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Internally regcomp needs to copy some iteration nodes before
translating the AST into TNFA representation.
Literal nodes were not copied correctly: the class type and list
of negated class types were not copied so classes were ignored
(in the non-negated case an ignored char class caused the literal
to match everything).
This affects iterations when the upper bound is finite, larger
than one or the lower bound is larger than one. So eg. the EREs
were treated as
The fix is done with minimal source modification to copy the
necessary fields, but the AST preparation and node handling
code of tre will need to be cleaned up for clarity.
(cherry picked from commit c498efe117539a9d40d90b588c033316701c4b3e)
one stop condition for parsing abbreviated ipv6 addressed was missed,
allowing the internal ip buffer to overflow. this patch adds the
missing stop condition and masks the array index so that, in case
there are any remaining stop conditions missing, overflowing the
buffer is not possible.
(cherry picked from commit fc13acc3dcb5b1f215c007f583a63551f6a71363)
the regex parser handles the (undefined) case of an unexpected byte
following a backslash as a literal. however, instead of correctly
decoding a character, it was treating the byte value itself as a
character. this was not only semantically unjustified, but turned out
to be dangerous on archs where plain char is signed: bytes in the
range 252-255 alias the internal codes -4 through -1 used for special
types of literal nodes in the AST.
analogous to commit 39dfd58417ef642307d90306e1c7e50aaec5a35c in
mainline. it's unclear whether the same crash that affected mainline
is possible in the older regcomp code in 1.0.x, but conceptually the
bug is the same.
(cherry picked from commit 380857bf21bcffbbee2fe8ab52feadf39366d7ec)
(cherry picked from commit 91a3bd743e91604bde83e9ce1ad3a2e2d4ff0f0f)
these macros have the same distinct definition on blackfin, frv, m68k,
mips, sparc and xtensa kernels. POLLMSG and POLLRDHUP additionally
differ on sparc.
(cherry picked from commit f5011c62c3329f15652a60b6b2300d7e3f570977)
the malloc init code provided its own version of pthread_once type
logic, including the exact same bug that was fixed in pthread_once in
since this code is called adjacent to expand_heap, which takes a lock,
there is no reason to have pthread_once-type initialization. simply
moving the init code into the interval where expand_heap already holds
its lock on the brk achieves the same result with much less
synchronization logic, and allows the buggy code to be eliminated
rather than just fixed.
(cherry picked from commit 7a81fe3710be0128d29071e76c5acbea3d84277b)
this issue mainly affects PIE binaries and execution of programs via
direct invocation of the dynamic linker binary: depending on kernel
behavior, in these cases the initial brk may be placed at at location
where it cannot be extended, due to conflicting adjacent maps.
when brk fails, mmap is used instead to expand the heap. in order to
avoid expensive bookkeeping for managing fragmentation by merging
these new heap regions, the minimum size for new heap regions
increases exponentially in the number of regions. this limits the
number of regions, and thereby the number of fixed fragmentation
points, to a quantity which is logarithmic with respect to the size of
virtual address space and thus negligible. the exponential growth is
tuned so as to avoid expanding the heap by more than approximately 50%
of its current total size.
(cherry picked from commit 5446303328adf4b4e36d9fba21848e6feb55fab4)
the character sequence '$((' was incorrectly interpreted as the
opening of arithmetic even within single-quoted contexts, thereby
suppressing the checks for bad characters after the closing quote.
presently bad character checking is only performed when the WRDE_NOCMD
is used; this patch only corrects checking in that case.
(cherry picked from commit 594ffed82f4e6ee7da85e9c5da35e32946ae32c9)
mips fesetenv did not handle FE_DFL_ENV, now fcsr is cleared in that
(cherry picked from commit 5fc1487832e16aa2119e735a388d5f36c8c139e2)
in the case where a non-symlink file was replaced by a symlink during
the fchmodat operation with AT_SYMLINK_NOFOLLOW, mode change on the
new symlink target was successfully suppressed, but the error was not
reported. instead, fchmodat simply returned 0.
(cherry picked from commit 61b1d102129990f6e903c6ddcf46c7d79d1a1e99)
(conflicts from commit dd5f50da6f6c3df5647e922e47f8568a8896a752)
(cherry picked from commit 2736eb6caa70bb6e909d7d8ebbe145c2071435e0)
mxcs_mask should be mxcr_mask
(cherry picked from commit 4758f0565df83beb8f9b24857ec40ca3a40d2281)
when using /etc/shadow (rather than tcb) as its backend, getspnam_r
matched any username starting with the caller-provided string rather
than requiring an exact match. in practice this seems to have affected
only systems where one valid username is a prefix for another valid
username, and where the longer username appears first in the shadow
(cherry picked from commit ecb608192a48d3688e1a0a21027bfd968d3301a1)
based on patch by Dima Krasner, with minor improvements for code size.
connect can fail if there is no listening syslogd, in which case a
useless socket was kept open, preventing subsequent syslog call from
attempting to connect again.
(cherry picked from commit c574321d75f035ff6d2c18dfb7e3f70db60ba7bd)
since wint_t is unsigned, WINT_MIN needs to expand to an unsigned zero.
(cherry picked from commit aee9b1526247f74e9b755b50e102b3b4ce2aac1d)
previously, write errors neither stopped further output attempts nor
caused the function to return an error to the caller. this could
result in silent loss of output, possibly in the middle of output in
the event of a non-permanent error.
the simplest solution is temporarily clearing the error flag for the
target stream, then suppressing further output when the error flag is
set and checking/restoring it at the end of the operation to determine
the correct return value.
since the wide version of the code internally calls the narrow fprintf
to perform some of its underlying operations, initial clearing of the
error flag is suppressed when performing a narrow vfprintf on a
wide-oriented stream. this is not a problem since the behavior of
narrow operations on wide-oriented streams is undefined.
(cherry picked from commit d42269d7c85308abdbf8cee38b1a1097249eb38b)
these functions are expected to return an error code rather than
setting errno and returning -1.
(cherry picked from commit 66140b0c926ed097f2cb7474863523e4af351f5b)
the sched_getaffinity syscall only fills a cpu set up to the set size
used/supported by the kernel. the rest is left untouched and userspace
is responsible for zero-filling it based on the return value of the
(cherry picked from commit a56e339419c1a90f8a85f86621f3c73945e07b23)
the new DT_RUNPATH semantics for search order are always used, and
since binutils had always set both DT_RPATH and DT_RUNPATH when the
latter was used, processing only DT_RPATH worked fine. however, recent
binutils has stopped generating DT_RPATH when DT_RUNPATH is used,
which broke support for this feature completely.
(cherry picked from commit d8dc2b7c0289b12eeef4feff65e3c918111b0f55)
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 (188.8.131.52 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)
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)
this was introduced in commit 2da3ab1382ca8e39eb1e4428103764a81fba73d3
as an oversight while making the variadic argument access conditional.
(cherry picked from commit e146e6035fecea080fb17450db3c8bb44d36e07d)
the mode argument is only required to be present when the O_CREAT or
O_TMPFILE flag is used.
(cherry picked from commit 2da3ab1382ca8e39eb1e4428103764a81fba73d3)
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)
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)
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
(cherry picked from commit dccbf4c809efc311aa37da71de70d04dfd8b0db3)
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)
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)
(cherry picked from commit 546f6b322bcafa2452925c19f9607d9689c75f95)
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)
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
(cherry picked from commit 6e2bb7acf42589fb7130b039d0623e2ca42503dd)
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)
Empty name was rejected in dn_expand since commit
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)
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)
(cherry picked from commit d146d4dc1104aa3472daf81d2581aca65df54d13)
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)
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)
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)
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 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
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
(cherry picked from commit f61be1f875a2758509d6e9e2cf6f1d9603b28b65)
(cherry picked from commit 522a0de2101abd12b19a4d2ba5c09abbb7c5fc79)
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
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)
(cherry picked from commit 1456b7ae6b72a4f2c446243acdde7c951268d4ab)
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)
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
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)
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
(cherry picked from commit bb3a3befeaa01531c273ef9130f3fbcaaf8a25e2)
(cherry picked from commit 94252dd341a7c72b31db2614abdc74142ad80562)
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)