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Message-ID: <3117d99434303b00f5057bfbe4615cf8cd26b72a.camel@linux.ibm.com> Date: Wed, 18 Oct 2023 14:16:18 -0400 From: Mimi Zohar <zohar@...ux.ibm.com> To: "Gustavo A. R. Silva" <gustavoars@...nel.org>, Dmitry Kasatkin <dmitry.kasatkin@...il.com>, Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>, "Serge E. Hallyn" <serge@...lyn.com> Cc: linux-integrity@...r.kernel.org, linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH] ima: Add __counted_by for struct modsig and use struct_size() On Mon, 2023-10-09 at 13:52 -0600, Gustavo A. R. Silva wrote: > Prepare for the coming implementation by GCC and Clang of the __counted_by > attribute. Flexible array members annotated with __counted_by can have > their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for > array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family > functions). > > Also, relocate `hdr->raw_pkcs7_len = sig_len;` so that the __counted_by > annotation has effect, and flex-array member `raw_pkcs7` can be properly > bounds-checked at run-time. > > While there, use struct_size() helper, instead of the open-coded > version, to calculate the size for the allocation of the whole > flexible structure, including of course, the flexible-array member. > > This code was found with the help of Coccinelle, and audited and > fixed manually. > > Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org> Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>
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