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Riedl" To: linuxppc-dev@lists.ozlabs.org Cc: tglx@linutronix.de, x86@kernel.org, linux-hardening@vger.kernel.org, keescook@chromium.org, npiggin@gmail.com, dja@axtens.net, peterz@infradead.org Subject: [PATCH v5 4/8] lkdtm/x86_64: Add test to hijack a patch mapping Date: Tue, 13 Jul 2021 00:31:09 -0500 Message-Id: <20210713053113.4632-5-cmr@linux.ibm.com> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20210713053113.4632-1-cmr@linux.ibm.com> References: <20210713053113.4632-1-cmr@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: pCCKxfVjoj7mFUp7bu2RIzF3Q4m8S6El X-Proofpoint-ORIG-GUID: QDtJ03sGPYCLaSQlGDX7uPxx0-suv1Hs X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-07-13_03:2021-07-13,2021-07-12 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 clxscore=1015 spamscore=0 malwarescore=0 suspectscore=0 impostorscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107130026 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org A previous commit implemented an LKDTM test on powerpc to exploit the temporary mapping established when patching code with STRICT_KERNEL_RWX enabled. Extend the test to work on x86_64 as well. Signed-off-by: Christopher M. Riedl --- drivers/misc/lkdtm/perms.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/misc/lkdtm/perms.c b/drivers/misc/lkdtm/perms.c index 39e7456852229..41e87e5f9cc86 100644 --- a/drivers/misc/lkdtm/perms.c +++ b/drivers/misc/lkdtm/perms.c @@ -224,7 +224,7 @@ void lkdtm_ACCESS_NULL(void) } =20 #if (IS_BUILTIN(CONFIG_LKDTM) && defined(CONFIG_STRICT_KERNEL_RWX) && \ - defined(CONFIG_PPC)) + (defined(CONFIG_PPC) || defined(CONFIG_X86_64))) /* * This is just a dummy location to patch-over. */ @@ -233,12 +233,25 @@ static void patching_target(void) return; } =20 -#include const u32 *patch_site =3D (const u32 *)&patching_target; =20 +#ifdef CONFIG_PPC +#include +#endif + +#ifdef CONFIG_X86_64 +#include +#endif + static inline int lkdtm_do_patch(u32 data) { +#ifdef CONFIG_PPC return patch_instruction((u32 *)patch_site, ppc_inst(data)); +#endif +#ifdef CONFIG_X86_64 + text_poke((void *)patch_site, &data, sizeof(u32)); + return 0; +#endif } =20 static inline u32 lkdtm_read_patch_site(void) @@ -249,11 +262,16 @@ static inline u32 lkdtm_read_patch_site(void) /* Returns True if the write succeeds */ static inline bool lkdtm_try_write(u32 data, u32 *addr) { +#ifdef CONFIG_PPC __put_kernel_nofault(addr, &data, u32, err); return true; =20 err: return false; +#endif +#ifdef CONFIG_X86_64 + return !__put_user(data, addr); +#endif } =20 static int lkdtm_patching_cpu(void *data) @@ -346,8 +364,8 @@ void lkdtm_HIJACK_PATCH(void) =20 void lkdtm_HIJACK_PATCH(void) { - if (!IS_ENABLED(CONFIG_PPC)) - pr_err("XFAIL: this test only runs on powerpc\n"); + if (!IS_ENABLED(CONFIG_PPC) && !IS_ENABLED(CONFIG_X86_64)) + pr_err("XFAIL: this test only runs on powerpc and x86_64\n"); if (!IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) pr_err("XFAIL: this test requires CONFIG_STRICT_KERNEL_RWX\n"); if (!IS_BUILTIN(CONFIG_LKDTM)) --=20 2.26.1