pstore: Fix incorrect persistent ram buffer mapping

commit 831b624 upstream.

persistent_ram_vmap() returns the page start vaddr.
persistent_ram_iomap() supports non-page-aligned mapping.

persistent_ram_buffer_map() always adds offset-in-page to the vaddr
returned from these two functions, which causes incorrect mapping of
non-page-aligned persistent ram buffer.

By default ftrace_size is 4096 and max_ftrace_cnt is nr_cpu_ids. Without
this patch, the zone_sz in ramoops_init_przs() is 4096/nr_cpu_ids which
might not be page aligned. If the offset-in-page > 2048, the vaddr will be
in next page. If the next page is not mapped, it will cause kernel panic:

[    0.074231] BUG: unable to handle kernel paging request at ffffa19e0081b000
...
[    0.075000] RIP: 0010:persistent_ram_new+0x1f8/0x39f
...
[    0.075000] Call Trace:
[    0.075000]  ramoops_init_przs.part.10.constprop.15+0x105/0x260
[    0.075000]  ramoops_probe+0x232/0x3a0
[    0.075000]  platform_drv_probe+0x3e/0xa0
[    0.075000]  driver_probe_device+0x2cd/0x400
[    0.075000]  __driver_attach+0xe4/0x110
[    0.075000]  ? driver_probe_device+0x400/0x400
[    0.075000]  bus_for_each_dev+0x70/0xa0
[    0.075000]  driver_attach+0x1e/0x20
[    0.075000]  bus_add_driver+0x159/0x230
[    0.075000]  ? do_early_param+0x95/0x95
[    0.075000]  driver_register+0x70/0xc0
[    0.075000]  ? init_pstore_fs+0x4d/0x4d
[    0.075000]  __platform_driver_register+0x36/0x40
[    0.075000]  ramoops_init+0x12f/0x131
[    0.075000]  do_one_initcall+0x4d/0x12c
[    0.075000]  ? do_early_param+0x95/0x95
[    0.075000]  kernel_init_freeable+0x19b/0x222
[    0.075000]  ? rest_init+0xbb/0xbb
[    0.075000]  kernel_init+0xe/0xfc
[    0.075000]  ret_from_fork+0x3a/0x50

Signed-off-by: Bin Yang <bin.yang@intel.com>
[kees: add comments describing the mapping differences, updated commit log]
Fixes: 24c3d2f ("staging: android: persistent_ram: Make it possible to use memory outside of bootmem")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/pstore/ram_core.c

@@ -429,7 +429,12 @@ static void *persistent_ram_vmap(phys_addr_t start, size_t size,
  vaddr = vmap(pages, page_count, VM_MAP, prot);
  kfree(pages);
 
- return vaddr;
+ /*
+ * Since vmap() uses page granularity, we must add the offset
+ * into the page here, to get the byte granularity address
+ * into the mapping to represent the actual "start" location.
+ */
+ return vaddr + offset_in_page(start);
 }
 
 static void *persistent_ram_iomap(phys_addr_t start, size_t size,
@@ -448,6 +453,11 @@ static void *persistent_ram_iomap(phys_addr_t start, size_t size,
  else
  va = ioremap_wc(start, size);
 
+ /*
+ * Since request_mem_region() and ioremap() are byte-granularity
+ * there is no need handle anything special like we do when the
+ * vmap() case in persistent_ram_vmap() above.
+ */
  return va;
 }
 
@@ -468,7 +478,7 @@ static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
  return -ENOMEM;
  }
 
- prz->buffer = prz->vaddr + offset_in_page(start);
+ prz->buffer = prz->vaddr;
  prz->buffer_size = size - sizeof(struct persistent_ram_buffer);
 
  return 0;
@@ -515,7 +525,8 @@ void persistent_ram_free(struct persistent_ram_zone *prz)
 
  if (prz->vaddr) {
  if (pfn_valid(prz->paddr >> PAGE_SHIFT)) {
- vunmap(prz->vaddr);
+ /* We must vunmap() at page-granularity. */
+ vunmap(prz->vaddr - offset_in_page(prz->paddr));
  } else {
  iounmap(prz->vaddr);
  release_mem_region(prz->paddr, prz->size);