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y2038: allow disabling time32 system calls

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At the moment, the compilation of the old time32 system calls depends
purely on the architecture. As systems with new libc based on 64-bit
time_t are getting deployed, even architectures that previously supported
these (notably x86-32 and arm32 but also many others) no longer depend on
them, and removing them from a kernel image results in a smaller kernel
binary, the same way we can leave out many other optional system calls.

More importantly, on an embedded system that needs to keep working
beyond year 2038, any user space program calling these system calls
is likely a bug, so removing them from the kernel image does provide
an extra debugging help for finding broken applications.

I've gone back and forth on hiding this option unless CONFIG_EXPERT
is set. This version leaves it visible based on the logic that
eventually it will be turned off indefinitely.

Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2019-07-15 11:46:10 +02:00
parent bd40a17576
commit 942437c97f
2 changed files with 25 additions and 1 deletions
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3
arch/Kconfig
View File

@ -797,7 +797,8 @@ config COMPAT_OLD_SIGACTION
bool bool
config COMPAT_32BIT_TIME config COMPAT_32BIT_TIME
def_bool !64BIT || COMPAT bool "Provide system calls for 32-bit time_t"
default !64BIT || COMPAT
help help
This enables 32 bit time_t support in addition to 64 bit time_t support. This enables 32 bit time_t support in addition to 64 bit time_t support.
This is relevant on all 32-bit architectures, and 64-bit architectures This is relevant on all 32-bit architectures, and 64-bit architectures

23
kernel/sys_ni.c
View File

@ -410,6 +410,29 @@ COND_SYSCALL(send);
COND_SYSCALL(bdflush); COND_SYSCALL(bdflush);
COND_SYSCALL(uselib); COND_SYSCALL(uselib);
/* optional: time32 */
COND_SYSCALL(time32);
COND_SYSCALL(stime32);
COND_SYSCALL(utime32);
COND_SYSCALL(adjtimex_time32);
COND_SYSCALL(sched_rr_get_interval_time32);
COND_SYSCALL(nanosleep_time32);
COND_SYSCALL(rt_sigtimedwait_time32);
COND_SYSCALL_COMPAT(rt_sigtimedwait_time32);
COND_SYSCALL(timer_settime32);
COND_SYSCALL(timer_gettime32);
COND_SYSCALL(clock_settime32);
COND_SYSCALL(clock_gettime32);
COND_SYSCALL(clock_getres_time32);
COND_SYSCALL(clock_nanosleep_time32);
COND_SYSCALL(utimes_time32);
COND_SYSCALL(futimesat_time32);
COND_SYSCALL(pselect6_time32);
COND_SYSCALL_COMPAT(pselect6_time32);
COND_SYSCALL(ppoll_time32);
COND_SYSCALL_COMPAT(ppoll_time32);
COND_SYSCALL(utimensat_time32);
COND_SYSCALL(clock_adjtime32);
/* /*
* The syscalls below are not found in include/uapi/asm-generic/unistd.h * The syscalls below are not found in include/uapi/asm-generic/unistd.h