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Riedl" To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v5 8/8] lkdtm/powerpc: Fix code patching hijack test Date: Tue, 13 Jul 2021 00:31:13 -0500 Message-Id: <20210713053113.4632-9-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 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: cHCthgBcM9xp9Mt9bos8xwQ5FL3n-jCp X-Proofpoint-ORIG-GUID: HDbwSKEE2EoyOQh_byeJIz2jcHRRf7Jr 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 phishscore=0 adultscore=0 suspectscore=0 impostorscore=0 clxscore=1015 lowpriorityscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 mlxlogscore=999 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107130022 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: keescook@chromium.org, peterz@infradead.org, x86@kernel.org, npiggin@gmail.com, linux-hardening@vger.kernel.org, tglx@linutronix.de, dja@axtens.net Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Code patching on powerpc with a STRICT_KERNEL_RWX uses a userspace address in a temporary mm on Radix now. Use __put_user() to avoid write failures due to KUAP when attempting a "hijack" on the patching address. __put_user() also works with the non-userspace, vmalloc-based patching address on non-Radix MMUs. Signed-off-by: Christopher M. Riedl --- drivers/misc/lkdtm/perms.c | 9 --------- 1 file changed, 9 deletions(-) diff --git a/drivers/misc/lkdtm/perms.c b/drivers/misc/lkdtm/perms.c index 41e87e5f9cc86..da6a34a0a49fb 100644 --- a/drivers/misc/lkdtm/perms.c +++ b/drivers/misc/lkdtm/perms.c @@ -262,16 +262,7 @@ 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; - -err: - return false; -#endif -#ifdef CONFIG_X86_64 return !__put_user(data, addr); -#endif } static int lkdtm_patching_cpu(void *data)