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[v2,04/63] pcmcia: ray_cs: Split memcpy() to avoid bounds check warning

Message ID 20210818060533.3569517-5-keescook@chromium.org (mailing list archive)
State Not Applicable
Delegated to: Netdev Maintainers
Headers show
Series Introduce strict memcpy() bounds checking | expand

Checks

Context Check Description
netdev/cover_letter success Link
netdev/fixes_present success Link
netdev/patch_count fail Series longer than 15 patches
netdev/tree_selection success Guessed tree name to be net-next
netdev/subject_prefix success Link
netdev/cc_maintainers warning 2 maintainers not CCed: ndesaulniers@google.com nathan@kernel.org
netdev/source_inline success Was 0 now: 0
netdev/verify_signedoff success Link
netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 1 this patch: 1
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/verify_fixes success Link
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 10 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/header_inline success Link

Commit Message

Kees Cook Aug. 18, 2021, 6:04 a.m. UTC
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.

Split memcpy() for each address range to help memcpy() correctly reason
about the bounds checking. Avoids the future warning:

In function 'fortify_memcpy_chk',
    inlined from 'memcpy_toio' at ./include/asm-generic/io.h:1204:2,
    inlined from 'ray_build_header.constprop' at drivers/net/wireless/ray_cs.c:984:3:
./include/linux/fortify-string.h:285:4: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribute-warning]
  285 |    __write_overflow_field(p_size_field, size);
      |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/net/wireless/ray_cs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/ray_cs.c b/drivers/net/wireless/ray_cs.c
index 590bd974d94f..d57bbe551630 100644
--- a/drivers/net/wireless/ray_cs.c
+++ b/drivers/net/wireless/ray_cs.c
@@ -982,7 +982,9 @@  AP to AP	1	1	dest AP		src AP		dest	source
 	if (local->net_type == ADHOC) {
 		writeb(0, &ptx->mac.frame_ctl_2);
 		memcpy_toio(ptx->mac.addr_1, ((struct ethhdr *)data)->h_dest,
-			    2 * ADDRLEN);
+			    ADDRLEN);
+		memcpy_toio(ptx->mac.addr_2, ((struct ethhdr *)data)->h_source,
+			    ADDRLEN);
 		memcpy_toio(ptx->mac.addr_3, local->bss_id, ADDRLEN);
 	} else { /* infrastructure */