Historically autofs mounts were not included in mount table
listings. This is the case in other SysV autofs implementations
and was also the case with Linux autofs.
But now that /etc/mtab is a symlink to the proc filesystem
mount table the autofs mount entries appear in the mount table
on Linux.
Prior to the symlinking of /etc/mtab mount table it was
sufficient to call mount(2) and simply not update /etc/mtab
to exclude autofs mounts from mount listings.
Also, with the symlinking of /etc/mtab we have seen a shift in
usage toward using the proc mount tables directly.
But the autofs mount entries need to be retained when coming
from the proc file system for applications that need them
(largely autofs file system users themselves) so filtering out
these entries within the kernel itself can't be done. So it
needs be done in user space.
There are three reasons to omit the autofs mount entries.
One is that certain types of auto-mounts have an autofs mount
for every entry in their autofs mount map and these maps can
be quite large. This leads to mount table listings containing
a lot of unnecessary entries.
Also, this change in behaviour between autofs implementations
can cause problems for applications that use getmntent(3) in
other OS implementations as well as Linux.
Lastly, there's very little that user space can do with autofs
mount entries since this must be left to the autofs mount owner,
typically the automount daemon. But it can also lead to attempts
to access automount managed paths resulting mounts being triggered
when they aren't needed or mounts staying mounted for much longer
thay they need be. While the point of this change ins't to help
with these problems (and it can be quite a problem) it may be
a welcome side effect.
So the Linux autofs file system has been modified to accept a
pseudo mount option of "ignore" (as is used in other OS
implementations) so that user space can use this as a hint to
skip autofs entries on reading the mount table.
The Linux autofs automount daemon used getmntent(3) itself and
has been modified to use the proc file system directly so that
it can "ignore" mount option.
The use of this mount option is opt-in and a configuration
option has been added which defaults to not use this option
so if there are applications that need these entries, other
than autofs itself, they can be retained. Also, since this
filtering is based on an added mount option earlier versions
of Linux autofs iand other autofs file system users will not
use the option and so won't be affected by the change.
This patch adds fall-through comments in some cases where -Wextra
produces implicit-fallthrough warnings.
The patch is non-exhaustive. Apart from architecture-specific code
for non-x86_64 architectures, it does not change sunrpc/xdr.c (legacy
code, probably should have such changes, but left to be dealt with
separately), or places that already had comments about the
fall-through but not matching the form expected by
-Wimplicit-fallthrough=3 (the default level with -Wextra; my
inclination is to adjust those comments to match rather than
downgrading to -Wimplicit-fallthrough=1 to allow any comment), or one
place where I thought the implicit fallthrough was not correct and so
should be handled separately as a bug fix. I think the key thing to
consider in review of this patch is whether the fall-through is indeed
intended and correct in each place where such a comment is added.
Tested for x86_64.
* elf/dl-exception.c (_dl_exception_create_format): Add
fall-through comments.
* elf/ldconfig.c (parse_conf_include): Likewise.
* elf/rtld.c (print_statistics): Likewise.
* locale/programs/charmap.c (parse_charmap): Likewise.
* misc/mntent_r.c (__getmntent_r): Likewise.
* posix/wordexp.c (parse_arith): Likewise.
(parse_backtick): Likewise.
* resolv/ns_ttl.c (ns_parse_ttl): Likewise.
* sysdeps/x86/cpu-features.c (init_cpu_features): Likewise.
* sysdeps/x86_64/dl-machine.h (elf_machine_rela): Likewise.
Hide internal __hasmntopt function to allow direct access within libc.so
and libc.a without using GOT nor PLT.
[BZ #18822]
* include/mntent.h (__hasmntopt): Add libc_hidden_proto.
* misc/mntent_r.c (__hasmntopt): Add libc_hidden_def.
The fix for BZ #17273 introduced a single byte of memory corruption when
the line is entirely blank. It would walk back past the start of the
buffer if the heap happened to be 0x20 or 0x09 and then write a NUL byte.
buffer = '\n';
end_ptr = buffer;
while (end_ptr[-1] == ' ' || end_ptr[-1] == '\t')
end_ptr--;
*end_ptr = '\0';
Fix that and rework the tests. Adding the testcase for BZ #17273 to the
existing \040 parser does not really make sense as it's unrelated, and
leads to confusing behavior: it implicitly relies on the new entry being
longer than the previous entry (since it just rewinds the FILE*). Split
it out into its own dedicated testcase instead.
When mount entry contains only four fields and have more then one space or
tab at the and, mp.mnt_freq and mp.mnt_passno will be set to some specific
values as side effect from parsing of previus mount entry. It is because
sscanf(""," %d %d ", &a, &b) returns -1, but this case is unprocessed.
Values of mp.mnt_freq and mp.mnt_passno stays unchanged. This patch is
attempt to fix described issue by removing trailing tabs and spaces.
Various POSIX functions bring in res_init.o, res_hconf.o or
mntent_r.o, which use fgets_unlocked, which is not a POSIX function.
This patch arranges for them to use __fgets_unlocked instead. (The
IS_IN (libc) conditional in rec_hconf.c is needed because that file is
also used in nscd.)
Tested for x86_64 (testsuite, and that disassembly of installed shared
libraries is unchanged by the patch except for an assertion line
number). Note that most of the linknamespace tests that failed
because of fgets_unlocked from the resolver also fail because of other
symbols brought in by the resolver, so the number of XFAILs this
removes is limited. Also note that fgets_unlocked failures for
unistd.h for XPG3/XPG4 showed up that actually unistd.h is declaring
too much for XPG3/XPG4 (bug 17665) - there is no actual need to make
getusershell.c use __fgets_unlocked (at least as regards formal
standards are concerned; maybe it should still change for
namespace-cleanness of _DEFAULT_SOURCE) because the functions there
aren't actually in any of the supported standards; the correct fix for
those failures will be to stop the *usershell* functions appearing in
unistd.h for XPG3/XPG4.
[BZ #17664]
* misc/mntent_r.c (__getmntent_r): Use __fgets_unlocked instead of
fgets_unlocked.
* resolv/res_hconf.c [IS_IN (libc)] (fgets_unlocked): Define to
__fgets_unlocked.
* resolv/res_init.c (__res_vinit): Use __fgets_unlocked instead of
fgets_unlocked.
* conform/Makefile (test-xfail-XPG4/sys/statvfs.h/linknamespace):
Remove variable.
(test-xfail-POSIX/sys/mman.h/linknamespace): Likewise.
(test-xfail-UNIX98/sys/mman.h/linknamespace): Likewise.
(test-xfail-UNIX98/sys/statvfs.h/linknamespace): Likewise.
(test-xfail-XOPEN2K/sys/mman.h/linknamespace): Likewise.
(test-xfail-XOPEN2K/sys/statvfs.h/linknamespace): Likewise.
(test-xfail-POSIX2008/sys/mman.h/linknamespace): Likewise.
(test-xfail-POSIX2008/sys/statvfs.h/linknamespace): Likewise.
(test-xfail-XOPEN2K8/sys/mman.h/linknamespace): Likewise.
(test-xfail-XOPEN2K8/sys/statvfs.h/linknamespace): Likewise.
2003-12-17 Jakub Jelinek <jakub@redhat.com>
* malloc/mtrace.c (tr_old_memalign_hook): New variable.
(tr_memalignhook): New function.
(mtrace): Register tr_memalignhook.
(muntrace): Deregister tr_memalignhook.
* malloc/malloc.c (__posix_memalign): If __memalign_hook != NULL,
call it directly instead of memalign_internal.
2003-12-17 Ulrich Drepper <drepper@redhat.com>
* misc/mntent_r.c: Change encoding to match recently change decoder.
Patch by Alexander Achenbach <xela@slit.de>.
2003-12-16 Steven Munroe <sjmunroe@us.ibm.com>
* sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h: Correct definition of
vrregset_t.
2003-12-16 Steven Munroe <sjmunroe@us.ibm.com>
* sysdeps/unix/sysv/linux/powerpc/sys/procfs.h [!__PPC64_ELF_H]: Extent
conditional to include typedef elf_vrreg_t.
2002-12-17 Paolo Bonzini <bonzini@gnu.org>
* posix/regexec.c (re_search_internal): Limit search to the
beginning of the buffer if the initial states are empty for
contexts that do not include CONTEXT_BEGBUF or, if
!preg->newline_anchor, that do not include any one of
CONTEXT_BEGBUF and CONTEXT_NEWLINE.
2003-11-29 Ulrich Drepper <drepper@redhat.com>
* misc/mntent_r.c (decode_name): Be compatible with util-linux and
recognize \134 as well.
(ELF_NGREG): New #define.
(elf_greg_t): New type.
(pt_all_user_regs): New type.
* sysdeps/mach/hurd/chown.c: Use INTDEF for __chown.
* sysdeps/unix/sysv/aix/chown.c: Likewise.
* sysdeps/unix/grantpt.c: Use INTUSE for __chown calls.
* sysdeps/unix/sysv/linux/m68k/chown.c: Likewise.
* sysdeps/unix/sysv/linux/powerpc/chown.c: Likewise.
* sysdeps/unix/sysv/linux/i386/chown.c: Use INTDEF2 to define
__chown_internal.
* sysdeps/unix/sysv/linux/s390/s390-32//chown.c: Likewise.
* intl/dcngettext.c [_LIBC]: Use INTUSE for __dcngettext.
* intl/dngettext.c [_LIBC] (DCNGETTEXT): Use INTUSE.
* intl/ngettext.c: Likewise.
* include/sys/socket.h: Declare __connect_internal and define
__connect macro if not NOT_IN_libc.
* sysdeps/mach/hurd/connect.c: Use INTDEF for __connect.
* sysdeps/unix/sysv/aix/connect.c: Likewise.
* sysdeps/unix/sysv/linux/connect.S: Add __connect_internal alias.
* include/unistd.h: Declare __close_internal and define __close macro
if not NOT_IN_libc.
* libio/libioP.h (JUMO0, JUMP1, JUMP2, JUMP3, WJUMP0, WJUMP1, WJUMP2,
WJUMP3): Add extra parenthesis to avoid expanding element names with
macors like __close.
* sysdeps/unix/syscalls.list: Add __close_internal alias.
* include/unistd.h: Declare __dup2_internal and define __dup2 macro
if not NOT_IN_libc.
* sysdeps/mach/hurd/dup2.c: Use INTDEF for __dup2.
* sysdeps/posix/dup2.c: Use INTDEF for __dup2.
* sysdeps/unix/syscalls.list: Add __dup2_internal alias.
* include/unistd.h: Declare __fork_internal and define __fork macro
if not NOT_IN_libc.
* sysdeps/mach/hurd/fork.c: Use INTDEF for __fork.
* sysdeps/unix/sysv/aix/fork.c: Likewise.
* sysdeps/unix/sysv/linux/syscalls.list: Add __fork_internal alias.
* include/stdio_ext.h: Declare __fsetlocking_internal and define
__fsetlocking macro to use it if not NOT_IN_libc.
* libio/__fsetlocking.c: Use INTDEF for __fsetlocking.
* libio/__fbufsize.c: Correct copyright.
* libio/__flbf.c: Likewise.
* libio/__fpending.c: Likewise.
* libio/__fpurge.c: Likewise.
* libio/__freadable.c: Likewise.
* libio/__freading.c: Likewise.
* libio/__fsetlocking.c: Likewise.
* libio/__fwritable.c: Likewise.
* libio/__fwriting.c: Likewise.
* include/stdio.h: Declare __asprintf_internal and define __asprintf
macro to use it if not NOT_IN_libc.
* stdio-common/asprintf.c: Use INTDEF for __asprintf.
* include/mntent.h: Declare __setmntent_internal,
__getmntent_r_internal, __endmntent_internal. Define __setmntent,
__getmntent_r, and __endmntent macros to use these functions if not
NOT_IN_libc.
* misc/mntent_r.c: Use INTDEF for __setmntent, __getmntent_r, and
__endmntent.
* include/math.h: Declare __finite_internal, __finitef_internal, and
__finitel_internal. Redefine isfinite macro if in libc or libm using
these functions.
* sysdeps/generic/s_ldexp.c: Use INTUSE for __finite calls.
* sysdeps/generic/s_ldexpf.c: Use INTUSE for __finitef calls.
* sysdeps/generic/s_ldexpl.c: Use INTUSE for __finitel calls.
* sysdeps/i386/fpu/s_finite.S: Define _internal alias.
* sysdeps/i386/fpu/s_finitef.S: Likewise.
* sysdeps/i386/fpu/s_finitel.S: Likewise.
* sysdeps/ieee754/dbl-64/s_finite.c: Likewise.
* sysdeps/ieee754/flt-32/s_finitef.c: Likewise.
* sysdeps/ieee754/ldbl-128/s_finitel.c: Likewise.
* sysdeps/ieee754/ldbl-96/s_finitel.c: Likewise.
* include/fcntl.h: Declare __fcntl_internal. Define __fcntl macro
to use this function if not NOT_IN_libc.
* libio/iofdopen.c (_IO_fcntl): Use INTUSE.
* sysdeps/generic/fcntl.c: Use INTDEF for __fcntl.
* sysdeps/mach/hurd/fcntl.c: Likewise.
* sysdeps/unix/sysv/aix/fcntl.c: Likewise.
* sysdeps/unix/sysv/linux/i386/fcntl.c: Likewise.
* include/argz.h: Declare __argz_count_internal and
__argz_stringify_internal.
* intl/l10nflist.c [_LIBC]: Use INTUSE for __argz_count and
__argz_stringify.
* string/argz-count.c: Use INTDEF for __argz_count.
* string/argz-stringify.c: Use INTDEF for __argz_stringify.
* include/stdlib.h: Declare __cxa_atexit_internal and define
__cxa_atexit macro if not NOT_IN_libc.
* stdlib/cxa_atexit.c: Use INTDEF for __cxa_atexit.
* dlfcn/Makefile: Define NOT_IN_libc when compiling modcxaatexit.c.
* assert/assert.c: Use INTDEF for __assert_fail.
* assert/__assert.c: Use INTUSE for call to __assert_fail.
* include/assert.h: Declare __assert_fail_internal.
2001-07-06 Paul Eggert <eggert@twinsun.com>
* manual/argp.texi: Remove ignored LGPL copyright notice; it's
not appropriate for documentation anyway.
* manual/libc-texinfo.sh: "Library General Public License" ->
"Lesser General Public License".
2001-07-06 Andreas Jaeger <aj@suse.de>
* All files under GPL/LGPL version 2: Place under LGPL version
2.1.
* misc/getusershell.c: Make strings in okshells array const.
* misc/regexp.c: Add const to cast to avoid warnings.
* sysdeps/unix/sysv/linux/llseek.c: Add prototype for __llseek.
* sysdeps/unix/sysv/linux/i386/setresuid.c: Add prototype for
__setresuid.
* sysdeps/unix/sysv/linux/i386/setresgid.c: Add prototype for
setresgid.
* misc/error.c: Add prototypes for __error and __error_at_line.
* misc/mntent_r.c (__getmntent_r): Add break at end of switch
statement to avoid warning.
Sat Sep 28 03:02:49 1996 Ulrich Drepper <drepper@cygnus.com>
* dirent/Makefile (routines): Add readdir_r.
* dirent/readdir_r.c: New file. Wrapper around readdir.c.
* dirent/dirent.h: Add prototype for readdir_r.
* misc/hsearch_r.c (ENTRY): Make field `used' of type `unsigned int'
to prevent warnings.
* sysdeps/unix/sysv/linux/getsysstats.c (get_proc_path):
Initialize `result'.
Sat Sep 28 01:16:42 1996 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/generic/strsep.c: Rename to __strsep and make strsep
weak alias.
* string/string.h: Add prototype for __strsep.
* misc/mntent_r.c: Use __strsep instead of strsep to keep
namespace clean.
* sysdeps/stub/nanosleep.c: Rename to __libc_nanosleep and make
__nanosleep and nanosleep weak aliases.
* sysdeps/unix/sysv/linux/syscalls.list: Add __nanosleep as weak
alias.
* sysdeps/unix/sysv/linux/sleep.c: Call __nanosleep instead of
nanosleep to keep namespace clean.
* sysdeps/posix/ttyname.c (ttyname): Add cast to prevent warning.
* sysdeps/posix/ttyname_r.c (ttyname_r): Likewise.
* sysdeps/posix/getcwd.c (__getcwd): Likewise.
* sysdeps/unix/nlist.c: Use ISO C definition since we don't always
have prototype.
* login/Makefile (headers): Add pty.h.
* login/pty.h: New file.
* sysdeps/generic/pty.h: Include <pty.h>.
* login/pututline_r.c: Add cast to prevent warning.
* gmon/gmon.c: Add prototype for __profile_frequency.
(monstartup): Add cast to prevent warning.
* sysdeps/generic/prof-freq.c: Change to use ISO C style definition.
* locale/programs/ld-time.c (time_output): Write `era' information
in correct order.
Sat Sep 28 00:11:08 1996 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/syscalls.list: Add weak alias
`adjtimex'.
Set caller for mlock, mlockall, mremap, munlock, and munlockall
to EXTRA.
Reported by Matthias Urlichs <smurf@smurf.noris.de>.
1996-09-27 Paul Eggert <eggert@twinsun.com>
* strftime.c (strftime): Output incomplete formats like %E
at end of string.
1996-09-27 Paul Eggert <eggert@twinsun.com>
* strftime.c (strftime): Add support for %EC and %Ey.
Fix support for %EY. This uses the new _nl_get_era_entry function.
Fri Sep 27 14:12:27 1996 Ulrich Drepper <drepper@cygnus.com>
Security related patch by Elliot Lee <sopwith@redhat.com> and
David Holland <dholland@eecs.harvard.edu>.
* inet/rexec.c (rexec): Increase size of `num' array from 8 to 32.
* inet/ruserpass.c (ruserpass): Don't allow $HOME envvar to not exist.
* sysdeps/generic/getenv.c (__secure_getenv): New function. Return
NULL when programs runs with SUID or SGID enabled.
* sysdeps/stub/getenv.c: Make __secure_getenv an alias of getenv.
* stdlib/stdlib.h: Add prototype for __secure_getenv.
* locale/setlocale.c: Use __secure_getenv.
* resolv/res_init.c: Likewise.
* resolv/res_query.c: Likewise.
* inet/ruserpass.c: Likewise.
* sysdeps/posix/tempname.c: Likewise.
* malloc/mtrace.c: Likewise.
* catgets/catgets.c: Likewise.
Make temporary file handling functions reentrant.
* stdio-common/tmpnam.c: Rewrite to have own buffer to write
result to. The called __stdio_gen_tempname function must be
thread safe.
* stdio-common/tmpnam_r.c: New file.
* stdio/stdio.h: Add prototype for `tmpnam_r'.
Change prototype for __stdio_gen_tempname.
* stdio/libio.h: Likewise.
* sysdeps/posix/tempname.c: Add new parameters and use them instead
of static buffer.
Don't reset `indeces' when PID changed between calls.
Don't fail for long running programs when index counter once
reached the limit.
* sysdeps/stub/tempname.c: Likewise.
* stdio-common/tempnam.c: Provide local buffer as extra argument
to __stdio_gen_tempname. This makes this function reentrant.
* stdio-common/tmpfile.c: Likewise.
* stdio-common/temptest.c: Provide extra argument to
__stdio_gen_tempname.
* manual/filesys.texi: Describe tmpnam_r and add comments about
reentrancy of the functions.
* inet/rcmd.c: Fixed address length handling.
* sysdeps/posix/mk-stdiolim.c: Count final \0 byte in L_tmpnam value.
* time/strftime.c: Remove unused variables alt_digits and
end_alt_digits.
* sysdeps/unix/sysv/linux/sys/sysinfo.h: Correct prototype names
for get_nprocs and get_nprocs_conf.
* sysdeps/generic/sys/sysinfo.h: Likewise.
* stdlib/test-canon.c: Finally do the right fix.
* misc/Makefile: Only compile force-wrapper when compiling
reentrant libc.
