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Hallyn" , =?iso-8859-1?Q?Micka=EBl_Sala=FCn?= , Kees Cook , linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] ima: Fix stack-out-of-bounds in is_bprm_creds_for_exec() Message-ID: References: <20251219195456.912190-1-carges@cloudflare.com> <20251221180128.1026760-1-carges@cloudflare.com> <3aeed1ff9388f09555bf5c6ade03cbe9ce93ff14.camel@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3aeed1ff9388f09555bf5c6ade03cbe9ce93ff14.camel@linux.ibm.com> On 2025-12-23 16:58:26, Mimi Zohar wrote: > Hi Chris, > > On Sun, 2025-12-21 at 12:01 -0600, Chris J Arges wrote: > > KASAN reported a stack-out-of-bounds access in ima_appraise_measurement > > from is_bprm_creds_for_exec: > > > > BUG: KASAN: stack-out-of-bounds in ima_appraise_measurement+0x12dc/0x16a0 > > Read of size 1 at addr ffffc9000160f940 by task sudo/550 > > The buggy address belongs to stack of task sudo/550 > > and is located at offset 24 in frame: > > ima_appraise_measurement+0x0/0x16a0 > > This frame has 2 objects: > > [48, 56) 'file' > > [80, 148) 'hash' > > > > This is caused by using container_of on the *file pointer. This offset > > calculation is what triggers the stack-out-of-bounds error. > > > > In order to fix this, pass in a bprm_is_check boolean which can be set > > depending on how process_measurement is called. If the caller has a > > linux_binprm pointer and the function is BPRM_CHECK we can determine > > is_check and set it then. Otherwise set it to false. > > > > Fixes: 95b3cdafd7cb7 ("ima: instantiate the bprm_creds_for_exec() hook") > > > > Signed-off-by: Chris J Arges > > Thank you! I'd appreciate your limiting the line lengths to 80 chars (e.g. > scripts/checkpatch.pl --max-line-length=80). > > -- > thanks, > > Mimi Sure thing, I'll make that adjustment and send v3. --chris