From: "Laszlo Ersek" <lersek@redhat.com>
To: devel@edk2.groups.io, virtio-fs@redhat.com, lersek@redhat.com
Cc: "Ard Biesheuvel" <ard.biesheuvel@arm.com>,
"Jordan Justen" <jordan.l.justen@intel.com>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>
Subject: [edk2 PATCH 43/48] OvmfPkg/VirtioFsDxe: handle file rename/move in EFI_FILE_PROTOCOL.SetInfo
Date: Wed, 16 Dec 2020 22:11:20 +0100 [thread overview]
Message-ID: <20201216211125.19496-44-lersek@redhat.com> (raw)
In-Reply-To: <20201216211125.19496-1-lersek@redhat.com>
Using the functions introduced previously, we can now implement the rename
operation in VirtioFsSimpleFileSetInfo().
Attribute updates come later.
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---
OvmfPkg/VirtioFsDxe/SimpleFsSetInfo.c | 234 +++++++++++++++++++-
1 file changed, 233 insertions(+), 1 deletion(-)
diff --git a/OvmfPkg/VirtioFsDxe/SimpleFsSetInfo.c b/OvmfPkg/VirtioFsDxe/SimpleFsSetInfo.c
index 895b5c029a9e..55169dde78b7 100644
--- a/OvmfPkg/VirtioFsDxe/SimpleFsSetInfo.c
+++ b/OvmfPkg/VirtioFsDxe/SimpleFsSetInfo.c
@@ -5,16 +5,17 @@
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Guid/FileSystemInfo.h> // gEfiFileSystemInfoGuid
#include <Guid/FileSystemVolumeLabelInfo.h> // gEfiFileSystemVolumeLabelInfo...
#include <Library/BaseLib.h> // StrCmp()
#include <Library/BaseMemoryLib.h> // CompareGuid()
+#include <Library/MemoryAllocationLib.h> // FreePool()
#include "VirtioFsDxe.h"
/**
Validate a buffer that the EFI_FILE_PROTOCOL.SetInfo() caller passes in for a
particular InformationType GUID.
The structure to be validated is supposed to end with a variable-length,
@@ -122,16 +123,247 @@ ValidateInfoStructure (
NameField = (CHAR16 *)((UINT8 *)Buffer + NameFieldByteOffset);
if (NameField[NameFieldChar16s - 1] != L'\0') {
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
+/**
+ Rename a VIRTIO_FS_FILE as requested in EFI_FILE_INFO.FileName.
+
+ @param[in,out] VirtioFsFile The VIRTIO_FS_FILE to rename.
+
+ @param[in] NewFileName The new file name requested by
+ EFI_FILE_PROTOCOL.SetInfo().
+
+ @retval EFI_SUCCESS The canonical format destination path that is
+ determined from the input value of
+ VirtioFsFile->CanonicalPathname and from
+ NewFileName is identical to the input value of
+ VirtioFsFile->CanonicalPathname. This means that
+ EFI_FILE_INFO does not constitute a rename
+ request. VirtioFsFile has not been changed.
+
+ @retval EFI_SUCCESS VirtioFsFile has been renamed.
+ VirtioFsFile->CanonicalPathname has assumed the
+ destination pathname in canonical format.
+
+ @retval EFI_ACCESS_DENIED VirtioFsFile refers to the root directory, and
+ NewFileName expresses an actual rename/move
+ request.
+
+ @retval EFI_ACCESS_DENIED VirtioFsFile is the (possibly indirect) parent
+ directory of at least one other VIRTIO_FS_FILE
+ that is open for the same Virtio Filesystem
+ (identified by VirtioFsFile->OwnerFs). Renaming
+ VirtioFsFile would invalidate the canonical
+ pathnames of those VIRTIO_FS_FILE instances;
+ therefore the request has been rejected.
+
+ @retval EFI_ACCESS_DENIED VirtioFsFile is not open for writing, but
+ NewFileName expresses an actual rename/move
+ request.
+
+ @retval EFI_NOT_FOUND At least one dot-dot component in NewFileName
+ attempted to escape the root directory.
+
+ @return Error codes propagated from underlying functions.
+**/
+STATIC
+EFI_STATUS
+Rename (
+ IN OUT VIRTIO_FS_FILE *VirtioFsFile,
+ IN CHAR16 *NewFileName
+ )
+{
+
+ VIRTIO_FS *VirtioFs;
+ EFI_STATUS Status;
+ CHAR8 *Destination;
+ BOOLEAN RootEscape;
+ UINT64 OldParentDirNodeId;
+ CHAR8 *OldLastComponent;
+ UINT64 NewParentDirNodeId;
+ CHAR8 *NewLastComponent;
+
+ VirtioFs = VirtioFsFile->OwnerFs;
+
+ //
+ // The root directory cannot be renamed.
+ //
+ if (AsciiStrCmp (VirtioFsFile->CanonicalPathname, "/") == 0) {
+ if (StrCmp (NewFileName, L"") == 0) {
+ //
+ // Not a rename request anyway.
+ //
+ return EFI_SUCCESS;
+ }
+ return EFI_ACCESS_DENIED;
+ }
+
+ //
+ // Compose the canonical pathname for the destination.
+ //
+ Status = VirtioFsComposeRenameDestination (VirtioFsFile->CanonicalPathname,
+ NewFileName, &Destination, &RootEscape);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ if (RootEscape) {
+ Status = EFI_NOT_FOUND;
+ goto FreeDestination;
+ }
+ //
+ // If the rename would leave VirtioFsFile->CanonicalPathname unchanged, then
+ // EFI_FILE_PROTOCOL.SetInfo() isn't asking for a rename actually.
+ //
+ if (AsciiStrCmp (VirtioFsFile->CanonicalPathname, Destination) == 0) {
+ Status = EFI_SUCCESS;
+ goto FreeDestination;
+ }
+ //
+ // Check if the rename would break the canonical pathnames of other
+ // VIRTIO_FS_FILE instances of the same VIRTIO_FS.
+ //
+ if (VirtioFsFile->IsDirectory) {
+ UINTN PathLen;
+ LIST_ENTRY *OpenFilesEntry;
+
+ PathLen = AsciiStrLen (VirtioFsFile->CanonicalPathname);
+ BASE_LIST_FOR_EACH (OpenFilesEntry, &VirtioFs->OpenFiles) {
+ VIRTIO_FS_FILE *OtherFile;
+
+ OtherFile = VIRTIO_FS_FILE_FROM_OPEN_FILES_ENTRY (OpenFilesEntry);
+ if (OtherFile != VirtioFsFile &&
+ AsciiStrnCmp (VirtioFsFile->CanonicalPathname,
+ OtherFile->CanonicalPathname, PathLen) == 0 &&
+ (OtherFile->CanonicalPathname[PathLen] == '\0' ||
+ OtherFile->CanonicalPathname[PathLen] == '/')) {
+ //
+ // OtherFile refers to the same directory as VirtioFsFile, or is a
+ // (possibly indirect) child of the directory referred to by
+ // VirtioFsFile.
+ //
+ Status = EFI_ACCESS_DENIED;
+ goto FreeDestination;
+ }
+ }
+ }
+ //
+ // From this point on, the file needs to be open for writing.
+ //
+ if (!VirtioFsFile->IsOpenForWriting) {
+ Status = EFI_ACCESS_DENIED;
+ goto FreeDestination;
+ }
+ //
+ // Split both source and destination canonical pathnames into (most specific
+ // parent directory, last component) pairs.
+ //
+ Status = VirtioFsLookupMostSpecificParentDir (VirtioFs,
+ VirtioFsFile->CanonicalPathname, &OldParentDirNodeId,
+ &OldLastComponent);
+ if (EFI_ERROR (Status)) {
+ goto FreeDestination;
+ }
+ Status = VirtioFsLookupMostSpecificParentDir (VirtioFs, Destination,
+ &NewParentDirNodeId, &NewLastComponent);
+ if (EFI_ERROR (Status)) {
+ goto ForgetOldParentDirNodeId;
+ }
+ //
+ // Perform the rename. If the destination path exists, the rename will fail.
+ //
+ Status = VirtioFsFuseRename (VirtioFs, OldParentDirNodeId, OldLastComponent,
+ NewParentDirNodeId, NewLastComponent);
+ if (EFI_ERROR (Status)) {
+ goto ForgetNewParentDirNodeId;
+ }
+
+ //
+ // Swap in the new canonical pathname.
+ //
+ FreePool (VirtioFsFile->CanonicalPathname);
+ VirtioFsFile->CanonicalPathname = Destination;
+ Destination = NULL;
+ Status = EFI_SUCCESS;
+
+ //
+ // Fall through.
+ //
+ForgetNewParentDirNodeId:
+ if (NewParentDirNodeId != VIRTIO_FS_FUSE_ROOT_DIR_NODE_ID) {
+ VirtioFsFuseForget (VirtioFs, NewParentDirNodeId);
+ }
+
+ForgetOldParentDirNodeId:
+ if (OldParentDirNodeId != VIRTIO_FS_FUSE_ROOT_DIR_NODE_ID) {
+ VirtioFsFuseForget (VirtioFs, OldParentDirNodeId);
+ }
+
+FreeDestination:
+ if (Destination != NULL) {
+ FreePool (Destination);
+ }
+ return Status;
+}
+
+/**
+ Process an EFI_FILE_INFO setting request.
+**/
+STATIC
+EFI_STATUS
+SetFileInfo (
+ IN EFI_FILE_PROTOCOL *This,
+ IN UINTN BufferSize,
+ IN VOID *Buffer
+ )
+{
+ VIRTIO_FS_FILE *VirtioFsFile;
+ EFI_STATUS Status;
+ EFI_FILE_INFO *FileInfo;
+
+ VirtioFsFile = VIRTIO_FS_FILE_FROM_SIMPLE_FILE (This);
+
+ //
+ // Validate if Buffer passes as EFI_FILE_INFO.
+ //
+ Status = ValidateInfoStructure (
+ BufferSize, // SizeByProtocolCaller
+ OFFSET_OF (EFI_FILE_INFO,
+ FileName) + sizeof (CHAR16), // MinimumStructSize
+ TRUE, // IsSizeByInfoPresent
+ Buffer
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ FileInfo = Buffer;
+
+ //
+ // Perform the rename/move request, if any.
+ //
+ Status = Rename (VirtioFsFile, FileInfo->FileName);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ //
+ // Update any attributes requested.
+ //
+ Status = EFI_UNSUPPORTED;
+ //
+ // The UEFI spec does not speak about partial failure in
+ // EFI_FILE_PROTOCOL.SetInfo(); we won't try to roll back the rename (if
+ // there was one) in case the attribute updates fail.
+ //
+ return Status;
+}
+
/**
Process an EFI_FILE_SYSTEM_INFO setting request.
**/
STATIC
EFI_STATUS
SetFileSystemInfo (
IN EFI_FILE_PROTOCOL *This,
IN UINTN BufferSize,
@@ -225,17 +457,17 @@ EFIAPI
VirtioFsSimpleFileSetInfo (
IN EFI_FILE_PROTOCOL *This,
IN EFI_GUID *InformationType,
IN UINTN BufferSize,
IN VOID *Buffer
)
{
if (CompareGuid (InformationType, &gEfiFileInfoGuid)) {
- return EFI_UNSUPPORTED;
+ return SetFileInfo (This, BufferSize, Buffer);
}
if (CompareGuid (InformationType, &gEfiFileSystemInfoGuid)) {
return SetFileSystemInfo (This, BufferSize, Buffer);
}
if (CompareGuid (InformationType, &gEfiFileSystemVolumeLabelInfoIdGuid)) {
return SetFileSystemVolumeLabelInfo (This, BufferSize, Buffer);
--
2.19.1.3.g30247aa5d201
next prev parent reply other threads:[~2020-12-16 22:42 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-16 21:10 [edk2 PATCH 00/48] ArmVirtPkg, OvmfPkg: virtio filesystem driver Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 01/48] OvmfPkg: introduce VirtioFsDxe Laszlo Ersek
2020-12-18 17:42 ` Ard Biesheuvel
2020-12-18 18:13 ` [Virtio-fs] " Dr. David Alan Gilbert
2020-12-19 21:16 ` Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 02/48] ArmVirtPkg: include VirtioFsDxe in the ArmVirtQemu* platforms Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 03/48] OvmfPkg/VirtioFsDxe: DriverBinding: open VirtioDevice, install SimpleFs Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 04/48] OvmfPkg/VirtioFsDxe: implement virtio device (un)initialization Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 05/48] OvmfPkg/VirtioFsDxe: add a scatter-gather list data type Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 06/48] OvmfPkg/VirtioFsDxe: introduce the basic FUSE request/response headers Laszlo Ersek
2020-12-17 11:49 ` [Virtio-fs] " Dr. David Alan Gilbert
2020-12-17 13:57 ` Laszlo Ersek
2020-12-17 14:06 ` Dr. David Alan Gilbert
2020-12-17 14:32 ` Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 07/48] OvmfPkg/VirtioFsDxe: map "errno" values to EFI_STATUS Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 08/48] OvmfPkg/VirtioFsDxe: submit the FUSE_INIT request to the device Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 09/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_OPENDIR Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 10/48] OvmfPkg/VirtioFsDxe: add shared wrapper for FUSE_RELEASE / FUSE_RELEASEDIR Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 11/48] OvmfPkg/VirtioFsDxe: implement EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.OpenVolume() Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 12/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_FORGET Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 13/48] OvmfPkg/VirtioFsDxe: add a shared wrapper for FUSE_FSYNC / FUSE_FSYNCDIR Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 14/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_FLUSH Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 15/48] OvmfPkg/VirtioFsDxe: flush, sync, release and forget in Close() / Delete() Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 16/48] OvmfPkg/VirtioFsDxe: add helper for appending and sanitizing paths Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 17/48] OvmfPkg/VirtioFsDxe: manage path lifecycle in OpenVolume, Close, Delete Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 18/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_OPEN Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 19/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_MKDIR Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 20/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_CREATE Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 21/48] OvmfPkg/VirtioFsDxe: convert FUSE inode attributes to EFI_FILE_INFO Laszlo Ersek
2020-12-16 21:10 ` [edk2 PATCH 22/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_LOOKUP Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 23/48] OvmfPkg/VirtioFsDxe: split canon. path into last parent + last component Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 24/48] OvmfPkg/VirtioFsDxe: add a shared wrapper for FUSE_UNLINK / FUSE_RMDIR Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 25/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_GETATTR Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 26/48] OvmfPkg/VirtioFsDxe: implement EFI_FILE_PROTOCOL.Open() Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 27/48] OvmfPkg/VirtioFsDxe: erase the dir. entry in EFI_FILE_PROTOCOL.Delete() Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 28/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_STATFS Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 29/48] OvmfPkg/VirtioFsDxe: add helper for formatting UEFI basenames Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 30/48] OvmfPkg/VirtioFsDxe: implement EFI_FILE_PROTOCOL.GetInfo() Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 31/48] OvmfPkg/VirtioFsDxe: implement EFI_FILE_PROTOCOL.GetPosition, .SetPosition Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 32/48] OvmfPkg/VirtioFsDxe: add a shared wrapper for FUSE_READ / FUSE_READDIRPLUS Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 33/48] OvmfPkg/VirtioFsDxe: implement EFI_FILE_PROTOCOL.Read() for regular files Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 34/48] OvmfPkg/VirtioFsDxe: convert FUSE dirent filename to EFI_FILE_INFO Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 35/48] OvmfPkg/VirtioFsDxe: add EFI_FILE_INFO cache fields to VIRTIO_FS_FILE Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 36/48] OvmfPkg/VirtioFsDxe: implement EFI_FILE_PROTOCOL.Read() for directories Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 37/48] OvmfPkg/VirtioFsDxe: implement EFI_FILE_PROTOCOL.Flush() Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 38/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_WRITE Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 39/48] OvmfPkg/VirtioFsDxe: implement EFI_FILE_PROTOCOL.Write() Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 40/48] OvmfPkg/VirtioFsDxe: handle the volume label in EFI_FILE_PROTOCOL.SetInfo Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 41/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_RENAME2 Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 42/48] OvmfPkg/VirtioFsDxe: add helper for composing rename/move destination path Laszlo Ersek
2020-12-18 17:39 ` Ard Biesheuvel
2020-12-19 22:40 ` Laszlo Ersek
2020-12-19 22:54 ` Laszlo Ersek
2020-12-16 21:11 ` Laszlo Ersek [this message]
2020-12-16 21:11 ` [edk2 PATCH 44/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_SETATTR Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 45/48] OvmfPkg/VirtioFsDxe: add helper for determining file size update Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 46/48] OvmfPkg/VirtioFsDxe: add helper for determining access time updates Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 47/48] OvmfPkg/VirtioFsDxe: add helper for determining file mode bits update Laszlo Ersek
2020-12-16 21:11 ` [edk2 PATCH 48/48] OvmfPkg/VirtioFsDxe: handle attribute updates in EFI_FILE_PROTOCOL.SetInfo Laszlo Ersek
2020-12-18 17:44 ` [edk2 PATCH 00/48] ArmVirtPkg, OvmfPkg: virtio filesystem driver Ard Biesheuvel
2020-12-20 0:09 ` Laszlo Ersek
2020-12-20 10:15 ` Ard Biesheuvel
2020-12-21 1:46 ` Laszlo Ersek
2020-12-21 10:10 ` Ard Biesheuvel
2020-12-21 18:02 ` [edk2-devel] " Laszlo Ersek
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