Re: [PATCH] coccinelle: misc: add array_size_dup script to detect missed overlow checks

[Denis Efremov]

On 6/15/20 9:23 PM, Kees Cook wrote:
> On Mon, Jun 15, 2020 at 01:20:45PM +0300, Denis Efremov wrote:
>> Detect an opencoded expression that is used before or after
>> array_size()/array3_size()/struct_size() to compute the same size.
>>
>> Cc: Kees Cook <keescook@xxxxxxxxxxxx>
>> Signed-off-by: Denis Efremov <efremov@xxxxxxxxx>
> 
> Oh, very cool! How much does this find currently?
> 

opencoded expression before the function call:
./drivers/net/ethernet/cavium/liquidio/request_manager.c:98:34-59: WARNING: array_size is used down the code (line 103) to compute the same size
./drivers/media/test-drivers/vivid/vivid-core.c:1120:26-34: WARNING: array_size is used down the code (line 1122) to compute the same size
./drivers/scsi/megaraid/megaraid_sas_fusion.c:5184:11-31: WARNING: array_size is used down the code (line 5191) to compute the same size
./drivers/scsi/megaraid/megaraid_sas_fusion.c:5200:2-37: WARNING: array_size is used down the code (line 5207) to compute the same size
./fs/cifs/misc.c:853:17-39: WARNING: array_size is used down the code (line 858) to compute the same size
./fs/cifs/misc.c:863:17-38: WARNING: array_size is used down the code (line 868) to compute the same size
./drivers/scsi/fnic/fnic_trace.c:562:25-48: WARNING: array_size is used down the code (line 566) to compute the same size

opencoded expression after the function call:
./net/ethtool/ioctl.c:1976:55-66: WARNING: array_size is already used (line 1957) to compute the same size
./net/ethtool/ioctl.c:1921:55-66: WARNING: array_size is already used (line 1909) to compute the same size
./drivers/net/ethernet/cavium/liquidio/request_manager.c:111:29-54: WARNING: array_size is already used (line 103) to compute the same size
./drivers/staging/rts5208/ms.c:2309:55-56: WARNING: array_size is already used (line 2305) to compute the same size
./drivers/video/fbdev/core/fbcon.c:642:52-53: WARNING: array3_size is already used (line 638) to compute the same size
./drivers/video/fbdev/core/fbcon.c:679:47-48: WARNING: array3_size is already used (line 638) to compute the same size
./drivers/usb/misc/sisusbvga/sisusb_con.c:1229:54-56: WARNING: array_size is already used (line 1226) to compute the same size
./fs/afs/cmservice.c:271:45-46: WARNING: array3_size is already used (line 267) to compute the same size
./drivers/mtd/ftl.c:270:49-65: WARNING: array_size is already used (line 266) to compute the same size
./drivers/scsi/qla2xxx/tcm_qla2xxx.c:1608:6-42: WARNING: array_size is already used (line 1605) to compute the same size
./drivers/scsi/qla2xxx/tcm_qla2xxx.c:1613:8-44: WARNING: array_size is already used (line 1605) to compute the same size
./drivers/net/ppp/bsd_comp.c:439:13-37: WARNING: array_size is already used (line 409) to compute the same size
./drivers/net/wireless/ath/ath5k/debug.c:957:20-21: WARNING: array_size is already used (line 934) to compute the same size
./drivers/scsi/fnic/fnic_trace.c:575:3-26: WARNING: array_size is already used (line 566) to compute the same size
./drivers/scsi/fnic/fnic_trace.c:592:32-53: WARNING: array_size is already used (line 580) to compute the same size
./drivers/scsi/fnic/fnic_trace.c:504:30-51: WARNING: array_size is already used (line 492) to compute the same size
./drivers/staging/rts5208/rtsx_chip.c:1475:17-18: WARNING: array_size is already used (line 1458) to compute the same size
./kernel/kexec_file.c:917:8-25: WARNING: array_size is already used (line 913) to compute the same size
./drivers/rapidio/devices/rio_mport_cdev.c:984:8-25: WARNING: array_size is already used (line 978) to compute the same size
./fs/reiserfs/bitmap.c:1463:22-37: WARNING: array_size is already used (line 1459) to compute the same size

duplicate calls:
./drivers/media/test-drivers/vivid/vivid-core.c:1125:59-60: WARNING: same array_size (line 1122)
./drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:142:36-37: WARNING: same array_size (line 138)
./drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:129:41-42: WARNING: same array3_size (line 123)
./drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:146:40-41: WARNING: same array3_size (line 123)
./drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:146:40-41: WARNING: same array3_size (line 129)
./drivers/net/ethernet/cavium/liquidio/octeon_droq.c:289:27-28: WARNING: same array_size (line 284)
./drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c:857:59-60: WARNING: same struct_size (line 854)
./fs/f2fs/super.c:3478:34-35: WARNING: same array_size (line 3478)
./drivers/net/wireless/zydas/zd1211rw/zd_usb.c:1637:45-46: WARNING: same struct_size (line 1634)
./drivers/net/ethernet/netronome/nfp/flower/cmsg.c:221:49-50: WARNING: same struct_size (line 219)
./drivers/staging/rts5208/rtsx_chip.c:1458:36-37: WARNING: same array_size (line 1454)
./drivers/net/ethernet/neterion/vxge/vxge-config.c:2664:59-60: WARNING: same array_size (line 2654)