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BXVGA: Disallow resolutions higher than 4096x2160

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There's no sense in allowing arbitrarily huge resolutions. Instead, we
now cap the screen size at 4K DCI resolution and will reject attempts
to go bigger with EINVAL.
This commit is contained in:
Andreas Kling 2020-01-28 20:57:40 +01:00
parent c17f80e720
commit 1d2c9dbc3a
1 changed files with 5 additions and 0 deletions
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5
Kernel/Devices/BXVGADevice.cpp
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@ -33,6 +33,9 @@
#include <LibC/errno_numbers.h>
#include <LibC/sys/ioctl_numbers.h>
#define MAX_RESOLUTION_WIDTH 4096
#define MAX_RESOLUTION_HEIGHT 2160
#define VBE_DISPI_IOPORT_INDEX 0x01CE
#define VBE_DISPI_IOPORT_DATA 0x01CF
@ -167,6 +170,8 @@ int BXVGADevice::ioctl(FileDescription&, unsigned request, unsigned arg)
auto* resolution = (FBResolution*)arg;
if (!current->process().validate_read_typed(resolution) || !current->process().validate_write_typed(resolution))
return -EFAULT;
if (resolution->width > MAX_RESOLUTION_WIDTH || resolution->height > MAX_RESOLUTION_HEIGHT)
return -EINVAL;
set_resolution(resolution->width, resolution->height);
resolution->pitch = m_framebuffer_pitch;
resolution->width = m_framebuffer_width;