lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Mon, 21 Jun 2021 14:54:19 -0700
From:   Kees Cook <>
To:     "David S . Miller" <>
Cc:     Kees Cook <>,
        Sunil Goutham <>,
        Linu Cherian <>,
        Geetha sowjanya <>,
        Jerin Jacob <>,
        hariprasad <>,
        Subbaraya Sundeep <>,
        Jakub Kicinski <>,,,
Subject: [PATCH] octeontx2-af: Avoid field-overflowing memcpy()

In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memcpy(), memmove(), and memset(), avoid
intentionally writing across neighboring fields.

To avoid having memcpy() think a u64 "prof" is being written beyond,
adjust the prof member type by adding struct nix_bandprof_s to the union
to match the other structs. This silences the following future warning:

In file included from ./include/linux/string.h:253,
                 from ./include/linux/bitmap.h:10,
                 from ./include/linux/cpumask.h:12,
                 from ./arch/x86/include/asm/cpumask.h:5,
                 from ./arch/x86/include/asm/msr.h:11,
                 from ./arch/x86/include/asm/processor.h:22,
                 from ./arch/x86/include/asm/timex.h:5,
                 from ./include/linux/timex.h:65,
                 from ./include/linux/time32.h:13,
                 from ./include/linux/time.h:60,
                 from ./include/linux/stat.h:19,
                 from ./include/linux/module.h:13,
                 from drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c:11:
In function '__fortify_memcpy_chk',
    inlined from '__fortify_memcpy' at ./include/linux/fortify-string.h:310:2,
    inlined from 'rvu_nix_blk_aq_enq_inst' at drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c:910:5:
./include/linux/fortify-string.h:268:4: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); please use struct_group() [-Wattribute-warning]
  268 |    __write_overflow_field();
      |    ^~~~~~~~~~~~~~~~~~~~~~~~

                        else if (req->ctype == NIX_AQ_CTYPE_BANDPROF)
                                memcpy(&rsp->prof, ctx,
                                       sizeof(struct nix_bandprof_s));

Signed-off-by: Kees Cook <>
 drivers/net/ethernet/marvell/octeontx2/af/mbox.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
index 7d7dfa8d8a3f..770d86262838 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
@@ -746,7 +746,7 @@ struct nix_aq_enq_rsp {
 		struct nix_cq_ctx_s cq;
 		struct nix_rsse_s   rss;
 		struct nix_rx_mce_s mce;
-		u64 prof;
+		struct nix_bandprof_s prof;

Powered by blists - more mailing lists