[v2,08/17] y2038: utimes: Rework #ifdef guards for compat syscalls

Message ID 20180716161103.16239-9-arnd@arndb.de
State New
Headers show
Series
  • y2038: system calls, part 3
Related show

Commit Message

Arnd Bergmann July 16, 2018, 4:10 p.m.
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_COMPAT_SYS_UTIME
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_COMPAT_SYS_UTIME 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 <arnd@arndb.de>

---
If we proceed with Christoph's suggestion of renaming all the compat
time handling to something that doesn't have compat in the name,
the new macro here would have to get renamed as well.
---
 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                       | 6 +++++-
 include/linux/compat.h            | 5 -----
 include/linux/compat_time.h       | 5 +++++
 10 files changed, 17 insertions(+), 6 deletions(-)

-- 
2.9.0

Patch

diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
index 2af308f13463..17f2211e20f2 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_COMPAT_SYS_UTIME
 #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 c2174b80e50e..f47058485f7f 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_COMPAT_SYS_UTIME
 #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 a0c38374fff0..62ffafda0d50 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_COMPAT_SYS_UTIME
 #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 9326c9133516..51e56d85815a 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_COMPAT_SYS_UTIME
 #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 a2d583ea526d..b4ba7781d396 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_COMPAT_SYS_UTIME
 # 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 f7514d3eae7b..610f6a8a14de 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_COMPAT_SYS_UTIME
 #define __ARCH_WANT_COMPAT_SYS_SENDFILE
 #endif
 
diff --git a/arch/x86/include/asm/unistd.h b/arch/x86/include/asm/unistd.h
index 153d2a5e6b02..7d784b8bceb4 100644
--- a/arch/x86/include/asm/unistd.h
+++ b/arch/x86/include/asm/unistd.h
@@ -24,6 +24,7 @@ 
 #  include <asm/unistd_64.h>
 #  include <asm/unistd_64_x32.h>
 #  define __ARCH_WANT_COMPAT_SYS_TIME
+#  define __ARCH_WANT_COMPAT_SYS_UTIME
 #  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 ebc7fb713d91..6318443de15d 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -218,11 +218,12 @@  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_COMPAT_SYS_UTIME
 COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename,
 		       struct compat_utimbuf __user *, t)
 {
@@ -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 compat_timespec __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_COMPAT_SYS_UTIME
 static long do_compat_futimesat(unsigned int dfd, const char __user *filename,
 				struct compat_timeval __user *t)
 {
@@ -285,3 +288,4 @@  COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_time
 	return do_compat_futimesat(AT_FDCWD, filename, t);
 }
 #endif
+#endif
diff --git a/include/linux/compat.h b/include/linux/compat.h
index c40bc39fe05f..ab0b1f48dc5b 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 {
-	compat_time_t		actime;
-	compat_time_t		modtime;
-};
-
 struct compat_itimerval {
 	struct compat_timeval	it_interval;
 	struct compat_timeval	it_value;
diff --git a/include/linux/compat_time.h b/include/linux/compat_time.h
index e70bfd1d2c3f..df1b2c638f32 100644
--- a/include/linux/compat_time.h
+++ b/include/linux/compat_time.h
@@ -22,6 +22,11 @@  struct compat_itimerspec {
 	struct compat_timespec it_value;
 };
 
+struct compat_utimbuf {
+	compat_time_t	actime;
+	compat_time_t	modtime;
+};
+
 extern int compat_get_timespec64(struct timespec64 *, const void __user *);
 extern int compat_put_timespec64(const struct timespec64 *, void __user *);
 extern int get_compat_itimerspec64(struct itimerspec64 *its,