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51814683e2
The compat handler for ioctls to the virtual nci device is missing. So,
nci-specific ioctls of a compat task return with -1 and errno set to
ENOTTY. Add a handler.
The handling of an ioctl() call of a compat task to get the index of
virtual nci device (IOCTL_GET_NCIDEV_IDX) lands in the default case of
the ioctl compat handler (see fs/ioctl.c):
COMPAT_SYSCALL_DEFINE3(ioctl, ...)
{
...
default:
error = do_vfs_ioctl(fd_file(f), fd, cmd, ...);
if (error != -ENOIOCTLCMD)
break;
if (fd_file(f)->f_op->compat_ioctl)
error = fd_file(f)->f_op->compat_ioctl(fd_file(f), cmd, arg);
if (error == -ENOIOCTLCMD)
error = -ENOTTY;
...
}
There, do_vfs_ioctl() returns -ENOIOCTLCMD and compat_ioctl is not
set for virtual_ncidev_fops, i.e. f_op->compat_ioctl == NULL. So, the
ioctl() syscall returns with -1 and errno set to ENOTTY to the compat
task.
To fix this, use the compat_ptr_ioctl helper for compat handling here.
It shall be used for ioctls that "either ignore the argument or pass a
pointer to a compatible data type". The driver's sole ioctl takes a user
void pointer and copies nfc_dev->idx to it, a 4-byte integer across all
ABIs.
This issue has been found by running the nci_dev kernel selftest as
rv64 binary on top of a CHERI kernel, where the ioctl() ends up in
the ioctl compat handler, similar to a 32-bit application on top of a
64-bit kernel.
Fixes:
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|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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