We do not have a hurd data block only when bootstrapping the system, in
which case we don't have a notion of suid yet anyway.

This is needed, otherwise init_standard_fds would check that standard
file descriptors are allocated, which is meaningless during bootstrap.

This patch makes build-many-glibcs.py use binutils 2.39 branch.

Tested with build-many-glibcs.py (compilers and glibcs builds).  Note:
binutils 2.39 shows the same failures for i686-linux-gnu-no-pie,
x86_64-linux-gnu-no-pie and x86_64-linux-gnu-x32-no-pie building the
glibc testsuite as binutils mainline does.

If the architecture level set is high enough, no IFUNCs are used at
all and the variable i would be unused.  Then the build fails with:
../sysdeps/s390/multiarch/ifunc-impl-list.c: In function ‘__libc_ifunc_impl_list’:
../sysdeps/s390/multiarch/ifunc-impl-list.c:76:10: error: unused variable ‘i’ [-Werror=unused-variable]
   76 |   size_t i = max;
      |          ^
cc1: all warnings being treated as errors

math/test-float128-y1 fails on x86_64 and ppc64el with gcc 12 and -O3,
because code inside a block guarded by SET_RESTORE_ROUNDL is being moved
after the rounding mode has been restored. Use math_force_eval to
prevent this (and insert some math_opt_barrier calls to prevent code
from being moved before the rounding mode is set).

Fixes #29463
Reviewed-By: Wilco Dijkstra <Wilco.Dijkstra@arm.com>

The #ifdef FSOPEN_CLOEXEC check did not work because the macro
was always defined in this header prior to the check, so that
the <linux/mount.h> contents did not matter.

Fixes commit 774058d7
("linux: Fix sys/mount.h usage with kernel headers").

The test is valid for all TLS models, but we want to make a reasonable
effort to test the GNU2 model specifically.  For example, aarch64
defaults to GNU2, but does not have -mtls-dialect=gnu2, and the test
was not run there.
Suggested-by: Martin Coufal <mcoufal@redhat.com>

I.e. from sysdeps/unix/sysv/linux/bits/in.h to netinet/in.h

It is following both the BSD and Linux definitions.
Reviewed-by: Florian Weimer <fweimer@redhat.com>

Address space for heap segments is reserved in a mmap call with
MAP_ANONYMOUS | MAP_PRIVATE and protection flags PROT_NONE.  This
reservation does not count against the RSS limit of the process or
system.  Backing memory is allocated using mprotect in alloc_new_heap
and grow_heap, and at this point, the allocator expects the kernel
to provide memory (subject to memory overcommit).

The SIGSEGV that might generate due to MAP_NORESERVE (according to
the mmap manual page) does not seem to occur in practice, it's always
SIGKILL from the OOM killer.  Even if there is a way that SIGSEGV
could be generated, it is confusing to applications that this only
happens for secondary heaps, not for large mmap-based allocations,
and not for the main arena.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Checked on arm-linux-gnueabihf.

Now that kernel exports linux/mount.h and includes it on linux/fs.h,
its definitions might clash with glibc exports sys/mount.h.  To avoid
the need to rearrange the Linux header to be always after glibc one,
the glibc sys/mount.h is changed to:

  1. Undefine the macros also used as enum constants.  This covers prior
     inclusion of <linux/mount.h> (for instance MS_RDONLY).

  2. Include <linux/mount.h> based on the usual __has_include check
     (needs to use __has_include ("linux/mount.h") to paper over GCC
     bugs.

  3. Define enum fsconfig_command only if FSOPEN_CLOEXEC is not defined.
     (FSOPEN_CLOEXEC should be a very close proxy.)

  4. Define struct mount_attr if MOUNT_ATTR_SIZE_VER0 is not defined.
     (Added in the same commit on the Linux side.)

This patch also adds some tests to check if including linux/fs.h and
linux/mount.h after and before sys/mount.h does work.

Checked on x86_64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>

Checked on x86_64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>

To avoid possible warnings if the kernel header is included before
sys/mount.h.
Reviewed-by: Florian Weimer <fweimer@redhat.com>

Instead of tying to a specific kernel version.

Checked on x86_64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>

It might be used on tests to check if a snippet build with the provided
compiler and flags.
Reviewed-by: Florian Weimer <fweimer@redhat.com>

Fix a typo in the SVE configure check. This fixes [BZ# 29394].

Improve performance of recursive IO locks by adding a fast path for
the single-threaded case. To reduce the number of memory accesses for
locking/unlocking, only increment the recursion counter if the lock
is already taken.

On Neoverse V1, a microbenchmark with many small freads improved by
2.9x. Multithreaded performance improved by 2%.
Reviewed-by: Cristian Rodríguez  <crrodriguez@opensuse.org>

So far this test checks if pidfd_open-syscall is supported,
which was introduced with linux 5.3.

The process_madvise-syscall was introduced with linux 5.10.
Thus you'll get FAILs if you are running a kernel in between.

This patch adds a check if the first process_madvise-syscall
returns ENOSYS and in this case will fail with UNSUPPORTED.
Reviewed-by: Florian Weimer <fweimer@redhat.com>

From the approved generic ABI proposal
https://groups.google.com/g/generic-abi/c/satyPkuMisk


("Add new ch_type value: ELFCOMPRESS_ZSTD").
Reviewed-by: Florian Weimer <fweimer@redhat.com>

It is not declared in a header file, and as the comment indicates,
it is not expected to be used.

`#ifndef STPCPY` is incorrect for checking if `STRCPY` is already
defined.  It doesn't end up mattering as the whole check is
guarded by `#if IS_IN (libc)` but is incorrect none the less.

GCC normally does this optimization for us in
strlen_pass::handle_builtin_strcpy but only for optimized
build. To avoid needing to include strcpy.S in the rtld build to
support the debug build, just do the optimization by hand.

Add more IEEE half conversion routines:

- Convert 32-bit/64-bit integer to IEEE half.
- Convert IEEE half to 32-bit/64-bit integer.

They are required by RISC-V _Float16 support, tested with RISC-V GCC.

Clang cannot assemble cmp in the AT&T dialect mode.

Clang cannot assemble fldt in the AT&T dialect mode.

Similar to 6720d36b for x86-64.

Clang cannot assemble movzx in the AT&T dialect mode.  Change movzx to
movzbl, which follows the AT&T dialect and is used elsewhere in the
file.

Fixes commit 0c1c3a77 ("dlfcn: Move
dlopen into libc").

DEFAULT_TOP_PAD is defined as 131072 in
sysdeps/generic/malloc-machine.h.

Now that prelink is not support, there is no need to keep supporting
rela for non bootstrap.

Now that prelink is not support, there is no need to keep supporting
rela for non bootstrap.

The older libc versions are obsolete for over twenty years now.

The older libc versions are obsolete for over twenty years now.
This patch removes the special flags for libc5 and libc4 and assumes
that all libraries cached are libc6 compatible and use FLAG_ELF_LIBC6.

Checked with a build for all affected architectures.
Co-authored-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

The environment variable was removed by
d2db60d8.

exit only terminates the current thread, not the whole process, so it
is the wrong fallback system call in this context.  All supported
Linux versions implement the exit_group system call anyway.

This patch updates the kernel version in the tests tst-mman-consts.py,
tst-mount-consts.py and tst-pidfd-consts.py to 5.18.  (There are no
new constants covered by these tests in 5.19, or in 5.17 or 5.18 in
the case of tst-mount-consts.py that previously used version 5.16,
that need any other header changes.)

Tested with build-many-glibcs.py.

Redirect internal assertion failures to __libc_assert_fail, based on
based on __libc_message, which writes directly to STDERR_FILENO
and calls abort.  Also disable message translation and reword the
error message slightly (adjusting stdlib/tst-bz20544 accordingly).

As a result of these changes, malloc no longer needs its own
redefinition of __assert_fail.

__libc_assert_fail needs to be stubbed out during rtld dependency
analysis because the rtld rebuilds turn __libc_assert_fail into
__assert_fail, which is unconditionally provided by elf/dl-minimal.c.

This change is not possible for the public assert macro and its
__assert_fail function because POSIX requires that the diagnostic
is written to stderr.
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>