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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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45
Kernel/Devices/BXVGADevice.cpp
View file

@ -26,11 +26,11 @@
#include <AK/Checked.h>
#include <Kernel/Devices/BXVGADevice.h>
#include <Kernel/IO.h>
#include <Kernel/PCI/Access.h>
#include <Kernel/Process.h>
#include <Kernel/VM/AnonymousVMObject.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/IO.h>
#include <LibC/errno_numbers.h>
#include <LibC/sys/ioctl_numbers.h>
@ -200,14 +200,16 @@ int BXVGADevice::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 = m_y_offset == 0 ? 0 : 1;
int value = m_y_offset == 0 ? 0 : 1;
copy_to_user(index, &value);
return 0;
}
case FB_IOCTL_SET_BUFFER: {
@ -217,35 +219,42 @@ int BXVGADevice::ioctl(FileDescription&, unsigned request, FlatPtr arg)
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_write_typed(user_resolution))
return -EFAULT;
if (resolution->width > MAX_RESOLUTION_WIDTH || resolution->height > MAX_RESOLUTION_HEIGHT)
FBResolution resolution;
if (!Process::current()->validate_read_and_copy_typed(&resolution, user_resolution))
return -EFAULT;
if (resolution.width > MAX_RESOLUTION_WIDTH || resolution.height > MAX_RESOLUTION_HEIGHT)
return -EINVAL;
if (!set_resolution(resolution->width, resolution->height)) {
if (!set_resolution(resolution.width, resolution.height)) {
#ifdef BXVGA_DEBUG
dbg() << "Reverting Resolution: [" << m_framebuffer_width << "x" << m_framebuffer_height << "]";
#endif
resolution->pitch = m_framebuffer_pitch;
resolution->width = m_framebuffer_width;
resolution->height = m_framebuffer_height;
resolution.pitch = m_framebuffer_pitch;
resolution.width = m_framebuffer_width;
resolution.height = m_framebuffer_height;
copy_to_user(user_resolution, &resolution);
return -EINVAL;
}
#ifdef BXVGA_DEBUG
dbg() << "New resolution: [" << m_framebuffer_width << "x" << m_framebuffer_height << "]";
#endif
resolution->pitch = m_framebuffer_pitch;
resolution->width = m_framebuffer_width;
resolution->height = m_framebuffer_height;
resolution.pitch = m_framebuffer_pitch;
resolution.width = m_framebuffer_width;
resolution.height = m_framebuffer_height;
copy_to_user(user_resolution, &resolution);
return 0;
}
default: