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SystemServer: Change group ownership on all framebuffer devices

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WindowServer was not able to utilize any other framebuffer device in the
/dev directory due to wrong group ownership of other framebuffer
devices. Therefore we need to ensure that when SystemServer starts,
it checks all directory entries in /dev, searching for framebuffer
devices, and then apply the correct ownership for them.
This commit is contained in:
Liav A 2021-08-06 14:01:03 +03:00 committed by Gunnar Beutner
parent 342e1f0a84
commit 16979bec15
Notes: sideshowbarker 2024-07-18 07:09:22 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/16979bec15a
Pull-request: https://github.com/SerenityOS/serenity/pull/9232
Issue: https://github.com/SerenityOS/serenity/issues/8402
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/gunnarbeutner
1 changed files with 24 additions and 1 deletions
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25
Userland/Services/SystemServer/main.cpp
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@ -9,6 +9,7 @@
#include <AK/ByteBuffer.h>
#include <AK/Debug.h>
#include <LibCore/ConfigFile.h>
#include <LibCore/DirIterator.h>
#include <LibCore/Event.h>
#include <LibCore/EventLoop.h>
#include <LibCore/File.h>
@ -82,6 +83,28 @@ static void chown_wrapper(const char* path, uid_t uid, gid_t gid)
}
}
static void chown_all_framebuffer_devices(group* phys_group)
{
VERIFY(phys_group);
struct stat cur_file_stat;
Core::DirIterator di("/dev/", Core::DirIterator::SkipParentAndBaseDir);
if (di.has_error())
VERIFY_NOT_REACHED();
while (di.has_next()) {
auto entry_name = di.next_full_path();
auto rc = stat(entry_name.characters(), &cur_file_stat);
if (rc < 0)
continue;
if (!S_ISBLK(cur_file_stat.st_mode))
continue;
// FIXME: Try to find a way to not hardcode the major number of framebuffer device nodes.
if (major(cur_file_stat.st_rdev) != 29)
continue;
chown_wrapper(entry_name.characters(), 0, phys_group->gr_gid);
}
}
static void prepare_devfs()
{
// FIXME: Find a better way to all of this stuff, without hardcoding all of this!
@ -113,7 +136,7 @@ static void prepare_devfs()
auto phys_group = getgrnam("phys");
VERIFY(phys_group);
chown_wrapper("/dev/fb0", 0, phys_group->gr_gid);
chown_all_framebuffer_devices(phys_group);
chown_wrapper("/dev/keyboard0", 0, phys_group->gr_gid);