91a27b2a75
getname() is intended to copy pathname strings from userspace into a kernel buffer. The result is just a string in kernel space. It would however be quite helpful to be able to attach some ancillary info to the string. For instance, we could attach some audit-related info to reduce the amount of audit-related processing needed. When auditing is enabled, we could also call getname() on the string more than once and not need to recopy it from userspace. This patchset converts the getname()/putname() interfaces to return a struct instead of a string. For now, the struct just tracks the string in kernel space and the original userland pointer for it. Later, we'll add other information to the struct as it becomes convenient. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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* linux/arch/unicore32/kernel/sys.c
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/ipc.h>
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#include <linux/uaccess.h>
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#include <asm/syscalls.h>
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#include <asm/cacheflush.h>
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/* Clone a task - this clones the calling program thread.
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* This is called indirectly via a small wrapper
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*/
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asmlinkage long __sys_clone(unsigned long clone_flags, unsigned long newsp,
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void __user *parent_tid, void __user *child_tid,
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struct pt_regs *regs)
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{
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if (!newsp)
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newsp = regs->UCreg_sp;
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return do_fork(clone_flags, newsp, regs, 0,
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parent_tid, child_tid);
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}
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/* sys_execve() executes a new program.
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* This is called indirectly via a small wrapper
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*/
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asmlinkage long __sys_execve(const char __user *filename,
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const char __user *const __user *argv,
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const char __user *const __user *envp,
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struct pt_regs *regs)
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{
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int error;
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struct filename *fn;
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fn = getname(filename);
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error = PTR_ERR(fn);
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if (IS_ERR(fn))
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goto out;
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error = do_execve(fn->name, argv, envp, regs);
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putname(fn);
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out:
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return error;
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}
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int kernel_execve(const char *filename,
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const char *const argv[],
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const char *const envp[])
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{
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struct pt_regs regs;
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int ret;
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memset(®s, 0, sizeof(struct pt_regs));
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ret = do_execve(filename,
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(const char __user *const __user *)argv,
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(const char __user *const __user *)envp, ®s);
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if (ret < 0)
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goto out;
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/*
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* Save argc to the register structure for userspace.
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*/
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regs.UCreg_00 = ret;
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/*
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* We were successful. We won't be returning to our caller, but
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* instead to user space by manipulating the kernel stack.
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*/
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asm("add r0, %0, %1\n\t"
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"mov r1, %2\n\t"
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"mov r2, %3\n\t"
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"mov r22, #0\n\t" /* not a syscall */
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"mov r23, %0\n\t" /* thread structure */
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"b.l memmove\n\t" /* copy regs to top of stack */
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"mov sp, r0\n\t" /* reposition stack pointer */
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"b ret_to_user"
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:
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: "r" (current_thread_info()),
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"Ir" (THREAD_START_SP - sizeof(regs)),
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"r" (®s),
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"Ir" (sizeof(regs))
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: "r0", "r1", "r2", "r3", "ip", "lr", "memory");
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out:
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return ret;
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}
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/* Note: used by the compat code even in 64-bit Linux. */
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SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
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unsigned long, prot, unsigned long, flags,
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unsigned long, fd, unsigned long, off_4k)
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{
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return sys_mmap_pgoff(addr, len, prot, flags, fd,
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off_4k);
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}
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/* Provide the actual syscall number to call mapping. */
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#undef __SYSCALL
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#define __SYSCALL(nr, call) [nr] = (call),
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/* Note that we don't include <linux/unistd.h> but <asm/unistd.h> */
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void *sys_call_table[__NR_syscalls] = {
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[0 ... __NR_syscalls-1] = sys_ni_syscall,
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#include <asm/unistd.h>
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};
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