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To provide a y2038 safe interface a new symbol __shmctl64 is added and __shmctl is change to call it instead (it adds some extra buffer copying for the 32 bit time_t implementation). Two new structures are added: 1. kernel_shmid64_ds: used internally only on 32-bit architectures to issue the syscall. A handful of architectures (hppa, i386, mips, powerpc32, and sparc32) require specific implementations due to their kernel ABI. 2. shmid_ds64: this is only for __TIMESIZE != 64 to use along with the 64-bit shmctl. It is different than the kernel struct because the exported 64-bit time_t might require different alignment depending on the architecture ABI. So the resulting implementation does: 1. For 64-bit architectures it assumes shmid_ds already contains 64-bit time_t fields and will result in just the __shmctl symbol using the __shmctl64 code. The shmid_ds argument is passed as-is to the syscall. 2. For 32-bit architectures with default 64-bit time_t (newer ABIs such riscv32 or arc), it will also result in only one exported symbol but with the required high/low time handling. 3. Finally for 32-bit architecture with both 32-bit and 64-bit time_t support we follow the already set way to provide one symbol with 64-bit time_t support and implement the 32-bit time_t support using of the 64-bit one. The default 32-bit symbol will allocate and copy the shmid_ds over multiple buffers, but this should be deprecated in favor of the __shmctl64 anyway. Checked on i686-linux-gnu and x86_64-linux-gnu. I also did some sniff tests on powerpc, powerpc64, mips, mips64, armhf, sparcv9, and sparc64. Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Tested-by: Alistair Francis <alistair.francis@wdc.com> Tested-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com> |
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.. | ||
bits | ||
mips32 | ||
mips64 | ||
sys | ||
____longjmp_chk.c | ||
_test_and_set.c | ||
brk.c | ||
clone.S | ||
configure | ||
configure.ac | ||
dl-cache.h | ||
dl-static.c | ||
errlist-compat.c | ||
getcontext.S | ||
getrlimit64.c | ||
getsysstats.c | ||
Implies | ||
kernel_rt_sigframe.h | ||
kernel_sigaction.h | ||
kernel_stat.h | ||
kernel_termios.h | ||
kernel-features.h | ||
ldsodefs.h | ||
libc-abis | ||
makecontext.S | ||
Makefile | ||
mmap_info.h | ||
pipe.S | ||
readelflib.c | ||
register-dump.h | ||
setcontext.S | ||
setrlimit64.c | ||
shlib-versions | ||
sigcontextinfo.h | ||
struct_kernel_msqid64_ds.h | ||
struct_kernel_semid64_ds.h | ||
struct_kernel_shmid64_ds.h | ||
swapcontext.S | ||
syscalls.list | ||
sysdep.h | ||
ucontext_i.sym | ||
unwind-arch.h | ||
ustat.c | ||
Versions | ||
vfork.S | ||
xstatconv.c |