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Kernel: Remove SmapDisabler in sys$ioctl()

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Use copy_{to,from}_user() in the various File::ioctl() implementations
instead of disabling SMAP wholesale in sys$ioctl().

This patch does not port IPv4Socket::ioctl() to those API's since that
will be more involved. That function now creates a local SmapDisabler.
This commit is contained in:
Andreas Kling 2020-07-31 00:17:25 +02:00
parent be7add690d
commit 292cd53192
5 changed files with 78 additions and 51 deletions
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30
Kernel/Devices/MBVGADevice.cpp
View file

@ -81,32 +81,38 @@ int MBVGADevice::ioctl(FileDescription&, unsigned request, FlatPtr arg)
auto* out = (size_t*)arg;
if (!Process::current()->validate_write_typed(out))
return -EFAULT;
*out = framebuffer_size_in_bytes();
size_t value = framebuffer_size_in_bytes();
copy_to_user(out, &value);
return 0;
}
case FB_IOCTL_GET_BUFFER: {
auto* index = (int*)arg;
if (!Process::current()->validate_write_typed(index))
return -EFAULT;
*index = 0;
int value = 0;
copy_to_user(index, &value);
return 0;
}
case FB_IOCTL_GET_RESOLUTION: {
auto* resolution = (FBResolution*)arg;
if (!Process::current()->validate_write_typed(resolution))
auto* user_resolution = (FBResolution*)arg;
if (!Process::current()->validate_write_typed(user_resolution))
return -EFAULT;
resolution->pitch = m_framebuffer_pitch;
resolution->width = m_framebuffer_width;
resolution->height = m_framebuffer_height;
FBResolution resolution;
resolution.pitch = m_framebuffer_pitch;
resolution.width = m_framebuffer_width;
resolution.height = m_framebuffer_height;
copy_to_user(user_resolution, &resolution);
return 0;
}
case FB_IOCTL_SET_RESOLUTION: {
auto* resolution = (FBResolution*)arg;
if (!Process::current()->validate_read_typed(resolution) || !Process::current()->validate_write_typed(resolution))
auto* user_resolution = (FBResolution*)arg;
if (!Process::current()->validate_read_typed(user_resolution) || !Process::current()->validate_write_typed(user_resolution))
return -EFAULT;
resolution->pitch = m_framebuffer_pitch;
resolution->width = m_framebuffer_width;
resolution->height = m_framebuffer_height;
FBResolution resolution;
resolution.pitch = m_framebuffer_pitch;
resolution.width = m_framebuffer_width;
resolution.height = m_framebuffer_height;
copy_to_user(user_resolution, &resolution);
return 0;
}
default: