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Mon, 19 Jun 2017 15:53:42 +0000 From: Yury Norov To: Catalin Marinas , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 18/20] arm64: ptrace: handle ptrace_request differently for aarch32 and ilp32 Date: Mon, 19 Jun 2017 18:50:01 +0300 Message-Id: <20170619155003.13218-19-ynorov@caviumnetworks.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170619155003.13218-1-ynorov@caviumnetworks.com> References: <20170619155003.13218-1-ynorov@caviumnetworks.com> MIME-Version: 1.0 X-Originating-IP: [85.253.137.34] X-ClientProxiedBy: VI1P190CA0030.EURP190.PROD.OUTLOOK.COM (10.165.188.171) To CY1PR0701MB1866.namprd07.prod.outlook.com (10.163.42.20) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 44c13d53-11c5-4cc1-9a6f-08d4b72b5c5e X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(22001)(201703131423075)(201703031133081); SRVR:CY1PR0701MB1866; X-Microsoft-Exchange-Diagnostics: 1; CY1PR0701MB1866; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: szabolcs.nagy@arm.com, Heiko Carstens , Chris Metcalf , Yury Norov , philipp.tomsich@theobroma-systems.com, Joseph Myers , zhouchengming1@huawei.com, Steve Ellcey , Prasun.Kapoor@caviumnetworks.com, Andreas Schwab , Alexander Graf , Geert Uytterhoeven , Adam Borowski , manuel.montezelo@gmail.com, James Hogan , Chris Metcalf , Andrew Pinski , linyongting@huawei.com, Alexey Klimov , Mark Brown , Bamvor Zhangjian , Bamvor Jian Zhang , Maxim Kuvyrkov , Florian Weimer , Nathan_Lynch@mentor.com, James Morse , Ramana Radhakrishnan , schwidefsky@de.ibm.com, davem@davemloft.net, christoph.muellner@theobroma-systems.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP ILP32 has context-related structures different from both aarch32 and aarch64/lp64. In this patch compat_arch_ptrace() renamed to compat_a32_ptrace(), and compat_arch_ptrace() only makes choice between compat_a32_ptrace() and new compat_ilp32_ptrace() handler. compat_ilp32_ptrace() calls generic compat_ptrace_request() for all requests except PTRACE_GETSIGMASK and PTRACE_SETSIGMASK, which need special handling. Signed-off-by: Yury Norov Signed-off-by: Bamvor Jian Zhang Signed-off-by: Chengming Zhou --- arch/arm64/kernel/ptrace.c | 65 ++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 63 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index e2b7c040bf84..28f96765e8cc 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -765,9 +765,11 @@ static const struct user_regset_view user_aarch64_view = { .regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets) }; -#ifdef CONFIG_AARCH32_EL0 +#ifdef CONFIG_COMPAT #include +#endif +#ifdef CONFIG_AARCH32_EL0 enum compat_regset { REGSET_COMPAT_GPR, REGSET_COMPAT_VFP, @@ -1223,7 +1225,7 @@ static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num, } #endif /* CONFIG_HAVE_HW_BREAKPOINT */ -long compat_arch_ptrace(struct task_struct *child, compat_long_t request, +static long compat_a32_ptrace(struct task_struct *child, compat_long_t request, compat_ulong_t caddr, compat_ulong_t cdata) { unsigned long addr = caddr; @@ -1300,8 +1302,67 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request, return ret; } + +#else +#define compat_a32_ptrace(child, request, caddr, cdata) (0) #endif /* CONFIG_AARCH32_EL0 */ +#ifdef CONFIG_ARM64_ILP32 +#include + +static long compat_ilp32_ptrace(struct task_struct *child, compat_long_t request, + compat_ulong_t caddr, compat_ulong_t cdata) +{ + sigset_t new_set; + + switch (request) { + case PTRACE_GETSIGMASK: + if (caddr != sizeof(compat_sigset_t)) + return -EINVAL; + + return put_sigset_t((compat_sigset_t __user *) (u64) cdata, + &child->blocked); + + case PTRACE_SETSIGMASK: + if (caddr != sizeof(compat_sigset_t)) + return -EINVAL; + + if (get_sigset_t(&new_set, (compat_sigset_t __user *) (u64) cdata)) + return -EFAULT; + + sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP)); + + /* + * Every thread does recalc_sigpending() after resume, so + * retarget_shared_pending() and recalc_sigpending() are not + * called here. + */ + spin_lock_irq(&child->sighand->siglock); + child->blocked = new_set; + spin_unlock_irq(&child->sighand->siglock); + + return 0; + + default: + return compat_ptrace_request(child, request, caddr, cdata); + } +} + +#else +#define compat_ilp32_ptrace(child, request, caddr, cdata) (0) +#endif + +#ifdef CONFIG_COMPAT +long compat_arch_ptrace(struct task_struct *child, compat_long_t request, + compat_ulong_t caddr, compat_ulong_t cdata) +{ + if (is_a32_compat_task()) + return compat_a32_ptrace(child, request, caddr, cdata); + + return compat_ilp32_ptrace(child, request, caddr, cdata); +} +#endif + const struct user_regset_view *task_user_regset_view(struct task_struct *task) { #ifdef CONFIG_AARCH32_EL0