From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg1-f195.google.com ([209.85.215.195]:34459 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731390AbeITKei (ORCPT ); Thu, 20 Sep 2018 06:34:38 -0400 From: Deepa Dinamani To: viro@zeniv.linux.org.uk, tglx@linutronix.de, linux-kernel@vger.kernel.org Cc: arnd@arndb.de, y2038@lists.linaro.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, linux-aio@kvack.org Subject: [PATCH v4 5/5] io_pgetevents: use __kernel_timespec Date: Wed, 19 Sep 2018 21:41:08 -0700 Message-Id: <20180920044108.6606-6-deepa.kernel@gmail.com> In-Reply-To: <20180920044108.6606-1-deepa.kernel@gmail.com> References: <20180920044108.6606-1-deepa.kernel@gmail.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: struct timespec is not y2038 safe. struct __kernel_timespec is the new y2038 safe structure for all syscalls that are using struct timespec. Update io_pgetevents interfaces to use struct __kernel_timespec. sigset_t also has different representations on 32 bit and 64 bit architectures. Hence, we need to support the following different syscalls: New y2038 safe syscalls: (Controlled by CONFIG_64BIT_TIME for 32 bit ABIs) Native 64 bit(unchanged) and native 32 bit : sys_io_pgetevents Compat : compat_sys_io_pgetevents_time64 Older y2038 unsafe syscalls: (Controlled by CONFIG_32BIT_COMPAT_TIME for 32 bit ABIs) Native 32 bit : sys_io_pgetevents_time32 Compat : compat_sys_io_pgetevents Note that io_getevents syscalls do not have a y2038 safe solution. Signed-off-by: Deepa Dinamani --- fs/aio.c | 84 ++++++++++++++++++++++++++++++++++++++-- include/linux/compat.h | 6 +++ include/linux/syscalls.h | 10 ++++- 3 files changed, 95 insertions(+), 5 deletions(-) diff --git a/fs/aio.c b/fs/aio.c index b81c216534d6..5caf31455f90 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -2063,11 +2063,13 @@ static long do_io_getevents(aio_context_t ctx_id, * specifies an infinite timeout. Note that the timeout pointed to by * timeout is relative. Will fail with -ENOSYS if not implemented. */ +#if !defined(CONFIG_64BIT_TIME) || defined(CONFIG_64BIT) + SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id, long, min_nr, long, nr, struct io_event __user *, events, - struct timespec __user *, timeout) + struct __kernel_timespec __user *, timeout) { struct timespec64 ts; int ret; @@ -2081,6 +2083,8 @@ SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id, return ret; } +#endif + struct __aio_sigset { const sigset_t __user *sigmask; size_t sigsetsize; @@ -2091,7 +2095,7 @@ SYSCALL_DEFINE6(io_pgetevents, long, min_nr, long, nr, struct io_event __user *, events, - struct timespec __user *, timeout, + struct __kernel_timespec __user *, timeout, const struct __aio_sigset __user *, usig) { struct __aio_sigset ksig = { NULL, }; @@ -2105,6 +2109,39 @@ SYSCALL_DEFINE6(io_pgetevents, if (usig && copy_from_user(&ksig, usig, sizeof(ksig))) return -EFAULT; + ret = set_user_sigmask(ksig.sigmask, &ksigmask, &sigsaved, ksig.sigsetsize); + if (ret) + return ret; + + ret = do_io_getevents(ctx_id, min_nr, nr, events, timeout ? &ts : NULL); + restore_user_sigmask(ksig.sigmask, &sigsaved); + if (signal_pending(current) && !ret) + ret = -ERESTARTNOHAND; + + return ret; +} + +#if defined(CONFIG_COMPAT_32BIT_TIME) && !defined(CONFIG_64BIT) + +SYSCALL_DEFINE6(io_pgetevents_time32, + aio_context_t, ctx_id, + long, min_nr, + long, nr, + struct io_event __user *, events, + struct old_timespec32 __user *, timeout, + const struct __aio_sigset __user *, usig) +{ + struct __aio_sigset ksig = { NULL, }; + sigset_t ksigmask, sigsaved; + struct timespec64 ts; + int ret; + + if (timeout && unlikely(get_old_timespec32(&ts, timeout))) + return -EFAULT; + + if (usig && copy_from_user(&ksig, usig, sizeof(ksig))) + return -EFAULT; + ret = set_user_sigmask(ksig.sigmask, &ksigmask, &sigsaved, ksig.sigsetsize); if (ret) @@ -2118,7 +2155,10 @@ SYSCALL_DEFINE6(io_pgetevents, return ret; } -#ifdef CONFIG_COMPAT +#endif + +#if defined(CONFIG_COMPAT_32BIT_TIME) + COMPAT_SYSCALL_DEFINE5(io_getevents, compat_aio_context_t, ctx_id, compat_long_t, min_nr, compat_long_t, nr, @@ -2137,12 +2177,17 @@ COMPAT_SYSCALL_DEFINE5(io_getevents, compat_aio_context_t, ctx_id, return ret; } +#endif + +#ifdef CONFIG_COMPAT struct __compat_aio_sigset { compat_sigset_t __user *sigmask; compat_size_t sigsetsize; }; +#if defined(CONFIG_COMPAT_32BIT_TIME) + COMPAT_SYSCALL_DEFINE6(io_pgetevents, compat_aio_context_t, ctx_id, compat_long_t, min_nr, @@ -2173,4 +2218,37 @@ COMPAT_SYSCALL_DEFINE6(io_pgetevents, return ret; } + +#endif + +COMPAT_SYSCALL_DEFINE6(io_pgetevents_time64, + compat_aio_context_t, ctx_id, + compat_long_t, min_nr, + compat_long_t, nr, + struct io_event __user *, events, + struct __kernel_timespec __user *, timeout, + const struct __compat_aio_sigset __user *, usig) +{ + struct __compat_aio_sigset ksig = { NULL, }; + sigset_t ksigmask, sigsaved; + struct timespec64 t; + int ret; + + if (timeout && get_timespec64(&t, timeout)) + return -EFAULT; + + if (usig && copy_from_user(&ksig, usig, sizeof(ksig))) + return -EFAULT; + + ret = set_compat_user_sigmask(ksig.sigmask, &ksigmask, &sigsaved, ksig.sigsetsize); + if (ret) + return ret; + + ret = do_io_getevents(ctx_id, min_nr, nr, events, timeout ? &t : NULL); + restore_user_sigmask(ksig.sigmask, &sigsaved); + if (signal_pending(current) && !ret) + ret = -ERESTARTNOHAND; + + return ret; +} #endif diff --git a/include/linux/compat.h b/include/linux/compat.h index 6896e6e51c00..50cd0329c8bf 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -556,6 +556,12 @@ asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id, struct io_event __user *events, struct old_timespec32 __user *timeout, const struct __compat_aio_sigset __user *usig); +asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id, + compat_long_t min_nr, + compat_long_t nr, + struct io_event __user *events, + struct __kernel_timespec __user *timeout, + const struct __compat_aio_sigset __user *usig); /* fs/cookies.c */ asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t); diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index e9cd0409c3fe..3ff0e29c082c 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -297,12 +297,18 @@ asmlinkage long sys_io_getevents(aio_context_t ctx_id, long min_nr, long nr, struct io_event __user *events, - struct timespec __user *timeout); + struct __kernel_timespec __user *timeout); asmlinkage long sys_io_pgetevents(aio_context_t ctx_id, long min_nr, long nr, struct io_event __user *events, - struct timespec __user *timeout, + struct __kernel_timespec __user *timeout, + const struct __aio_sigset *sig); +asmlinkage long sys_io_pgetevents_time32(aio_context_t ctx_id, + long min_nr, + long nr, + struct io_event __user *events, + struct old_timespec32 __user *timeout, const struct __aio_sigset *sig); /* fs/xattr.c */ -- 2.17.1