h> @@ -111,6 +111,9 @@ linux_sys_execve(l, v, retval) /* * Emulation switch. */ + +struct uvm_object *emul_linux_object; + const struct emul emul_linux = { "linux", "/emul/linux", @@ -126,6 +129,7 @@ const struct emul emul_linux = { linux_trapsignal, linux_sigcode, linux_esigcode, + &emul_linux_object, linux_setregs, linux_e_proc_exec, linux_e_proc_fork, |
