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>
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
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* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2007-2009 PetaLogix
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* Copyright (C) 2007 John Williams <john.williams@petalogix.com>
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*
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* Copyright (C) 2006 Atmark Techno, Inc.
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* Yasushi SHOJI <yashi@atmark-techno.com>
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* Tetsuya OHKAWA <tetsuya@atmark-techno.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/syscalls.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/mman.h>
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#include <linux/sys.h>
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#include <linux/ipc.h>
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#include <linux/file.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/fs.h>
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#include <linux/semaphore.h>
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#include <linux/uaccess.h>
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#include <linux/unistd.h>
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#include <linux/slab.h>
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#include <asm/syscalls.h>
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asmlinkage long microblaze_vfork(struct pt_regs *regs)
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{
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return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->r1,
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regs, 0, NULL, NULL);
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}
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asmlinkage long microblaze_clone(int flags, unsigned long stack,
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struct pt_regs *regs)
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{
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if (!stack)
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stack = regs->r1;
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return do_fork(flags, stack, regs, 0, NULL, NULL);
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}
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asmlinkage long microblaze_execve(const char __user *filenamei,
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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 *filename;
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filename = getname(filenamei);
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error = PTR_ERR(filename);
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if (IS_ERR(filename))
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goto out;
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error = do_execve(filename->name, argv, envp, regs);
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putname(filename);
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out:
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return error;
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}
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asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, off_t pgoff)
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{
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if (pgoff & ~PAGE_MASK)
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return -EINVAL;
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return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT);
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}
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/*
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* Do a system call from kernel instead of calling sys_execve so we
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* end up with proper pt_regs.
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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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register const char *__a __asm__("r5") = filename;
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register const void *__b __asm__("r6") = argv;
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register const void *__c __asm__("r7") = envp;
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register unsigned long __syscall __asm__("r12") = __NR_execve;
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register unsigned long __ret __asm__("r3");
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__asm__ __volatile__ ("brki r14, 0x8"
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: "=r" (__ret), "=r" (__syscall)
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: "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
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: "r4", "r8", "r9",
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"r10", "r11", "r14", "cc", "memory");
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return __ret;
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}
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