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opnsense-src/lib/libc/sys/Makefile.inc
Mark Johnston 9f9c9b22ec Reimplement brk() and sbrk() to avoid the use of _end. 
Previously, libc.so would initialize its notion of the break address
using _end, a special symbol emitted by the static linker following
the bss section.  Compatibility issues between lld and ld.bfd could
cause the wrong definition of _end (libc.so's definition rather than
that of the executable) to be used, breaking the brk()/sbrk()
interface.

Avoid this problem and future interoperability issues by simply not
relying on _end.  Instead, modify the break() system call to return
the kernel's view of the current break address, and have libc
initialize its state using an extra syscall upon the first use of the
interface.  As a side effect, this appears to fix brk()/sbrk() usage
in executables run with rtld direct exec, since the kernel and libc.so
no longer maintain separate views of the process' break address.

PR:		228574
Reviewed by:	kib (previous version)
MFC after:	2 months
Differential Revision:	https://reviews.freebsd.org/D15663
2018-06-04 19:35:15 +00:00

496 lines
10 KiB
Makefile
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# @(#)Makefile.inc 8.3 (Berkeley) 10/24/94
# $FreeBSD$
# sys sources
.PATH: ${LIBC_SRCTOP}/${LIBC_ARCH}/sys ${LIBC_SRCTOP}/sys
# Include the generated makefile containing the *complete* list
# of syscall names in MIASM.
.include "${SRCTOP}/sys/sys/syscall.mk"
# Include machine dependent definitions.
#
# MDASM names override the default syscall names in MIASM.
# NOASM will prevent the default syscall code from being generated.
# PSEUDO generates _<sys>() and __sys_<sys>() symbols, but not <sys>().
#
# While historically machine dependent, all architectures have the following
# declarations in common:
#
NOASM= exit.o \
getlogin.o \
sstk.o \
yield.o
PSEUDO= _exit.o \
_getlogin.o
.sinclude "${LIBC_SRCTOP}/${LIBC_ARCH}/sys/Makefile.inc"
SRCS+= clock_gettime.c gettimeofday.c __vdso_gettimeofday.c
NOASM+= clock_gettime.o gettimeofday.o
PSEUDO+= _clock_gettime.o _gettimeofday.o
# Sources common to both syscall interfaces:
SRCS+= \
__error.c \
interposing_table.c
SRCS+= getdents.c lstat.c mknod.c stat.c
SRCS+= fstat.c fstatat.c fstatfs.c getfsstat.c statfs.c
NOASM+= fstat.o fstatat.o fstatfs.o getfsstat.o statfs.o
PSEUDO+= _fstat.o _fstatat.o _fstatfs.o _getfsstat.o _statfs.o
SRCS+= getdirentries.c
NOASM+= getdirentries.o
PSEUDO+= _getdirentries.o
SRCS+= brk.c
SRCS+= pipe.c
SRCS+= vadvise.c
INTERPOSED = \
accept \
accept4 \
aio_suspend \
clock_nanosleep \
close \
connect \
fcntl \
fdatasync \
fsync \
fork \
kevent \
msync \
nanosleep \
open \
openat \
poll \
ppoll \
pselect \
ptrace \
read \
readv \
recvfrom \
recvmsg \
select \
sendmsg \
sendto \
setcontext \
sigprocmask \
sigsuspend \
sigtimedwait \
sigwait \
sigwaitinfo \
swapcontext \
wait4 \
wait6 \
write \
writev
.if ${MACHINE_CPUARCH} == "sparc64"
SRCS+= sigaction.c
NOASM+= sigaction.o
.else
INTERPOSED+= sigaction
.endif
SRCS+= ${INTERPOSED:S/$/.c/}
NOASM+= ${INTERPOSED:S/$/.o/}
PSEUDO+= ${INTERPOSED:C/^.*$/_&.o/}
# Add machine dependent asm sources:
SRCS+=${MDASM}
# Look though the complete list of syscalls (MIASM) for names that are
# not defined with machine dependent implementations (MDASM) and are
# not declared for no generation of default code (NOASM). Add each
# syscall that satisfies these conditions to the ASM list.
.for _asm in ${MIASM}
.if (${MDASM:R:M${_asm:R}} == "")
.if (${NOASM:R:M${_asm:R}} == "")
ASM+=$(_asm)
.endif
.endif
.endfor
SASM= ${ASM:S/.o/.S/}
SPSEUDO= ${PSEUDO:S/.o/.S/}
SRCS+= ${SASM} ${SPSEUDO}
SYM_MAPS+= ${LIBC_SRCTOP}/sys/Symbol.map
# Generated files
CLEANFILES+= ${SASM} ${SPSEUDO}
.if ${MACHINE_CPUARCH} == "amd64" || ${MACHINE_CPUARCH} == "i386" || \
${MACHINE_CPUARCH} == "powerpc" || ${MACHINE_ARCH:Marmv[67]*}
NOTE_GNU_STACK='\t.section .note.GNU-stack,"",%%progbits\n'
.else
NOTE_GNU_STACK=''
.endif
${SASM}:
printf '#include "compat.h"\n' > ${.TARGET}
printf '#include "SYS.h"\nRSYSCALL(${.PREFIX})\n' >> ${.TARGET}
printf ${NOTE_GNU_STACK} >>${.TARGET}
${SPSEUDO}:
printf '#include "compat.h"\n' > ${.TARGET}
printf '#include "SYS.h"\nPSEUDO(${.PREFIX:S/_//})\n' \
>> ${.TARGET}
printf ${NOTE_GNU_STACK} >>${.TARGET}
MAN+= abort2.2 \
accept.2 \
access.2 \
acct.2 \
adjtime.2 \
aio_cancel.2 \
aio_error.2 \
aio_fsync.2 \
aio_mlock.2 \
aio_read.2 \
aio_return.2 \
aio_suspend.2 \
aio_waitcomplete.2 \
aio_write.2 \
bind.2 \
bindat.2 \
brk.2 \
cap_enter.2 \
cap_fcntls_limit.2 \
cap_ioctls_limit.2 \
cap_rights_limit.2 \
chdir.2 \
chflags.2 \
chmod.2 \
chown.2 \
chroot.2 \
clock_gettime.2 \
close.2 \
closefrom.2 \
connect.2 \
connectat.2 \
cpuset.2 \
cpuset_getaffinity.2 \
cpuset_getdomain.2 \
dup.2 \
execve.2 \
_exit.2 \
extattr_get_file.2 \
fcntl.2 \
ffclock.2 \
fhopen.2 \
flock.2 \
fork.2 \
fsync.2 \
getdirentries.2 \
getdtablesize.2 \
getfh.2 \
getfsstat.2 \
getgid.2 \
getgroups.2 \
getitimer.2 \
getlogin.2 \
getloginclass.2 \
getpeername.2 \
getpgrp.2 \
getpid.2 \
getpriority.2 \
getrandom.2 \
getrlimit.2 \
getrusage.2 \
getsid.2 \
getsockname.2 \
getsockopt.2 \
gettimeofday.2 \
getuid.2 \
intro.2 \
ioctl.2 \
issetugid.2 \
jail.2 \
kenv.2 \
kill.2 \
kldfind.2 \
kldfirstmod.2 \
kldload.2 \
kldnext.2 \
kldstat.2 \
kldsym.2 \
kldunload.2 \
kqueue.2 \
ktrace.2 \
link.2 \
lio_listio.2 \
listen.2 \
lseek.2 \
madvise.2 \
mincore.2 \
minherit.2 \
mkdir.2 \
mkfifo.2 \
mknod.2 \
mlock.2 \
mlockall.2 \
mmap.2 \
modfind.2 \
modnext.2 \
modstat.2 \
mount.2 \
mprotect.2 \
mq_close.2 \
mq_getattr.2 \
mq_notify.2 \
mq_open.2 \
mq_receive.2 \
mq_send.2 \
mq_setattr.2 \
msgctl.2 \
msgget.2 \
msgrcv.2 \
msgsnd.2 \
msync.2 \
munmap.2 \
nanosleep.2 \
nfssvc.2 \
ntp_adjtime.2 \
numa_getaffinity.2 \
open.2 \
pathconf.2 \
pdfork.2 \
pipe.2 \
poll.2 \
posix_fadvise.2 \
posix_fallocate.2 \
posix_openpt.2 \
procctl.2 \
profil.2 \
pselect.2 \
ptrace.2 \
quotactl.2 \
rctl_add_rule.2 \
read.2 \
readlink.2 \
reboot.2 \
recv.2 \
rename.2 \
revoke.2 \
rfork.2 \
rmdir.2 \
rtprio.2
.if !defined(NO_P1003_1B)
MAN+= sched_get_priority_max.2 \
sched_setparam.2 \
sched_setscheduler.2 \
sched_yield.2
.endif
MAN+= sctp_generic_recvmsg.2 \
sctp_generic_sendmsg.2 \
sctp_peeloff.2 \
select.2 \
semctl.2 \
semget.2 \
semop.2 \
send.2 \
setfib.2 \
sendfile.2 \
setgroups.2 \
setpgid.2 \
setregid.2 \
setresuid.2 \
setreuid.2 \
setsid.2 \
setuid.2 \
shmat.2 \
shmctl.2 \
shmget.2 \
shm_open.2 \
shutdown.2 \
sigaction.2 \
sigaltstack.2 \
sigpending.2 \
sigprocmask.2 \
sigqueue.2 \
sigreturn.2 \
sigstack.2 \
sigsuspend.2 \
sigwait.2 \
sigwaitinfo.2 \
socket.2 \
socketpair.2 \
stat.2 \
statfs.2 \
swapon.2 \
symlink.2 \
sync.2 \
sysarch.2 \
syscall.2 \
thr_exit.2 \
thr_kill.2 \
thr_new.2 \
thr_self.2 \
thr_set_name.2 \
thr_suspend.2 \
thr_wake.2 \
timer_create.2 \
timer_delete.2 \
timer_settime.2 \
truncate.2 \
umask.2 \
undelete.2 \
unlink.2 \
utimensat.2 \
utimes.2 \
utrace.2 \
uuidgen.2 \
vfork.2 \
wait.2 \
write.2 \
_umtx_op.2
MLINKS+=accept.2 accept4.2
MLINKS+=access.2 eaccess.2 \
access.2 faccessat.2
MLINKS+=brk.2 sbrk.2
MLINKS+=cap_enter.2 cap_getmode.2
MLINKS+=cap_fcntls_limit.2 cap_fcntls_get.2
MLINKS+=cap_ioctls_limit.2 cap_ioctls_get.2
MLINKS+=chdir.2 fchdir.2
MLINKS+=chflags.2 chflagsat.2 \
chflags.2 fchflags.2 \
chflags.2 lchflags.2
MLINKS+=chmod.2 fchmod.2 \
chmod.2 fchmodat.2 \
chmod.2 lchmod.2
MLINKS+=chown.2 fchown.2 \
chown.2 fchownat.2 \
chown.2 lchown.2
MLINKS+=clock_gettime.2 clock_getres.2 \
clock_gettime.2 clock_settime.2
MLINKS+=nanosleep.2 clock_nanosleep.2
MLINKS+=cpuset.2 cpuset_getid.2 \
cpuset.2 cpuset_setid.2
MLINKS+=cpuset_getaffinity.2 cpuset_setaffinity.2
MLINKS+=cpuset_getdomain.2 cpuset_setdomain.2
MLINKS+=dup.2 dup2.2
MLINKS+=execve.2 fexecve.2
MLINKS+=extattr_get_file.2 extattr.2 \
extattr_get_file.2 extattr_delete_fd.2 \
extattr_get_file.2 extattr_delete_file.2 \
extattr_get_file.2 extattr_delete_link.2 \
extattr_get_file.2 extattr_get_fd.2 \
extattr_get_file.2 extattr_get_link.2 \
extattr_get_file.2 extattr_list_fd.2 \
extattr_get_file.2 extattr_list_file.2 \
extattr_get_file.2 extattr_list_link.2 \
extattr_get_file.2 extattr_set_fd.2 \
extattr_get_file.2 extattr_set_file.2 \
extattr_get_file.2 extattr_set_link.2
MLINKS+=ffclock.2 ffclock_getcounter.2 \
ffclock.2 ffclock_getestimate.2 \
ffclock.2 ffclock_setestimate.2
MLINKS+=fhopen.2 fhstat.2 fhopen.2 fhstatfs.2
MLINKS+=fsync.2 fdatasync.2
MLINKS+=getdirentries.2 getdents.2
MLINKS+=getfh.2 lgetfh.2
MLINKS+=getgid.2 getegid.2
MLINKS+=getitimer.2 setitimer.2
MLINKS+=getlogin.2 getlogin_r.3
MLINKS+=getlogin.2 setlogin.2
MLINKS+=getloginclass.2 setloginclass.2
MLINKS+=getpgrp.2 getpgid.2
MLINKS+=getpid.2 getppid.2
MLINKS+=getpriority.2 setpriority.2
MLINKS+=getrlimit.2 setrlimit.2
MLINKS+=getsockopt.2 setsockopt.2
MLINKS+=gettimeofday.2 settimeofday.2
MLINKS+=getuid.2 geteuid.2
MLINKS+=intro.2 errno.2
MLINKS+=jail.2 jail_attach.2 \
jail.2 jail_get.2 \
jail.2 jail_remove.2 \
jail.2 jail_set.2
MLINKS+=kldunload.2 kldunloadf.2
MLINKS+=kqueue.2 kevent.2 \
kqueue.2 EV_SET.3
MLINKS+=link.2 linkat.2
MLINKS+=madvise.2 posix_madvise.2
MLINKS+=mkdir.2 mkdirat.2
MLINKS+=mkfifo.2 mkfifoat.2
MLINKS+=mknod.2 mknodat.2
MLINKS+=mlock.2 munlock.2
MLINKS+=mlockall.2 munlockall.2
MLINKS+=modnext.2 modfnext.2
MLINKS+=mount.2 nmount.2 \
mount.2 unmount.2
MLINKS+=mq_receive.2 mq_timedreceive.2
MLINKS+=mq_send.2 mq_timedsend.2
MLINKS+=ntp_adjtime.2 ntp_gettime.2
MLINKS+=numa_getaffinity.2 numa_setaffinity.2
MLINKS+=open.2 openat.2
MLINKS+=pathconf.2 fpathconf.2
MLINKS+=pathconf.2 lpathconf.2
MLINKS+=pdfork.2 pdgetpid.2\
pdfork.2 pdkill.2
MLINKS+=pipe.2 pipe2.2
MLINKS+=poll.2 ppoll.2
MLINKS+=rctl_add_rule.2 rctl_get_limits.2 \
rctl_add_rule.2 rctl_get_racct.2 \
rctl_add_rule.2 rctl_get_rules.2 \
rctl_add_rule.2 rctl_remove_rule.2
MLINKS+=read.2 pread.2 \
read.2 preadv.2 \
read.2 readv.2
MLINKS+=readlink.2 readlinkat.2
MLINKS+=recv.2 recvfrom.2 \
recv.2 recvmsg.2
MLINKS+=rename.2 renameat.2
MLINKS+=rtprio.2 rtprio_thread.2
.if !defined(NO_P1003_1B)
MLINKS+=sched_get_priority_max.2 sched_get_priority_min.2 \
sched_get_priority_max.2 sched_rr_get_interval.2
MLINKS+=sched_setparam.2 sched_getparam.2
MLINKS+=sched_setscheduler.2 sched_getscheduler.2
.endif
MLINKS+=select.2 FD_CLR.3 \
select.2 FD_ISSET.3 \
select.2 FD_SET.3 \
select.2 FD_ZERO.3
MLINKS+=send.2 sendmsg.2 \
send.2 sendto.2
MLINKS+=setpgid.2 setpgrp.2
MLINKS+=setresuid.2 getresgid.2 \
setresuid.2 getresuid.2 \
setresuid.2 setresgid.2
MLINKS+=setuid.2 setegid.2 \
setuid.2 seteuid.2 \
setuid.2 setgid.2
MLINKS+=shmat.2 shmdt.2
MLINKS+=shm_open.2 shm_unlink.2
MLINKS+=sigwaitinfo.2 sigtimedwait.2
MLINKS+=stat.2 fstat.2 \
stat.2 fstatat.2 \
stat.2 lstat.2
MLINKS+=statfs.2 fstatfs.2
MLINKS+=swapon.2 swapoff.2
MLINKS+=symlink.2 symlinkat.2
MLINKS+=syscall.2 __syscall.2
MLINKS+=timer_settime.2 timer_getoverrun.2 \
timer_settime.2 timer_gettime.2
MLINKS+=thr_kill.2 thr_kill2.2
MLINKS+=truncate.2 ftruncate.2
MLINKS+=unlink.2 unlinkat.2
MLINKS+=utimensat.2 futimens.2
MLINKS+=utimes.2 futimes.2 \
utimes.2 futimesat.2 \
utimes.2 lutimes.2
MLINKS+=wait.2 wait3.2 \
wait.2 wait4.2 \
wait.2 waitpid.2 \
wait.2 waitid.2 \
wait.2 wait6.2
MLINKS+=write.2 pwrite.2 \
write.2 pwritev.2 \
write.2 writev.2
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