From db87c98168b1605f067d283fa36a710369c3849d Mon Sep 17 00:00:00 2001 From: Ed Maste Date: Tue, 20 Aug 2024 14:12:47 -0400 Subject: [PATCH] ctl: avoid heap info leak in ctl_request_sense Previously 3 bytes of data from the heap could be leaked to ctl consumers. Reported by: Synacktiv Reviewed by: asomers, mav Sponsored by: The Alpha-Omega Project Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D46091 --- sys/cam/ctl/ctl.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) diff --git a/sys/cam/ctl/ctl.c b/sys/cam/ctl/ctl.c index fac65e15589..845cffe77a5 100644 --- a/sys/cam/ctl/ctl.c +++ b/sys/cam/ctl/ctl.c @@ -9304,14 +9304,8 @@ ctl_request_sense(struct ctl_scsiio *ctsio) sense_ptr = (struct scsi_sense_data *)ctsio->kern_data_ptr; ctsio->kern_sg_entries = 0; ctsio->kern_rel_offset = 0; - - /* - * struct scsi_sense_data, which is currently set to 256 bytes, is - * larger than the largest allowed value for the length field in the - * REQUEST SENSE CDB, which is 252 bytes as of SPC-4. - */ - ctsio->kern_data_len = cdb->length; - ctsio->kern_total_len = cdb->length; + ctsio->kern_data_len = ctsio->kern_total_len = + MIN(cdb->length, sizeof(*sense_ptr)); /* * If we don't have a LUN, we don't have any pending sense.