linux-kernel - Re: [PATCH] syscalls: fix sys_fanotify

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Date: Sat, 29 Jun 2024 23:31:51 +0200
From: Helge Deller <deller@....de>
To: Arnd Bergmann <arnd@...nel.org>, Arnd Bergmann <arnd@...db.de>
Cc: Guenter Roeck <linux@...ck-us.net>, linux-api@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-parisc <linux-parisc@...r.kernel.org>
Subject: Re: [PATCH] syscalls: fix sys_fanotify_mark prototype

On 6/29/24 23:03, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> My earlier fix missed an incorrect function prototype that shows up on
> native 32-bit builds:
>
> In file included from fs/notify/fanotify/fanotify_user.c:14:
> include/linux/syscalls.h:248:25: error: conflicting types for 'sys_fanotify_mark'; have 'long int(int,  unsigned int,  u32,  u32,  int,  const char *)' {aka 'long int(int,  unsigned int,  unsigned int,  unsigned int,  int,  const char *)'}
>   1924 | SYSCALL32_DEFINE6(fanotify_mark,
>        | ^~~~~~~~~~~~~~~~~
> include/linux/syscalls.h:862:17: note: previous declaration of 'sys_fanotify_mark' with type 'long int(int,  unsigned int,  u64,  int, const char *)' {aka 'long int(int,  unsigned int,  long long unsigned int,  int,  const char *)'}
>
> On x86 and powerpc, the prototype is also wrong but hidden in an #ifdef,
> so it never caused problems.
>
> Add another alternative declaration that matches the conditional function
> definition.
>
> Fixes: 403f17a33073 ("parisc: use generic sys_fanotify_mark implementation")
> Reported-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Guenter, thanks for noticing!

Arnd, I can confirm this patch fixes the 32-bit build for hppa,
so you may add:
Tested-by: Helge Deller <deller@....de>

Thank you!
Helge


> ---
> I've queued this fix in the asm-generic tree now
>
>   include/linux/syscalls.h | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index 63424af87bba..fff820c3e93e 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -859,9 +859,15 @@ asmlinkage long sys_prlimit64(pid_t pid, unsigned int resource,
>   				const struct rlimit64 __user *new_rlim,
>   				struct rlimit64 __user *old_rlim);
>   asmlinkage long sys_fanotify_init(unsigned int flags, unsigned int event_f_flags);
> +#if defined(CONFIG_ARCH_SPLIT_ARG64)
> +asmlinkage long sys_fanotify_mark(int fanotify_fd, unsigned int flags,
> +                                unsigned int mask_1, unsigned int mask_2,
> +				int dfd, const char  __user * pathname);
> +#else
>   asmlinkage long sys_fanotify_mark(int fanotify_fd, unsigned int flags,
>   				  u64 mask, int fd,
>   				  const char  __user *pathname);
> +#endif
>   asmlinkage long sys_name_to_handle_at(int dfd, const char __user *name,
>   				      struct file_handle __user *handle,
>   				      int __user *mnt_id, int flag);