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in this case there are two conflicting rules in play: that an explicit
precision of zero with the value zero produces no output, and that the
'#' modifier for octal increases the precision sufficiently to yield a
leading zero. ISO C (7.19.6.1 paragraph 6 in C99+TC3) includes a
parenthetical remark to clarify that the precision-increasing behavior
takes precedence, but the corresponding text in POSIX off of which I
based the implementation is missing this remark.
this issue was covered in WG14 DR#151.
(cherry picked from commit b91cdbe2bc8b626aa04dc6e3e84345accf34e4b1)
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Some early x86_64 cpus (released before 2006) did not support sahf/lahf
instructions so they should be avoided (intel manual says they are only
supported if CPUID.80000001H:ECX.LAHF-SAHF[bit 0] = 1).
The workaround simplifies exp2l and expm1l because fucomip can be
used instead of the fucomp;fnstsw;sahf sequence copied from i386.
In fmodl and remainderl sahf is replaced by a simple bit test.
(cherry picked from commit a732e80d33b4fd6f510f7cec4f5573ef5d89bc4e)
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this was introduced in commit 2da3ab1382ca8e39eb1e4428103764a81fba73d3
as an oversight while making the variadic argument access conditional.
(cherry picked from commit e146e6035fecea080fb17450db3c8bb44d36e07d)
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the mode argument is only required to be present when the O_CREAT or
O_TMPFILE flag is used.
(cherry picked from commit 2da3ab1382ca8e39eb1e4428103764a81fba73d3)
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these functions need to be fast when the init routine has already run,
since they may be called very often from code which depends on global
initialization having taken place. as such, a fast path bypassing
atomic cas on the once control object was used to avoid heavy memory
contention. however, on archs with weakly ordered memory, the fast
path failed to ensure that the caller actually observes the side
effects of the init routine.
preliminary performance testing showed that simply removing the fast
path was not practical; a performance drop of roughly 85x was observed
with 20 threads hammering the same once control on a 24-core machine.
so the new explicit barrier operation from atomic.h is used to retain
the fast path while ensuring memory visibility.
performance may be reduced on some archs where the barrier actually
makes a difference, but the previous behavior was unsafe and incorrect
on these archs. future improvements to the implementation of a_barrier
should reduce the impact.
(cherry picked from commit df37d3960abec482e17fad2274a99b790f6cc08b)
(edited not to depend on a_barrier, which is not available in 1.0.x)
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previously, the hours were considered as a signed quantity while
minutes and seconds were always treated as positive offsets. however,
semantically the '-' sign should negate the whole hh:mm:ss offset.
this bug only affected timezones east of GMT with non-whole-hours
offsets, such as those used in India and Nepal.
(cherry picked from commit 08b996d180323775d5457944eefbb8a51ea72539)
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this function is specified to leave the last byte with "unspecified
disposition" when the length is odd, so for the most part correct
programs should not be calling swab with odd lengths. however, doing
so is permitted, and should not write past the end of the destination
buffer.
(cherry picked from commit dccbf4c809efc311aa37da71de70d04dfd8b0db3)
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patch by Jens Gustedt. this fixes a bug reported by Nadav Har'El. the
underlying issue was that a left-shift by 16 bits after promotion of
unsigned short to int caused integer overflow. while some compilers
define this overflow case as "shifting into the sign bit", doing so
doesn't help; the sign bit then gets extended through the upper bits
in subsequent arithmetic as unsigned long long. this patch imposes a
promotion to unsigned prior to the shift, so that the result is
well-defined and matches the specified behavior.
(cherry picked from commit 05cef96d9e63a00b319f88343cf9869c8e612843)
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incorrect behavior occurred only in cases where the input overflows
unsigned long long, not just the (possibly lower) range limit for the
result type. in this case, processing of the '-' sign character was
not suppressed, and the function returned a value of 1 despite setting
errno to ERANGE.
(cherry picked from commit e2e1bb81485a37321d928a8d8b63f40b9d8fa228)
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(cherry picked from commit 546f6b322bcafa2452925c19f9607d9689c75f95)
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this error resulted in an out-of-bounds read, as opposed to a reported
error, when calling the function with an argument one greater than the
max valid index.
(cherry picked from commit 3bed89aa7456d9fe30e550cb5e21f8911036695b)
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previously, fgets, fputs, fread, and fwrite completely omitted locking
and access to the FILE object when their arguments yielded a zero
length read or write operation independent of the FILE state. this
optimization was invalid; it wrongly skipped marking the stream as
byte-oriented (a C conformance bug) and exposed observably missing
synchronization (a POSIX conformance bug) where one of these functions
could wrongly complete despite another thread provably holding the
lock.
(cherry picked from commit 6e2bb7acf42589fb7130b039d0623e2ca42503dd)
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the C standard requires that "the contents of the array remain
unchanged" in this case.
this patch also changes the behavior on read errors, but in that case
"the array contents are indeterminate", so the application cannot
inspect them anyway.
(cherry picked from commit 402611c3ba3be5b3b0486835d98e22ac7ced2722)
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Empty name was rejected in dn_expand since commit
56b57f37a46dab432247bf29d96fcb11fbd02a6d
which is a regression as reported by Natanael Copa.
Furthermore if an offset pointer in a compressed name
pointed to a terminating 0 byte (instead of a label)
the returned name was not null terminated.
(cherry picked from commit 49d2c8c6bcf8c926e52c7f510033b6adc31355f5)
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the subsequent code in pthread_create and the code which copies TLS
initialization images to the new thread's TLS space assume that the
memory provided to them is zero-initialized, which is true when it's
obtained by pthread_create using mmap. however, when the caller
provides a stack using pthread_attr_setstack, pthread_create cannot
make any assumptions about the contents. simply zero-filling the
relevant memory in this case is the simplest and safest fix.
(cherry picked from commit a6293285e930dbdb0eff47e29b513ca22537b1a2)
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(cherry picked from commit d146d4dc1104aa3472daf81d2581aca65df54d13)
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these were removed from the standard but still offered as an extension
in langinfo.h, so nl_langinfo should support them.
(cherry picked from commit 0206f596d5156af560e8af10e950d3cb2f29b73d)
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due to a skipped slot and missing null terminator, the last few
strings were off by one or two slots from their item codes.
(cherry picked from commit a19cd2b64aabee4ae3c80bcf4ba8da26fba560e4)
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due to what was essentially a copy and paste error, the changes made
in commit f61be1f875a2758509d6e9e2cf6f1d9603b28b65 caused syscalls
with 5 or 6 arguments (and syscalls with 2, 3, or 4 arguments when
compiled with clang compatibility) to negate the returned error code a
second time, breaking errno reporting.
(cherry picked from commit 1312930f9bdea47006a8a8c8509c0bed5cf69e85)
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the mips version of this structure on the kernel side wrongly has
32-bit type rather than 64-bit type. fortunately there is adjacent
padding to bring it up to 64 bits, and on little-endian, this allows
us to treat the adjacent kernel st_dev and st_pad0[0] as as single
64-bit dev_t. however, on big endian, such treatment results in the
upper and lower 32-bit parts of the dev_t value being swapped. for the
purpose of just comparing st_dev values this did not break anything,
but it precluded actually processing the device numbers as major/minor
values.
since the broken kernel behavior that needs to be worked around is
isolated to one arch, I put the workarounds in syscall_arch.h rather
than adding a stat fixup path in the common code. on little endian
mips, the added code optimizes out completely.
the changes necessary were incompatible with the way the __asm_syscall
macro was factored so I just removed it and flattened the individual
__syscallN functions. this arguably makes the code easier to read and
understand, anyway.
(cherry picked from commit f61be1f875a2758509d6e9e2cf6f1d9603b28b65)
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(cherry picked from commit 522a0de2101abd12b19a4d2ba5c09abbb7c5fc79)
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as far as I can tell, microblaze is strongly ordered, but this does
not seem to be well-documented and the assumption may need revisiting.
even with strong ordering, however, a volatile C assignment is not
sufficient to implement atomic store, since it does not preclude
reordering by the compiler with respect to non-volatile stores and
loads.
simply flanking a C store with empty volatile asm blocks with memory
clobbers would achieve the desired result, but is likely to result in
worse code generation, since the address and value for the store may
need to be spilled. actually writing the store in asm, so that there's
only one asm block, should give optimal code generation while
satisfying the requirement for having a compiler barrier.
(cherry picked from commit 884cc0c7e253601b96902120ed689f34d12f8aa0)
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(cherry picked from commit 1456b7ae6b72a4f2c446243acdde7c951268d4ab)
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previously I had wrongly assumed the ll/sc instructions also provided
memory synchronization; apparently they do not. this commit adds sync
instructions before and after each atomic operation and changes the
atomic store to simply use sync before and after a plain store, rather
than a useless compare-and-swap.
(cherry picked from commit bcad48439494820989f5867c3f8ccfa6aae2909f)
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despite lacking the semantic content that the asm accesses the
pointed-to object rather than just using its address as a value, the
mips asm was not actually broken. the asm blocks were declared
volatile, meaning that the compiler must treat them as having unknown
side effects.
however changing the asm to use memory constraints is desirable not
just from a semantic correctness and consistency standpoint, but also
produces better code. the compiler is able to use base/offset
addressing expressions for the atomic object's address rather than
having to load the address into a single register. this improves
access to global locks in static libc, and access to non-zero-offset
atomic fields in synchronization primitives, etc.
(cherry picked from commit a294f539c78c6ba0a2786ef3c5b2a1210a33864e)
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due to a mistake in my testing procedure, the changes in the previous
commit were not correctly tested and wrongly assumed to be valid. the
lwarx and stwcx. instructions do not accept general ppc memory address
expressions and thus the argument associated with the memory
constraint cannot be used directly.
instead, the memory constraint can be left as an argument that the asm
does not actually use, and the address can be provided in a separate
register constraint.
(cherry picked from commit bb3a3befeaa01531c273ef9130f3fbcaaf8a25e2)
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(cherry picked from commit 94252dd341a7c72b31db2614abdc74142ad80562)
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the register constraint for the address to be accessed did not convey
that the asm can access the pointed-to object. as far as the compiler
could tell, the result of the asm was just a pure function of the
address and the values passed in, and thus the asm could be hoisted
out of loops or omitted entirely if the result was not used.
(cherry picked from commit 7fdae458bd421046a300a69dcb32953ac9450136)
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the erroneous definition was missed because with works with qemu
user-level emulation, which also has the wrong definition. the actual
kernel uses the asm-generic generic definition.
(cherry picked from commit d69ab5b3686acf75fdf5db6fad19c2c6a510bb4f)
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per POSIX, the nmatch and pmatch arguments are ignored when the regex
was compiled with REG_NOSUB.
(cherry picked from commit 72ed3d47e567b1635a35d3c1d174c8a8b2787e30)
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previously we detected this bug in configure and issued advice for a
workaround, but this turned out not to work. since then gcc 4.9.0 has
appeared in several distributions, and now 4.9.1 has been released
without a fix despite this being a wrong code generation bug which is
supposed to be a release-blocker, per gcc policy.
since the scope of the bug seems to affect only data objects (rather
than functions) whose definitions are overridable, and there are only
a very small number of these in musl, I am just changing them from
const to volatile for the time being. simply removing the const would
be sufficient to make gcc 4.9.1 work (the non-const case was
inadvertently fixed as part of another change in gcc), and this would
also be sufficient with 4.9.0 if we forced -O0 on the affected files
or on the whole build. however it's cleaner to just remove all the
broken compiler detection and use volatile, which will ensure that
they are never constant-folded. the quality of a non-broken compiler's
output should not be affected except for the fact that these objects
are no longer const and thus possibly add a few bytes to data/bss.
this change can be reconsidered and possibly reverted at some point in
the future when the broken gcc versions are no longer relevant.
(cherry picked from commit a6adb2bcd8145353943377d6119c1d7a4242bae1)
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the purpose of this logic is to avoid linking __stdio_exit unless any
stdio reads (which might require repositioning the file offset at exit
time) or writes (which might require flushing at exit time) could have
been performed.
previously, exit called two wrapper functions for __stdio_exit named
__flush_on_exit and __seek_on_exit. both of these functions actually
performed both tasks (seek and flushing) by calling the underlying
__stdio_exit. in order to avoid doing this twice, an overridable data
object __towrite_used was used to cause __seek_on_exit to act as a nop
when __towrite was linked.
now, exit only makes one call, directly to __stdio_exit. this is
satisfiable by a weak dummy definition in exit.c, but the real
definition is pulled in by either __toread.c or __towrite.c through
their referencing a symbol which is defined only in __stdio_exit.c.
(cherry picked from commit c463e11eda8326aacee2ac1d516954a9574a2dcd)
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errno must be saved upon vsyslog entry, otherwise its value could be
changed by some libc function before reaching the %m handler in
vsnprintf.
(cherry picked from commit da27118157c2942d7652138b8d8b0056fc8f872f)
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(cherry picked from commit 349381aa8c0fc385e54e1068dd5f2b27af55cd12)
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r24 was wrongly being saved at a misaligned offset of 30 rather than
the correct offset of 40 in the jmp_buf. the exact effects of this
error have not been studied, but it's clear that the value of r24 was
lost across setjmp/longjmp and the saved values of r21 and/or r22 may
also have been corrupted.
(cherry picked from commit 729673689c3e78803ddfdac2ca6be5a5b80e124a)
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1. failure to output a newline after the password is read
2. fd leaks via missing FD_CLOEXEC
3. fd leaks via failure-to-close when any of the standard streams are
closed at the time of the call
4. wrongful fallback to use of stdin when opening /dev/tty fails
5. wrongful use of stderr rather than /dev/tty for prompt
6. failure to report error reading password
(cherry picked from commit ea496d6c63ecbb5ea475111808e5c0f799354450)
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in some cases, these functions internally call a byte-based input or
output function before calling getwc/putwc, so they cannot rely on the
latter to set the orientation.
(cherry picked from commit 984c25b74da085c6ae6b44a87bbd5f8afc9be331)
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when the orientation of the stream was already set, fwide was
incorrectly returning its argument (the requested orientation) rather
than the actual orientation of the stream.
(cherry picked from commit ebd8142a6ae19db1a5440d11c01afc7529eae0cd)
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these functions were setting wc to point to wchar_t aliasing itself as
a "cheap" way to support null wc arguments. doing so was anything but
cheap, since even without the aliasing violation, it would limit the
compiler's ability to optimize.
making wc point to a dummy object is equally easy and does not suffer
from the above problems.
(cherry picked from commit e89cfe51d2001af08fc2a13e5133ba8157f90beb)
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this issue affected the prioritynames and facilitynames arrays which
are only provided when requested (usually by syslogd implementations)
and which are presently defined as compound literals. the aliasing
violation seems to have been introduced as a workaround for bad
behavior by gcc's -Wwrite-strings option, but it caused compilers to
completely optimize out the contents of prioritynames and
facilitynames since, under many usage cases, the aliasing rules prove
that the contents are never accessed.
(cherry picked from commit 70d9c303b3115ab0fe6060ba0f7b0e4c0a2320b7)
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the logic for this loop was copied from null-terminated-string logic
in strstr without properly adapting it to work with explicit lengths.
presumably this error could result in false negatives (wrongly
comparing past the end of the needle/haystack), false positives
(stopping comparison early when the needle contains null bytes), and
crashes (from runaway reads past the end of mapped memory).
(cherry picked from commit cef0f289f666b6c963bfd11537a6d80916ff889e)
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processing of R_PPC_TPREL32 was ignoring the addend provided by the
RELA-style relocation and instead using the inline value as the
addend. this presumably broke dynamic-linked access to initial TLS in
cases where the addend was nonzero.
(cherry picked from commit 94cf991bf4b18bb87a15a96e7b5e7d92fab787ba)
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(cherry picked from commit 4e5c7a2176773c9a1564c6603240337b3ad6b496)
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this change is harmless and allows commit
a6adb2bcd8145353943377d6119c1d7a4242bae1 to apply without conflicts.
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according to the documentation in the man pages, the GNU extension
functions gethostbyaddr_r, gethostbyname_r and gethostbyname2_r are
guaranteed to set the result pointer to NULL in case of error or no
result.
corresponds to commit fe82bb9b921be34370e6b71a1c6f062c20999ae0 in
master branch.
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Due to an error introduced in commit fcc522c92335783293ac19df318415cd97fbf66b,
checking of the remaining output buffer space was not performed correctly,
allowing malformed input to write past the end of the buffer.
In addition, the loop detection logic failed to account for the possibility
of infinite loops with no output, which would hang the function.
The output size is now limited more strictly so only names with valid length
are accepted.
(cherry picked from commit b3d9e0b94ea73c68ef4169ec82c898ce59a4e30a)
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the service and protocol functions are defined also in other files,
and the protocol ones are actually non-nops elsewhere, so the weak
definitions in ent.c could have prevented the strong definitions from
getting pulled in and used in some static programs.
(cherry picked from commit 934aa1350b96461f205ad69c95e8f6f035f6b62c)
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the return value is unsigned, so negative results for "errors" do not
make sense; 0 is the value reserved for when the interface name does
not exist.
(cherry picked from commit 8041af59881219c32267c3491bee43591d3c3fe6)
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