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authorEric W. Biederman <ebiederm@xmission.com>2009-04-03 03:36:27 -0400
committerEric W. Biederman <ebiederm@xmission.com>2009-11-06 06:52:55 -0500
commitda3f6f9b3e0d1e73975ca81ae124406bf1587d40 (patch)
treeab2e5bb6366b0bdc00ec1bc5c02e610c1c77195d /arch/powerpc/kernel/sys_ppc32.c
parent2830b68361a9f58354ad043c6d85043ea917f907 (diff)
sysctl: Introduce a generic compat sysctl sysctl
This uses compat_alloc_userspace to remove the various hacks to allow do_sysctl to write to throuh oldlenp. The rest of our mature compat syscall helper facitilies are used as well to ensure we have a nice clean maintainable compat syscall that can be used on all architectures. The motiviation for a generic compat sysctl (besides the obvious hack removal) is to reduce the number of compat sysctl defintions out there so I can refactor the binary sysctl implementation. ppc already used the name compat_sys_sysctl so I remove the ppcs version here. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'arch/powerpc/kernel/sys_ppc32.c')
-rw-r--r--arch/powerpc/kernel/sys_ppc32.c52
1 files changed, 0 insertions, 52 deletions
diff --git a/arch/powerpc/kernel/sys_ppc32.c b/arch/powerpc/kernel/sys_ppc32.c
index b97c2d67f4ac..c5a4732bcc48 100644
--- a/arch/powerpc/kernel/sys_ppc32.c
+++ b/arch/powerpc/kernel/sys_ppc32.c
@@ -520,58 +520,6 @@ asmlinkage long compat_sys_umask(u32 mask)
520 return sys_umask((int)mask); 520 return sys_umask((int)mask);
521} 521}
522 522
523#ifdef CONFIG_SYSCTL_SYSCALL
524struct __sysctl_args32 {
525 u32 name;
526 int nlen;
527 u32 oldval;
528 u32 oldlenp;
529 u32 newval;
530 u32 newlen;
531 u32 __unused[4];
532};
533
534asmlinkage long compat_sys_sysctl(struct __sysctl_args32 __user *args)
535{
536 struct __sysctl_args32 tmp;
537 int error;
538 size_t oldlen;
539 size_t __user *oldlenp = NULL;
540 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
541
542 if (copy_from_user(&tmp, args, sizeof(tmp)))
543 return -EFAULT;
544
545 if (tmp.oldval && tmp.oldlenp) {
546 /* Duh, this is ugly and might not work if sysctl_args
547 is in read-only memory, but do_sysctl does indirectly
548 a lot of uaccess in both directions and we'd have to
549 basically copy the whole sysctl.c here, and
550 glibc's __sysctl uses rw memory for the structure
551 anyway. */
552 oldlenp = (size_t __user *)addr;
553 if (get_user(oldlen, (compat_size_t __user *)compat_ptr(tmp.oldlenp)) ||
554 put_user(oldlen, oldlenp))
555 return -EFAULT;
556 }
557
558 lock_kernel();
559 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen,
560 compat_ptr(tmp.oldval), oldlenp,
561 compat_ptr(tmp.newval), tmp.newlen);
562 unlock_kernel();
563 if (oldlenp) {
564 if (!error) {
565 if (get_user(oldlen, oldlenp) ||
566 put_user(oldlen, (compat_size_t __user *)compat_ptr(tmp.oldlenp)))
567 error = -EFAULT;
568 }
569 copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
570 }
571 return error;
572}
573#endif
574
575unsigned long compat_sys_mmap2(unsigned long addr, size_t len, 523unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
576 unsigned long prot, unsigned long flags, 524 unsigned long prot, unsigned long flags,
577 unsigned long fd, unsigned long pgoff) 525 unsigned long fd, unsigned long pgoff)