From 4faea239e529d1d6b3b93fbf08d5e90427961a41 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 17 Apr 2018 12:03:19 +0200 Subject: [PATCH] y2038: utimes: Rework #ifdef guards for compat syscalls After changing over to 64-bit time_t syscalls, many architectures will want compat_sys_utimensat() but not respective handlers for utime(), utimes() and futimesat(). This adds a new __ARCH_WANT_SYS_UTIME32 to complement __ARCH_WANT_SYS_UTIME. For now, all 64-bit architectures that support CONFIG_COMPAT set it, but future 64-bit architectures will not (tile would not have needed it either, but got removed). As older 32-bit architectures get converted to using CONFIG_64BIT_TIME, they will have to use __ARCH_WANT_SYS_UTIME32 instead of __ARCH_WANT_SYS_UTIME. Architectures using the generic syscall ABI don't need either of them as they never had a utime syscall. Since the compat_utimbuf structure is now required outside of CONFIG_COMPAT, I'm moving it into compat_time.h. Signed-off-by: Arnd Bergmann --- changed from last version: - renamed __ARCH_WANT_COMPAT_SYS_UTIME to __ARCH_WANT_SYS_UTIME32 --- arch/arm64/include/asm/unistd.h | 1 + arch/mips/include/asm/unistd.h | 1 + arch/parisc/include/asm/unistd.h | 1 + arch/powerpc/include/asm/unistd.h | 1 + arch/s390/include/asm/unistd.h | 1 + arch/sparc/include/asm/unistd.h | 1 + arch/x86/include/asm/unistd.h | 1 + fs/utimes.c | 8 ++++++-- include/linux/compat.h | 7 +------ include/linux/time32.h | 5 +++++ 10 files changed, 19 insertions(+), 8 deletions(-) diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h index 2af308f..b13ca091 100644 --- a/arch/arm64/include/asm/unistd.h +++ b/arch/arm64/include/asm/unistd.h @@ -22,6 +22,7 @@ #define __ARCH_WANT_SYS_SIGPENDING #define __ARCH_WANT_SYS_SIGPROCMASK #define __ARCH_WANT_COMPAT_SYS_SENDFILE +#define __ARCH_WANT_SYS_UTIME32 #define __ARCH_WANT_SYS_FORK #define __ARCH_WANT_SYS_VFORK diff --git a/arch/mips/include/asm/unistd.h b/arch/mips/include/asm/unistd.h index c2174b8..c68b8ae 100644 --- a/arch/mips/include/asm/unistd.h +++ b/arch/mips/include/asm/unistd.h @@ -31,6 +31,7 @@ #define __ARCH_WANT_SYS_IPC #define __ARCH_WANT_SYS_PAUSE #define __ARCH_WANT_SYS_UTIME +#define __ARCH_WANT_SYS_UTIME32 #define __ARCH_WANT_SYS_WAITPID #define __ARCH_WANT_SYS_SOCKETCALL #define __ARCH_WANT_SYS_GETPGRP diff --git a/arch/parisc/include/asm/unistd.h b/arch/parisc/include/asm/unistd.h index a0c3837..bc37a49 100644 --- a/arch/parisc/include/asm/unistd.h +++ b/arch/parisc/include/asm/unistd.h @@ -152,6 +152,7 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) \ #define __ARCH_WANT_COMPAT_SYS_TIME #define __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL #define __ARCH_WANT_SYS_UTIME +#define __ARCH_WANT_SYS_UTIME32 #define __ARCH_WANT_SYS_WAITPID #define __ARCH_WANT_SYS_SOCKETCALL #define __ARCH_WANT_SYS_FADVISE64 diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h index 9326c91..b0de85b 100644 --- a/arch/powerpc/include/asm/unistd.h +++ b/arch/powerpc/include/asm/unistd.h @@ -47,6 +47,7 @@ #endif #ifdef CONFIG_PPC64 #define __ARCH_WANT_COMPAT_SYS_TIME +#define __ARCH_WANT_SYS_UTIME32 #define __ARCH_WANT_SYS_NEWFSTATAT #define __ARCH_WANT_COMPAT_SYS_SENDFILE #endif diff --git a/arch/s390/include/asm/unistd.h b/arch/s390/include/asm/unistd.h index a2d583e..a1fbf15 100644 --- a/arch/s390/include/asm/unistd.h +++ b/arch/s390/include/asm/unistd.h @@ -34,6 +34,7 @@ #define __ARCH_WANT_SYS_SIGPROCMASK # ifdef CONFIG_COMPAT # define __ARCH_WANT_COMPAT_SYS_TIME +# define __ARCH_WANT_SYS_UTIME32 # endif #define __ARCH_WANT_SYS_FORK #define __ARCH_WANT_SYS_VFORK diff --git a/arch/sparc/include/asm/unistd.h b/arch/sparc/include/asm/unistd.h index f7514d3..00f87db 100644 --- a/arch/sparc/include/asm/unistd.h +++ b/arch/sparc/include/asm/unistd.h @@ -42,6 +42,7 @@ #define __ARCH_WANT_SYS_IPC #else #define __ARCH_WANT_COMPAT_SYS_TIME +#define __ARCH_WANT_SYS_UTIME32 #define __ARCH_WANT_COMPAT_SYS_SENDFILE #endif diff --git a/arch/x86/include/asm/unistd.h b/arch/x86/include/asm/unistd.h index 153d2a5..dc4ed8b 100644 --- a/arch/x86/include/asm/unistd.h +++ b/arch/x86/include/asm/unistd.h @@ -24,6 +24,7 @@ # include # include # define __ARCH_WANT_COMPAT_SYS_TIME +# define __ARCH_WANT_SYS_UTIME32 # define __ARCH_WANT_COMPAT_SYS_PREADV64 # define __ARCH_WANT_COMPAT_SYS_PWRITEV64 # define __ARCH_WANT_COMPAT_SYS_PREADV64V2 diff --git a/fs/utimes.c b/fs/utimes.c index 2f6f080..bdcf2da 100644 --- a/fs/utimes.c +++ b/fs/utimes.c @@ -218,13 +218,14 @@ SYSCALL_DEFINE2(utime, char __user *, filename, struct utimbuf __user *, times) } #endif -#ifdef CONFIG_COMPAT +#ifdef CONFIG_COMPAT_32BIT_TIME /* * Not all architectures have sys_utime, so implement this in terms * of sys_utimes. */ +#ifdef __ARCH_WANT_SYS_UTIME32 COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename, - struct compat_utimbuf __user *, t) + struct old_utimbuf32 __user *, t) { struct timespec64 tv[2]; @@ -237,6 +238,7 @@ COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename, } return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0); } +#endif COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct old_timespec32 __user *, t, int, flags) { @@ -253,6 +255,7 @@ COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filena return do_utimes(dfd, filename, t ? tv : NULL, flags); } +#ifdef __ARCH_WANT_SYS_UTIME32 static long do_compat_futimesat(unsigned int dfd, const char __user *filename, struct old_timeval32 __user *t) { @@ -285,3 +288,4 @@ COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct old_timeval return do_compat_futimesat(AT_FDCWD, filename, t); } #endif +#endif diff --git a/include/linux/compat.h b/include/linux/compat.h index d376fa8..6fb5abd 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -113,11 +113,6 @@ typedef __compat_gid32_t compat_gid_t; struct compat_sel_arg_struct; struct rusage; -struct compat_utimbuf { - old_time32_t actime; - old_time32_t modtime; -}; - struct compat_itimerval { struct old_timeval32 it_interval; struct old_timeval32 it_value; @@ -942,7 +937,7 @@ asmlinkage long compat_sys_newlstat(const char __user *filename, /* __ARCH_WANT_SYSCALL_DEPRECATED */ asmlinkage long compat_sys_time(old_time32_t __user *tloc); asmlinkage long compat_sys_utime(const char __user *filename, - struct compat_utimbuf __user *t); + struct old_utimbuf32 __user *t); asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct old_timeval32 __user *t); diff --git a/include/linux/time32.h b/include/linux/time32.h index 0e0d730..61904a6 100644 --- a/include/linux/time32.h +++ b/include/linux/time32.h @@ -30,6 +30,11 @@ struct old_itimerspec32 { struct old_timespec32 it_value; }; +struct old_utimbuf32 { + old_time32_t actime; + old_time32_t modtime; +}; + extern int get_old_timespec32(struct timespec64 *, const void __user *); extern int put_old_timespec32(const struct timespec64 *, void __user *); extern int get_old_itimerspec32(struct itimerspec64 *its, -- 2.7.4