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rus_vm_fault(): cleanup and early exit on NULL access

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Change-Id: I90b18988989d4e377ed9c35df6b2e6bcdddd13b6
This commit is contained in:
Balazs Gerofi
2019-04-17 11:30:37 +09:00
committed by Masamichi Takagi
parent cc07d6e017
commit 80f964e44f
1 changed files with 41 additions and 65 deletions
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106
executer/kernel/mcctrl/syscall.c
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@ -557,27 +557,26 @@ static int rus_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
struct ikc_scd_packet packet = { };
unsigned long rsysnum = 0;
int ret = 0;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)
dprintk("mcctrl:page fault:flags %#x pgoff %#lx va %#lx page %p\n",
vmf->flags, vmf->pgoff, vmf->address, vmf->page);
unsigned long addr = vmf->address;
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
dprintk("mcctrl:page fault:flags %#x pgoff %#lx va %p page %p\n",
vmf->flags, vmf->pgoff, vmf->virtual_address, vmf->page);
void __user *addr = vmf->virtual_address;
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
/* Look up per-process structure */
ppd = mcctrl_get_per_proc_data(usrdata, task_tgid_vnr(task));
if (!ppd) {
dprintk("%s: INFO: no per-process structure for pid %d (tid %d), trying to use pid %d\n",
__func__, task_tgid_vnr(task), task_pid_vnr(task),
vma->vm_mm->owner->pid);
pr_err("%s: INFO: no per-process structure for "
"pid %d (tid %d), trying to use pid %d\n",
__func__,
task_tgid_vnr(task), task_pid_vnr(task),
vma->vm_mm->owner->pid);
task = vma->vm_mm->owner;
ppd = mcctrl_get_per_proc_data(usrdata, task_tgid_vnr(task));
}
if (!ppd) {
kprintf("%s: ERROR: no per-process structure for PID %d??\n",
pr_err("%s: ERROR: no per-process structure for PID %d??\n",
__func__, task_tgid_vnr(task));
ret = VM_FAULT_SIGBUS;
goto no_ppd;
@ -599,27 +598,25 @@ static int rus_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
pr_ptd("put", task_pid_vnr(task), ptd);
}
/* Don't even bother looking up NULL */
if (!addr) {
pr_warn("%s: WARNING: attempted NULL pointer access\n",
__func__);
ret = VM_FAULT_SIGBUS;
goto put_and_out;
}
for (try = 1; ; ++try) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)
error = translate_rva_to_rpa(usrdata->os, ppd->rpgtable,
vmf->address, &rpa, &pgsize);
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
error = translate_rva_to_rpa(usrdata->os, ppd->rpgtable,
(unsigned long)vmf->virtual_address,
&rpa, &pgsize);
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
(unsigned long)addr, &rpa, &pgsize);
#define NTRIES 2
if (!error || (try >= NTRIES)) {
if (error) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)
pr_err("%s: error translating 0x%#lx (req: TID: %u, syscall: %lu)\n",
__func__, vmf->address,
packet.fault_tid, rsysnum);
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
pr_err("%s: error translating 0x%p (req: TID: %u, syscall: %lu)\n",
__func__, vmf->virtual_address,
packet.fault_tid, rsysnum);
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
pr_err("%s: error translating 0x%#lx "
"(req: TID: %u, syscall: %lu)\n",
__func__,
(unsigned long)addr,
packet.fault_tid, rsysnum);
}
break;
@ -630,23 +627,14 @@ static int rus_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
#define PF_WRITE 0x02
reason |= PF_WRITE;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)
error = remote_page_fault(usrdata, (void *)vmf->address,
error = remote_page_fault(usrdata, (void *)addr,
reason, ppd, &packet);
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
error = remote_page_fault(usrdata, vmf->virtual_address,
reason, ppd, &packet);
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
if (error) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)
pr_err("%s: error forwarding PF for 0x%#lx (req: TID: %d, syscall: %lu)\n",
__func__, vmf->address,
packet.fault_tid, rsysnum);
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
pr_err("%s: error forwarding PF for 0x%p (req: TID: %d, syscall: %lu)\n",
__func__, vmf->virtual_address,
packet.fault_tid, rsysnum);
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
pr_err("%s: error forwarding PF for 0x%#lx "
"(req: TID: %d, syscall: %lu)\n",
__func__,
(unsigned long)addr,
packet.fault_tid, rsysnum);
break;
}
}
@ -655,11 +643,7 @@ static int rus_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
goto put_and_out;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)
rva = vmf->address & ~(pgsize - 1);
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
rva = (unsigned long)vmf->virtual_address & ~(pgsize - 1);
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
rva = (unsigned long)addr & ~(pgsize - 1);
rpa = rpa & ~(pgsize - 1);
phys = ihk_device_map_memory(dev, rpa, pgsize);
@ -679,17 +663,13 @@ static int rus_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
error = vm_insert_page(vma, rva+(pix*PAGE_SIZE), page);
if (error) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)
pr_err("%s: error inserting mapping for 0x%#lx (req: TID: %d, syscall: %lu) error: %d, vm_start: 0x%lx, vm_end: 0x%lx\n",
__func__, vmf->address,
packet.fault_tid, rsysnum,
error, vma->vm_start, vma->vm_end);
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
pr_err("%s: error inserting mapping for 0x%p (req: TID: %d, syscall: %lu) error: %d, vm_start: 0x%lx, vm_end: 0x%lx\n",
__func__, vmf->virtual_address,
packet.fault_tid, rsysnum, error,
vma->vm_start, vma->vm_end);
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
pr_err("%s: error inserting mapping for 0x%#lx "
"(req: TID: %d, syscall: %lu) error: %d,"
" vm_start: 0x%lx, vm_end: 0x%lx\n",
__func__,
(unsigned long)addr, packet.fault_tid,
rsysnum, error,
vma->vm_start, vma->vm_end);
}
}
else
@ -715,15 +695,11 @@ static int rus_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
#endif
ihk_device_unmap_memory(dev, phys, pgsize);
if (error) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)
pr_err("%s: remote PF failed for 0x%#lx, pgoff: %lu (req: TID: %d, syscall: %lu)\n",
__func__, vmf->address, vmf->pgoff,
packet.fault_tid, rsysnum);
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
pr_err("%s: remote PF failed for 0x%p, pgoff: %lu (req: TID: %d, syscall: %lu)\n",
__func__, vmf->virtual_address, vmf->pgoff,
packet.fault_tid, rsysnum);
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0) */
pr_err("%s: remote PF failed for 0x%#lx, pgoff: %lu"
" (req: TID: %d, syscall: %lu)\n",
__func__,
(unsigned long)addr, vmf->pgoff,
packet.fault_tid, rsysnum);
ret = VM_FAULT_SIGBUS;
goto put_and_out;
}