devel November 2023

devel@uclibc-ng.org

6 participants
18 discussions

[PATCH] elf: support ELF binaries in noMMU

by Greg Ungerer

The Linux kernels ELF-FDPIC binfmt program loader can support loading and running conventional ELF format binaries on noMMU kernels when compiled appropriately. That is when they are constant displacement binaries such as generated using the -pie compile option. Add a configure option to allow selecting ELF binary support in noMMU mode configurations on architectures that support this. The main requirement is to generate the ldso run-time loader to perform relocation at load time. These configurations do not support shared libraries, so there is no need to generate a full shared library, only the static version is required. The use of ELF format binaries does mean a slightly simpler toolchain generation (does not require a -uclinux- for some architectures) and does not require an extra tool like elf2flt. This initial support targets M68K, ARM and RISC-V architectures. No kernel changes are required, the required support for this is already in mainline kernels (certainly as of linux-6.6). Note that for the M68K and ARM architectures that the initialized registers and stack layout at process startup is slightly different for the flat format loader and the ELF/ELF-FDPIC loaders. So we need some changes to the startup code (crt1.S) for them. I have not done extensive testing outside of M68K, ARM and RISC-V. I had to make changes to a couple of the dl-startup.h architecture files to get them to build for this noMMU case. I did not dig down too deep on the reasons, but they still seem ok for the MMU case as well. Signed-off-by: Greg Ungerer <gerg(a)linux-m68k.org> --- Makerules | 3 +++ Rules.mak | 2 ++ extra/Configs/Config.in | 9 +++++++-- extra/Configs/Config.in.arch | 8 ++++++++ ldso/include/dl-defs.h | 2 -- ldso/include/ldso.h | 2 +- ldso/ldso/arm/dl-startup.h | 2 ++ ldso/ldso/m68k/dl-startup.h | 3 +++ ldso/ldso/m68k/dl-sysdep.h | 2 ++ ldso/ldso/riscv64/dl-startup.h | 2 ++ libc/sysdeps/linux/arm/crt1.S | 2 +- libc/sysdeps/linux/m68k/crt1.S | 10 +++++++--- 12 files changed, 38 insertions(+), 9 deletions(-) diff --git a/Makerules b/Makerules index 845d81897..1a7443c39 100644 --- a/Makerules +++ b/Makerules @@ -22,6 +22,9 @@ ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y) libs: $(lib-gdb-y) endif libs: $(lib-a-y) +ifeq ($(HAVE_LDSO),y) +$(lib-a-y): | $(ldso) +endif endif objs: all_objs $(lib-so-y) $(lib-a-y): | $(top_builddir)lib diff --git a/Rules.mak b/Rules.mak index 5b9154b72..2aacee521 100644 --- a/Rules.mak +++ b/Rules.mak @@ -167,6 +167,8 @@ endif ifneq ($(HAVE_SHARED),y) libc := +endif +ifneq ($(HAVE_LDSO),y) interp := ldso := endif diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in index 287db13d2..18748d54b 100644 --- a/extra/Configs/Config.in +++ b/extra/Configs/Config.in @@ -333,8 +333,9 @@ config STATIC_PIE bool "Add support for Static Position Independent Executables (PIE)" default n depends on DOPIC && !UCLIBC_FORMAT_FDPIC_ELF && \ - (TARGET_arm || TARGET_i386 || TARGET_x86_64 || TARGET_aarch64 || \ - TARGET_mips || TARGET_xtensa || TARGET_powerpc) + (TARGET_aarch64 || TARGET_arm || TARGET_i386 || \ + TARGET_m68k || TARGET_mips || TARGET_powerpc || \ + TARGET_riscv64 || TARGET_x86_64 || TARGET_xtensa) config ARCH_HAS_NO_SHARED bool @@ -346,9 +347,13 @@ config ARCH_HAS_NO_LDSO config ARCH_HAS_UCONTEXT bool +config HAVE_LDSO + bool + config HAVE_SHARED bool "Enable shared libraries" depends on !ARCH_HAS_NO_SHARED + select HAVE_LDSO default y help If you wish to build uClibc with support for shared libraries then diff --git a/extra/Configs/Config.in.arch b/extra/Configs/Config.in.arch index 91b639493..4bcf3ff3f 100644 --- a/extra/Configs/Config.in.arch +++ b/extra/Configs/Config.in.arch @@ -10,6 +10,14 @@ if !ARCH_USE_MMU choice prompt "Target File Format" +config UCLIBC_FORMAT_ELF + bool "ELF (using ELF_FDPIC loader)" + depends on !ARCH_USE_MMU && (TARGET_arm || TARGET_m68k || \ + TARGET_riscv64) + select DOPIC + select STATIC_PIE + select ARCH_HAS_NO_SHARED + select HAVE_LDSO config UCLIBC_FORMAT_FDPIC_ELF bool "FDPIC ELF" depends on !ARCH_USE_MMU && (TARGET_bfin || TARGET_frv || TARGET_arm) diff --git a/ldso/include/dl-defs.h b/ldso/include/dl-defs.h index daa6685cb..e404f17ec 100644 --- a/ldso/include/dl-defs.h +++ b/ldso/include/dl-defs.h @@ -72,10 +72,8 @@ typedef struct { #endif #ifdef _LIBC -#ifndef __ARCH_HAS_NO_SHARED__ /* arch specific defines */ #include <dl-sysdep.h> -#endif #ifdef __TARGET_c6x__ #include <dl-sysdep.h> #endif diff --git a/ldso/include/ldso.h b/ldso/include/ldso.h index 8d9d057a0..80d5d5dd5 100755 --- a/ldso/include/ldso.h +++ b/ldso/include/ldso.h @@ -48,7 +48,7 @@ /* Pull in the MIN macro */ #include <sys/param.h> /* Pull in the ldso syscalls and string functions */ -#ifndef __ARCH_HAS_NO_SHARED__ +#if !defined(__ARCH_HAS_NO_SHARED__) || !defined(__ARCH_HAS_NO_LDSO__) #include <dl-syscall.h> #include <dl-string.h> /* Now the ldso specific headers */ diff --git a/ldso/ldso/arm/dl-startup.h b/ldso/ldso/arm/dl-startup.h index cacd461e1..d00e7b053 100644 --- a/ldso/ldso/arm/dl-startup.h +++ b/ldso/ldso/arm/dl-startup.h @@ -301,3 +301,5 @@ int raise(int sig) _dl_exit(1); } #endif /* __FDPIC__ */ + +#define DL_UPDATE_LOADADDR_HDR(LOADADDR, ADDR, PHDR) diff --git a/ldso/ldso/m68k/dl-startup.h b/ldso/ldso/m68k/dl-startup.h index dfece443f..9c3285e27 100644 --- a/ldso/ldso/m68k/dl-startup.h +++ b/ldso/ldso/m68k/dl-startup.h @@ -55,6 +55,9 @@ _dl_start_user:\n\ * do something a little more subtle here. */ #define GET_ARGV(ARGVP, ARGS) ARGVP = (((unsigned long *) ARGS) + 1) +/* We can't call functions earlier in the dl startup process */ +#define NO_FUNCS_BEFORE_BOOTSTRAP + /* Handle relocation of the symbols in the dynamic loader. */ static __always_inline void PERFORM_BOOTSTRAP_RELOC(ELF_RELOC *rpnt, unsigned long *reloc_addr, diff --git a/ldso/ldso/m68k/dl-sysdep.h b/ldso/ldso/m68k/dl-sysdep.h index 21937b259..5d2d7a097 100644 --- a/ldso/ldso/m68k/dl-sysdep.h +++ b/ldso/ldso/m68k/dl-sysdep.h @@ -83,3 +83,5 @@ elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr, *reloc_addr = load_off + rpnt->r_addend; } while (--relative_count); } + +#define DL_UPDATE_LOADADDR_HDR(LOADADDR, ADDR, PHDR) diff --git a/ldso/ldso/riscv64/dl-startup.h b/ldso/ldso/riscv64/dl-startup.h index dabe1bebd..82e525e66 100644 --- a/ldso/ldso/riscv64/dl-startup.h +++ b/ldso/ldso/riscv64/dl-startup.h @@ -88,3 +88,5 @@ void PERFORM_BOOTSTRAP_RELOC(ELF_RELOC *rpnt, ElfW(Addr) *reloc_addr, _dl_exit(1); } } + +#define DL_UPDATE_LOADADDR_HDR(LOADADDR, ADDR, PHDR) diff --git a/libc/sysdeps/linux/arm/crt1.S b/libc/sysdeps/linux/arm/crt1.S index fade1d25c..799f11080 100644 --- a/libc/sysdeps/linux/arm/crt1.S +++ b/libc/sysdeps/linux/arm/crt1.S @@ -245,7 +245,7 @@ _start: mov fp, #0 mov lr, #0 -#ifdef __ARCH_USE_MMU__ +#if defined(__ARCH_USE_MMU__) || defined(__UCLIBC_FORMAT_ELF__) #ifdef L_rcrt1 /* We don't need to save a1 since no dynamic linker should have run */ ldr a1, .L_GOT /* Get value at .L_GOT + 0 (offset to GOT)*/ diff --git a/libc/sysdeps/linux/m68k/crt1.S b/libc/sysdeps/linux/m68k/crt1.S index 815a6076f..e7292682b 100644 --- a/libc/sysdeps/linux/m68k/crt1.S +++ b/libc/sysdeps/linux/m68k/crt1.S @@ -78,9 +78,13 @@ _start: sub.l %fp, %fp #if !defined __ARCH_USE_MMU__ && defined __PIC__ +#ifdef UCLIBC_FORMAT_ELF + move.l #_GLOBAL_OFFSET_TABLE_, %a5 +#else /* Set up the global pointer. The GOT is at the beginning of the data segment, whose address is in %d5. */ move.l %d5,%a5 +#endif .equ have_current_got, 1 #endif @@ -92,11 +96,11 @@ _start: arguments for `main': argc, argv. envp will be determined later in __libc_start_main. */ move.l (%sp)+, %d0 /* Pop the argument count. */ -#ifndef __ARCH_USE_MMU__ - move.l (%sp)+, %a0 -#else +#if defined(__ARCH_USE_MMU__) || defined(__UCLIBC_FORMAT_ELF__) move.l %sp, %a0 /* The argument vector starts just at the current stack top. */ +#else + move.l (%sp)+, %a0 #endif /* Provide the highest stack address to the user code (for stacks -- 2.25.1

5 months, 1 week

[PATCH] linuxthreads: Avoid definiton without prototype warning

by Marcus Haehnel

The spurious_wakeup_count variable is set but is never actually used for the semaphore implementation. To avoid a clang warning for this case remove the unused variable. --- libpthread/linuxthreads/semaphore.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) diff --git a/libpthread/linuxthreads/semaphore.c b/libpthread/linuxthreads/semaphore.c index 9025dfee6..9464204a9 100644 --- a/libpthread/linuxthreads/semaphore.c +++ b/libpthread/linuxthreads/semaphore.c @@ -61,7 +61,6 @@ int sem_wait(sem_t * sem) volatile pthread_descr self = thread_self(); pthread_extricate_if extr; int already_canceled = 0; - int spurious_wakeup_count; /* Set up extrication interface */ extr.pu_object = sem; @@ -90,7 +89,6 @@ int sem_wait(sem_t * sem) } /* Wait for sem_post or cancellation, or fall through if already canceled */ - spurious_wakeup_count = 0; while (1) { suspend(self); @@ -98,8 +96,7 @@ int sem_wait(sem_t * sem) && (THREAD_GETMEM(self, p_woken_by_cancel) == 0 || THREAD_GETMEM(self, p_cancelstate) != PTHREAD_CANCEL_ENABLE)) { - /* Count resumes that don't belong to us. */ - spurious_wakeup_count++; + /* Resume does not belong to us. */ continue; } break; @@ -213,7 +210,6 @@ int sem_timedwait(sem_t *sem, const struct timespec *abstime) pthread_descr self = thread_self(); pthread_extricate_if extr; int already_canceled = 0; - int spurious_wakeup_count; __pthread_lock(&sem->__sem_lock, self); if (sem->__sem_value > 0) { @@ -250,7 +246,6 @@ int sem_timedwait(sem_t *sem, const struct timespec *abstime) __pthread_do_exit(PTHREAD_CANCELED, CURRENT_STACK_FRAME); } - spurious_wakeup_count = 0; while (1) { if (timedsuspend(self, abstime) == 0) { @@ -277,8 +272,7 @@ int sem_timedwait(sem_t *sem, const struct timespec *abstime) && (THREAD_GETMEM(self, p_woken_by_cancel) == 0 || THREAD_GETMEM(self, p_cancelstate) != PTHREAD_CANCEL_ENABLE)) { - /* Count resumes that don't belong to us. */ - spurious_wakeup_count++; + /* Resume does not belong to us. */ continue; } break; -- 2.42.0

5 months, 3 weeks

[PATCH] getaddrinfo.c: Avoid misleading indentation warning

by Marcus Haehnel

When compiling getaddrinfo.c with clang the -Wmisleading-indentation option will cause a warning due to the indentation lining up with the previous statement in the if block above. For gcc the warning is blinded by the commented line. See also: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107162 Move the comment behind the function call to make both compilers happy. --- libc/inet/getaddrinfo.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/libc/inet/getaddrinfo.c b/libc/inet/getaddrinfo.c index a9000ae13..f34a4726c 100644 --- a/libc/inet/getaddrinfo.c +++ b/libc/inet/getaddrinfo.c @@ -959,8 +959,7 @@ getaddrinfo(const char *name, const char *service, last_i = i; if (hints->ai_family == AF_UNSPEC && (i & GAIH_OKIFUNSPEC)) continue; - /*if (p) - freeaddrinfo works ok on NULL too */ - freeaddrinfo(p); + freeaddrinfo(p); /* freeaddrinfo works ok on NULL too */ return -(i & GAIH_EAI); } if (end) -- 2.42.0

5 months, 3 weeks

Problem with static linking an vDSO

by Ramin Moussavi

I would like to extend the functions that can be utilized from the vDSO to check for potential issues with combinations of config, architecture, kernel, and gcc. I've created GitHub workflows for this purpose at https://github.com/lordrasmus/uclibc-ng. Currently, the kvx port has shown the most success with the highest number of passed tests. I encountered an issue where busybox, when statically linked, fails with vDSO support. The problem lies in _dl__vdso_gettimeofday, which is present in ld-uClibc_so.a but not in libc.a. It seems that busybox cannot utilize ld-uClibc_so.a because it's not installed into the sysroot. I'm seeking suggestions on how to resolve this issue. If anyone has ideas or solutions, please share them. Additionally, if there are any suggestions for improving my workflows, I would appreciate the input. I'm currently developing a tool to simplify the download of files such as configuration and compilers used in the workflow for local checking. This tool also integrates the ability to run tests on qemu. You can find it at https://github.com/lordrasmus/uclibc-ng-dev.

5 months, 3 weeks

[PATCH] rlimit: fix 64-bit RLIM64_INFINITY macro

by Pavel Kozlov

From: Pavel Kozlov <pavel.kozlov(a)synopsys.com> Linux kernel returns -1ULL as RLIM64_INFINITY for all cpus. Fix RLIM64_INFINTIY and 64-bit variant of RLIM_INFINITY macro for sparc, mips, alpha, as for these CPUs the library uses different value than what the kernel sets and it can cause incorrect RLIM64_INFINTY check. Because alpha is a 64-bit arch, fix the RLIM_INFINITY macro twice (the value should be the same with and without __USE_FILE_OFFSET64 definition) to match the prlimit64 syscall in the kernel. Previous implementation of setrlimit/getrlimit functions didn't use prlimit64 syscall and didn't receive RLIM64_INFINTIY from the kernel, RLIM64_INFINTY macro was used by the library itself to mimic the 64-bit rlimit in the getrlimit64/setrlimit64 functions, that allowed to have RLIM64_INFINTIY different from what the kernel sets. New implementation of setrlimit/getrlimit uses prlimit64 and checks for RLIM64_INFINITY value and must have equal RLIM64_INFINITY definition with what the kernel uses. This issue is indicated by the tst-rlim/tst-rlim64 tests on sparc/mips32/alpha, tests return 23 (UNSUPPORTED) because of incorrect RLIM_INFINTY check for available rlimit type. This patch will require rebuild of sparc/mips32/alpha binaries that explicitly use RLIM64_INFINTY or 64-bit variant of RLIM_INFINITY (if binary for 32-bit CPU was built with _FILE_OFFSET_BITS=64) to update the macro value. Signed-off-by: Pavel Kozlov <pavel.kozlov(a)synopsys.com> --- libc/sysdeps/linux/alpha/bits/resource.h | 6 +++--- libc/sysdeps/linux/mips/bits/resource.h | 4 ++-- libc/sysdeps/linux/sparc/bits/resource.h | 4 ++-- libc/sysdeps/linux/sparc64/bits/resource.h | 4 ++-- 4 files changed, 9 insertions(+), 9 deletions(-) diff --git a/libc/sysdeps/linux/alpha/bits/resource.h b/libc/sysdeps/linux/alpha/bits/resource.h index 38f73961e99d..dba818714d84 100644 --- a/libc/sysdeps/linux/alpha/bits/resource.h +++ b/libc/sysdeps/linux/alpha/bits/resource.h @@ -113,13 +113,13 @@ enum __rlimit_resource /* Value to indicate that there is no limit. */ #ifndef __USE_FILE_OFFSET64 -# define RLIM_INFINITY ((long int)(~0UL >> 1)) +# define RLIM_INFINITY ((unsigned long int)(~0UL)) #else -# define RLIM_INFINITY 0x7fffffffffffffffLL +# define RLIM_INFINITY 0xffffffffffffffffULL #endif #ifdef __USE_LARGEFILE64 -# define RLIM64_INFINITY 0x7fffffffffffffffLL +# define RLIM64_INFINITY 0xffffffffffffffffULL #endif /* We can represent all limits. */ diff --git a/libc/sysdeps/linux/mips/bits/resource.h b/libc/sysdeps/linux/mips/bits/resource.h index 5690527bf9a3..97487d274f21 100644 --- a/libc/sysdeps/linux/mips/bits/resource.h +++ b/libc/sysdeps/linux/mips/bits/resource.h @@ -123,10 +123,10 @@ enum __rlimit_resource # ifndef __USE_FILE_OFFSET64 # define RLIM_INFINITY ((long int)(~0UL >> 1)) # else -# define RLIM_INFINITY 0x7fffffffffffffffULL +# define RLIM_INFINITY 0xffffffffffffffffULL # endif # ifdef __USE_LARGEFILE64 -# define RLIM64_INFINITY 0x7fffffffffffffffULL +# define RLIM64_INFINITY 0xffffffffffffffffULL # endif #endif diff --git a/libc/sysdeps/linux/sparc/bits/resource.h b/libc/sysdeps/linux/sparc/bits/resource.h index a5ec31e4e677..48e1049f41a6 100644 --- a/libc/sysdeps/linux/sparc/bits/resource.h +++ b/libc/sysdeps/linux/sparc/bits/resource.h @@ -114,11 +114,11 @@ enum __rlimit_resource #ifndef __USE_FILE_OFFSET64 # define RLIM_INFINITY ((long int)(~0UL >> 1)) #else -# define RLIM_INFINITY 0x7fffffffffffffffLL +# define RLIM_INFINITY 0xffffffffffffffffULL #endif #ifdef __USE_LARGEFILE64 -# define RLIM64_INFINITY 0x7fffffffffffffffLL +# define RLIM64_INFINITY 0xffffffffffffffffULL #endif /* We can represent all limits. */ diff --git a/libc/sysdeps/linux/sparc64/bits/resource.h b/libc/sysdeps/linux/sparc64/bits/resource.h index f1e11e239602..84c76878520d 100644 --- a/libc/sysdeps/linux/sparc64/bits/resource.h +++ b/libc/sysdeps/linux/sparc64/bits/resource.h @@ -128,11 +128,11 @@ enum __rlimit_resource #ifndef __USE_FILE_OFFSET64 # define RLIM_INFINITY ((long int)(~0UL >> 1)) #else -# define RLIM_INFINITY 0x7fffffffffffffffLL +# define RLIM_INFINITY 0xffffffffffffffffULL #endif #ifdef __USE_LARGEFILE64 -# define RLIM64_INFINITY 0x7fffffffffffffffLL +# define RLIM64_INFINITY 0xffffffffffffffffULL #endif #endif -- 2.25.1

6 months

Re: diable misc tests

by Pavel Kozlov

Hi Ramin, > the variable i is overwritten with 0 after the getrlimit() call > my guess is that rlim needs a 8 byte alignment on sparc Thanks for sharing this problem. > i'm using the current uclibc-ng master ( only a few commits are not merged ) Please point to the exact commit you are on. If you are somewhere between: 95e38b37 ("add support for systems without legacy setrlimit/getrlimit syscalls") and 8c2f6218 (setrlimit/getrlimit: fix prlimit64 syscall use for 32-bit CPUs) then I have a simple explanation for this problem, and it is already fixed by the 8c2f6218 and the following commits. Please check the 8c2f6218 commit description. Regards, - Pavel From: Ramin Moussavi <lordrasmus(a)gmail.com> Sent: Tuesday, November 14, 2023 11:47 PM To: Waldemar Brodkorb <mail(a)waldemar-brodkorb.de> Cc: devel(a)uclibc-ng.org <devel(a)uclibc-ng.org> Subject: [uclibc-ng-devel] Re: diable misc tests i'm using the current uclibc-ng master ( only a few commits are not merged ) i wanted to report that issue later when know what is going wrong for now i just disabled the misc tests on sparc what i discovered is that when running the test suite on qemu sparc the test tst-rlimit.c runs into an endless loop here is what is happening on my build int main(void) { int rnum = -1; struct rlimit rlim; int i, ret; /* Find a resource with hard limit set to infinity */ for (i = 0; i < nresources; ++i) { ret = getrlimit(resources[i], &rlim); if ((!ret) && (rlim.rlim_max == RLIM_INFINITY)) { rnum = resources[i]; break; } } the variable i is overwritten with 0 after the getrlimit() call my guess is that rlim needs a 8 byte alignment on sparc when i set the alignment for rlim to 8 bytes via gcc attributes the tests runs fine for now i don't know if its a gcc , qemu or kernel issue Am Di., 14. Nov. 2023 um 14:27 Uhr schrieb Waldemar Brodkorb <wbx(a)uclibc-ng.org>: Hi, works for me. You need to use uclibc-ng master for the new rlimit tests. I pushed them to github now. best regards Waldemar Ramin Moussavi wrote, > > _______________________________________________ > devel mailing list -- devel(a)uclibc-ng.org > To unsubscribe send an email to devel-leave(a)uclibc-ng.org

6 months

diable misc tests

by Ramin Moussavi

6 months, 1 week

[PATCH] misc: add tests for getrlimit/setrlimit/prlimit

by Pavel Kozlov

From: Pavel Kozlov <pavel.kozlov(a)synopsys.com> Add tst-rlimit test to check setrlimit/getrlimit/prlimit and setrlimit64/getrlimit64/prlimit64 functions. Add tst-rlimit64 to check the 64-bit offset variant. Signed-off-by: Pavel Kozlov <pavel.kozlov(a)synopsys.com> --- test/misc/Makefile.in | 1 + test/misc/tst-rlimit.c | 157 +++++++++++++++++++++++++++++++++++++++ test/misc/tst-rlimit64.c | 1 + 3 files changed, 159 insertions(+) create mode 100644 test/misc/tst-rlimit.c create mode 100644 test/misc/tst-rlimit64.c diff --git a/test/misc/Makefile.in b/test/misc/Makefile.in index a97b124e4a35..96c1fd976f0e 100644 --- a/test/misc/Makefile.in +++ b/test/misc/Makefile.in @@ -8,6 +8,7 @@ TESTS_DISABLED += tst-inotify endif CFLAGS_dirent64 := -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 +CFLAGS_tst-rlimit64 := -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 DODIFF_dirent := 1 DODIFF_dirent64 := 1 diff --git a/test/misc/tst-rlimit.c b/test/misc/tst-rlimit.c new file mode 100644 index 000000000000..84aa465869da --- /dev/null +++ b/test/misc/tst-rlimit.c @@ -0,0 +1,157 @@ +/* + * setrlimit/getrlimit/prlimit and setrlimit64/getrlimit64/prlimit64 functions + * test for uClibc. + * + * The prlimit64 function is not called directly in this test, because it is a + * new function for uclibc and can cause build problems with uclibc-ng <= 1.0.44. + * With _FILE_OFFSET_BITS == 64 the prlimit call is redirected to the prlimit64 + * call. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <sys/resource.h> + +#define __ASSERT(x, f, l) \ + if (!(x)) { \ + fprintf(stderr, "%s: LINE %d: ASSERT: " #x "\n", f, l); \ + exit(1); \ + } + +#define ASSERT(x) __ASSERT(x, __FILE__, __LINE__) + +static int resources[] = { + RLIMIT_CORE, + RLIMIT_CPU, + RLIMIT_DATA, + RLIMIT_FSIZE, + RLIMIT_NOFILE, + RLIMIT_STACK, + RLIMIT_AS +}; + +#define nresources (sizeof (resources) / sizeof (resources[0])) +#define TEST_VAL 0x11223344 + + +static void test_getrlimit(int rnum, rlim_t exp_cur, rlim_t exp_max) +{ + struct rlimit r; + + ASSERT(getrlimit(rnum, &r) == 0); + ASSERT(r.rlim_cur == exp_cur); + ASSERT(r.rlim_max == exp_max); +} + +static void test_setrlimit(int rnum, rlim_t new_cur, rlim_t new_max) +{ + struct rlimit r = {.rlim_cur = new_cur, .rlim_max = new_max}; + + ASSERT(setrlimit(rnum, &r) == 0); +} + +static void test_prlimit_get(int rnum, rlim_t exp_cur, rlim_t exp_max) +{ + struct rlimit r; + + ASSERT(prlimit(0, rnum, NULL, &r) == 0); + ASSERT(r.rlim_cur == exp_cur); + ASSERT(r.rlim_max == exp_max); +} + +static void test_prlimit_set(int rnum, rlim_t new_cur, rlim_t new_max) +{ + struct rlimit r = {.rlim_cur = new_cur, .rlim_max = new_max}; + ASSERT(prlimit(0, rnum, &r, NULL) == 0); +} + +#if defined(__USE_LARGEFILE64) +static void test_getrlimit64(int rnum, rlim64_t exp_cur, rlim64_t exp_max) +{ + struct rlimit64 r; + + ASSERT(getrlimit64(rnum, &r) == 0); + ASSERT(r.rlim_cur == exp_cur); + ASSERT(r.rlim_max == exp_max); +} + +static void test_setrlimit64(int rnum, rlim64_t new_cur, rlim64_t new_max) +{ + struct rlimit64 r = {.rlim_cur = new_cur, .rlim_max = new_max}; + + ASSERT(setrlimit64(rnum, &r) == 0); +} +#endif + +int main(void) +{ + int rnum = -1; + struct rlimit rlim; + int i, ret; + + /* Find a resource with hard limit set to infinity */ + for (i = 0; i < nresources; ++i) { + ret = getrlimit(resources[i], &rlim); + if ((!ret) && (rlim.rlim_max == RLIM_INFINITY)) { + rnum = resources[i]; + break; + } + } + + /* Can't continue, return unsupported */ + if (rnum == -1) + return 23; + + /* Test cases */ + test_setrlimit(rnum, TEST_VAL, RLIM_INFINITY); + test_getrlimit(rnum, TEST_VAL, RLIM_INFINITY); + test_setrlimit(rnum, RLIM_INFINITY, RLIM_INFINITY); + test_getrlimit(rnum, RLIM_INFINITY, RLIM_INFINITY); + test_prlimit_get(rnum, RLIM_INFINITY, RLIM_INFINITY); + test_prlimit_set(rnum, TEST_VAL, RLIM_INFINITY); + test_prlimit_get(rnum, TEST_VAL, RLIM_INFINITY); + test_getrlimit(rnum, TEST_VAL, RLIM_INFINITY); + test_prlimit_set(rnum, RLIM_INFINITY, RLIM_INFINITY); + test_getrlimit(rnum, RLIM_INFINITY, RLIM_INFINITY); + test_prlimit_get(rnum, RLIM_INFINITY, RLIM_INFINITY); + +#if defined(__USE_LARGEFILE64) + /* Check setrlim64 and getrlim64 in 32-bit offset LFS environment */ + test_setrlimit64(rnum, TEST_VAL, RLIM64_INFINITY); + test_getrlimit(rnum, TEST_VAL, RLIM_INFINITY); + test_getrlimit64(rnum, TEST_VAL, RLIM64_INFINITY); + test_setrlimit64(rnum, RLIM64_INFINITY, RLIM64_INFINITY); + test_prlimit_get(rnum, RLIM_INFINITY, RLIM_INFINITY); + test_getrlimit64(rnum, RLIM64_INFINITY, RLIM64_INFINITY); + + test_setrlimit(rnum, TEST_VAL, RLIM_INFINITY); + test_getrlimit64(rnum, TEST_VAL, RLIM64_INFINITY); + test_prlimit_set(rnum, RLIM_INFINITY, RLIM_INFINITY); + test_getrlimit64(rnum, RLIM64_INFINITY, RLIM64_INFINITY); +#endif + + +#if defined(__USE_LARGEFILE64) && _FILE_OFFSET_BITS == 64 + /* Check setrlim64/getrlim64/prlimit64 in 64-bit offset environment */ + test_setrlimit64(rnum, TEST_VAL, RLIM64_INFINITY); + test_getrlimit64(rnum, TEST_VAL, RLIM64_INFINITY); + test_getrlimit(rnum, TEST_VAL, RLIM_INFINITY); + test_setrlimit64(rnum, RLIM64_INFINITY, RLIM64_INFINITY); + test_prlimit_get(rnum, RLIM64_INFINITY, RLIM64_INFINITY); + test_getrlimit(rnum, RLIM_INFINITY, RLIM_INFINITY); + test_prlimit_set(rnum, TEST_VAL, RLIM64_INFINITY); + test_prlimit_get(rnum, TEST_VAL, RLIM64_INFINITY); + test_prlimit_set(rnum, RLIM64_INFINITY, RLIM64_INFINITY); + test_getrlimit64(rnum, RLIM64_INFINITY, RLIM64_INFINITY); + test_getrlimit(rnum, RLIM_INFINITY, RLIM_INFINITY); + + test_setrlimit(rnum, TEST_VAL, RLIM_INFINITY); + test_getrlimit64(rnum, TEST_VAL, RLIM64_INFINITY); + test_prlimit_set(rnum, RLIM_INFINITY, RLIM_INFINITY); + test_getrlimit64(rnum, RLIM64_INFINITY, RLIM64_INFINITY); +#endif + + return 0; +} diff --git a/test/misc/tst-rlimit64.c b/test/misc/tst-rlimit64.c new file mode 100644 index 000000000000..490c6c59022c --- /dev/null +++ b/test/misc/tst-rlimit64.c @@ -0,0 +1 @@ +#include "tst-rlimit.c" -- 2.25.1

6 months, 1 week

[PATCH v2] libpthread/nptl: make default stack size configurable

by Ben Wolsieffer

Threads currently have 2-4 MiB stacks by default (depending on the platform). This is fine on MMU platforms, where this stack space is not actually allocated until it is used, but tends to waste a large amount of memory on no-MMU platforms. This patch adds a PTHREADS_STACK_DEFAULT_SIZE Kconfig option that allows the user to override the default stack size at build time. This allows the user to select a reasonable default stack size for the software that runs on their system, and avoids the need to patch every package to add calls to pthread_attr_setstacksize(). An alternative to this patch would be to change the hardcoded default stack size on no-MMU platforms, but it is difficult to choose an appropriate value because the minimum required stack depends on the software in use. This would also be a breaking change. Signed-off-by: Ben Wolsieffer <ben.wolsieffer(a)hefring.com> --- Changes in v2: * Entirely move default stack size configuration to Kconfig extra/Configs/Config.in | 9 +++++++++ libpthread/nptl/init.c | 14 +++++++------- libpthread/nptl/sysdeps/aarch64/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/alpha/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/arc/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/arm/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/csky/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/i386/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/kvx/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/m68k/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/metag/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/microblaze/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/mips/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/nds32/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/nios2/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/or1k/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/powerpc/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/riscv64/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/sh/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/sparc/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/x86_64/pthreaddef.h | 3 --- libpthread/nptl/sysdeps/xtensa/pthreaddef.h | 3 --- 22 files changed, 16 insertions(+), 67 deletions(-) diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in index 6bbb6f572..c2834f5ec 100644 --- a/extra/Configs/Config.in +++ b/extra/Configs/Config.in @@ -628,6 +628,15 @@ config PTHREADS_DEBUG_SUPPORT If you are doing development and want to debug applications using uClibc's pthread library, answer Y. Otherwise, answer N. +config PTHREADS_STACK_DEFAULT_SIZE + int "Default thread stack size" + default 4194304 if TARGET_alpha # 4 MiB + default 4194304 if TARGET_powerpc # 4 MiB + default 2097152 # 2 MiB + help + Set the default thread stack size. This option is useful on MMU-less + systems where the stack size is fixed and the default stack size may + be excessively large and waste memory. config UCLIBC_HAS_SYSLOG bool "Syslog support" diff --git a/libpthread/nptl/init.c b/libpthread/nptl/init.c index 5d25ded7d..ddc552f2e 100644 --- a/libpthread/nptl/init.c +++ b/libpthread/nptl/init.c @@ -278,17 +278,17 @@ __pthread_initialize_minimal_internal (void) struct rlimit limit; if (getrlimit (RLIMIT_STACK, &limit) != 0 || limit.rlim_cur == RLIM_INFINITY) - /* The system limit is not usable. Use an architecture-specific - default. */ - limit.rlim_cur = ARCH_STACK_DEFAULT_SIZE; - else if (limit.rlim_cur < PTHREAD_STACK_MIN) + /* The system limit is not usable. Use a user-specified or + architecture-specific default. */ + limit.rlim_cur = __PTHREADS_STACK_DEFAULT_SIZE__; + if (limit.rlim_cur < PTHREAD_STACK_MIN) /* The system limit is unusably small. Use the minimal size acceptable. */ limit.rlim_cur = PTHREAD_STACK_MIN; - /* Do not exceed architecture specific default */ - if (limit.rlim_cur > ARCH_STACK_DEFAULT_SIZE) - limit.rlim_cur = ARCH_STACK_DEFAULT_SIZE; + /* Do not exceed the user-specified or architecture-specific default */ + if (limit.rlim_cur > __PTHREADS_STACK_DEFAULT_SIZE__) + limit.rlim_cur = __PTHREADS_STACK_DEFAULT_SIZE__; /* Make sure it meets the minimum size that allocate_stack (allocatestack.c) will demand, which depends on the page size. */ diff --git a/libpthread/nptl/sysdeps/aarch64/pthreaddef.h b/libpthread/nptl/sysdeps/aarch64/pthreaddef.h index d9495f9cb..7172f406b 100644 --- a/libpthread/nptl/sysdeps/aarch64/pthreaddef.h +++ b/libpthread/nptl/sysdeps/aarch64/pthreaddef.h @@ -14,9 +14,6 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/alpha/pthreaddef.h b/libpthread/nptl/sysdeps/alpha/pthreaddef.h index 72a311c33..6b99f3b4f 100644 --- a/libpthread/nptl/sysdeps/alpha/pthreaddef.h +++ b/libpthread/nptl/sysdeps/alpha/pthreaddef.h @@ -15,9 +15,6 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (4 * 1024 * 1024) - /* Required stack pointer alignment at beginning. The ABI requires 16. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/arc/pthreaddef.h b/libpthread/nptl/sysdeps/arc/pthreaddef.h index bf4f0f29a..0fb28dc48 100644 --- a/libpthread/nptl/sysdeps/arc/pthreaddef.h +++ b/libpthread/nptl/sysdeps/arc/pthreaddef.h @@ -17,9 +17,6 @@ #include <sysdep.h> -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 8 diff --git a/libpthread/nptl/sysdeps/arm/pthreaddef.h b/libpthread/nptl/sysdeps/arm/pthreaddef.h index a05ac879d..f790a6dca 100644 --- a/libpthread/nptl/sysdeps/arm/pthreaddef.h +++ b/libpthread/nptl/sysdeps/arm/pthreaddef.h @@ -15,9 +15,6 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. SSE requires 16 bytes. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/csky/pthreaddef.h b/libpthread/nptl/sysdeps/csky/pthreaddef.h index 992fced01..4aa97ee27 100644 --- a/libpthread/nptl/sysdeps/csky/pthreaddef.h +++ b/libpthread/nptl/sysdeps/csky/pthreaddef.h @@ -5,9 +5,6 @@ * in this tarball. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. SSE requires 16 bytes. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/i386/pthreaddef.h b/libpthread/nptl/sysdeps/i386/pthreaddef.h index a0659039d..2fd27113c 100644 --- a/libpthread/nptl/sysdeps/i386/pthreaddef.h +++ b/libpthread/nptl/sysdeps/i386/pthreaddef.h @@ -16,9 +16,6 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. SSE requires 16 bytes. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/kvx/pthreaddef.h b/libpthread/nptl/sysdeps/kvx/pthreaddef.h index 6e1485998..03945bc5f 100644 --- a/libpthread/nptl/sysdeps/kvx/pthreaddef.h +++ b/libpthread/nptl/sysdeps/kvx/pthreaddef.h @@ -6,9 +6,6 @@ * Copyright (C) 2019 Kalray Inc. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 32 diff --git a/libpthread/nptl/sysdeps/m68k/pthreaddef.h b/libpthread/nptl/sysdeps/m68k/pthreaddef.h index 1651b3d5f..04d565191 100644 --- a/libpthread/nptl/sysdeps/m68k/pthreaddef.h +++ b/libpthread/nptl/sysdeps/m68k/pthreaddef.h @@ -15,9 +15,6 @@ License along with the GNU C Library. If not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/metag/pthreaddef.h b/libpthread/nptl/sysdeps/metag/pthreaddef.h index bf4f0f29a..0fb28dc48 100644 --- a/libpthread/nptl/sysdeps/metag/pthreaddef.h +++ b/libpthread/nptl/sysdeps/metag/pthreaddef.h @@ -17,9 +17,6 @@ #include <sysdep.h> -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 8 diff --git a/libpthread/nptl/sysdeps/microblaze/pthreaddef.h b/libpthread/nptl/sysdeps/microblaze/pthreaddef.h index 47e87dd71..a01b59fab 100644 --- a/libpthread/nptl/sysdeps/microblaze/pthreaddef.h +++ b/libpthread/nptl/sysdeps/microblaze/pthreaddef.h @@ -19,9 +19,6 @@ #include <stdlib.h> #include <string.h> -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/mips/pthreaddef.h b/libpthread/nptl/sysdeps/mips/pthreaddef.h index 692988205..adedd7715 100644 --- a/libpthread/nptl/sysdeps/mips/pthreaddef.h +++ b/libpthread/nptl/sysdeps/mips/pthreaddef.h @@ -15,9 +15,6 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/nds32/pthreaddef.h b/libpthread/nptl/sysdeps/nds32/pthreaddef.h index c9d3f7781..0dca16c34 100644 --- a/libpthread/nptl/sysdeps/nds32/pthreaddef.h +++ b/libpthread/nptl/sysdeps/nds32/pthreaddef.h @@ -14,9 +14,6 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. SSE requires 16 bytes. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/nios2/pthreaddef.h b/libpthread/nptl/sysdeps/nios2/pthreaddef.h index 4268252dd..5be435237 100644 --- a/libpthread/nptl/sysdeps/nios2/pthreaddef.h +++ b/libpthread/nptl/sysdeps/nios2/pthreaddef.h @@ -16,9 +16,6 @@ License along with the GNU C Library. If not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 4 diff --git a/libpthread/nptl/sysdeps/or1k/pthreaddef.h b/libpthread/nptl/sysdeps/or1k/pthreaddef.h index e8da3d965..394962172 100644 --- a/libpthread/nptl/sysdeps/or1k/pthreaddef.h +++ b/libpthread/nptl/sysdeps/or1k/pthreaddef.h @@ -16,9 +16,6 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/powerpc/pthreaddef.h b/libpthread/nptl/sysdeps/powerpc/pthreaddef.h index 36bf76404..a46c094b6 100644 --- a/libpthread/nptl/sysdeps/powerpc/pthreaddef.h +++ b/libpthread/nptl/sysdeps/powerpc/pthreaddef.h @@ -15,9 +15,6 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (4 * 1024 * 1024) - /* Required stack pointer alignment at beginning. The ABI requires 16 bytes (for both 32-bit and 64-bit PowerPC). */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/riscv64/pthreaddef.h b/libpthread/nptl/sysdeps/riscv64/pthreaddef.h index fbd40a74f..5a929bc77 100644 --- a/libpthread/nptl/sysdeps/riscv64/pthreaddef.h +++ b/libpthread/nptl/sysdeps/riscv64/pthreaddef.h @@ -14,9 +14,6 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/sh/pthreaddef.h b/libpthread/nptl/sysdeps/sh/pthreaddef.h index fc3ae6029..918aaf54f 100644 --- a/libpthread/nptl/sysdeps/sh/pthreaddef.h +++ b/libpthread/nptl/sysdeps/sh/pthreaddef.h @@ -17,9 +17,6 @@ #include <sysdep.h> -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 8 diff --git a/libpthread/nptl/sysdeps/sparc/pthreaddef.h b/libpthread/nptl/sysdeps/sparc/pthreaddef.h index 435fedcf3..65f6655a4 100644 --- a/libpthread/nptl/sysdeps/sparc/pthreaddef.h +++ b/libpthread/nptl/sysdeps/sparc/pthreaddef.h @@ -15,9 +15,6 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/x86_64/pthreaddef.h b/libpthread/nptl/sysdeps/x86_64/pthreaddef.h index 2b2285285..98ab8cfb1 100644 --- a/libpthread/nptl/sysdeps/x86_64/pthreaddef.h +++ b/libpthread/nptl/sysdeps/x86_64/pthreaddef.h @@ -16,9 +16,6 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. SSE requires 16 bytes. */ #define STACK_ALIGN 16 diff --git a/libpthread/nptl/sysdeps/xtensa/pthreaddef.h b/libpthread/nptl/sysdeps/xtensa/pthreaddef.h index 34c1851c3..13d8fef4c 100644 --- a/libpthread/nptl/sysdeps/xtensa/pthreaddef.h +++ b/libpthread/nptl/sysdeps/xtensa/pthreaddef.h @@ -15,9 +15,6 @@ License along with the GNU C Library; see the file COPYING.LIB. If not, see <http://www.gnu.org/licenses/>. */ -/* Default stack size. */ -#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) - /* Required stack pointer alignment at beginning. */ #define STACK_ALIGN 16 -- 2.42.0

6 months, 1 week

[PATCH] fnmatch: fix possible access beyond of parameter string

by Marcus Haehnel

In certain cases, fnmatch() could access the next byte beyond the end of he passed pattern. A triggering pattern to match is the following invocation: fnmatch("[A-Z[.", "F", 0) The normal A-Z group match gets us to fnmatch_loop.c:421 and then to fnmatch_loop:599. The F in the filaname matches this expression and we end up in fnmatch_loop:867 which handles skipping the rest of a bracked expression that already matched. Here we enter the case where the next chars to parse are a collating symbol starting with "[." (fnmatch_loop:918). Currently the p pointer is then advanced by one, moving it beyond the "." and to the \0 byte of the pattern string (fnmatch_loop:920). Inside the while loop the pointer is then incremented again and immediately dereferenced, reaching beyond the end of the pattern string. The increment before the while loop must be removed, because only inside the while loop (after the other increment) a check for the end of the string is performend. This is sufficient and the check of the end of the collating symbol is only performed if p[1] is at most the terminating \0 byte. Signed-Off-By: Frank Mehnert <frank.mehnert(a)kernkonzept.com> --- libc/misc/fnmatch/fnmatch_loop.c | 1 - 1 file changed, 1 deletion(-) diff --git a/libc/misc/fnmatch/fnmatch_loop.c b/libc/misc/fnmatch/fnmatch_loop.c index 32ee079a3..025510de6 100644 --- a/libc/misc/fnmatch/fnmatch_loop.c +++ b/libc/misc/fnmatch/fnmatch_loop.c @@ -917,7 +917,6 @@ FCT (const CHAR *pattern, const CHAR *string, const CHAR *string_end, } else if (c == L('[') && *p == L('.')) { - ++p; while (1) { c = *++p; -- 2.42.0

6 months, 1 week

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