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1160 discussions

recvmmsg/sendmmsg not in kernel < Linux 2.6.33
by Lance Fredrickson 24 Sep '18

24 Sep '18

Hi, I'm having an issue where it seems recvmmsg/sendmmsg is being included into the c library regardless of kernel version. I work with kernel versions < 2.6.33 before this feature was included. When compiling applications, autoconf is then mistakenly told from the c-library that recvmmsg/sendmmsg is supported by the kernel, resulting in runtime errors. I use buildroot to compile my toolchains. Looking through uclibc-ng git, it looks like this feature was added with this commit. https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/commit/?id=6e15fafa200666… thanks, Lance Fredrickson

1 0

[PATCH] bugfix renameat2 wrong implement.
by Guo Ren 13 Sep '18

13 Sep '18

Signed-off-by: Guo Ren <ren_guo(a)c-sky.com> --- libc/sysdeps/linux/common/rename.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/libc/sysdeps/linux/common/rename.c b/libc/sysdeps/linux/common/rename.c index 30a4ed7..613ae4e 100644 --- a/libc/sysdeps/linux/common/rename.c +++ b/libc/sysdeps/linux/common/rename.c @@ -20,7 +20,9 @@ int rename(const char *oldpath, const char *newpath) # include <fcntl.h> int rename(const char *oldpath, const char *newpath) { - _syscall2(int, renameat2, const char *, oldpath, const char *, newpath) + _syscall5(int, renameat2, int, olddfd, const char *, oldpath, + int, newdfd, const char *, newpath, int, flags) + return renameat2(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0); } #else _syscall2(int, rename, const char *, oldpath, const char *, newpath) -- 2.7.4

1 0

[PATCH] wordexp: Fix the usage of the internal _itoa function
by Segev Finer 08 Sep '18

08 Sep '18

The original from glibc received the end of the buffer and worked backwards. Ours needs the beginning of the buffer. Signed-off-by: Segev Finer <segev208(a)gmail.com> --- libc/misc/wordexp/wordexp.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/libc/misc/wordexp/wordexp.c b/libc/misc/wordexp/wordexp.c index fb635fe91..285e81e87 100644 --- a/libc/misc/wordexp/wordexp.c +++ b/libc/misc/wordexp/wordexp.c @@ -491,10 +491,10 @@ parse_squote(char **word, size_t * word_length, size_t * max_length, #ifdef __WORDEXP_FULL static int eval_expr(char *expr, long int *result); -static char *_itoa(unsigned long long int value, char *buflim) +static char *_itoa(unsigned long long int value, char *buf) { - sprintf(buflim, "%llu", value); - return buflim; + sprintf(buf, "%llu", value); + return buf; } /* Functions to evaluate an arithmetic expression */ @@ -692,7 +692,7 @@ parse_arith(char **word, size_t * word_length, size_t * max_length, result[20] = '\0'; *word = w_addstr(*word, word_length, max_length, - _itoa(convertme, &result[20])); + _itoa(convertme, result)); free(expr); return *word ? 0 : WRDE_NOSPACE; } @@ -717,7 +717,7 @@ parse_arith(char **word, size_t * word_length, size_t * max_length, result[20] = '\0'; *word = w_addstr(*word, word_length, max_length, - _itoa(numresult, &result[20])); + _itoa(numresult, result)); free(expr); return *word ? 0 : WRDE_NOSPACE; } @@ -1313,7 +1313,7 @@ parse_param(char **word, size_t * word_length, size_t * max_length, if (seen_hash) { /* $# expands to the number of positional parameters */ buffer[20] = '\0'; - value = _itoa(__libc_argc - 1, &buffer[20]); + value = _itoa(__libc_argc - 1, buffer); seen_hash = 0; } else { /* Just $ on its own */ @@ -1338,13 +1338,13 @@ parse_param(char **word, size_t * word_length, size_t * max_length, /* Is it `$$'? */ if (*env == '$') { buffer[20] = '\0'; - value = _itoa(getpid(), &buffer[20]); + value = _itoa(getpid(), buffer); } /* Is it `${#*}' or `${#@}'? */ else if ((*env == '*' || *env == '@') && seen_hash) { buffer[20] = '\0'; value = _itoa(__libc_argc > 0 ? __libc_argc - 1 : 0, - &buffer[20]); + buffer); *word = w_addstr(*word, word_length, max_length, value); free(env); free(pattern); @@ -1770,7 +1770,7 @@ parse_param(char **word, size_t * word_length, size_t * max_length, param_length[20] = '\0'; *word = w_addstr(*word, word_length, max_length, _itoa(value ? strlen(value) : 0, - &param_length[20])); + param_length)); if (free_value) { assert(value != NULL); free(value); -- 2.18.0

2 1

[PATCH] Fix path to file libtest31.so
by Nikita Sobolev 16 Aug '18

16 Aug '18

From: Nikita Sobolev <sobolev(a)synopsys.com> Test failed with error 'Could not open libtest31.so: File not found'. dlopen function is trying to find libtest31.so in the same directory where the test is run. But libtest31.so is lockated in testlib directory. So fix changes the path to library. Signed-off-by: Nikita Sobolev <Nikita.Sobolev(a)synopsys.com> --- test/dlopen/tst-origin.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/test/dlopen/tst-origin.c b/test/dlopen/tst-origin.c index 60fcd3f..e456f1e 100644 --- a/test/dlopen/tst-origin.c +++ b/test/dlopen/tst-origin.c @@ -12,13 +12,13 @@ int main(int argc, char **argv) { int __attribute__((unused))(*mydltest)(const char *s); char *error; - h1 = dlopen ("libtest31.so", RTLD_LAZY); + h1 = dlopen ("testlib/libtest31.so", RTLD_LAZY); if (!h1) { fprintf(stderr, "Could not open libtest31.so: %s\n", dlerror()); exit(1); } - h2 = dlopen ("libtest31.so", RTLD_NOLOAD); + h2 = dlopen ("testlib/libtest31.so", RTLD_NOLOAD); if (!h2) { fprintf(stderr, "Could not open libtest31.so(RTLD_NOLOAD): %s\n", dlerror()); exit(1); -- 2.16.2

2 1

[PATCH] sched_setaffinity: use the same style with glibc's
by Guo Ren 16 Aug '18

16 Aug '18

Call getpid() in INTERNAL_SYSCALL will break the argument regs, because gcc couldn't save destoryed regs for system call asm. Ref to glibc, we could just remove all the check code. Signed-off-by: Guo Ren <ren_guo(a)c-sky.com> --- libc/sysdeps/linux/common/sched_setaffinity.c | 34 --------------------------- 1 file changed, 34 deletions(-) diff --git a/libc/sysdeps/linux/common/sched_setaffinity.c b/libc/sysdeps/linux/common/sched_setaffinity.c index 3d513ef..39f6ec8 100644 --- a/libc/sysdeps/linux/common/sched_setaffinity.c +++ b/libc/sysdeps/linux/common/sched_setaffinity.c @@ -27,42 +27,8 @@ static __always_inline _syscall3(int, __syscall_sched_setaffinity, __kernel_pid_t, pid, size_t, cpusetsize, const cpu_set_t *, cpuset) -static size_t __kernel_cpumask_size; - int sched_setaffinity(pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset) { - size_t cnt; - int res; - size_t psize = 128; - void *p = alloca (psize); - - if (unlikely (__kernel_cpumask_size == 0)) { - - INTERNAL_SYSCALL_DECL (err); - while (res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, getpid (), - psize, p), - INTERNAL_SYSCALL_ERROR_P (res, err) - && INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL) - p = extend_alloca (p, psize, 2 * psize); - - if (res == 0 || INTERNAL_SYSCALL_ERROR_P (res, err)) { - __set_errno (INTERNAL_SYSCALL_ERRNO (res, err)); - return -1; - } - - __kernel_cpumask_size = res; - } - - /* We now know the size of the kernel cpumask_t. Make sure the user - does not request to set a bit beyond that. */ - for (cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt) - if (((char *) cpuset)[cnt] != '\0') { - /* Found a nonzero byte. This means the user request cannot be - fulfilled. */ - __set_errno (EINVAL); - return -1; - } - return __syscall_sched_setaffinity(pid, cpusetsize, cpuset); } #endif -- 2.7.4

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[PATCH 00/32] FDPIC ABI for ARM
by Christophe Lyon 10 Aug '18

10 Aug '18

Hello, This patch series implements the uClibc-ng contribution of the FDPIC ABI for ARM targets. This ABI enables to run Linux on ARM MMU-less cores and supports shared libraries to reduce the memory footprint. Without MMU, text and data segments relative distances are different from one process to another, hence the need for a dedicated FDPIC register holding the start address of the data segment. One of the side effects is that function pointers require two words to be represented: the address of the code, and the data segment start address. These two words are designated as "Function Descriptor", hence the "FD PIC" name. On ARM, the FDPIC register is r9 [1], and the target name is arm-uclinuxfdpiceabi. Note that arm-uclinux exists, but uses another ABI and the BFLAT file format; it does not support code sharing. This work was developed some time ago by STMicroelectronics, and was presented during Linaro Connect SFO15 (September 2015). You can watch the discussion and read the slides [2]. This presentation was related to the toolchain published on github [3], which is based on binutils-2.22, gcc-4.7, uclibc-0.9.33.2, gdb-7.5.1 and qemu-2.3.0, and for which pre-built binaries are available [3]. The ABI itself is described in details in [1]. Our Linux kernel patches have been updated and committed by Nicolas Pitre (Linaro) in July 2017. They are required so that the loader is able to handle this new file type. Indeed, the ELF files are tagged with ELFOSABI_ARM_FDPIC. This new tag has been allocated by ARM, as well as the new relocations involved. The binutils and QEMU patch series have been merged recently. [4][5] The GCC patch series has been submitted and is under discussion. [6] This patch series consists in the original uClibc-based patches, which I have rebased and updated for uClibc-ng. Most of them are strictly related to FDPIC on ARM, while a few others address generic issues. Are the uClibc-ng patches OK for inclusion in master? Thanks, Christophe. [1] https://github.com/mickael-guene/fdpic_doc/blob/master/abi.txt [2] http://connect.linaro.org/resource/sfo15/sfo15-406-arm-fdpic-toolset-kernel… [3] https://github.com/mickael-guene/fdpic_manifest [4] https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=f1ac0af… [5] https://git.qemu.org/?p=qemu.git;a=commit;h=e8fa72957419c11984608062c7dcb20… [6] https://gcc.gnu.org/ml/gcc-patches/2018-05/msg01439.html Christophe Lyon (32): [ARM][FDPIC] Allow to select FDPIC ELF for arm architecture [FDPIC] rtld: Do not protect RELRO segments when we don't use an MMU. [ARM][FDPIC] rtld: Add #if defined (__FDPIC__) [ARM][FDPIC] rtld: Add FDPIC code for arm [ARM][FDPIC] rtld: Avoid FUNCDESC relocation on _start [ARM][FDPIC] rtld: Add startup code [ARM] Fix bug in _dl_pread when using pread64 syscall [ARM][FDPIC] Add application startup code for FDPIC [ARM][FDPIC] Add runtime support needed for C++ exceptions [ARM][FDPIC] Allow to generate PIE 'static' binary [ARM][FDPIC] rtld: Add lazy binding support [ARM][FDPIC] TLS: fix relocation computation [ARM][FDPIC] rtld: Compile with -fno-unwind-tables -fno-asynchronous-unwind-tables [ARM][FDPIC] arm/clone.S: Fix threading support [ARM][FDPIC] enable NPTL on TARGET_arm [ARM][FDPIC] rtld: Use ELF_RTYPE_CLASS_DLSYM [FDPIC] rtld: Initialize _dl_error_catch_tsd without FUNCDESC relocation [FDPIC] nptl: disable mprotect usage in stack protection [FDPIC] nptl: Disable fork and atfork on MMU-less systems. [FDPIC] nptl: Do not use madvise [ARM][FDPIC] nptl: Use linker-defined symbol to find start of .tdata section. [FDPIC] nptl: Allow sem_open to work on MMU-less systems [FDPIC] nptl: Add pthread_mutex_getprioceiling and pthread_mutex_setprioceiling support [FDPIC] nptl: Use vfork on MMU-less for system() nptl: Clear TLS area for static binaries. [FDPIC] nptl: Replace sbrk with mmap nptl threads: Fix bug in using a weak variable. Fix htab_delete loop counter isnan: Add isnan weak alias to __isnan mbtowc: Fix non compliant behavior for end of string Fix shm_open posix compliance error code [ARM] rtld: Avoid crash on R_ARM_NONE relocation extra/Configs/Config.in | 2 +- extra/Configs/Config.in.arch | 2 +- include/elf.h | 2 + include/link.h | 6 +- ldso/include/dl-elf.h | 2 +- ldso/include/dl-hash.h | 2 +- ldso/include/dl-string.h | 3 +- ldso/include/dl-syscall.h | 13 +- ldso/include/inline-hashtab.h | 2 +- ldso/ldso/Makefile.in | 2 - ldso/ldso/arm/dl-inlines.h | 1 + ldso/ldso/arm/dl-startup.h | 112 +++++++++++++- ldso/ldso/arm/dl-sysdep.h | 63 ++++++-- ldso/ldso/arm/elfinterp.c | 166 +++++++++++++++++---- ldso/ldso/arm/resolve.S | 23 +++ ldso/ldso/dl-elf.c | 6 +- ldso/ldso/dl-hash.c | 4 +- ldso/ldso/dl-tls.c | 1 + ldso/ldso/fdpic/dl-inlines.h | 2 + ldso/ldso/fdpic/dl-sysdep.h | 2 +- ldso/ldso/ldso.c | 23 ++- libc/misc/elf/dl-iterate-phdr.c | 2 +- libc/misc/internals/__uClibc_main.c | 47 +++++- libc/stdlib/stdlib.c | 6 +- libc/stdlib/system.c | 5 + libc/sysdeps/linux/arm/Makefile.arch | 2 +- libc/sysdeps/linux/arm/bits/elf-fdpic.h | 114 ++++++++++++++ libc/sysdeps/linux/arm/clone.S | 12 ++ libc/sysdeps/linux/arm/crt1.S | 66 ++++++++ libc/sysdeps/linux/arm/crtreloc.c | 144 ++++++++++++++++++ libc/sysdeps/linux/arm/find_exidx.c | 38 +++++ libc/sysdeps/linux/arm/find_got.c | 72 +++++++++ libm/s_isnan.c | 1 + libpthread/nptl/Makefile.in | 1 - libpthread/nptl/allocatestack.c | 6 + libpthread/nptl/linux_fsinfo.h | 5 +- libpthread/nptl/pthread_create.c | 4 + libpthread/nptl/sem_open.c | 8 +- libpthread/nptl/sysdeps/generic/libc-tls.c | 27 +++- libpthread/nptl/sysdeps/unix/sysv/linux/fork.c | 3 + .../sysdeps/unix/sysv/linux/libc_pthread_init.c | 4 + .../nptl/sysdeps/unix/sysv/linux/register-atfork.c | 14 +- .../sysdeps/unix/sysv/linux/unregister-atfork.c | 10 +- librt/shm.c | 3 + 44 files changed, 958 insertions(+), 75 deletions(-) create mode 100644 ldso/ldso/arm/dl-inlines.h create mode 100644 libc/sysdeps/linux/arm/bits/elf-fdpic.h create mode 100644 libc/sysdeps/linux/arm/crtreloc.c create mode 100644 libc/sysdeps/linux/arm/find_got.c -- 2.6.3

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[PATCH] uclibcng-testrunner.sh: create /etc/ethers
by Nikita Sobolev 01 Aug '18

01 Aug '18

/etc/ethers file is required for running tst-ethers and tst-ethers-line tests. If it does not exist, tests fail. Signed-off-by: Nikita Sobolev <Nikita.Sobolev(a)synopsys.com> --- test/uclibcng-testrunner.sh | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/test/uclibcng-testrunner.sh b/test/uclibcng-testrunner.sh index 4fd1661..4a02458 100644 --- a/test/uclibcng-testrunner.sh +++ b/test/uclibcng-testrunner.sh @@ -17,6 +17,9 @@ # of dealing in the work, even if advised of the possibility of such # damage or existence of a defect, except proven that it results out # of said person's immediate fault when using the work as intended. +# +# prepare function is used for creating ethers file. It is +# necessary for running tst-ethers and tst-ethers-line tests. #- # Testsuite runner @@ -25,6 +28,16 @@ die() { exit 1 } + +prepare() { + if [ ! -s /etc/ethers ] + then + echo "00:11:22:33:44:55 teeth" > /etc/ethers + fi +} + +prepare + test -s uclibcng-testrunner.in || die uclibcng-testrunner.in not found nfail=0 -- 2.16.2

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[uclibc-ng-test] Revert "arc: disable deadlocking test"
by Vineet Gupta 21 Jul '18

21 Jul '18

This seems to work fine on ARC ! This reverts commit f0567d67075ff7a27ada8ab5bce750fe8a739763. Signed-off-by: Vineet Gupta <vgupta(a)synopsys.com> --- test/nptl/Makefile.in | 5 ----- 1 file changed, 5 deletions(-) diff --git a/test/nptl/Makefile.in b/test/nptl/Makefile.in index 761f52db8366..35859f944911 100644 --- a/test/nptl/Makefile.in +++ b/test/nptl/Makefile.in @@ -1,11 +1,6 @@ # uClibc-ng NPTL tests # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. -# deadlock -ifeq ($(TARGET_ARCH),arc) -TESTS_DISABLED := tst-cond16 -endif - ifeq ($(TARGET_ARCH),metag) TESTS_DISABLED := tst-cleanup0 tst-cleanupx0 endif -- 2.7.4

2 1

[PATCH 30/32] mbtowc: Fix non compliant behavior for end of string
by Christophe Lyon 04 Jul '18

04 Jul '18

Match glibc behavior. * libc/stdlib/stdlib.c (mbtowc): Fix end of string behavior. Signed-off-by: Mickaël Guêné <mickael.guene(a)st.com> Signed-off-by: Christophe Lyon <christophe.lyon(a)st.com> diff --git a/libc/stdlib/stdlib.c b/libc/stdlib/stdlib.c index 075e6e5..f593663 100644 --- a/libc/stdlib/stdlib.c +++ b/libc/stdlib/stdlib.c @@ -895,9 +895,13 @@ int mbtowc(wchar_t *__restrict pwc, register const char *__restrict s, size_t n) return is_stateful(ENCODING); } - if (*s == '\0') + if (*s == '\0') { /* According to the ISO C 89 standard this is the expected behaviour. */ + /* Standard not very clear here, so do like glibc. */ + if (pwc != NULL) + *pwc = L'\0'; return 0; + } if ((r = mbrtowc(pwc, s, n, &state)) == (size_t) -2) { /* TODO: Should we set an error state? */ -- 2.6.3

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statfs call corrupts memory struct statfs too small
by Geoff Levand 29 Jun '18

29 Jun '18

Hi, I experienced seg faults due to stack corruption when calling statfs() with an automatic struct statfs variable. It seems there is a mismatch between the struct statfs used by libc and that used by the arm64 kernel. The call to statfs() writes 120 bytes, but struct statfs is only 88 bytes. The attached test program shows this. Building for arm64. libuClibc-1.0.30 kernel: Linux-4.17.3 Comparing these files: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/tre… https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/tree/libc/sysdeps/linux/c… I see for the kernel all fields of struct statfs except f_fsid are the same length at 64 bits for arm64, and that gives 120 bytes. That differs from the libc version which has some 32 bit fields. I filed this bug over at buildroot, but it was suggested to report it here: https://bugs.busybox.net/show_bug.cgi?id=11121 The output of statfs-test program: sizeof statfs: 88 sizeof packed: 138 1: 94 94 2: 19 19 3: 2 2 4: 1 1 5: 0 0 6: 0 0 7: 0 0 8: 0 0 9: 0 0 10: 10 10 11: 0 0 12: 0 0 13: 0 0 14: 0 0 15: 0 0 16: 0 0 17: 72 72 18: a5 a5 19: 7 7 20: 0 0 21: 0 0 22: 0 0 23: 0 0 24: 0 0 25: 83 83 26: 80 80 27: 7 7 28: 0 0 29: 0 0 30: 0 0 31: 0 0 32: 0 0 33: 83 83 34: 80 80 35: 7 7 36: 0 0 37: 0 0 38: 0 0 39: 0 0 40: 0 0 41: 72 72 42: a5 a5 43: 7 7 44: 0 0 45: 0 0 46: 0 0 47: 0 0 48: 0 0 49: d9 d9 50: a0 a0 51: 7 7 52: 0 0 53: 0 0 54: 0 0 55: 0 0 56: 0 0 57: 0 0 58: 0 0 59: 0 0 60: 0 0 61: 0 0 62: 0 0 63: 0 0 64: 0 0 65: ff ff 66: 0 0 67: 0 0 68: 0 0 69: 0 0 70: 0 0 71: 0 0 72: 0 0 73: 0 0 74: 10 10 75: 0 0 76: 0 0 77: 0 0 78: 0 0 79: 0 0 80: 0 0 81: 20 20 82: 0 0 83: 0 0 84: 0 0 85: 0 0 86: 0 0 87: 0 0 88: 0 0 89: 0 0 90: 0 0 91: 0 0 92: 0 0 93: 0 0 94: 0 0 95: 0 0 96: 0 0 97: 0 0 98: 0 0 99: 0 0 100: 0 0 101: 0 0 102: 0 0 103: 0 0 104: 0 0 105: 0 0 106: 0 0 107: 0 0 108: 0 0 109: 0 0 110: 0 0 111: 0 0 112: 0 0 113: 0 0 114: 0 0 115: 0 0 116: 0 0 117: 0 0 118: 0 0 119: 0 0 120: 0 0 121: ff cc 122: ff cc 123: ff cc 124: ff cc 125: ff cc 126: ff cc 127: ff cc 128: ff cc 129: ff cc 130: ff cc 131: ff cc 132: ff cc 133: ff cc 134: ff cc 135: ff cc 136: ff cc 137: ff cc 138: ff cc -Geoff

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