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Message-ID: <1120e8fd-2f48-5b1f-7072-9bd8e2b82fbf@gmail.com> Date: Tue, 6 Mar 2018 09:05:00 -0800 From: J Freyensee <why2jjj.linux@...il.com> To: Igor Stoppa <igor.stoppa@...wei.com>, david@...morbit.com, willy@...radead.org, keescook@...omium.org, mhocko@...nel.org Cc: labbott@...hat.com, linux-security-module@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com Subject: Re: [PATCH 6/7] lkdtm: crash on overwriting protected pmalloc var > > +#ifdef CONFIG_PROTECTABLE_MEMORY > +void lkdtm_WRITE_RO_PMALLOC(void) > +{ > + struct gen_pool *pool; > + int *i; > + > + pool = pmalloc_create_pool("pool", 0); > + if (unlikely(!pool)) { > + pr_info("Failed preparing pool for pmalloc test."); > + return; > + } > + > + i = (int *)pmalloc(pool, sizeof(int), GFP_KERNEL); > + if (unlikely(!i)) { > + pr_info("Failed allocating memory for pmalloc test."); > + pmalloc_destroy_pool(pool); > + return; > + } > + > + *i = INT_MAX; > + pmalloc_protect_pool(pool); > + > + pr_info("attempting bad pmalloc write at %p\n", i); > + *i = 0; Seems harmless, but I don't get why *i local variable needs to be set to 0 at the end of this function. Otherwise, Reviewed-by: Jay Freyensee <why2jjj.linux@...il.com>
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