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pidfs: handle FS_IOC32_GETVERSION in compat ioctl

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FS_IOC32_GETVERSION has a distinct compat command encoding. Passing it
through compat_ptr_ioctl() leaves pidfd_ioctl() unable to recognize the
otherwise architecture-independent inode generation query.

Translate the compat command to FS_IOC_GETVERSION before dispatching it
through the native pidfd ioctl implementation.

Signed-off-by: Li Chen <me@linux.beauty>
Link: https://patch.msgid.link/20260716052822.1034228-1-me@linux.beauty
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Li Chen 2026-07-16 13:28:20 +08:00 committed by Christian Brauner
parent a1e0eb8f55
commit 1d0cff74d8
1 changed files with 15 additions and 1 deletions
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16
fs/pidfs.c
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@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/anon_inodes.h>
#include <linux/compat.h>
#include <linux/exportfs.h>
#include <linux/file.h>
#include <linux/fs.h>
@ -659,6 +660,17 @@ static long pidfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return open_namespace(ns_common);
}
#ifdef CONFIG_COMPAT
static long pidfd_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
if (cmd == FS_IOC32_GETVERSION)
cmd = FS_IOC_GETVERSION;
return pidfd_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
}
#endif
static int pidfs_file_release(struct inode *inode, struct file *file)
{
struct pid *pid = inode->i_private;
@ -686,7 +698,9 @@ static const struct file_operations pidfs_file_operations = {
.show_fdinfo = pidfd_show_fdinfo,
#endif
.unlocked_ioctl = pidfd_ioctl,
.compat_ioctl = compat_ptr_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = pidfd_compat_ioctl,
#endif
};
struct pid *pidfd_pid(const struct file *file)