diff options
Diffstat (limited to 'arch/sparc/kernel/sys_sparc.c')
-rw-r--r-- | arch/sparc/kernel/sys_sparc.c | 49 |
1 files changed, 27 insertions, 22 deletions
diff --git a/arch/sparc/kernel/sys_sparc.c b/arch/sparc/kernel/sys_sparc.c index 0cdfc9d294b4..896863fb208a 100644 --- a/arch/sparc/kernel/sys_sparc.c +++ b/arch/sparc/kernel/sys_sparc.c @@ -219,6 +219,21 @@ out: return err; } +int sparc_mmap_check(unsigned long addr, unsigned long len, unsigned long flags) +{ + if (ARCH_SUN4C_SUN4 && + (len > 0x20000000 || + ((flags & MAP_FIXED) && + addr < 0xe0000000 && addr + len > 0x20000000))) + return -EINVAL; + + /* See asm-sparc/uaccess.h */ + if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) + return -EINVAL; + + return 0; +} + /* Linux version of mmap */ static unsigned long do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, @@ -233,25 +248,13 @@ static unsigned long do_mmap2(unsigned long addr, unsigned long len, goto out; } - retval = -EINVAL; len = PAGE_ALIGN(len); - if (ARCH_SUN4C_SUN4 && - (len > 0x20000000 || - ((flags & MAP_FIXED) && - addr < 0xe0000000 && addr + len > 0x20000000))) - goto out_putf; - - /* See asm-sparc/uaccess.h */ - if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) - goto out_putf; - flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); down_write(¤t->mm->mmap_sem); retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); up_write(¤t->mm->mmap_sem); -out_putf: if (file) fput(file); out: @@ -465,21 +468,23 @@ sys_rt_sigaction(int sig, asmlinkage int sys_getdomainname(char __user *name, int len) { - int nlen; - int err = -EFAULT; + int nlen, err; + if (len < 0) + return -EINVAL; + down_read(&uts_sem); nlen = strlen(system_utsname.domainname) + 1; + err = -EINVAL; + if (nlen > len) + goto out; + + err = -EFAULT; + if (!copy_to_user(name, system_utsname.domainname, nlen)) + err = 0; - if (nlen < len) - len = nlen; - if (len > __NEW_UTS_LEN) - goto done; - if (copy_to_user(name, system_utsname.domainname, len)) - goto done; - err = 0; -done: +out: up_read(&uts_sem); return err; } |