Messages in this thread | | | From | Miklos Szeredi <> | Date | Wed, 24 Apr 2019 16:27:43 +0200 | Subject | Re: [PATCH] fuse: Add ioctl flag for x32 compat ioctl |
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On Wed, Apr 24, 2019 at 4:14 PM Ian Abbott <abbotti@mev.co.uk> wrote: > > Currently, a CUSE server running on a 64-bit kernel can tell when an > ioctl request comes from a process running a 32-bit ABI, but cannot tell > whether the requesting process is using legacy IA32 emulation or x32 > ABI. In particular, the server does not know the size of the client > process's `time_t` type. > > For 64-bit kernels, the `FUSE_IOCTL_COMPAT` and `FUSE_IOCTL_32BIT` flags > are currently set in the ioctl input request (`struct fuse_ioctl_in` > member `flags`) for a 32-bit requesting process. This patch defines a > new flag `FUSE_IOCTL_COMPAT_X32` and sets it if the 32-bit requesting > process is using the x32 ABI. This allows the server process to > distinguish between requests from requesting client processes using IA32 > emulation or the x32 ABI and so infer the size of the client process's > `time_t` type and any other IA32/x32 differences.
Thanks, applied.
Miklos
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