mm/cma.c: fail if fixed declaration can't be honored

The description of cma_declare_contiguous() indicates that if the
'fixed' argument is true the reserved contiguous area must be exactly at
the address of the 'base' argument.

However, the function currently allows the 'base', 'size', and 'limit'
arguments to be silently adjusted to meet alignment constraints.  This
commit enforces the documented behavior through explicit checks that
return an error if the region does not fit within a specified region.

Link: http://lkml.kernel.org/r/1561422051-16142-1-git-send-email-opendmb@gmail.com
Fixes: 5ea3b1b2f8ad ("cma: add placement specifier for "cma=" kernel parameter")
Signed-off-by: Doug Berger <opendmb@gmail.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Cc: Yue Hu <huyue2@yulong.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/cma.c b/mm/cma.c
index d415dfc0965e32c98cfe66743b65ebe44872c918..7fe0b8356775f43dd2cae06e9ca7e02e93765923 100644 (file)
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -278,6 +278,12 @@ int __init cma_declare_contiguous(phys_addr_t base,
         */
        alignment = max(alignment,  (phys_addr_t)PAGE_SIZE <<
                          max_t(unsigned long, MAX_ORDER - 1, pageblock_order));
+       if (fixed && base & (alignment - 1)) {
+               ret = -EINVAL;
+               pr_err("Region at %pa must be aligned to %pa bytes\n",
+                       &base, &alignment);
+               goto err;
+       }
        base = ALIGN(base, alignment);
        size = ALIGN(size, alignment);
        limit &= ~(alignment - 1);
@@ -308,6 +314,13 @@ int __init cma_declare_contiguous(phys_addr_t base,
        if (limit == 0 || limit > memblock_end)
                limit = memblock_end;
 
+       if (base + size > limit) {
+               ret = -EINVAL;
+               pr_err("Size (%pa) of region at %pa exceeds limit (%pa)\n",
+                       &size, &base, &limit);
+               goto err;
+       }
+
        /* Reserve memory */
        if (fixed) {
                if (memblock_is_region_reserved(base, size) ||