glibc.git/include/string.h, branch zack/remove-libcrypt

chk: Add and fix hidden builtin definitions for *_chk

2023-08-03T20:46:48+00:00

Otherwise on gnu-i686 there are unwanted PLT entries in libc.so when
fortification is enabled.

Tested for i686-gnu, x86_64-gnu, i686-linux-gnu and x86_64-linux-gnu

string: Ensure *_chk routines have their hidden builtin definition available

2023-07-05T14:59:48+00:00

If libc_hidden_builtin_{def,proto} isn't properly set for *_chk routines,
there are unwanted PLT entries in libc.so.

Reviewed-by: Siddhesh Poyarekar

Implement strlcpy and strlcat [BZ #178]

2023-06-14T16:10:08+00:00

These functions are about to be added to POSIX, under Austin Group
issue 986.

The fortified strlcat implementation does not raise SIGABRT if the
destination buffer does not contain a null terminator, it just
inherits the non-failing regular strlcat behavior.

Reviewed-by: Siddhesh Poyarekar

string: Remove string_private.h

2023-02-17T18:56:54+00:00

Now that _STRING_ARCH_unaligned is not used anymore.

Reviewed-by: Wilco Dijkstra

string: Add libc_hidden_proto for memrchr

2023-02-08T20:13:58+00:00

Although static linker can optimize it to local call, it follows the
internal scheme to provide hidden proto and definitions.

Reviewed-by: Carlos Eduardo Seo

string: Add libc_hidden_proto for strchrnul

2023-02-08T20:13:56+00:00

Although static linker can optimize it to local call, it follows the
internal scheme to provide hidden proto and definitions.

Reviewed-by: Carlos Eduardo Seo

String: Add hidden defs for __memcmpeq() to enable internal usage

2021-10-26T21:51:29+00:00

No bug.

This commit adds hidden defs for all declarations of __memcmpeq. This
enables usage of __memcmpeq without the PLT for usage internal to
GLIBC.

string: Enable __FORTIFY_LEVEL=3

2020-12-31T11:25:21+00:00

This change enhances fortified string functions to use
__builtin_dynamic_object_size under _FORTIFY_SOURCE=3 whenever the
compiler supports it.

hurd: keep only required PLTs in ld.so

2020-11-11T01:36:22+00:00

We need NO_RTLD_HIDDEN because of the need for PLT calls in ld.so.
See Roland's comment in
https://sourceware.org/bugzilla/show_bug.cgi?id=15605
"in the Hurd it's crucial that calls like __mmap be the libc ones
instead of the rtld-local ones after the bootstrap phase, when the
dynamic linker is being used for dlopen and the like."

We used to just avoid all hidden use in the rtld ; this commit switches to
keeping only those that should use PLT calls, i.e. essentially those defined in
sysdeps/mach/hurd/dl-sysdep.c:

__assert_fail
__assert_perror_fail
__*stat64
_exit

This fixes a few startup issues, notably the call to __tunable_get_val that is
made before PLTs are set up.

string: Add sigabbrev_np and sigdescr_np

2020-07-07T17:57:14+00:00

The sigabbrev_np returns the abbreviated signal name (e.g. "HUP" for
SIGHUP) while sigdescr_np returns the string describing the error
number (e.g "Hangup" for SIGHUP).  Different than strsignal,
sigdescr_np does not attempt to translate the return description and
both functions return NULL for an invalid signal number.

They should be used instead of sys_siglist or sys_sigabbrev and they
are both thread and async-signal safe.  They are added as GNU
extensions on string.h header (same as strsignal).

Checked on x86-64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu,
and s390x-linux-gnu.

Tested-by: Carlos O'Donell 
Reviewed-by: Carlos O'Donell