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s390/seccomp: add support for system call filtering using BPF

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Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2012-07-31 15:37:13 +02:00 committed by Martin Schwidefsky
parent e206d3da58
commit c63cb468f3
3 changed files with 17 additions and 1 deletions
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1
arch/s390/Kconfig
View file

@ -124,6 +124,7 @@ config S390
select GENERIC_TIME_VSYSCALL
select GENERIC_CLOCKEVENTS
select KTIME_SCALAR if 32BIT
select HAVE_ARCH_SECCOMP_FILTER
config SCHED_OMIT_FRAME_POINTER
def_bool y

10
arch/s390/include/asm/syscall.h
View file

@ -12,6 +12,7 @@
#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H 1
#include <linux/audit.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <asm/ptrace.h>
@ -87,4 +88,13 @@ static inline void syscall_set_arguments(struct task_struct *task,
regs->orig_gpr2 = args[0];
}
static inline int syscall_get_arch(struct task_struct *task,
struct pt_regs *regs)
{
#ifdef CONFIG_COMPAT
if (test_tsk_thread_flag(task, TIF_31BIT))
return AUDIT_ARCH_S390;
#endif
return sizeof(long) == 8 ? AUDIT_ARCH_S390X : AUDIT_ARCH_S390;
}
#endif /* _ASM_SYSCALL_H */

7
arch/s390/kernel/ptrace.c
View file

@ -719,7 +719,11 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
long ret = 0;
/* Do the secure computing check first. */
secure_computing_strict(regs->gprs[2]);
if (secure_computing(regs->gprs[2])) {
/* seccomp failures shouldn't expose any additional code. */
ret = -1;
goto out;
}
/*
* The sysc_tracesys code in entry.S stored the system
@ -745,6 +749,7 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
regs->gprs[2], regs->orig_gpr2,
regs->gprs[3], regs->gprs[4],
regs->gprs[5]);
out:
return ret ?: regs->gprs[2];
}