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2020-02-05remove legacy time32 timer[fd] syscalls from public syscall.hRich Felker10-36/+52
this extends commit 5a105f19b5aae79dd302899e634b6b18b3dcd0d6, removing timer[fd]_settime and timer[fd]_gettime. the timerfd ones are likely to have been used in software that started using them before it could rely on libc exposing functions.
2020-02-05remove further legacy time32 clock syscalls from public syscall.hRich Felker10-36/+52
this extends commit 5a105f19b5aae79dd302899e634b6b18b3dcd0d6, removing clock_settime, clock_getres, clock_nanosleep, and settimeofday.
2020-02-05fix incorrect results for catanf and catanl with some inputsRich Felker2-26/+2
catan was fixed in 10e4bd3780050e75b72aac5d85c31816419bb17d but the same bug in catanf and catanl was overlooked. the patch is completely analogous.
2020-02-04move riscv64 register index constants to signal.hRich Felker2-6/+9
under _GNU_SOURCE for namespace cleanliness, analogous to other archs. the original placement in sys/reg.h seems not to have been motivated; such a header isn't even present on other implementations.
2020-01-30remove legacy clock_gettime and gettimeofday from public syscall.hRich Felker10-18/+25
some nontrivial number of applications have historically performed direct syscalls for these operations rather than using the public functions. such usage is invalid now that time_t is 64-bit and these syscalls no longer match the types they are used with, and it was already harmful before (by suppressing use of vdso). since syscall() has no type safety, incorrect usage of these syscalls can't be caught at compile-time. so, without manually inspecting or running additional tools to check sources, the risk of such errors slipping through is high. this patch renames the syscalls on 32-bit archs to clock_gettime32 and gettimeofday_time32, so that applications using the original names will fail to build without being fixed. note that there are a number of other syscalls that may also be unsafe to use directly after the time64 switchover, but (1) these are the main two that seem to be in widespread use, and (2) most of the others continue to have valid usage with a null timeval/timespec argument, as the argument is an optional timeout or similar.
2020-01-29fix misleading use of _POSIX_VDISABLE in sys/ttydefaults.hRich Felker1-5/+0
_POSIX_VDISABLE is only visible if unistd.h has already been included, so conditional use of it here makes no sense. the value is always 0 anyway; it does not vary.
2020-01-29fix unprotected macro argument in sys/ttydefaults.hRich Felker1-1/+1
2020-01-27math/x32: correct lrintl.s for 32-bit longAlexander Monakov1-2/+2
2020-01-25move struct dirent to bits header, allow NAME_MAX to varyRich Felker3-12/+15
this is not necessary for linux but is a simple, inexpensive change to make that facilitates ports to systems where NAME_MAX needs to be longer.
2020-01-22fix riscv64 a_cas inline asm operand sign extensionLuís Marques1-1/+1
This patch adds an explicit cast to the int arguments passed to the inline asm used in the RISC-V's implementation of `a_cas`, to ensure that they are properly sign extended to 64 bits. They aren't automatically sign extended by Clang, and GCC technically also doesn't guarantee that they will be sign extended.
2020-01-20fix incorrect escaping in add-cfi.*.awk scriptsWill Dietz2-2/+2
gawk 5 complains.
2020-01-16add thumb2 support to arm assembler memcpyAndre McCurdy2-6/+9
For Thumb2 compatibility, replace two instances of a single instruction "orr with a variable shift" with the two instruction equivalent. Neither of the replacements are in a performance critical loop.
2020-01-15fix incorrect __hwcap seen in dynamic-linked __set_thread_areaRich Felker1-1/+1
the bug fixed in commit b82cd6c78d812d38c31febba5a9e57dbaa7919c4 was mostly masked on arm because __hwcap was zero at the point of the call from the dynamic linker to __set_thread_area, causing the access to libc.auxv to be skipped and kuser_helper versions of TLS access and atomics to be used instead of the armv6 or v7 versions. however, on kernels with kuser_helper removed for hardening it would crash. since __set_thread_area potentially uses __hwcap, it must be initialized before the function is called. move the AT_HWCAP lookup from stage 3 to stage 2b.
2020-01-11define RLIMIT_RTTIME, bump RLIMIT_NLIMITSLeah Neukirchen1-1/+2
This macro exists since Linux 2.6.25 and is defined in glibc since 2011.
2020-01-01fix wcwidth wrongly returning 0 for most of planes 4 and upRich Felker1-1/+1
commit 1b0ce9af6d2aa7b92edaf3e9c631cb635bae22bd introduced this bug back in 2012 and it was never noticed, presumably since the affected planes are essentially unused in Unicode.
2020-01-01unconditonally define alloca as __builtin_allocaMichael Forney1-2/+0
This enables alternative compilers, which may not define __GNUC__, to implement alloca, which is still fairly widely used. This is similar to how stdarg.h already works in musl; compilers must implement __builtin_va_arg, there is no fallback definition.
2020-01-01update COPYRIGHT yearRich Felker1-1/+1
2020-01-01remove gratuitous aligned attribute from __ptrace_syscall_infoRich Felker1-1/+2
this change was discussed on the mailing list thread for the linux uapi v5.3 patches, and submitted as a v2 patch, but overlooked when I applied the patches much later. revert commit f291c09ec90e2514c954020e9b9bdb30e2adfc7f and apply the v2 as submitted; the net change is just padding. notes by Szabolcs Nagy follow: compared to the linux uapi (and glibc) a padding is used instead of aligned attribute for keeping the layout the same across targets, this means the alignment of the struct may be different on some targets (e.g. m68k where uint64_t is 2 byte aligned) but that should not affect syscalls and this way the abi does not depend on nonstandard extensions.
2020-01-01fix fdpic regression in dynamic linker with overly smart compilersRich Felker1-2/+8
at least gcc 9 broke execution of DT_INIT/DT_FINI for fdpic archs (presently only sh) by recognizing that the stores to the compound-literal function descriptor constructed to call them were dead stores. there's no way to make a "may_alias function", so instead launder the descriptor through an asm-statement barrier. in practice just making the compound literal volatile seemed to have worked too, but this should be less of a hack and more accurately convey the semantics of what transformations are not valid.
2019-12-31fix crashing ldso on archs where __set_thread_area examines auxvRich Felker1-13/+13
commit 1c84c99913bf1cd47b866ed31e665848a0da84a2 moved the call to __init_tp above the initialization of libc.auxv, inadvertently breaking archs where __set_thread_area examines auxv for the sake of determining the TLS/atomic model needed at runtime. this broke armv6 and sh2.
2019-12-31move stage3_func typedef out of shared internal dynlink.h headerRich Felker2-1/+2
this interface contract is entirely internal to dynlink.c.
2019-12-30mips: add clone3 syscall numbers from linux v5.4Szabolcs Nagy3-0/+3
the syscall numbers were reserved in v5.3 but not wired up on mips, see linux commit 0671c5b84e9e0a6d42d22da9b5d093787ac1c5f3 MIPS: Wire up clone3 syscall
2019-12-30mips: add hwcap bits from linux v5.4Szabolcs Nagy1-0/+11
mips application specific isa extensions were previously not exported in hwcaps so userspace could not apply optimized code at runtime. linux commit 38dffe1e4dde1d3174fdce09d67370412843ebb5 MIPS: elf_hwcap: Export userspace ASEs
2019-12-30sys/wait.h: add P_PIDFD from linux v5.4Szabolcs Nagy1-1/+2
allows waiting on a pidfd, in the future it might allow retrieving the exit status by a non-parent process, see linux commit 3695eae5fee0605f316fbaad0b9e3de791d7dfaf pidfd: add P_PIDFD to waitid()
2019-12-30netinet/tcp.h: add new tcp_info fields from linux v5.4Szabolcs Nagy1-0/+2
tcpi_rcv_ooopack for tracking connection quality: linux commit f9af2dbbfe01def62765a58af7fbc488351893c3 tcp: Add TCP_INFO counter for packets received out-of-order tcpi_snd_wnd peer window size for diagnosing tcp performance problems: linux commit 8f7baad7f03543451af27f5380fc816b008aa1f2 tcp: Add snd_wnd to TCP_INFO
2019-12-30sys/prctl.h: add PR_*_TAGGED_ADDR_* from linux v5.4Szabolcs Nagy1-0/+4
per thread prctl commands to relax the syscall abi such that top bits of user pointers are ignored in the kernel. this allows the use of those bits by hwasan or by mte to color pointers and memory on aarch64: linux commit 63f0c60379650d82250f22e4cf4137ef3dc4f43d arm64: Introduce prctl() options to control the tagged user addresses ABI
2019-12-30sys/mman.h: add MADV_COLD and MADV_PAGEOUT from linux v5.4Szabolcs Nagy1-0/+2
These were mainly introduced so android can optimize the memory usage of unused apps. MADV_COLD hints that the memory range is currently not needed (unlike with MADV_FREE the content is not garbage, it needs to be swapped): linux commit 9c276cc65a58faf98be8e56962745ec99ab87636 mm: introduce MADV_COLD MADV_PAGEOUT hints that the memory range is not needed for a long time so it can be reclaimed immediately independently of memory pressure (unlike with MADV_DONTNEED the content is not garbage): linux commit 1a4e58cce84ee88129d5d49c064bd2852b481357 mm: introduce MADV_PAGEOUT
2019-12-30add clone3 syscall number from linux v5.3Szabolcs Nagy11-0/+12
the syscall number is reserved on all targets, but it is not wired up on all targets, see linux commit 8f6ccf6159aed1f04c6d179f61f6fb2691261e84 Merge tag 'clone3-v5.3' of ... brauner/linux linux commit 8f3220a806545442f6f26195bc491520f5276e7c arch: wire-up clone3() syscall linux commit 7f192e3cd316ba58c88dfa26796cf77789dd9872 fork: add clone3
2019-12-30add pidfd_open syscall number from linux v5.3Szabolcs Nagy16-0/+16
see linux commit 7615d9e1780e26e0178c93c55b73309a5dc093d7 arch: wire-up pidfd_open() linux commit 32fcb426ec001cb6d5a4a195091a8486ea77e2df pid: add pidfd_open()
2019-12-30sys/ptrace.h: add PTRACE_GET_SYSCALL_INFO from linux v5.3Szabolcs Nagy1-0/+28
ptrace API to get details of the syscall the tracee is blocked in, see linux commit 201766a20e30f982ccfe36bebfad9602c3ff574a ptrace: add PTRACE_GET_SYSCALL_INFO request the align attribute was used to keep the layout the same across targets e.g. on m68k uint32_t is 2 byte aligned, this helps with compat ptrace.
2019-12-30sys/socket.h: add SO_DETACH_REUSEPORT_BPF from linux v5.3Szabolcs Nagy1-0/+1
see linux commit 99f3a064bc2e4bd5fe50218646c5be342f2ad18c bpf: net: Add SO_DETACH_REUSEPORT_BPF
2019-12-30netinet/if_ether.h: add ETH_P_LLDP from linux v5.3Szabolcs Nagy1-0/+1
see linux commit c54c2c72b2b90a3ba61b8cad032a578ce2bf5b35 net: Add a define for LLDP ethertype
2019-12-30netinet/tcp.h: add TCP_TX_DELAY from linux v5.3Szabolcs Nagy1-0/+1
see linux commit a842fe1425cb20f457abd3f8ef98b468f83ca98b tcp: add optional per socket transmit delay
2019-12-30fix types for mips sigcontext/mcontext_t regset membersKhem Raj1-2/+6
2019-12-22spare archs without time32 legacy the cost of ioctl fallback conversionsRich Felker1-1/+1
adding this condition makes the entire convert_ioctl_struct function and compat_map table statically unreachable, and thereby optimized out by dead code elimination, on archs where they are not needed.
2019-12-22add further ioctl time64 fallback conversion for device-specific commandRich Felker1-0/+3
VIDIOC_OMAP3ISP_STAT_REQ is a device-specific command for the omap3isp video device. the command number is in a device-private range and therefore could theoretically be used by other devices too in the future, but problematic clashes should not be able to arise without intentional misuse.
2019-12-22add uapi guards for new netinet/ip.h conflict with struct iphdrA. Wilcox1-0/+2
This ensures that the musl definition of 'struct iphdr' does not conflict with the Linux kernel UAPI definition of it. Some software, i.e. net-tools, will not compile against 5.4 kernel headers without this patch and the corresponding Linux kernel patch.
2019-12-22adjust utmpx struct layout for time64, 32-/64-bit arch compatRich Felker1-1/+6
since time64 switchover has changed the size and layout of the struct anyway, take the opportunity to fix it up so that it can be shared between 32- and 64-bit ABIs on the same system as long as byte order matches. the ut_type member is explicitly padded to make up for m68k having only 2-byte alignment; explicit padding has no effect on other archs. ut_session is changed from long to int, with endian-matched padding. this affects 64-bit archs as well, but brings the type into alignment with glibc's x86_64 struct, so it should not break software, and does not break on-disk format. the semantic type is int (pid-like) anyway. the padding produces correct alignment for the ut_tv member on 32-bit archs that don't naturally align it, so that ABI matches 64-bit. this type is presently not used anywhere in the ABI between libc and libc consumers; it's only used between pairs of consumers if a third-party utmp library using the system utmpx.h is in use.
2019-12-22fix elf_prstatus regression on time64, existing wrong definition on x32Rich Felker1-4/+3
the elf_prstatus structure is used in core dumps, and the timeval structures in it are longs matching the elf class, *not* the kernel "old timeval" for the arch. this means using timeval here for x32 was always wrong, despite kernel uapi headers and glibc also exposing it this way, and of course it's wrong for any arch with 64-bit time_t. rather than just changing the type on affected archs, use a tagless struct containing long tv_sec and tv_usec members in place of the timevals. this intentionally breaks use of them as timevals (e.g. assignment, passing address, etc.) on 64-bit archs as well so that any usage unsafe for 32-bit archs is caught even in software that only gets tested on 64-bit archs. from what I could gather, there is not any software using these members anyway. the only reason they need to be fixed to begin with is that the only members which are commonly used, the saved registers, follow the time members and have the wrong offset if the time members are sized incorrectly.
2019-12-21don't continue looping through ioctl compat_map after finding matchRich Felker1-0/+1
there's only one matching entry for any given command so this had no functional distinction, but additional loops are pointless and wasteful.
2019-12-20revert unwanted and inadvertent change that slipped into mmap.cRich Felker1-1/+0
commit ae388becb529428ac926da102f1d025b3c3968da accidentally introduced #define SYSCALL_NO_TLS 1 in mmap.c, which was probably a stale change left around from unrelated syscall timing measurements. reverse it.
2019-12-20add further ioctl time64 fallback conversionsRich Felker1-1/+49
this commit covers all remaining ioctls I'm aware of that use time_t-derived types in their interfaces. it may still be incomplete, and has undergone only minimal testing for a few commands used in audio playback. the SNDRV_PCM_IOCTL_SYNC_PTR command is special-cased because, rather than the whole structure expanding, it has two substructures each padded to 64 bytes that expand within their own 64-byte reserved zone. as long as it's the only one of its type, it doesn't really make sense to make a general framework for it, but the existing table framework is still used for the substructures in the special-case. one of the substructures, snd_pcm_mmap_status, has a snd_pcm_uframes_t member which is not a timestamp but is expanded just like one, to match the 64-bit-arch version of the structure. this is handled just like a timestamp at offset 8, and is the motivation for the conversions table holding offsets of individual values to be expanded rather than timespec/timeval type pairs. for some of the types, the size to which they expand is dependent on whether the arch's ABI aligns 8-byte types on 8-byte boundaries. new_req entries in the table need to reflect this size to get the right ioctl request number that will match what callers pass, but we don't have access to the actual structure type definitions here and duplicating them would be cumbersome. instead, the new_misaligned macro introduced here constructs an artificial object whose size is the result of expanding a misaligned timespec/timeval to 64-bit and imposing the arch's alignment on the result, which can be passed to the _IO{R,W,WR} macros.
2019-12-19improve ioctl time64 conversion fallback frameworkRich Felker1-17/+18
record offsets of individual slots that expand from 32- to 64-bit, rather than timespec/timeval pairs. this flexibility will be needed for some ioctls. reduce size of types in table. adjust representation of offsets to include a count rather than needing -1 padding so that the table is less ugly and doesn't need large diffs if we increase max number of slots.
2019-12-18convert ioctl time64 fallbacks to table-driven frameworkRich Felker1-17/+66
with the current set of supported ioctls, this conversion is hardly an improvement, but it sets the stage for being able to do alsa, v4l2, ppp, and other ioctls with timespec/timeval-derived types. without this capability, a lot of functionality users depend on would stop working with the time64 switchover.
2019-12-18fix regression in ioctl definitions provided by arch/generic bitsRich Felker1-0/+1
commit b60fdf133c033d4ad6b04a8237f253563fae5928 broke the SIOCGSTAMP[NS] ioctl fallbacks introduced in commit 2e554617e5a6a41bf3f6c6306c753cd53abf728c, as well as use of these ioctls, by creating a situation where bits/ioctl.h could be included without __LONG_MAX being visible.
2019-12-17hook recvmmsg up to SO_TIMESTAMP[NS] fallback for pre-time64 kernelsRich Felker2-6/+14
always try the time64 syscall first since we can use its success to conclude that no conversion is needed (any setsockopt for the timestamp options would have succeeded without need for fallbacks). otherwise, we have to remember the original controllen for each msghdr, requiring O(vlen) space, so vlen must be bounded. linux clamps it to IOV_MAX for sendmmsg only (not recvmmsg), but doing the same for recvmmsg is not unreasonable, especially since the limitation will only apply to old kernels. we could optimize to avoid trying SYS_recvmmsg_time64 first if all msghdrs have controllen zero, or support unlimited vlen by looping and emulating the timeout logic, but I'm not inclined to do complex and error-prone optimizations on a function that has so many underlying problems it should really never be used.
2019-12-17implement SO_TIMESTAMP[NS] fallback for kernels without time64 versionsRich Felker5-0/+71
the definitions of SO_TIMESTAMP* changed on 32-bit archs in commit 38143339646a4ccce8afe298c34467767c899f51 to the new versions that provide 64-bit versions of timeval/timespec structure in control message payload. socket options, being state attached to the socket rather than function calls, are not trivial to implement as fallbacks on ENOSYS, and support for them was initially omitted on the assumption that the ioctl-based polling alternatives (SIOCGSTAMP*) could be used instead by applications if setsockopt fails. unfortunately, it turns out that SO_TIMESTAMP is sufficiently old and widely supported that a number of applications assume it's available and treat errors as fatal. this patch introduces emulation of SO_TIMESTAMP[NS] on pre-time64 kernels by falling back to setting the "_OLD" (time32) versions of the options if the time64 ones are not recognized, and performing translation of the SCM_TIMESTAMP[NS] control messages in recvmsg. since recvmsg does not know whether its caller is legacy time32 code or time64, it performs translation for any SCM_TIMESTAMP[NS]_OLD control messages it sees, leaving the original time32 timestamp as-is (it can't be rewritten in-place anyway, and memmove would be mildly expensive) and appending the converted time64 control message at the end of the buffer. legacy time32 callers will see the converted one as a spurious control message of unknown type; time64 callers running on pre-time64 kernels will see the original one as a spurious control message of unknown type. a time64 caller running on a kernel with native time64 support will only see the time64 version of the control message. emulation of SO_TIMESTAMPING is not included at this time since (1) applications which use it seem to be prepared for the possibility that it's not present or working, and (2) it can also be used in sendmsg control messages, in a manner that looks complex to emulate completely, and costly even when running on a time64-supporting kernel. corresponding changes in recvmmsg are not made at this time; they will be done separately.
2019-12-17signal to kernel headers that time_t is 64-bitRich Felker1-0/+1
linux/input.h and perhaps others use this macro to determine whether the userspace time_t is 64-bit when potentially defining types in terms of time_t and derived structures. the name __USE_TIME_BITS64 is unfortunate; it really should have been in the __UAPI namespace. but this is what was chosen back in v4.16 when first preparing input.h for time64 userspace, presumably based on expectations about what the glibc-internal features.h macro for time64 would be, and changing it now would just put a new minimum version requirement on kernel headers. the __USE_TIME_BITS64 macro is not intended as a public interface. it is purely an internal contract between libc and Linux uapi headers.
2019-12-08fix null pointer dereference in setitimer time32 compat shimRich Felker1-4/+6
this interface permits a null pointer for where to store the old itimerval being replaced. an early version of the time32 compat shim code had corresponding bugs for lots of functions; apparently setitimer was overlooked when fixing them.
2019-12-07arm: avoid conditional branch to PLT in sigsetjmpAndre McCurdy1-2/+3
The R_ARM_THM_JUMP19 relocation type generated for the original code when targeting Thumb 2 is not supported by the gold linker.
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