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Kernel+Userland: Add mount MS_SRCHIDDEN option

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Either we mount from a loop device or other source, the user might want
to obfuscate the given source for security reasons, so this option will
ensure this will happen.
If passed during a mount, the source will be hidden when reading from
the /sys/kernel/df node.
This commit is contained in:
Liav A 2024-02-10 12:27:32 +02:00 committed by Andrew Kaster
parent 0739b5df11
commit 0734de9f9a
Notes: sideshowbarker 2024-07-17 06:54:15 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/0734de9f9a
Pull-request: https://github.com/SerenityOS/serenity/pull/23138
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/gmta
3 changed files with 21 additions and 11 deletions
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1
Kernel/API/POSIX/unistd.h
View file

@ -30,6 +30,7 @@ extern "C" {
#define MS_WXALLOWED (1 << 6)
#define MS_AXALLOWED (1 << 7)
#define MS_NOREGULAR (1 << 8)
#define MS_SRCHIDDEN (1 << 9)
enum {
_SC_MONOTONIC_CLOCK,

27
Kernel/FileSystem/SysFS/Subsystems/Kernel/DiskUsage.cpp
View file

@ -5,6 +5,7 @@
*/
#include <AK/JsonObjectSerializer.h>
#include <Kernel/API/POSIX/unistd.h>
#include <Kernel/Devices/Loop/LoopDevice.h>
#include <Kernel/FileSystem/FileBackedFileSystem.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Kernel/DiskUsage.h>
@ -40,18 +41,22 @@ ErrorOr<void> SysFSDiskUsage::try_generate(KBufferBuilder& builder)
TRY(fs_object.add("readonly"sv, fs.is_readonly()));
TRY(fs_object.add("mount_flags"sv, mount.flags()));
if (fs.is_file_backed()) {
auto& file = static_cast<const FileBackedFileSystem&>(fs).file();
if (file.is_loop_device()) {
auto& device = static_cast<LoopDevice const&>(file);
auto path = TRY(device.custody().try_serialize_absolute_path());
TRY(fs_object.add("source"sv, path->view()));
} else {
auto pseudo_path = TRY(static_cast<const FileBackedFileSystem&>(fs).file_description().pseudo_path());
TRY(fs_object.add("source"sv, pseudo_path->view()));
}
if (mount.flags() & MS_SRCHIDDEN) {
TRY(fs_object.add("source"sv, "unknown"));
} else {
TRY(fs_object.add("source"sv, "none"));
if (fs.is_file_backed()) {
auto& file = static_cast<const FileBackedFileSystem&>(fs).file();
if (file.is_loop_device()) {
auto& device = static_cast<LoopDevice const&>(file);
auto path = TRY(device.custody().try_serialize_absolute_path());
TRY(fs_object.add("source"sv, path->view()));
} else {
auto pseudo_path = TRY(static_cast<const FileBackedFileSystem&>(fs).file_description().pseudo_path());
TRY(fs_object.add("source"sv, pseudo_path->view()));
}
} else {
TRY(fs_object.add("source"sv, "none"));
}
}
TRY(fs_object.finish());

4
Userland/Utilities/mount.cpp
View file

@ -43,6 +43,8 @@ static int parse_options(StringView options)
flags |= MS_AXALLOWED;
else if (part == "noregular")
flags |= MS_NOREGULAR;
else if (part == "srchidden")
flags |= MS_SRCHIDDEN;
else
warnln("Ignoring invalid option: {}", part);
}
@ -181,6 +183,8 @@ static ErrorOr<void> print_mounts()
out(",nodev");
if (mount_flags & MS_NOREGULAR)
out(",noregular");
if (mount_flags & MS_SRCHIDDEN)
out(",srcobfuscate");
if (mount_flags & MS_NOEXEC)
out(",noexec");
if (mount_flags & MS_NOSUID)