src/patches/linux/linux-5.9-crypto_testmgr_allocate_buffers_with____GFP_COMP.patch

   1 From: Eric Biggers <ebiggers@kernel.org>
   2 To: linux-crypto@vger.kernel.org, Herbert Xu <herbert@gondor.apana.org.au>
   3 Cc: Kees Cook <keescook@chromium.org>,
   4         Dmitry Vyukov <dvyukov@google.com>,
   5         Geert Uytterhoeven <geert@linux-m68k.org>,
   6         linux-security-module <linux-security-module@vger.kernel.org>,
   7         Linux ARM <linux-arm-kernel@lists.infradead.org>,
   8         Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
   9         Laura Abbott <labbott@redhat.com>,
  10         Rik van Riel <riel@surriel.com>
  11 Subject: [PATCH] crypto: testmgr - allocate buffers with __GFP_COMP
  12 Date: Thu, 11 Apr 2019 12:28:27 -0700
  13 Message-ID: <20190411192827.72551-1-ebiggers@kernel.org> (raw)
  14 In-Reply-To: <20190411192607.GD225654@gmail.com>
  15
  16 From: Eric Biggers <ebiggers@google.com>
  17
  18 This is needed so that CONFIG_HARDENED_USERCOPY_PAGESPAN=y doesn't
  19 incorrectly report a buffer overflow when the destination of
  20 copy_from_iter() spans the page boundary in the 2-page buffer.
  21
  22 Fixes: 3f47a03df6e8 ("crypto: testmgr - add testvec_config struct and helper functions")
  23 Signed-off-by: Eric Biggers <ebiggers@google.com>
  24 ---
  25  crypto/testmgr.c | 3 ++-
  26  1 file changed, 2 insertions(+), 1 deletion(-)
  27
  28 diff --git a/crypto/testmgr.c b/crypto/testmgr.c
  29 index 0f6bfb6ce6a46..3522c0bed2492 100644
  30 --- a/crypto/testmgr.c
  31 +++ b/crypto/testmgr.c
  32 @@ -156,7 +156,8 @@ static int __testmgr_alloc_buf(char *buf[XBUFSIZE], int order)
  33         int i;
  34
  35         for (i = 0; i < XBUFSIZE; i++) {
  36 -               buf[i] = (char *)__get_free_pages(GFP_KERNEL, order);
  37 +               buf[i] = (char *)__get_free_pages(GFP_KERNEL | __GFP_COMP,
  38 +                                                 order);
  39                 if (!buf[i])
  40                         goto err_free_buf;
  41         }
  42 --
  43 2.21.0.392.gf8f6787159e-goog