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[SPARC64]: Add SECCOMP support.
Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -43,6 +43,23 @@ config SPARC64_PAGE_SIZE_4MB
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endchoice
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config SECCOMP
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bool "Enable seccomp to safely compute untrusted bytecode"
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depends on PROC_FS
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default y
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help
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This kernel feature is useful for number crunching applications
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that may need to compute untrusted bytecode during their
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execution. By using pipes or other transports made available to
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the process as file descriptors supporting the read/write
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syscalls, it's possible to isolate those applications in
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their own address space using seccomp. Once seccomp is
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enabled via /proc/<pid>/seccomp, it cannot be disabled
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and the task is only allowed to execute a few safe syscalls
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defined by each seccomp mode.
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If unsure, say Y. Only embedded should say N here.
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source kernel/Kconfig.hz
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source "init/Kconfig"
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@ -1552,7 +1552,7 @@ sys_ptrace: add %sp, PTREGS_OFF, %o0
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nop
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.align 32
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1: ldx [%curptr + TI_FLAGS], %l5
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andcc %l5, _TIF_SYSCALL_TRACE, %g0
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andcc %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP), %g0
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be,pt %icc, rtrap
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clr %l6
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call syscall_trace
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@ -1676,7 +1676,7 @@ linux_sparc_syscall32:
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srl %i5, 0, %o5 ! IEU1
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srl %i2, 0, %o2 ! IEU0 Group
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andcc %l0, _TIF_SYSCALL_TRACE, %g0 ! IEU0 Group
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andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP), %g0 ! IEU0 Group
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bne,pn %icc, linux_syscall_trace32 ! CTI
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mov %i0, %l5 ! IEU1
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call %l7 ! CTI Group brk forced
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@ -1699,7 +1699,7 @@ linux_sparc_syscall:
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mov %i3, %o3 ! IEU1
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mov %i4, %o4 ! IEU0 Group
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andcc %l0, _TIF_SYSCALL_TRACE, %g0 ! IEU1 Group+1 bubble
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andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP), %g0 ! IEU1 Group+1 bubble
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bne,pn %icc, linux_syscall_trace ! CTI Group
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mov %i0, %l5 ! IEU0
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2: call %l7 ! CTI Group brk forced
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@ -1727,7 +1727,7 @@ ret_sys_call:
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1:
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cmp %o0, -ERESTART_RESTARTBLOCK
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bgeu,pn %xcc, 1f
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andcc %l0, _TIF_SYSCALL_TRACE, %l6
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andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP), %l6
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80:
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/* System call success, clear Carry condition code. */
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andn %g3, %g2, %g3
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@ -1742,7 +1742,7 @@ ret_sys_call:
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/* System call failure, set Carry condition code.
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* Also, get abs(errno) to return to the process.
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*/
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andcc %l0, _TIF_SYSCALL_TRACE, %l6
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andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP), %l6
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sub %g0, %o0, %o0
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or %g3, %g2, %g3
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stx %o0, [%sp + PTREGS_OFF + PT_V9_I0]
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@ -4,6 +4,8 @@
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* Copyright (C) 1999 David S. Miller (davem@redhat.com)
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*/
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#define __KERNEL_SYSCALLS__
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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@ -17,7 +19,6 @@
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#include <asm/ebus.h>
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#include <asm/auxio.h>
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#define __KERNEL_SYSCALLS__
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#include <linux/unistd.h>
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/*
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@ -630,9 +630,9 @@ out:
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asmlinkage void syscall_trace(void)
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{
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#ifdef DEBUG_PTRACE
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printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
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#endif
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/* do the secure computing check first */
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secure_computing(current_thread_info()->kregs->u_regs[UREG_G1]);
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if (!test_thread_flag(TIF_SYSCALL_TRACE))
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return;
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if (!(current->ptrace & PT_PTRACED))
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@ -645,12 +645,8 @@ asmlinkage void syscall_trace(void)
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* for normal use. strace only continues with a signal if the
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* stopping signal is not SIGTRAP. -brl
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*/
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#ifdef DEBUG_PTRACE
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printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
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current->pid, current->exit_code);
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#endif
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if (current->exit_code) {
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send_sig (current->exit_code, current, 1);
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send_sig(current->exit_code, current, 1);
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current->exit_code = 0;
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}
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}
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@ -220,7 +220,7 @@ register struct thread_info *current_thread_info_reg asm("g6");
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#define TIF_NEWSIGNALS 6 /* wants new-style signals */
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#define TIF_32BIT 7 /* 32-bit binary */
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#define TIF_NEWCHILD 8 /* just-spawned child process */
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/* TIF_* value 9 is available */
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#define TIF_SECCOMP 9 /* secure computing */
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#define TIF_POLLING_NRFLAG 10
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#define TIF_SYSCALL_SUCCESS 11
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/* NOTE: Thread flags >= 12 should be ones we have no interest
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@ -239,6 +239,7 @@ register struct thread_info *current_thread_info_reg asm("g6");
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#define _TIF_NEWSIGNALS (1<<TIF_NEWSIGNALS)
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#define _TIF_32BIT (1<<TIF_32BIT)
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#define _TIF_NEWCHILD (1<<TIF_NEWCHILD)
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#define _TIF_SECCOMP (1<<TIF_SECCOMP)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
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#define _TIF_SYSCALL_SUCCESS (1<<TIF_SYSCALL_SUCCESS)
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