Re: [PATCH v1 2/4] clone3: switch to copy_struct_from_user()
Hi Aleksa, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [cannot apply to v5.3 next-20190924] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Aleksa-Sarai/lib-introduce-copy_struct_from_user-helper/20190926-010527 config: parisc-b180_defconfig (attached as .config) compiler: hppa-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=parisc If you fix the issue, kindly add following tag Reported-by: kbuild test robot All errors (new ones prefixed by >>): lib/struct_user.o: In function `copy_struct_from_user': >> (.text+0x84): undefined reference to `is_zeroed_user' --- 0-DAY kernel test infrastructureOpen Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation .config.gz Description: application/gzip
Re: [PATCH v1 2/4] clone3: switch to copy_struct_from_user()
Hi Aleksa, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [cannot apply to v5.3 next-20190924] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Aleksa-Sarai/lib-introduce-copy_struct_from_user-helper/20190926-010527 config: xtensa-common_defconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=xtensa If you fix the issue, kindly add following tag Reported-by: kbuild test robot All errors (new ones prefixed by >>): >> lib/struct_user.o:(.text+0x8): undefined reference to `is_zeroed_user' lib/struct_user.o: In function `copy_struct_from_user': struct_user.c:(.text+0x37): undefined reference to `is_zeroed_user' --- 0-DAY kernel test infrastructureOpen Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation .config.gz Description: application/gzip
Re: [PATCH v1 2/4] clone3: switch to copy_struct_from_user()
On Wed, Sep 25, 2019 at 06:59:13PM +0200, Aleksa Sarai wrote:
> The change is very straightforward, and helps unify the syscall
> interface for struct-from-userspace syscalls. Additionally, explicitly
> define CLONE_ARGS_SIZE_VER0 to match the other users of the
> struct-extension pattern.
>
> Signed-off-by: Aleksa Sarai
> ---
> include/uapi/linux/sched.h | 2 ++
> kernel/fork.c | 34 +++---
> 2 files changed, 9 insertions(+), 27 deletions(-)
>
> diff --git a/include/uapi/linux/sched.h b/include/uapi/linux/sched.h
> index b3105ac1381a..0945805982b4 100644
> --- a/include/uapi/linux/sched.h
> +++ b/include/uapi/linux/sched.h
> @@ -47,6 +47,8 @@ struct clone_args {
> __aligned_u64 tls;
> };
>
> +#define CLONE_ARGS_SIZE_VER0 64 /* sizeof first published struct */
> +
> /*
> * Scheduling policies
> */
> diff --git a/kernel/fork.c b/kernel/fork.c
> index 541fd805fb88..a86e3841ee4e 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -2530,39 +2530,19 @@ SYSCALL_DEFINE5(clone, unsigned long, clone_flags,
> unsigned long, newsp,
> #ifdef __ARCH_WANT_SYS_CLONE3
> noinline static int copy_clone_args_from_user(struct kernel_clone_args
> *kargs,
> struct clone_args __user *uargs,
> - size_t size)
> + size_t usize)
> {
> + int err;
> struct clone_args args;
>
> - if (unlikely(size > PAGE_SIZE))
> + if (unlikely(usize > PAGE_SIZE))
> return -E2BIG;
> -
> - if (unlikely(size < sizeof(struct clone_args)))
> + if (unlikely(usize < CLONE_ARGS_SIZE_VER0))
> return -EINVAL;
You might want to rebase this patchset after the merge window closes on
rc1 since that code has changed right before the 5.3 release. But if you
can't don't worry I can also fix it up.
Christian
[PATCH v1 2/4] clone3: switch to copy_struct_from_user()
The change is very straightforward, and helps unify the syscall
interface for struct-from-userspace syscalls. Additionally, explicitly
define CLONE_ARGS_SIZE_VER0 to match the other users of the
struct-extension pattern.
Signed-off-by: Aleksa Sarai
---
include/uapi/linux/sched.h | 2 ++
kernel/fork.c | 34 +++---
2 files changed, 9 insertions(+), 27 deletions(-)
diff --git a/include/uapi/linux/sched.h b/include/uapi/linux/sched.h
index b3105ac1381a..0945805982b4 100644
--- a/include/uapi/linux/sched.h
+++ b/include/uapi/linux/sched.h
@@ -47,6 +47,8 @@ struct clone_args {
__aligned_u64 tls;
};
+#define CLONE_ARGS_SIZE_VER0 64 /* sizeof first published struct */
+
/*
* Scheduling policies
*/
diff --git a/kernel/fork.c b/kernel/fork.c
index 541fd805fb88..a86e3841ee4e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2530,39 +2530,19 @@ SYSCALL_DEFINE5(clone, unsigned long, clone_flags,
unsigned long, newsp,
#ifdef __ARCH_WANT_SYS_CLONE3
noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs,
struct clone_args __user *uargs,
- size_t size)
+ size_t usize)
{
+ int err;
struct clone_args args;
- if (unlikely(size > PAGE_SIZE))
+ if (unlikely(usize > PAGE_SIZE))
return -E2BIG;
-
- if (unlikely(size < sizeof(struct clone_args)))
+ if (unlikely(usize < CLONE_ARGS_SIZE_VER0))
return -EINVAL;
- if (unlikely(!access_ok(uargs, size)))
- return -EFAULT;
-
- if (size > sizeof(struct clone_args)) {
- unsigned char __user *addr;
- unsigned char __user *end;
- unsigned char val;
-
- addr = (void __user *)uargs + sizeof(struct clone_args);
- end = (void __user *)uargs + size;
-
- for (; addr < end; addr++) {
- if (get_user(val, addr))
- return -EFAULT;
- if (val)
- return -E2BIG;
- }
-
- size = sizeof(struct clone_args);
- }
-
- if (copy_from_user(, uargs, size))
- return -EFAULT;
+ err = copy_struct_from_user(, sizeof(args), uargs, usize);
+ if (err)
+ return err;
/*
* Verify that higher 32bits of exit_signal are unset and that
--
2.23.0
