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The flag 1<<7 is used in several places for different purposes that are
not always easy to distinguish. Mark those usages that correspond to the
flag that is used by the kernel for futexes.
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commit 58e2396a9aa23c132faf4198ca4d779c84955b38 missed that the same
code was duplicated in implementation of vfwprintf.
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while the official elfv2 abi for "powerpc64le" sets power8 as the
baseline isa, we use it for both little and big endian powerpc64
targets and need to maintain compatibility with pre-power8 models. the
instructions for sqrt, fabs, and fma are in the baseline isa; support
for the rest is conditional via predefined isa-level macros.
patch by David Edelsohn.
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these were introduced in z196 and not available in the baseline (z900)
ISA level. use __HTM__ as an alternate indicator for ISA level, since
gcc did not define __ARCH__ until 7.x.
patch by David Edelsohn.
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in arm rtabi these __aeabi_* functions have special abi (they are
only allowed to clobber r0,r1,r2,r3,ip,lr,cpsr), so they cannot
be simple wrappers around normal string functions (which may
clobber other registers), the safest solution is to write them in
asm, a minimalistic implementation works because these are not
supposed to be emitted by compilers or used in general.
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commit 2d7d05f031e014068a61d3076c6178513395d2ae wrongly changed ERANGE
to EINVAL, likely as the result of copy-and-paste error.
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commit 97bd6b09dbe7478d5a90a06ecd9e5b59389d8eb9 refactored the table
lookup into a function and introduced an error in index computation.
the error caused garbage to be read from the table if the given charmap
had a non-zero number of elided entries.
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POSIX requires ctime_r return a null pointer on failure, which can
occur if the input time_t value is not representable in broken down
form.
based on patch by Alexander Monakov.
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these functions return an error code, and are not explicitly
documented to set errno, but they are nonstandard and the historical
implementations do set errno as well, and some applications expect
this behavior. do likewise for compatibility.
patch by Rudolph Pereira.
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ctime passes the result from localtime directly to asctime. But in case
of error, localtime returns 0. This causes an error (NULL pointer
dereference) in asctime.
based on patch by Omer Anson.
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mremap seems to always fail on nommu, and on some non-Linux
implementations of the Linux syscall API, it at least fails to
increase allocation size, and may fail to move (i.e. defragment) the
existing mapping when shrinking it too. instead of failing realloc or
leaving an over-sized allocation that may waste a large amount of
memory, fallback to malloc-memcpy-free if mremap fails.
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POSIX defines getdate error #5 as:
"An I/O error is encountered while reading the template file."
POSIX defines getdate error #7 as:
"There is no line in the template that matches the input."
This change correctly disambiguates between the two error conditions.
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Per 1003.1-2008 (2016 ed.), catopen must set errno on failure.
We set errno to EOPNOTSUPP because musl does not currently support
message catalogues.
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the check to prevent matching empty string wrongly blocked matching
of "/" due to checking emptiness after stripping leading slashes
rather than checking the full original argument string.
simplified from patch by Julien Ramseier.
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when using the sh4a opcodes, the assembler tags the resulting object
file as requiring sh4a. the linker then refuses to (static) link it
with object files marked as requiring j2, since there is no isa level
that includes both sh4a and j2 instructions.
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Make a fast path for ascii chars which is assumed to be the most common
case. This has significant performance benefit on xml json and similar
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The flags argument was missing, causing uninitalized data to be passed
to fchownat(2). The correct value of flags should match the fallback for
chown(3).
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there was missing reverse-conversion logic for the case, handled
specially in the character set tables, where a byte represents a
unicode codepoint with the same value.
this patch adds code to handle the case, and refactors the two-level
10-bit table lookup for legacy character sets into a function to avoid
repeating it yet another time as part of the fix.
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per POSIX, EINVAL is not a mandatory error, only an optional one. but
reporting unsupported flags allows an application to fallback
gracefully when a requested feature is not supported. this is not
helpful now, but it may be in the future if additional flags are
added.
had this checking been present before, applications would have been
able to check for the newly-added POSIX_SPAWN_SETSID feature (added in
commit bb439bb17108b67f3df9c9af824d3a607b5b059d) at runtime.
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this functionality has been adopted for inclusion in the next issue of
POSIX as the result of Austin Group issue #1044.
based on patch by Daurnimator.
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the code being removed was written to optimize for size assuming the
compiler cannot collapse code paths for different types with the same
underlying representation. modern compilers sometimes succeed in
making this optimization themselves, but either way it's a small size
difference and not worth the source-level complexity or the UB
involved in this hack.
some incorrect use of va_arg still remains, particularly use of void *
where the actual argument has a different pointer type. fixing this
requires some actual code additions, rather than just removing cruft,
so I'm leaving it to be done later as a separate commit.
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commit 0a950dcf15bb9f7274c804dca490e9e20e475f3e added checking that
the pathname a tty device was opened with actually matches the device,
which can fail to hold when a container inherits a tty from outside
the container. the error code added at the time was ENOENT; however,
discussions between affected applications and glibc developers
resulted in glibc adopting ENODEV as the error for this condition, and
this has now been documented in the man pages project as well. adopt
the same error code for consistency.
patch by Christian Brauner.
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commit d6cb08bcaca4ff1f921375510ca72bccea969c75 moved the code and
introduced an incorrect string offset for the new parsing, probably
due to a copy-and-paste error.
patch by Stefan Sedich.
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in nearest rounding mode scalbn could introduce double rounding error
when an intermediate value and the final result were both in the
subnormal range e.g.
scalbn(0x1.7ffffffffffffp-1, -1073)
returned 0x1p-1073 instead of 0x1p-1074, because the intermediate
computation got rounded to 0x1.8p-1023.
with the fix an intermediate value can only be in the subnormal range
if the final result is 0 which is correct even after double rounding.
(there still can be two roundings so signals may be raised twice, but
that's only observable with trapping exceptions which is not supported.)
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normally 32-bit archs use the mmap2 syscall and are limited to an
offset of 2^32 pages. however some 32-bit archs (mainly ILP32-on-64
ones like x32) have 64-bit syscall argument slots and thus can accept
the full range. don't artifically limit them.
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analogous to commit 5bf7eba213cacc4c1220627c91c28deff2ffecda, use of
AT_PHDR/PT_PHDR does not actually work to find the program base, and
the method with _DYNAMIC vs PT_DYNAMIC must be used as an alternative.
patch by Shiz, along with testing to confirm that this fixes unwinding
in static PIE.
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due to testing buf[i].family==AF_INET before checking i==cnt, it was
possible to read past the end of the array, or past the valid part. in
practice, without active bounds/indeterminate-value checking by the
compiler, the worst that happened was failure to return early and
optimize out the sorting that's unneeded for v4-only results.
returning on i==cnt-1 rather than i==cnt would be an alternate fix,
but the approach this patch takes is more idiomatic and less
error-prone.
patch by Timo Teräs.
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this should increase performance and reduce code size on aarch64.
the compiled code was checked against using __builtin_* instead
of inline asm with gcc-6.2.0.
lrint is two instructions.
c with inline asm is used because it is safer than a pure asm
implementation, this prevents ll{rint,round} to be an alias
of l{rint,round} (because the types don't match) and depends
on gcc style inline asm support.
ceil, floor, round, trunc can either raise inexact on finite
non-integer inputs or not raise any exceptions. the new
implementation does not raise exceptions while the generic
c code does.
on aarch64, the underflow exception is signaled before rounding
(ieee 754 allows both before and after rounding, but it must be
consistent), the generic fma c code signals it after rounding
so using single instruction fixes a slight conformance issue too.
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in this case, a potentially-uninitialized or unrelated existing value
in tm_year was being used. instead use 0 if %y was not present.
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string pointer was not advanced after matching.
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tm_yday range is 0-365 while %j is 1-366
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With REG_NEWLINE, POSIX says:
"A <newline> in string shall not be matched by a period outside
a bracket expression or by any form of a non-matching list"
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the old limit was one byte too short to support locale names of the
form xx_XX.UTF-8@modifier where modifier is more than 3 bytes, a form
which various real-world locale names take. the problem could be
avoided by omitting the useless ".UTF-8" part, but users may need to
have it present when operating on mixed-libc systems or when it will
be carried over (e.g. across ssh) to other systems.
the new limit is chosen sufficient for existing/reasonable locale
names while still keeping the size of setlocale's static buffer small.
also add locale_impl.h to the Makefile's list of headers which force
rebuild of source files, to prevent dangerously inconsistent object
files from getting used after this change.
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often translations will be named only by language, whereas locale
names may also include a territory code, modifier, and codeset
portion. previously, only translations exactly matching the locale
name were loaded. this was a major usability issue, requiring
workarounds like symlinks or tweaking of the locale name.
with these changes, gettext now searches for translations by first
removing the codeset portion of the locale name, then trying the
remainder in full, with modifier (@mod) removed, with territory code
(_XX) removed, and with both removed.
part of the reason gettext lacked support for searching fallbacks
before is that the candidate pathname for a translation file was
constructed on each call and used as the key to lookup an
already-mapped translation file. this was very costly/inefficient. we
now use the tuple of textdomain binding pointer, locale map pointer,
and integer category id as the key for looking up a translation file
mapping.
based on patch by He X.
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when called for LC_ALL, setlocale has to return a string representing
the state of all locale categories. the simplest way to do this was to
always return a delimited list of values for each category, but that's
not friendly in the fairly common case where all categories have the
same setting. He X proposed a patch to check for this case and return
a single name; this patch is a simplified approach to do the same.
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the time of day at which daylight time switches over is specified in
local time in the dst state prior to the transition. the code for
handling this wrongly assumed it needed to switch whether dst or
standard offset is applied to the transition time when the dst end
date is before the dst start date (souther hemisphere summer), but in
fact the end transition time should always be adjusted for dst, and
the start transition time should always be adjusted for standard time.
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partly following freebsd rev 279491
https://svnweb.freebsd.org/base?view=revision&revision=279491
(musl had some of the fixes before freebsd).
the change should not matter much for j0f, y0f, but it improves
j1f and y1f in [2.5,~3.75] (that is [0x40200000,~0x40700000]).
near roots (e.g. around 3.8317 for j1f) there are still large
ulp errors.
dropped code that tried to raise inexact.
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if the length of the input was equal to the buffer size (128), a fixed
value of zero was written one byte past the end of the static buffer.
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this could only happen if an incomplete auxv was passed into the
program, but it's better to just initialize the data anyway.
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the fix in commit c3edc06d1e1360f3570db9155d6b318ae0d0f0f7 for
CVE-2016-8859 used gotos to exit on overflow conditions, but the code
in that error path assumed the buffer pointer was valid or null. thus,
the conditions which previously led to under-allocation and buffer
overflow could instead lead to an invalid pointer being passed to
free.
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this is not a conformance issue as posix does not specify the
argument order, but the order is specified for bsearch and some
systems document the order for lsearch consistently (openbsd).
since there were two indpendent reports of this issue it's better
to use the more widely expected argument order.
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binutils commit bada43421274615d0d5f629a61a60b7daa71bc15 tightened
immediate fixup handling in gas in such a way that the final .arch of
an object file must be compatible with the fixups used when the
instruction was assembled; this in turn broke assembling of atomics.s,
at least in thumb mode.
it's not clear whether this should be considered a bug in gas, but
.object_arch is preferable anyway for our purpose here of controlling
the ISA level tag on the object file being produced, and it's the
intended directive for use in object files with runtime code
selection. research by Szabolcs Nagy confirmed that .object_arch is
supported in all relevant versions of binutils and clang's integrated
assembler.
patch by Reiner Herrmann.
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This was missed when writing the port initially.
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use the standard strnlen idiom for cases where lengths greater than an
imposed limit are going to be rejected immediately anyway.
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the plural_rule field of allocated msgcat structures was assumed to be
initially-null but was never initialized. for future-proofing, the
nplurals field which was left uninitialized should also be cleared.
likewise, in the binding structure, the active field could be used
uninitialized by a technicality: the a_store which stores the initial
value of 0 may be implemented as a cas operation, which reads the old
value.
rather than fixing these issues individually, just use calloc for both
allocations. this does result in wasteful clearing of name buffers (up
to NAME_MAX+PATH_MAX) before filling them, but since the size if
bounded and the time is dominated by filesystem operations, it really
doesn't matter; simplicity and future-proofing have more value here.
modified from patch submitted by He X.
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this loop was only supposed to deactivate other bindings for the same
text domain name, but due to copy-and-paste error, deactivated all
other bindings.
patch by He X.
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commit 78a8ef47c4d92b7680c52a85f80a81e29da86bb9 inadvertently removed
the SA_RESTART flag from the sigaction for the internal signal handler
used by __synccall for broadcasting. as a result, programs which did
not use interrupting signals but which used set*id() in a
multithreaded context could wrongly observe EINTR errors they're not
prepared to handle.
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