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[SPARC64]: Add SECCOMP support.

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Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2005-07-10 16:49:28 -07:00
parent af166d15c3
commit bb49bcda15
5 changed files with 30 additions and 15 deletions
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17
arch/sparc64/Kconfig
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@ -43,6 +43,23 @@ config SPARC64_PAGE_SIZE_4MB
endchoice
config SECCOMP
bool "Enable seccomp to safely compute untrusted bytecode"
depends on PROC_FS
default y
help
This kernel feature is useful for number crunching applications
that may need to compute untrusted bytecode during their
execution. By using pipes or other transports made available to
the process as file descriptors supporting the read/write
syscalls, it's possible to isolate those applications in
their own address space using seccomp. Once seccomp is
enabled via /proc/<pid>/seccomp, it cannot be disabled
and the task is only allowed to execute a few safe syscalls
defined by each seccomp mode.
If unsure, say Y. Only embedded should say N here.
source kernel/Kconfig.hz
source "init/Kconfig"

10
arch/sparc64/kernel/entry.S
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@ -1552,7 +1552,7 @@ sys_ptrace: add %sp, PTREGS_OFF, %o0
nop
.align 32
1: ldx [%curptr + TI_FLAGS], %l5
andcc %l5, _TIF_SYSCALL_TRACE, %g0
andcc %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP), %g0
be,pt %icc, rtrap
clr %l6
call syscall_trace
@ -1676,7 +1676,7 @@ linux_sparc_syscall32:
srl %i5, 0, %o5 ! IEU1
srl %i2, 0, %o2 ! IEU0 Group
andcc %l0, _TIF_SYSCALL_TRACE, %g0 ! IEU0 Group
andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP), %g0 ! IEU0 Group
bne,pn %icc, linux_syscall_trace32 ! CTI
mov %i0, %l5 ! IEU1
call %l7 ! CTI Group brk forced
@ -1699,7 +1699,7 @@ linux_sparc_syscall:
mov %i3, %o3 ! IEU1
mov %i4, %o4 ! IEU0 Group
andcc %l0, _TIF_SYSCALL_TRACE, %g0 ! IEU1 Group+1 bubble
andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP), %g0 ! IEU1 Group+1 bubble
bne,pn %icc, linux_syscall_trace ! CTI Group
mov %i0, %l5 ! IEU0
2: call %l7 ! CTI Group brk forced
@ -1727,7 +1727,7 @@ ret_sys_call:
1:
cmp %o0, -ERESTART_RESTARTBLOCK
bgeu,pn %xcc, 1f
andcc %l0, _TIF_SYSCALL_TRACE, %l6
andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP), %l6
80:
/* System call success, clear Carry condition code. */
andn %g3, %g2, %g3
@ -1742,7 +1742,7 @@ ret_sys_call:
/* System call failure, set Carry condition code.
* Also, get abs(errno) to return to the process.
*/
andcc %l0, _TIF_SYSCALL_TRACE, %l6
andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP), %l6
sub %g0, %o0, %o0
or %g3, %g2, %g3
stx %o0, [%sp + PTREGS_OFF + PT_V9_I0]

3
arch/sparc64/kernel/power.c
View File

@ -4,6 +4,8 @@
* Copyright (C) 1999 David S. Miller (davem@redhat.com)
*/
#define __KERNEL_SYSCALLS__
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
@ -17,7 +19,6 @@
#include <asm/ebus.h>
#include <asm/auxio.h>
#define __KERNEL_SYSCALLS__
#include <linux/unistd.h>
/*

12
arch/sparc64/kernel/ptrace.c
View File

@ -630,9 +630,9 @@ asmlinkage void do_ptrace(struct pt_regs *regs)
asmlinkage void syscall_trace(void)
{
#ifdef DEBUG_PTRACE
printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
#endif
/* do the secure computing check first */
secure_computing(current_thread_info()->kregs->u_regs[UREG_G1]);
if (!test_thread_flag(TIF_SYSCALL_TRACE))
return;
if (!(current->ptrace & PT_PTRACED))
@ -645,12 +645,8 @@ asmlinkage void syscall_trace(void)
* for normal use. strace only continues with a signal if the
* stopping signal is not SIGTRAP. -brl
*/
#ifdef DEBUG_PTRACE
printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
current->pid, current->exit_code);
#endif
if (current->exit_code) {
send_sig (current->exit_code, current, 1);
send_sig(current->exit_code, current, 1);
current->exit_code = 0;
}
}

3
include/asm-sparc64/thread_info.h
View File

@ -220,7 +220,7 @@ register struct thread_info *current_thread_info_reg asm("g6");
#define TIF_NEWSIGNALS 6 /* wants new-style signals */
#define TIF_32BIT 7 /* 32-bit binary */
#define TIF_NEWCHILD 8 /* just-spawned child process */
/* TIF_* value 9 is available */
#define TIF_SECCOMP 9 /* secure computing */
#define TIF_POLLING_NRFLAG 10
#define TIF_SYSCALL_SUCCESS 11
/* NOTE: Thread flags >= 12 should be ones we have no interest
@ -239,6 +239,7 @@ register struct thread_info *current_thread_info_reg asm("g6");
#define _TIF_NEWSIGNALS (1<<TIF_NEWSIGNALS)
#define _TIF_32BIT (1<<TIF_32BIT)
#define _TIF_NEWCHILD (1<<TIF_NEWCHILD)
#define _TIF_SECCOMP (1<<TIF_SECCOMP)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
#define _TIF_SYSCALL_SUCCESS (1<<TIF_SYSCALL_SUCCESS)