From: Arnd Bergmann <arnd@arndb.de> To: Russell King <linux@armlinux.org.uk>, Christoph Hellwig <hch@lst.de> Cc: Alexander Viro <viro@zeniv.linux.org.uk>, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, Arnd Bergmann <arnd@arndb.de> Subject: [PATCH v3 07/10] ARM: oabi-compat: rework fcntl64() emulation Date: Thu, 1 Oct 2020 16:12:30 +0200 [thread overview] Message-ID: <20201001141233.119343-8-arnd@arndb.de> (raw) In-Reply-To: <20201001141233.119343-1-arnd@arndb.de> This is one of the last users of get_fs(), and this is fairly easy to change, since the infrastructure for it is already there. The replacement here is essentially a copy of the existing fcntl64() syscall entry function. Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- arch/arm/kernel/sys_oabi-compat.c | 93 ++++++++++++++++++++----------- 1 file changed, 60 insertions(+), 33 deletions(-) diff --git a/arch/arm/kernel/sys_oabi-compat.c b/arch/arm/kernel/sys_oabi-compat.c index c3e63b73b6ae..3449e163ea88 100644 --- a/arch/arm/kernel/sys_oabi-compat.c +++ b/arch/arm/kernel/sys_oabi-compat.c @@ -194,56 +194,83 @@ struct oabi_flock64 { pid_t l_pid; } __attribute__ ((packed,aligned(4))); -static long do_locks(unsigned int fd, unsigned int cmd, - unsigned long arg) +static int get_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg) { - struct flock64 kernel; struct oabi_flock64 user; - mm_segment_t fs; - long ret; if (copy_from_user(&user, (struct oabi_flock64 __user *)arg, sizeof(user))) return -EFAULT; - kernel.l_type = user.l_type; - kernel.l_whence = user.l_whence; - kernel.l_start = user.l_start; - kernel.l_len = user.l_len; - kernel.l_pid = user.l_pid; - - fs = get_fs(); - set_fs(KERNEL_DS); - ret = sys_fcntl64(fd, cmd, (unsigned long)&kernel); - set_fs(fs); - - if (!ret && (cmd == F_GETLK64 || cmd == F_OFD_GETLK)) { - user.l_type = kernel.l_type; - user.l_whence = kernel.l_whence; - user.l_start = kernel.l_start; - user.l_len = kernel.l_len; - user.l_pid = kernel.l_pid; - if (copy_to_user((struct oabi_flock64 __user *)arg, - &user, sizeof(user))) - ret = -EFAULT; - } - return ret; + + kernel->l_type = user.l_type; + kernel->l_whence = user.l_whence; + kernel->l_start = user.l_start; + kernel->l_len = user.l_len; + kernel->l_pid = user.l_pid; + + return 0; +} + +static int put_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg) +{ + struct oabi_flock64 user; + + user.l_type = kernel->l_type; + user.l_whence = kernel->l_whence; + user.l_start = kernel->l_start; + user.l_len = kernel->l_len; + user.l_pid = kernel->l_pid; + + if (copy_to_user((struct oabi_flock64 __user *)arg, + &user, sizeof(user))) + return -EFAULT; + + return 0; } asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) { + void __user *argp = (void __user *)arg; + struct fd f = fdget_raw(fd); + struct flock64 flock; + long err = -EBADF; + + if (!f.file) + goto out; + switch (cmd) { - case F_OFD_GETLK: - case F_OFD_SETLK: - case F_OFD_SETLKW: case F_GETLK64: + case F_OFD_GETLK: + err = security_file_fcntl(f.file, cmd, arg); + if (err) + break; + err = get_oabi_flock(&flock, argp); + if (err) + break; + err = fcntl_getlk64(f.file, cmd, &flock); + if (!err) + err = put_oabi_flock(&flock, argp); + break; case F_SETLK64: case F_SETLKW64: - return do_locks(fd, cmd, arg); - + case F_OFD_SETLK: + case F_OFD_SETLKW: + err = security_file_fcntl(f.file, cmd, arg); + if (err) + break; + err = get_oabi_flock(&flock, argp); + if (err) + break; + err = fcntl_setlk64(fd, f.file, cmd, &flock); + break; default: - return sys_fcntl64(fd, cmd, arg); + err = sys_fcntl64(fd, cmd, arg); + break; } + fdput(f); +out: + return err; } struct oabi_epoll_event { -- 2.27.0
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de> To: Russell King <linux@armlinux.org.uk>, Christoph Hellwig <hch@lst.de> Cc: linux-arch@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Alexander Viro <viro@zeniv.linux.org.uk>, linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 07/10] ARM: oabi-compat: rework fcntl64() emulation Date: Thu, 1 Oct 2020 16:12:30 +0200 [thread overview] Message-ID: <20201001141233.119343-8-arnd@arndb.de> (raw) In-Reply-To: <20201001141233.119343-1-arnd@arndb.de> This is one of the last users of get_fs(), and this is fairly easy to change, since the infrastructure for it is already there. The replacement here is essentially a copy of the existing fcntl64() syscall entry function. Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- arch/arm/kernel/sys_oabi-compat.c | 93 ++++++++++++++++++++----------- 1 file changed, 60 insertions(+), 33 deletions(-) diff --git a/arch/arm/kernel/sys_oabi-compat.c b/arch/arm/kernel/sys_oabi-compat.c index c3e63b73b6ae..3449e163ea88 100644 --- a/arch/arm/kernel/sys_oabi-compat.c +++ b/arch/arm/kernel/sys_oabi-compat.c @@ -194,56 +194,83 @@ struct oabi_flock64 { pid_t l_pid; } __attribute__ ((packed,aligned(4))); -static long do_locks(unsigned int fd, unsigned int cmd, - unsigned long arg) +static int get_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg) { - struct flock64 kernel; struct oabi_flock64 user; - mm_segment_t fs; - long ret; if (copy_from_user(&user, (struct oabi_flock64 __user *)arg, sizeof(user))) return -EFAULT; - kernel.l_type = user.l_type; - kernel.l_whence = user.l_whence; - kernel.l_start = user.l_start; - kernel.l_len = user.l_len; - kernel.l_pid = user.l_pid; - - fs = get_fs(); - set_fs(KERNEL_DS); - ret = sys_fcntl64(fd, cmd, (unsigned long)&kernel); - set_fs(fs); - - if (!ret && (cmd == F_GETLK64 || cmd == F_OFD_GETLK)) { - user.l_type = kernel.l_type; - user.l_whence = kernel.l_whence; - user.l_start = kernel.l_start; - user.l_len = kernel.l_len; - user.l_pid = kernel.l_pid; - if (copy_to_user((struct oabi_flock64 __user *)arg, - &user, sizeof(user))) - ret = -EFAULT; - } - return ret; + + kernel->l_type = user.l_type; + kernel->l_whence = user.l_whence; + kernel->l_start = user.l_start; + kernel->l_len = user.l_len; + kernel->l_pid = user.l_pid; + + return 0; +} + +static int put_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg) +{ + struct oabi_flock64 user; + + user.l_type = kernel->l_type; + user.l_whence = kernel->l_whence; + user.l_start = kernel->l_start; + user.l_len = kernel->l_len; + user.l_pid = kernel->l_pid; + + if (copy_to_user((struct oabi_flock64 __user *)arg, + &user, sizeof(user))) + return -EFAULT; + + return 0; } asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) { + void __user *argp = (void __user *)arg; + struct fd f = fdget_raw(fd); + struct flock64 flock; + long err = -EBADF; + + if (!f.file) + goto out; + switch (cmd) { - case F_OFD_GETLK: - case F_OFD_SETLK: - case F_OFD_SETLKW: case F_GETLK64: + case F_OFD_GETLK: + err = security_file_fcntl(f.file, cmd, arg); + if (err) + break; + err = get_oabi_flock(&flock, argp); + if (err) + break; + err = fcntl_getlk64(f.file, cmd, &flock); + if (!err) + err = put_oabi_flock(&flock, argp); + break; case F_SETLK64: case F_SETLKW64: - return do_locks(fd, cmd, arg); - + case F_OFD_SETLK: + case F_OFD_SETLKW: + err = security_file_fcntl(f.file, cmd, arg); + if (err) + break; + err = get_oabi_flock(&flock, argp); + if (err) + break; + err = fcntl_setlk64(fd, f.file, cmd, &flock); + break; default: - return sys_fcntl64(fd, cmd, arg); + err = sys_fcntl64(fd, cmd, arg); + break; } + fdput(f); +out: + return err; } struct oabi_epoll_event { -- 2.27.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-10-01 14:13 UTC|newest] Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-10-01 14:12 [PATCH v3 00/10] ARM: remove set_fs callers and implementation Arnd Bergmann 2020-10-01 14:12 ` Arnd Bergmann 2020-10-01 14:12 ` [PATCH v3 01/10] mm/maccess: fix unaligned copy_{from,to}_kernel_nofault Arnd Bergmann 2020-10-01 14:12 ` [PATCH v3 01/10] mm/maccess: fix unaligned copy_{from, to}_kernel_nofault Arnd Bergmann 2020-10-01 14:12 ` [PATCH v3 02/10] ARM: traps: use get_kernel_nofault instead of set_fs() Arnd Bergmann 2020-10-01 14:12 ` Arnd Bergmann 2020-10-01 14:12 ` [PATCH v3 03/10] ARM: oabi-compat: add epoll_pwait handler Arnd Bergmann 2020-10-01 14:12 ` Arnd Bergmann 2020-10-01 14:12 ` [PATCH v3 04/10] ARM: syscall: always store thread_info->syscall Arnd Bergmann 2020-10-01 14:12 ` Arnd Bergmann 2020-10-01 14:12 ` [PATCH v3 05/10] ARM: oabi-compat: rework epoll_wait/epoll_pwait emulation Arnd Bergmann 2020-10-01 14:12 ` Arnd Bergmann 2020-10-01 14:12 ` [PATCH v3 06/10] ARM: oabi-compat: rework sys_semtimedop emulation Arnd Bergmann 2020-10-01 14:12 ` Arnd Bergmann 2020-10-02 19:46 ` kernel test robot 2020-10-01 14:12 ` Arnd Bergmann [this message] 2020-10-01 14:12 ` [PATCH v3 07/10] ARM: oabi-compat: rework fcntl64() emulation Arnd Bergmann 2020-10-01 14:12 ` [PATCH v3 08/10] ARM: uaccess: add __{get,put}_kernel_nofault Arnd Bergmann 2020-10-01 14:12 ` Arnd Bergmann 2020-10-01 14:12 ` [PATCH v3 09/10] ARM: provide a TASK_SIZE_MAX definition Arnd Bergmann 2020-10-01 14:12 ` Arnd Bergmann 2020-10-01 14:12 ` [PATCH v3 10/10] ARM: uaccess: remove set_fs() implementation Arnd Bergmann 2020-10-01 14:12 ` Arnd Bergmann
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