linux-kernel - [PATCH] crypto: testmgr - allocate buffers with __GFP

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Message-Id: <20190411192827.72551-1-ebiggers@kernel.org>
Date:   Thu, 11 Apr 2019 12:28:27 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-crypto@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Kees Cook <keescook@...omium.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Laura Abbott <labbott@...hat.com>,
        Rik van Riel <riel@...riel.com>
Subject: [PATCH] crypto: testmgr - allocate buffers with __GFP_COMP

From: Eric Biggers <ebiggers@...gle.com>

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 <ebiggers@...gle.com>
---
 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