[PATCH v3 2/2] PCI: Implement custom llseek for sysfs resource entries

From: Valentine Sinitsyn
Date: Tue Aug 22 2023 - 03:51:34 EST


Since commit 636b21b50152 ("PCI: Revoke mappings like devmem"), mmappable
sysfs entries have started to receive their f_mapping from the iomem
pseudo filesystem, so that CONFIG_IO_STRICT_DEVMEM is honored in sysfs
(and procfs) as well as in /dev/[k]mem.

This resulted in a userspace-visible regression:

1. Open a sysfs PCI resource file (eg. /sys/bus/pci/devices/*/resource0)
2. Use lseek(fd, 0, SEEK_END) to determine its size

Expected result: a PCI region size is returned.
Actual result: 0 is returned.

The reason is that PCI resource files residing in sysfs use
generic_file_llseek(), which relies on f_mapping->host inode to get the
file size. As f_mapping is now redefined, f_mapping->host points to an
anonymous zero-sized iomem_inode which has nothing to do with sysfs file
in question.

Implement a custom llseek method for sysfs PCI resources, which is
almost the same as proc_bus_pci_lseek() used for procfs entries.

This makes sysfs and procfs entries consistent with regards to seeking,
but also introduces userspace-visible changes to seeking PCI resources
in sysfs:

- SEEK_DATA and SEEK_HOLE are no longer supported;
- Seeking past the end of the file is prohibited while previously
offsets up to MAX_NON_LFS were accepted (reading from these offsets
was always invalid).

Fixes: 636b21b50152 ("PCI: Revoke mappings like devmem")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Valentine Sinitsyn <valesini@xxxxxxxxxxxxxx>
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
---
drivers/pci/pci-sysfs.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index ab32a91f287b..42eaeb8d4a4f 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -967,6 +967,8 @@ void pci_create_legacy_files(struct pci_bus *b)
b->legacy_io->attr.mode = 0600;
b->legacy_io->read = pci_read_legacy_io;
b->legacy_io->write = pci_write_legacy_io;
+ /* See pci_create_attr() for motivation */
+ b->legacy_io->llseek = pci_llseek_resource;
b->legacy_io->mmap = pci_mmap_legacy_io;
b->legacy_io->f_mapping = iomem_get_mapping;
pci_adjust_legacy_attr(b, pci_mmap_io);
@@ -981,6 +983,8 @@ void pci_create_legacy_files(struct pci_bus *b)
b->legacy_mem->size = 1024*1024;
b->legacy_mem->attr.mode = 0600;
b->legacy_mem->mmap = pci_mmap_legacy_mem;
+ /* See pci_create_attr() for motivation */
+ b->legacy_io->llseek = pci_llseek_resource;
b->legacy_mem->f_mapping = iomem_get_mapping;
pci_adjust_legacy_attr(b, pci_mmap_mem);
error = device_create_bin_file(&b->dev, b->legacy_mem);
@@ -1138,6 +1142,14 @@ static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
return pci_resource_io(filp, kobj, attr, buf, off, count, true);
}

+static loff_t pci_llseek_resource(struct file *filep,
+ struct kobject *kobj __always_unused,
+ struct bin_attribute *attr,
+ loff_t offset, int whence)
+{
+ return fixed_size_llseek(filep, offset, whence, attr->size);
+}
+
/**
* pci_remove_resource_files - cleanup resource files
* @pdev: dev to cleanup
@@ -1195,8 +1207,15 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
res_attr->mmap = pci_mmap_resource_uc;
}
}
- if (res_attr->mmap)
+ if (res_attr->mmap) {
res_attr->f_mapping = iomem_get_mapping;
+ /*
+ * generic_file_llseek() consults f_mapping->host to determine
+ * the file size. As iomem_inode knows nothing about the
+ * attribute, it's not going to work, so override it as well.
+ */
+ res_attr->llseek = pci_llseek_resource;
+ }
res_attr->attr.name = res_attr_name;
res_attr->attr.mode = 0600;
res_attr->size = pci_resource_len(pdev, num);

prerequisite-patch-id: 955ac8520d17a30dc71166fa7f1d25c09cbab46e
--
2.34.1