diff options
| author | Alexei Starovoitov <ast@kernel.org> | 2024-03-04 19:05:15 -0800 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2024-03-06 10:19:04 -0800 |
| commit | 3e49a866c9dcbd8173e4f3e491293619a9e81fa4 (patch) | |
| tree | 5ed90ad44657e757261e3c827c3a87dd67df8b3e /mm | |
| parent | 8f50d5c423551bfa259af792647a2f4799780ac5 (diff) | |
mm: Enforce VM_IOREMAP flag and range in ioremap_page_range.
There are various users of get_vm_area() + ioremap_page_range() APIs.
Enforce that get_vm_area() was requested as VM_IOREMAP type and range
passed to ioremap_page_range() matches created vm_area to avoid
accidentally ioremap-ing into wrong address range.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/bpf/20240305030516.41519-2-alexei.starovoitov@gmail.com
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/vmalloc.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index d12a17fc0c17..f42f98a127d5 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -307,8 +307,21 @@ static int vmap_range_noflush(unsigned long addr, unsigned long end, int ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot) { + struct vm_struct *area; int err; + area = find_vm_area((void *)addr); + if (!area || !(area->flags & VM_IOREMAP)) { + WARN_ONCE(1, "vm_area at addr %lx is not marked as VM_IOREMAP\n", addr); + return -EINVAL; + } + if (addr != (unsigned long)area->addr || + (void *)end != area->addr + get_vm_area_size(area)) { + WARN_ONCE(1, "ioremap request [%lx,%lx) doesn't match vm_area [%lx, %lx)\n", + addr, end, (long)area->addr, + (long)area->addr + get_vm_area_size(area)); + return -ERANGE; + } err = vmap_range_noflush(addr, end, phys_addr, pgprot_nx(prot), ioremap_max_page_shift); flush_cache_vmap(addr, end); |