diff options
| author | Laszlo Ersek <lersek@redhat.com> | 2020-12-16 22:11:24 +0100 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-12-21 17:16:23 +0000 |
| commit | 13a506d4f57edbafbdcc946e270b9d9664d454ce (patch) | |
| tree | 17b29275c201a8d0ea5555a9770c0246bba39ff3 /OvmfPkg/VirtioFsDxe/Helpers.c | |
| parent | 3cbd54b92f60002d300b7eb689f4eff9e685dc62 (diff) | |
| download | edk2-13a506d4f57edbafbdcc946e270b9d9664d454ce.tar.gz edk2-13a506d4f57edbafbdcc946e270b9d9664d454ce.tar.bz2 edk2-13a506d4f57edbafbdcc946e270b9d9664d454ce.zip | |
OvmfPkg/VirtioFsDxe: add helper for determining file mode bits update
Add the VirtioFsGetFuseModeUpdate() function, for determining whether an
EFI_FILE_PROTOCOL.SetInfo() invocation requests an update to the file mode
bits.
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>
Message-Id: <20201216211125.19496-48-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Diffstat (limited to 'OvmfPkg/VirtioFsDxe/Helpers.c')
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/Helpers.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/OvmfPkg/VirtioFsDxe/Helpers.c b/OvmfPkg/VirtioFsDxe/Helpers.c index c56c60640a..443bbdc616 100644 --- a/OvmfPkg/VirtioFsDxe/Helpers.c +++ b/OvmfPkg/VirtioFsDxe/Helpers.c @@ -2319,3 +2319,98 @@ VirtioFsGetFuseTimeUpdates ( return EFI_SUCCESS;
}
+
+/**
+ Given an EFI_FILE_INFO object received in an EFI_FILE_PROTOCOL.SetInfo()
+ call, determine whether updating the file mode bits of the file is necessary,
+ relative to an EFI_FILE_INFO object describing the current state of the file.
+
+ @param[in] Info The EFI_FILE_INFO describing the current state of the
+ file. The caller is responsible for populating Info on
+ input with VirtioFsFuseAttrToEfiFileInfo(), from the
+ current FUSE attributes of the file. The Info->Size and
+ Info->FileName members are ignored.
+
+ @param[in] NewInfo The EFI_FILE_INFO object received in the
+ EFI_FILE_PROTOCOL.SetInfo() call.
+
+ @param[out] Update Set to TRUE on output if the file mode bits need to be
+ updated. Set to FALSE otherwise.
+
+ @param[out] Mode If Update is set to TRUE, then Mode provides the file
+ mode bits to set. Otherwise, Mode is not written to.
+
+ @retval EFI_SUCCESS Output parameters have been set successfully.
+
+ @retval EFI_ACCESS_DENIED NewInfo requests toggling an unknown bit in the
+ Attribute bitmask.
+
+ @retval EFI_ACCESS_DENIED NewInfo requests toggling EFI_FILE_DIRECTORY in
+ the Attribute bitmask.
+**/
+EFI_STATUS
+VirtioFsGetFuseModeUpdate (
+ IN EFI_FILE_INFO *Info,
+ IN EFI_FILE_INFO *NewInfo,
+ OUT BOOLEAN *Update,
+ OUT UINT32 *Mode
+ )
+{
+ UINT64 Toggle;
+ BOOLEAN IsDirectory;
+ BOOLEAN IsWriteable;
+ BOOLEAN WillBeWriteable;
+
+ Toggle = Info->Attribute ^ NewInfo->Attribute;
+ if ((Toggle & ~EFI_FILE_VALID_ATTR) != 0) {
+ //
+ // Unknown attribute requested.
+ //
+ return EFI_ACCESS_DENIED;
+ }
+ if ((Toggle & EFI_FILE_DIRECTORY) != 0) {
+ //
+ // EFI_FILE_DIRECTORY cannot be toggled.
+ //
+ return EFI_ACCESS_DENIED;
+ }
+
+ IsDirectory = (BOOLEAN)((Info->Attribute & EFI_FILE_DIRECTORY) != 0);
+ IsWriteable = (BOOLEAN)((Info->Attribute & EFI_FILE_READ_ONLY) == 0);
+ WillBeWriteable = (BOOLEAN)((NewInfo->Attribute & EFI_FILE_READ_ONLY) == 0);
+
+ if (IsWriteable == WillBeWriteable) {
+ *Update = FALSE;
+ return EFI_SUCCESS;
+ }
+
+ if (IsDirectory) {
+ if (WillBeWriteable) {
+ *Mode = (VIRTIO_FS_FUSE_MODE_PERM_RWXU |
+ VIRTIO_FS_FUSE_MODE_PERM_RWXG |
+ VIRTIO_FS_FUSE_MODE_PERM_RWXO);
+ } else {
+ *Mode = (VIRTIO_FS_FUSE_MODE_PERM_RUSR |
+ VIRTIO_FS_FUSE_MODE_PERM_XUSR |
+ VIRTIO_FS_FUSE_MODE_PERM_RGRP |
+ VIRTIO_FS_FUSE_MODE_PERM_XGRP |
+ VIRTIO_FS_FUSE_MODE_PERM_ROTH |
+ VIRTIO_FS_FUSE_MODE_PERM_XOTH);
+ }
+ } else {
+ if (WillBeWriteable) {
+ *Mode = (VIRTIO_FS_FUSE_MODE_PERM_RUSR |
+ VIRTIO_FS_FUSE_MODE_PERM_WUSR |
+ VIRTIO_FS_FUSE_MODE_PERM_RGRP |
+ VIRTIO_FS_FUSE_MODE_PERM_WGRP |
+ VIRTIO_FS_FUSE_MODE_PERM_ROTH |
+ VIRTIO_FS_FUSE_MODE_PERM_WOTH);
+ } else {
+ *Mode = (VIRTIO_FS_FUSE_MODE_PERM_RUSR |
+ VIRTIO_FS_FUSE_MODE_PERM_RGRP |
+ VIRTIO_FS_FUSE_MODE_PERM_ROTH);
+ }
+ }
+ *Update = TRUE;
+ return EFI_SUCCESS;
+}
|