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arbitrary.c
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arbitrary.c
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/*
* BSD 3-Clause License
*
* Copyright (c) 2024, Zhuo Ying Jiang Li
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "utils.h"
#include <machine/pmap.h> // machine dependent
extern struct pmap kernel_pmap_store;
// subject to PAN/SMAP
int arbitrary_read_ioctl_handler(struct dvkm_io *io)
{
int error, preserve_cheri_caps;
void * __capability ubuf;
vm_offset_t target_addr;
void * target_ptr;
size_t ubufsize;
target_addr = io->target_addr;
ubuf = io->output_buffer;
ubufsize = io->output_buffer_size;
preserve_cheri_caps = io->preserve_cheri_caps;
// forge
#ifdef __CHERI_PURE_CAPABILITY__
target_ptr = cheri_setaddress(kernel_root_cap, target_addr);
#else
target_ptr = (void *)target_addr;
#endif
if (preserve_cheri_caps) {
error = copyoutcap(target_ptr, ubuf, ubufsize);
} else {
error = copyout(target_ptr, ubuf, ubufsize);
}
return (error);
}
int arbitrary_write_ioctl_handler(struct dvkm_io *io)
{
int error, preserve_cheri_caps;
void * __capability ubuf;
vm_offset_t target_addr;
void * target_ptr;
size_t ubufsize;
target_addr = io->target_addr;
ubuf = io->input_buffer;
ubufsize = io->input_buffer_size;
preserve_cheri_caps = io->preserve_cheri_caps;
// forge
#ifdef __CHERI_PURE_CAPABILITY__
target_ptr = cheri_setaddress(kernel_root_cap, target_addr);
#else
target_ptr = (void *)target_addr;
#endif
if (preserve_cheri_caps) {
error = copyincap(ubuf, target_ptr, ubufsize);
} else {
error = copyin(ubuf, target_ptr, ubufsize);
}
return (error);
}
int arbitrary_increment_ioctl_handler(struct dvkm_io *io)
{
int error = 0, preserve_cheri_caps;
vm_offset_t target_addr;
void * target_ptr;
int increment;
target_addr = io->target_addr;
preserve_cheri_caps = io->preserve_cheri_caps;
increment = io->increment;
// forge
#ifdef __CHERI_PURE_CAPABILITY__
target_ptr = cheri_setaddress(kernel_root_cap, target_addr);
#else
target_ptr = (void *)target_addr;
#endif
if (preserve_cheri_caps) {
*(uintptr_t *)target_ptr += increment;
} else {
*(char *)target_ptr += increment;
}
return (error);
}
int read_l0(struct dvkm_io *io)
{
int error = 0;
void * __capability ubuf;
size_t ubufsize;
pmap_t pmap;
pd_entry_t *l0;
ubuf = io->output_buffer;
ubufsize = io->output_buffer_size;
// get the pmap for the current process
pmap = vmspace_pmap(curproc->p_vmspace);
l0 = pmap->pm_l0;
#ifdef DEBUG
uint64_t ttbr = pmap->pm_ttbr;
pd_entry_t *kl0 = kernel_pmap->pm_l0;
uprintf("[DEBUG] curproc pm_l0 = %p\n", l0);
uprintf("[DEBUG] TTBR = 0x%lx\n", ttbr);
uprintf("[DEBUG] kernel_pmap l0 = %p\n", kl0);
uprintf("[DEBUG] ubuf = %p\n", (__cheri_fromcap void *)ubuf);
uprintf("[DEBUG] ubufsize = 0x%lx\n", ubufsize);
#endif
if (ubufsize < sizeof(uintptr_t)) {
error = copyout(&l0, ubuf, ubufsize);
} else {
error = copyoutcap(&l0, ubuf, ubufsize);
}
return (error);
}