Date: Thu, 9 May 2019 22:31:47 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r347409 - in stable/11/sys/amd64: include vmm Message-ID: <201905092231.x49MVlQp012302@repo.freebsd.org>
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Author: jhb Date: Thu May 9 22:31:47 2019 New Revision: 347409 URL: https://svnweb.freebsd.org/changeset/base/347409 Log: MFC 333639: vmmdev: return EFAULT when trying to read beyond VM system memory max address Currently, when using dd(1) to take a VM memory image, the capture never ends, reading zeroes when it's beyond VM system memory max address. Return EFAULT when trying to read beyond VM system memory max address. Modified: stable/11/sys/amd64/include/vmm.h stable/11/sys/amd64/vmm/vmm.c stable/11/sys/amd64/vmm/vmm_dev.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/amd64/include/vmm.h ============================================================================== --- stable/11/sys/amd64/include/vmm.h Thu May 9 22:25:12 2019 (r347408) +++ stable/11/sys/amd64/include/vmm.h Thu May 9 22:31:47 2019 (r347409) @@ -201,6 +201,7 @@ int vm_mmap_getnext(struct vm *vm, vm_paddr_t *gpa, in vm_ooffset_t *segoff, size_t *len, int *prot, int *flags); int vm_get_memseg(struct vm *vm, int ident, size_t *len, bool *sysmem, struct vm_object **objptr); +vm_paddr_t vmm_sysmem_maxaddr(struct vm *vm); void *vm_gpa_hold(struct vm *, int vcpuid, vm_paddr_t gpa, size_t len, int prot, void **cookie); void vm_gpa_release(void *cookie); Modified: stable/11/sys/amd64/vmm/vmm.c ============================================================================== --- stable/11/sys/amd64/vmm/vmm.c Thu May 9 22:25:12 2019 (r347408) +++ stable/11/sys/amd64/vmm/vmm.c Thu May 9 22:31:47 2019 (r347409) @@ -773,8 +773,8 @@ sysmem_mapping(struct vm *vm, struct mem_map *mm) return (false); } -static vm_paddr_t -sysmem_maxaddr(struct vm *vm) +vm_paddr_t +vmm_sysmem_maxaddr(struct vm *vm) { struct mem_map *mm; vm_paddr_t maxaddr; @@ -883,7 +883,7 @@ vm_assign_pptdev(struct vm *vm, int bus, int slot, int if (ppt_assigned_devices(vm) == 0) { KASSERT(vm->iommu == NULL, ("vm_assign_pptdev: iommu must be NULL")); - maxaddr = sysmem_maxaddr(vm); + maxaddr = vmm_sysmem_maxaddr(vm); vm->iommu = iommu_create_domain(maxaddr); if (vm->iommu == NULL) return (ENXIO); Modified: stable/11/sys/amd64/vmm/vmm_dev.c ============================================================================== --- stable/11/sys/amd64/vmm/vmm_dev.c Thu May 9 22:25:12 2019 (r347408) +++ stable/11/sys/amd64/vmm/vmm_dev.c Thu May 9 22:31:47 2019 (r347409) @@ -171,7 +171,7 @@ static int vmmdev_rw(struct cdev *cdev, struct uio *uio, int flags) { int error, off, c, prot; - vm_paddr_t gpa; + vm_paddr_t gpa, maxaddr; void *hpa, *cookie; struct vmmdev_softc *sc; @@ -187,6 +187,7 @@ vmmdev_rw(struct cdev *cdev, struct uio *uio, int flag return (error); prot = (uio->uio_rw == UIO_WRITE ? VM_PROT_WRITE : VM_PROT_READ); + maxaddr = vmm_sysmem_maxaddr(sc->vm); while (uio->uio_resid > 0 && error == 0) { gpa = uio->uio_offset; off = gpa & PAGE_MASK; @@ -202,7 +203,7 @@ vmmdev_rw(struct cdev *cdev, struct uio *uio, int flag */ hpa = vm_gpa_hold(sc->vm, VM_MAXCPU - 1, gpa, c, prot, &cookie); if (hpa == NULL) { - if (uio->uio_rw == UIO_READ) + if (uio->uio_rw == UIO_READ && gpa < maxaddr) error = uiomove(__DECONST(void *, zero_region), c, uio); else
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