From: Eric Biggers To: linux-crypto@vger.kernel.org, Herbert Xu Cc: Kees Cook , Dmitry Vyukov , Geert Uytterhoeven , linux-security-module , Linux ARM , Linux Kernel Mailing List , Laura Abbott , Rik van Riel Subject: [PATCH] crypto: testmgr - allocate buffers with __GFP_COMP Date: Thu, 11 Apr 2019 12:28:27 -0700 Message-ID: <20190411192827.72551-1-ebiggers@kernel.org> (raw) In-Reply-To: <20190411192607.GD225654@gmail.com> From: Eric Biggers This is needed so that CONFIG_HARDENED_USERCOPY_PAGESPAN=y doesn't incorrectly report a buffer overflow when the destination of copy_from_iter() spans the page boundary in the 2-page buffer. Fixes: 3f47a03df6e8 ("crypto: testmgr - add testvec_config struct and helper functions") Signed-off-by: Eric Biggers --- crypto/testmgr.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/crypto/testmgr.c b/crypto/testmgr.c index 0f6bfb6ce6a46..3522c0bed2492 100644 --- a/crypto/testmgr.c +++ b/crypto/testmgr.c @@ -156,7 +156,8 @@ static int __testmgr_alloc_buf(char *buf[XBUFSIZE], int order) int i; for (i = 0; i < XBUFSIZE; i++) { - buf[i] = (char *)__get_free_pages(GFP_KERNEL, order); + buf[i] = (char *)__get_free_pages(GFP_KERNEL | __GFP_COMP, + order); if (!buf[i]) goto err_free_buf; } -- 2.21.0.392.gf8f6787159e-goog