Szabolcs Nagy [Mon, 27 Nov 2017 01:16:14 +0000 (01:16 +0000)]
mips,powerpc: fix TIOCSER_TEMT in termios.h
use the same token to define TIOCSER_TEMT as is used in ioctl.h
so when both headers are included there are no redefinition warnings
during musl build.
Szabolcs Nagy [Sun, 26 Nov 2017 22:21:31 +0000 (22:21 +0000)]
sys/socket.h: add PF_SMC from linux v4.11
add AF_SMC and PF_SMC for the IBM shared memory communication protocol.
new in linux commit ac7138746e14137a451f8539614cdd349153e0c0
(linux socket.h is not in uapi so this update was missed earlier)
Rich Felker [Wed, 21 Feb 2018 19:19:01 +0000 (14:19 -0500)]
update authors/contributors list
these additions were made by scanning git log since the last major
update in commit 790580b2fc47bc20e613336cb937a120422a770c. in addition
to git-level commit authorship, "patch by" text in the commit message
was also scanned. this idiom was used in the past for patches that
underwent substantial edits when merging or where the author did not
provide a commit message. going forward, my intent is to use commit
authorship consistently for attribution.
as before my aim was adding everyone with either substantial code
contributions or a pattern of ongoing simple patch submission; any
omissions are unintentional.
Matúš Olekšák [Wed, 21 Feb 2018 17:03:04 +0000 (12:03 -0500)]
fix detection of LIBCC for compiler-rt with clang
Maintainer's note: at one point, -lcompiler_rt apparently worked, and
may still work and be preferable if one has manually installed the
library in a public lib directory. but with current versions of clang,
the full pathname to the library file is needed. the original patch
removed the -lcompiler_rt check; I have left it in place in case there
are users depending on it, and since, when it does work, it's
preferable so as not to code a dependency on the specific compiler
version and paths in config.mak.
Rich Felker [Wed, 21 Feb 2018 16:59:34 +0000 (11:59 -0500)]
convert execvp error handling to switch statement
this is more extensible if we need to consider additional errors, and
more efficient as long as the compiler does not know it can cache the
result of __errno_location (a surprisingly complex issue detailed in
commit a603a75a72bb469c6be4963ed1b55fabe675fe15).
It's better to make execvp continue PATH search on ENOTDIR rather than
issuing an error. Bogus entries should not render rest of PATH invalid.
Maintainer's note: POSIX seems to require the search to continue like
this as part of XBD 8.3 Other Environment Variables. Only errors that
conclusively determine non-existence are candidates for continuing;
otherwise for consistency we have to report the error.
Rich Felker [Mon, 12 Feb 2018 01:48:14 +0000 (20:48 -0500)]
fix incorrect overflow check for allocation in fmemopen
when a null buffer pointer is passed to fmemopen, requesting it
allocate its own memory buffer, extremely large size arguments near
SIZE_MAX could overflow and result in underallocation. this results
from omission of the size of the cookie structure in the overflow
check but inclusion of it in the calloc call.
instead of accounting for individual small contributions to the total
allocation size needed, simply reject sizes larger than PTRDIFF_MAX,
which will necessarily fail anyway. then adding arbitrary fixed-size
structures is safe without matching up the expressions in the
comparison and the allocation.
Dmitry V. Levin [Fri, 12 Jan 2018 15:12:24 +0000 (18:12 +0300)]
make getcwd fail if it cannot obtain an absolute path
Currently getcwd(3) can succeed without returning an absolute path
because the underlying getcwd syscall, starting with linux commit
v2.6.36-rc1~96^2~2, may succeed without returning an absolute path.
This is a conformance issue because "The getcwd() function shall
place an absolute pathname of the current working directory
in the array pointed to by buf, and return buf".
Fix this by checking the path returned by syscall and failing with
ENOENT if the path is not absolute. The error code is chosen for
consistency with the case when the current directory is unlinked.
Similar issue was fixed in glibc recently, see
https://sourceware.org/bugzilla/show_bug.cgi?id=22679
Rich Felker [Wed, 7 Feb 2018 19:31:42 +0000 (14:31 -0500)]
disallow non-absolute rpath $ORIGIN for suid/sgid/AT_SECURE processes
in theory non-absolute origins can only arise when either the main
program is invoked by running ldso as a command (inherently non-suid)
or when dlopen was called with a relative pathname containing at least
one slash. such usage would be inherently insecure in an suid program
anyway, so the old behavior here does not seem to have been insecure.
harden against it anyway.
Rich Felker [Wed, 7 Feb 2018 19:27:08 +0000 (14:27 -0500)]
honor rpath $ORIGIN for ldd/ldso command with program in working dir
the rpath fixup code assumed any module's name field would contain at
least one slash, an invariant which is usually met but not in the case
of a main executable loaded from the current working directory by
running ldd or ldso as a command. it would be possible to make this
invariant always hold, but it has a higher runtime allocation cost and
does not seem useful elsewhere, so just patch things up in fixup_rpath
instead.
Rich Felker [Tue, 6 Feb 2018 17:31:06 +0000 (12:31 -0500)]
adjust strftime + modifier to match apparent intent of POSIX
it's unclear from the specification whether the word "consumes" in
"consumes more than four bytes to represent a year" refers just to
significant places or includes leading zeros due to field width
padding. however the examples in the rationale indicate that the
latter was the intent. in particular, the year 270 is shown being
formatted by %+5Y as +0270 rather than 00270.
previously '+' prefixing was implemented just by comparing the year
against 10000. instead, count the number of significant digits and
padding bytes to be added, and use the total to determine whether to
apply the '+' prefix.
Rich Felker [Mon, 5 Feb 2018 18:36:04 +0000 (13:36 -0500)]
fix strftime field widths with %F format and zero year
the code to strip initial sign and leading zeros inadvertently
stripped all the zeros and the subsequent '-' separating the month.
instead, only strip sign characters from the very first position, and
only strip zeros when they are followed by another digit.
Rich Felker [Mon, 5 Feb 2018 16:45:52 +0000 (11:45 -0500)]
document pthread structure ABI constraints in comments
in the original submission of the patch that became commit 7c709f2d4f9872d1b445f760b0e68da89e256b9e, and in subsequent reading of
it by others, it was not clear that the new member had to be inserted
before canary_at_end, or that inserting it at that location was safe.
add comments to document.
Do not retry waitpid if the child was terminated by a signal. Do not
examine status: since we are not passing any flags, we will not receive
stop or continue notifications.
Rich Felker [Mon, 5 Feb 2018 16:31:11 +0000 (11:31 -0500)]
revert regression in faccessat AT_EACCESS robustness
commit f9fb20b42da0e755d93de229a5a737d79a0e8f60 switched from using a
pipe for the result to conveying it via the child process exit status.
Alexander Monakov pointed out that the latter could fail if the
application is not expecting faccessat to produce a child and performs
a wait operation with __WCLONE or __WALL, and that it is not clear
whether it's guaranteed to work when SIGCHLD's disposition has been
set to SIG_IGN.
in addition, that commit introduced a bug that caused EACCES to be
produced instead of EBUSY due to an exit path that was overlooked when
the error channel was changed, and introduced a spurious retry loop
around the wait operation.
Rich Felker [Fri, 2 Feb 2018 17:15:43 +0000 (12:15 -0500)]
adjust dladdr dli_fbase definition to match other implementations
the Linux and FreeBSD man pages for dladdr document dli_fbase as the
"base address" of the library/module found. normally (e.g. AT_BASE)
the term "base" is used to denote the base address relative to which
p_vaddr addresses are interpreted; however in the case of dladdr's
Dl_info structure, existing implementations define it as the lowest
address of the mapping, which makes sense in the context of
determining which module's memory range the input address falls
within.
since this is a nonstandard interface provided to mimic one provided
by other implementations, adjust it to match their behavior.
Samuel Holland [Tue, 30 Jan 2018 02:36:42 +0000 (20:36 -0600)]
getopt_long: accept prefix match of long options containing equals signs
Consider the first equals sign found in the option to be the delimiter
between it and its argument, even if it matches an equals sign in the
option name. This avoids consuming the equals sign, which would prevent
finding the argument. Instead, it forces a partial match of the part of
the option name before the equals sign.
Maintainer's note: GNU getopt_long does not explicitly document this
behavior, but it can be seen as a consequence of how partial matches
are specified, and at least GNU (bfd) ld is known to make use of it.
Samuel Holland [Tue, 30 Jan 2018 02:36:41 +0000 (20:36 -0600)]
fix getopt_long arguments to partial matches
If we find a partial option name match, we need to keep looking for
ambiguous/conflicting options. However, we need to remember the position
in the candidate argument to find its option-argument later, if there is
one. This fixes e.g. option "foobar" being given as "--fooba=baz".
Rich Felker [Thu, 11 Jan 2018 01:45:02 +0000 (20:45 -0500)]
fix printf alt-form octal with value 0 and no explicit precision
commit 78897b0dc00b7cd5c29af5e0b7eebf2396d8dce0 wrongly simplified
Dmitry Levin's original submitted patch fixing alt-form octal with the
zero flag and field width present, omitting the special case where the
value is zero. as a result, printf("%#o",0) wrongly prints "00" rather
than "0".
the logic prior to this commit was actually better, in that it was
aligned with how the alt-form flag (#) for printf is specified ("it
shall increase the precision"). at the time there was no good way to
avoid the zero flag issue with the old logic, but commit 167dfe9672c116b315e72e57a55c7769f180dffa added tracking of whether an
explicit precision was provided.
Jens Gustedt [Wed, 3 Jan 2018 13:17:12 +0000 (14:17 +0100)]
consistently use the LOCK an UNLOCK macros
In some places there has been a direct usage of the functions. Use the
macros consistently everywhere, such that it might be easier later on to
capture the fast path directly inside the macro and only have the call
overhead on the slow path.
Jens Gustedt [Wed, 3 Jan 2018 13:17:12 +0000 (14:17 +0100)]
new lock algorithm with state and congestion count in one atomic int
A variant of this new lock algorithm has been presented at SAC'16, see
https://hal.inria.fr/hal-01304108. A full version of that paper is
available at https://hal.inria.fr/hal-01236734.
The main motivation of this is to improve on the safety of the basic lock
implementation in musl. This is achieved by squeezing a lock flag and a
congestion count (= threads inside the critical section) into a single
int. Thereby an unlock operation does exactly one memory
transfer (a_fetch_add) and never touches the value again, but still
detects if a waiter has to be woken up.
This is a fix of a use-after-free bug in pthread_detach that had
temporarily been patched. Therefore this patch also reverts
This is also the only place where internal knowledge of the lock
algorithm is used.
The main price for the improved safety is a little bit larger code.
Under high congestion, the scheduling behavior will be different
compared to the previous algorithm. In that case, a successful
put-to-sleep may appear out of order compared to the arrival in the
critical section.
Hauke Mehrtens [Sat, 6 Jan 2018 22:32:52 +0000 (23:32 +0100)]
add additional uapi guards for Linux kernel header files
With Linux kernel 4.16 it will be possible to guard more parts of the
Linux header files from a libc. Make use of this in musl to guard all
the structures and other definitions from the Linux header files which
are also defined by the header files provided by musl. This will make
it possible to compile source files which include both the libc
headers and the kernel userspace headers.
This extends the definitions done in commit 04983f227238 ("make
netinet/in.h suppress clashing definitions from kernel headers")
Rich Felker [Tue, 19 Dec 2017 03:08:54 +0000 (22:08 -0500)]
add support for BOM-determined-endian UCS2, UTF-16, and UTF-32 to iconv
previously, the charset names without endianness specified were always
interpreted as big endian. unicode specifies that UTF-16 and UTF-32
have BOM-determined endianness if BOM is present, and are otherwise
big endian. since commit 5b546faa67544af395d6407553762b37e9711157
added support for stateful encodings, it is now possible to implement
BOM support via the conversion descriptor state.
for conversions to these charsets, the output is always big endian and
does not have a BOM.
Rich Felker [Tue, 19 Dec 2017 00:33:56 +0000 (19:33 -0500)]
update case mappings to unicode 10.0
the mapping tables and code are not automatically generated; they were
produced by comparing the output of towupper/towlower against the
mappings in the UCD, ignoring characters that were previously excluded
from case mappings or from alphabetic status (micro sign and circled
letters), and adding table entries or code for everything else
missing.
Rich Felker [Mon, 18 Dec 2017 23:01:42 +0000 (18:01 -0500)]
reformat ctype tables to be diff-friendly, match tool output
the new version of the code used to generate these tables forces a
newline every 256 entries, whereas at the time these files were
originally generated and committed, it only wrapped them at 80
columns. the new behavior ensures that localized changes to the
tables, if they are ever needed, will produce localized diffs.
Nicholas Wilson [Thu, 7 Dec 2017 15:55:52 +0000 (15:55 +0000)]
remove unused explicit dependency rules for crti/crtn
notes by maintainer:
commit 2f853dd6b9a95d5b13ee8f9df762125e0588df5d added these rules
because the new system for handling arch-provided replacement files
introduced for out-of-tree builds did not apply to the crt tree.
commit 63bcda4d8f4074e9d92ae156afd0dced6e64eb65 later adapted the
makefile logic so that the crt and ldso trees go through the same
replacement logic as everything else, but failed to remove the
explicit rules that assumed the arch would always provide asm
replacements.
in addition to cleaning things up, removing these spurious rules
allows crti/crtn asm to be omitted by an arch (thereby using the empty
C files instead) if they are not needed.
Natanael Copa [Thu, 7 Dec 2017 16:54:07 +0000 (17:54 +0100)]
use the name UTC instead of GMT for UTC timezone
notes by maintainer:
both C and POSIX use the term UTC to specify related functionality,
despite POSIX defining it as something more like UT1 or historical
(pre-UTC) GMT without leap seconds. neither specifies the associated
string for %Z. old choice of "GMT" violated principle of least
surprise for users and some applications/tests. use "UTC" instead.
Rich Felker [Thu, 14 Dec 2017 23:54:54 +0000 (18:54 -0500)]
fix data race in at_quick_exit
aside from theoretical arbitrary results due to UB, this could
practically cause unbounded overflow of static array if hit, but
hitting it depends on having more than 32 calls to at_quick_exit and
having them sufficiently often.
Timo Teräs [Tue, 22 Nov 2016 08:29:08 +0000 (10:29 +0200)]
implement strftime padding specifier extensions
notes added by maintainer:
the '-' specifier allows default padding to be suppressed, and '_'
allows padding with spaces instead of the default (zeros).
these extensions seem to be included in several other implementations
including FreeBSD and derivatives, and Solaris. while portable
software should not depend on them, time format strings are often
exposed to the user for configurable time display. reportedly some
python programs also use and depend on them.
William Pitcock [Tue, 5 Dec 2017 21:04:43 +0000 (16:04 -0500)]
implement the fopencookie extension to stdio
notes added by maintainer:
this function is a GNU extension. it was chosen over the similar BSD
function funopen because the latter depends on fpos_t being an
arithmetic type as part of its public API, conflicting with our
definition of fpos_t and with the intent that it be an opaque type. it
was accepted for inclusion because, despite not being widely used, it
is usually very difficult to extricate software using it from the
dependency on it.
calling pattern for the read and write callbacks is not likely to
match glibc or other implementations, but should work with any
reasonable callbacks. in particular the read function is never called
without at least one byte being needed to satisfy its caller, so that
spurious blocking is not introduced.
contracts for what callbacks called from inside libc/stdio can do are
always complicated, and at some point still need to be specified
explicitly. at the very least, the callbacks must return or block
indefinitely (they cannot perform nonlocal exits) and they should not
make calls to stdio using their own FILE as an argument.
Rich Felker [Mon, 20 Nov 2017 21:25:54 +0000 (16:25 -0500)]
make fgetwc handling of encoding errors consistent with/without buffer
previously, fgetwc left all but the first byte of an illegal sequence
unread (available for subsequent calls) when reading out of the FILE
buffer, but dropped all bytes contibuting to the error when falling
back to reading a byte at a time. neither behavior was ideal. in the
buffered case, each malformed character produced one error per byte,
rather than one per character. in the unbuffered case, consuming the
last byte that caused the transition from "incomplete" to "invalid"
state potentially dropped (and produced additional spurious encoding
errors for) the next valid character.
to handle both cases uniformly without duplicate code, revise the
buffered case to only cover situations where a complete and valid
character is present in the buffer, and fall back to byte-at-a-time
for all other cases. this allows using mbtowc (stateless) instead of
mbrtowc, which may slightly improve performance too.
when an encoding error has been hit in the byte-at-a-time case, leave
the final byte that produced the error unread (via ungetc) except in
the case of single-byte errors (for UTF-8, bytes c0, c1, f5-ff, and
continuation bytes with no lead byte). single-byte errors are fully
consumed so as not to leave the caller in an infinite loop repeating
the same error.
none of these changes are distinguished from a conformance standpoint,
since the file position is unspecified after encoding errors. they are
intended merely as QoI/consistency improvements.
Rich Felker [Mon, 20 Nov 2017 19:23:49 +0000 (14:23 -0500)]
fix treatment by fgetws of encoding errors as eof
fgetwc does not set the stream's error indicator on encoding errors,
making ferror insufficient to distinguish between error and eof
conditions. feof is also insufficient, since it will return true if
the file ended with a partial character encoding error.
whether fgetwc should be setting the error indicator itself is a
question with conflicting answers. the POSIX text for the function
states it as a requirement, but the ISO C text seems to require that
it not. this may be revisited in the future based on the outcome of
Austin Group issue #1170.
Rich Felker [Wed, 15 Nov 2017 04:47:05 +0000 (23:47 -0500)]
add reverse iconv mappings for JIS-based encodings
these encodings are still commonly used in messaging protocols and
such. the reverse mapping is implemented as a binary search of a list
of the jis 0208 characters in unicode order; the existing forward
table is used to perform the comparison in the search.
Rich Felker [Mon, 13 Nov 2017 23:34:27 +0000 (18:34 -0500)]
generalize iconv framework for 8-bit codepages
previously, 8-bit codepages could only remap the high 128 bytes; the
low range was assumed/forced to agree with ascii. interpretation of
codepage table headers has been changed so that it's possible to
represent mappings for up to 256 slots (fewer if the initial portion
of the map is elided because it coincides with unicode codepoints).
this requires consuming a bit more of the 10-bit space of characters
that can be represented in 8-bit codepages, but there's still a plenty
left. the size of the legacy_chars table is actually reduced now by
eliding the first 256 entries and considering them to map implicitly
via the identity map.
before these changes, there seem to have been minor bugs/omissions in
codepage table generation, so it's likely that some actual bug fixes
are silently included in this commit. round-trip testing of a few
codepages was performed on the new version of the code, but no
differential testing against the old version was done.
Rich Felker [Mon, 13 Nov 2017 20:27:10 +0000 (15:27 -0500)]
fix malloc state corruption when ldso rejects loading a second libc
commit c49d3c8adadfa24235fcf4779bb722b1aa6f480b added logic to detect
attempts to load libc.so via another name and instead redirect to the
existing libc, rather than loading two and producing dangerously
inconsistent state. however, the check for and unmapping of the
duplicate libc happened after reclaim_gaps was already called,
donating the slack space around the writable segment to malloc.
subsequent unmapping of the library then invalidated malloc's free
lists.
fix the issue by moving the call to reclaim_gaps out of map_library
into load_library, after the duplicate libc check but before the first
call to calloc, so that the gaps can still be used to satisfy the
allocation of struct dso. this change also eliminates the need for an
ugly hack (temporarily setting runtime=1) to avoid reclaim_gaps when
loading the main program via map_library, which happens when ldso is
invoked as a command.
only programs/libraries erroneously containing a DT_NEEDED reference
to libc.so via an absolute pathname or symlink were affected by this
issue.
Rich Felker [Sat, 11 Nov 2017 06:32:30 +0000 (01:32 -0500)]
reformat cjk iconv tables to be diff-friendly, match tool output
the new version of the code used to generate these tables forces a
newline every 256 entries, whereas at the time these files were
originally generated and committed, it only wrapped them at 80
columns. the new behavior ensures that localized changes to the
tables, if they are ever needed, will produce localized diffs. other
tables including hkscs were already committed in the new format.
binary comparison of the generated object files was performed to
confirm that no spurious changes slipped in.
Bobby Bingham [Sat, 11 Nov 2017 00:15:43 +0000 (18:15 -0600)]
prevent fork's errno from being clobbered by atfork handlers
If the syscall fails, errno must be set correctly for the caller.
There's no guarantee that the handlers registered with pthread_atfork
won't clobber errno, so we need to ensure it gets set after they are
called.
Rich Felker [Fri, 10 Nov 2017 22:06:32 +0000 (17:06 -0500)]
add iso-2022-jp support (decoding only) to iconv
this implementation aims to match the baseline defined by rfc1468 (the
original mime charset definition) plus the halfwidth katakana
extension included in the whatwg definition of the charset. rejection
of si/so controls and newlines in doublebyte state are not currently
enforced. the jis x 0201 mode is currently interpreted as having the
yen sign and overline character in place of backslash and tilde; ascii
mode has the standard ascii characters in those slots.
Rich Felker [Fri, 10 Nov 2017 20:06:42 +0000 (15:06 -0500)]
add iconv framework for decoding stateful encodings
assuming pointers obtained from malloc have some nonzero alignment,
repurpose the low bit of iconv_t as an indicator that the descriptor
is a stateless value representing the source and destination character
encodings.
Rich Felker [Fri, 10 Nov 2017 18:40:12 +0000 (13:40 -0500)]
simplify/optimize iconv utf-8 case
the special case where mbrtowc returns 0 but consumed 1 byte of input
does not need to be considered, because the short-circuit for low
bytes already covered that case.
Rich Felker [Fri, 10 Nov 2017 18:34:21 +0000 (13:34 -0500)]
handle ascii range individually in each iconv case
short-circuiting low bytes before the switch precluded support for
character encodings that don't coincide with ascii in this range. this
limitation affected iso-2022 encodings, which use the esc byte to
introduce a shift sequence, and things like ebcdic.
Rich Felker [Fri, 10 Nov 2017 05:27:34 +0000 (00:27 -0500)]
move iconv_close to its own translation unit
this is in preparation to support stateful conversion descriptors,
which are necessarily allocated and thus must be freed in iconv_close.
putting it in a separate TU will avoid pulling in free if iconv_close
is not referenced.
this change is made to avoid having assumptions about the encoding
spread out across the file, and to facilitate future change to a form
that can accommodate allocted, stateful descriptors when needed.
this commit should not produce any functional changes; with the
compiler tested the only change to code generation was minor
reordering of local variables on stack.
A. Wilcox [Thu, 14 Sep 2017 20:53:21 +0000 (15:53 -0500)]
fix getaddrinfo error code for non-numeric service with AI_NUMERICSERV
If AI_NUMERICSERV is specified and a numeric service was not provided,
POSIX mandates getaddrinfo return EAI_NONAME. EAI_SERVICE is only for
services that cannot be used on the specified socket type.
Rich Felker [Fri, 10 Nov 2017 00:56:26 +0000 (19:56 -0500)]
fix mismatched type of __pthread_tsd_run_dtors weak definition
commit a6054e3c94aa0491d7366e4b05ae0d73f661bfe2 changed this function
not to take an argument, but the weak definition used by timer_create
was not updated to match.