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49 lines
1.7 KiB
Diff
49 lines
1.7 KiB
Diff
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From ac1bb283d250c7c48171c91c9e8542285f1f97e2 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Mon, 22 May 2023 14:22:55 +0100
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Subject: [PATCH 0472/1085] pps: Compatibility hack should be X86-specific
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As of [1], using PPS_FETCH on a 64-bit ARM kernel with a 32-bit userland
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is broken, returning a timeout. This is because the requested 4-byte
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alignment for struct pps_ktime_compat (illegal on arm64) results in the
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timeout flags field being uninitialised.
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Make the hack specific to X86_64 builds with CONFIG_COMPAT defined.
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[1] commit c2a49fe8eeef ("pps: fix padding issue with PPS_FETCH for
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ioctl_compat")
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See: https://github.com/raspberrypi/linux/issues/5430
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Fixes: c2a49fe8eeef ("pps: fix padding issue with PPS_FETCH for ioctl_compat")
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/pps/pps.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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--- a/drivers/pps/pps.c
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+++ b/drivers/pps/pps.c
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@@ -249,12 +249,13 @@ static long pps_cdev_ioctl(struct file *
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static long pps_cdev_compat_ioctl(struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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- struct pps_device *pps = file->private_data;
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- void __user *uarg = (void __user *) arg;
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cmd = _IOC(_IOC_DIR(cmd), _IOC_TYPE(cmd), _IOC_NR(cmd), sizeof(void *));
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+#ifdef CONFIG_X86_64
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if (cmd == PPS_FETCH) {
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+ struct pps_device *pps = file->private_data;
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+ void __user *uarg = (void __user *) arg;
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struct pps_fdata_compat compat;
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struct pps_fdata fdata;
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int err;
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@@ -289,6 +290,7 @@ static long pps_cdev_compat_ioctl(struct
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return copy_to_user(uarg, &compat,
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sizeof(struct pps_fdata_compat)) ? -EFAULT : 0;
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}
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+#endif
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return pps_cdev_ioctl(file, cmd, arg);
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}
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