Merge remote-tracking branch 'aosp/upstream-master' into update am: aa450e62f0

Original change: https://android-review.googlesource.com/c/platform/external/musl/+/2228150

Change-Id: I511d784a9ae3a4e1b6bfe55a35af38d2235fc54a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

41 files changed, 220 insertions, 76 deletions

diff --git a/arch/arm/syscall_arch.h b/arch/arm/syscall_arch.h
index a877b2cf..624e992e 100644
--- a/arch/arm/syscall_arch.h
+++ b/arch/arm/syscall_arch.h
@@ -101,3 +101,10 @@ static inline long __syscall6(long n, long a, long b, long c, long d, long e, lo
 #define SYSCALL_FADVISE_6_ARG
 
 #define SYSCALL_IPC_BROKEN_MODE
+
+#define VDSO_USEFUL
+#define VDSO_CGT32_SYM "__vdso_clock_gettime"
+#define VDSO_CGT32_VER "LINUX_2.6"
+#define VDSO_CGT_SYM "__vdso_clock_gettime64"
+#define VDSO_CGT_VER "LINUX_2.6"
+#define VDSO_CGT_WORKAROUND 1
diff --git a/configure b/configure
index ca5cbc0b..6f5453f5 100755
--- a/configure
+++ b/configure
@@ -723,11 +723,6 @@ fi
 test "$SUBARCH" \
 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
 
-case "$ARCH$SUBARCH" in
-arm) ASMSUBARCH=el ;;
-*) ASMSUBARCH=$SUBARCH ;;
-esac
-
 #
 # Some archs (powerpc) have different possible long double formats
 # that the compiler can be configured for. The logic for whether this
diff --git a/include/elf.h b/include/elf.h
index 86e2f0bb..9e980a29 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -385,7 +385,8 @@ typedef struct {
 #define SHT_PREINIT_ARRAY 16
 #define SHT_GROUP	  17
 #define SHT_SYMTAB_SHNDX  18
-#define	SHT_NUM		  19
+#define SHT_RELR	  19
+#define	SHT_NUM		  20
 #define SHT_LOOS	  0x60000000
 #define SHT_GNU_ATTRIBUTES 0x6ffffff5
 #define SHT_GNU_HASH	  0x6ffffff6
@@ -754,7 +755,10 @@ typedef struct {
 #define DT_PREINIT_ARRAY 32
 #define DT_PREINIT_ARRAYSZ 33
 #define DT_SYMTAB_SHNDX	34
-#define	DT_NUM		35
+#define DT_RELRSZ	35
+#define DT_RELR		36
+#define DT_RELRENT	37
+#define	DT_NUM		38
 #define DT_LOOS		0x6000000d
 #define DT_HIOS		0x6ffff000
 #define DT_LOPROC	0x70000000
diff --git a/include/strings.h b/include/strings.h
index db0960b4..b7a5ea08 100644
--- a/include/strings.h
+++ b/include/strings.h
@@ -5,6 +5,7 @@
 extern "C" {
 #endif
 
+#include <features.h>
 
 #define __NEED_size_t
 #define __NEED_locale_t
diff --git a/include/unistd.h b/include/unistd.h
index 212263a7..0e8149e4 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -425,6 +425,8 @@ pid_t gettid(void);
 #define _SC_XOPEN_STREAMS	246
 #define _SC_THREAD_ROBUST_PRIO_INHERIT	247
 #define _SC_THREAD_ROBUST_PRIO_PROTECT	248
+#define _SC_MINSIGSTKSZ	249
+#define _SC_SIGSTKSZ	250
 
 #define _CS_PATH	0
 #define _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS	1
@@ -467,6 +469,8 @@ pid_t gettid(void);
 #define _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS	1147
 #define _CS_V6_ENV	1148
 #define _CS_V7_ENV	1149
+#define _CS_POSIX_V7_THREADS_CFLAGS	1150
+#define _CS_POSIX_V7_THREADS_LDFLAGS	1151
 
 #ifdef __cplusplus
 }
diff --git a/ldso/dlstart.c b/ldso/dlstart.c
index 20d50f2c..259f5e18 100644
--- a/ldso/dlstart.c
+++ b/ldso/dlstart.c
@@ -140,6 +140,21 @@ hidden void _dlstart_c(size_t *sp, size_t *dynv)
 		size_t *rel_addr = (void *)(base + rel[0]);
 		*rel_addr = base + rel[2];
 	}
+
+	rel = (void *)(base+dyn[DT_RELR]);
+	rel_size = dyn[DT_RELRSZ];
+	size_t *relr_addr = 0;
+	for (; rel_size; rel++, rel_size-=sizeof(size_t)) {
+		if ((rel[0]&1) == 0) {
+			relr_addr = (void *)(base + rel[0]);
+			*relr_addr++ += base;
+		} else {
+			for (size_t i=0, bitmap=rel[0]; bitmap>>=1; i++)
+				if (bitmap&1)
+					relr_addr[i] += base;
+			relr_addr += 8*sizeof(size_t)-1;
+		}
+	}
 #endif
 
 	stage2_func dls2;
diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index 853f6e91..24fe47cf 100644
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -32,7 +32,9 @@
 #define realloc __libc_realloc
 #define free __libc_free
 
-static void error(const char *, ...);
+static void error_impl(const char *, ...);
+static void error_noop(const char *, ...);
+static void (*error)(const char *, ...) = error_noop;
 
 #define MAXP2(a,b) (-(-(a)&-(b)))
 #define ALIGN(x,y) ((x)+(y)-1 & -(y))
@@ -212,7 +214,8 @@ static void decode_vec(size_t *v, size_t *a, size_t cnt)
 	size_t i;
 	for (i=0; i<cnt; i++) a[i] = 0;
 	for (; v[0]; v+=2) if (v[0]-1<cnt-1) {
-		a[0] |= 1UL<<v[0];
+		if (v[0] < 8*sizeof(long))
+			a[0] |= 1UL<<v[0];
 		a[v[0]] = v[1];
 	}
 }
@@ -517,6 +520,23 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri
 	}
 }
 
+static void do_relr_relocs(struct dso *dso, size_t *relr, size_t relr_size)
+{
+	unsigned char *base = dso->base;
+	size_t *reloc_addr;
+	for (; relr_size; relr++, relr_size-=sizeof(size_t))
+		if ((relr[0]&1) == 0) {
+			reloc_addr = laddr(dso, relr[0]);
+			*reloc_addr++ += (size_t)base;
+		} else {
+			int i = 0;
+			for (size_t bitmap=relr[0]; (bitmap>>=1); i++)
+				if (bitmap&1)
+					reloc_addr[i] += (size_t)base;
+			reloc_addr += 8*sizeof(size_t)-1;
+		}
+}
+
 static void redo_lazy_relocs()
 {
 	struct dso *p = lazy_head, *next;
@@ -870,7 +890,7 @@ static int fixup_rpath(struct dso *p, char *buf, size_t buf_size)
 		case ENOENT:
 		case ENOTDIR:
 		case EACCES:
-			break;
+			return 0;
 		default:
 			return -1;
 		}
@@ -1359,13 +1379,17 @@ static void reloc_all(struct dso *p)
 			2+(dyn[DT_PLTREL]==DT_RELA));
 		do_relocs(p, laddr(p, dyn[DT_REL]), dyn[DT_RELSZ], 2);
 		do_relocs(p, laddr(p, dyn[DT_RELA]), dyn[DT_RELASZ], 3);
-
-		if (head != &ldso && p->relro_start != p->relro_end &&
-		    mprotect(laddr(p, p->relro_start), p->relro_end-p->relro_start, PROT_READ)
-		    && errno != ENOSYS) {
-			error("Error relocating %s: RELRO protection failed: %m",
-				p->name);
-			if (runtime) longjmp(*rtld_fail, 1);
+		if (!DL_FDPIC)
+			do_relr_relocs(p, laddr(p, dyn[DT_RELR]), dyn[DT_RELRSZ]);
+
+		if (head != &ldso && p->relro_start != p->relro_end) {
+			long ret = __syscall(SYS_mprotect, laddr(p, p->relro_start),
+				p->relro_end-p->relro_start, PROT_READ);
+			if (ret != 0 && ret != -ENOSYS) {
+				error("Error relocating %s: RELRO protection failed: %m",
+					p->name);
+				if (runtime) longjmp(*rtld_fail, 1);
+			}
 		}
 
 		p->relocated = 1;
@@ -1762,6 +1786,9 @@ void __dls3(size_t *sp, size_t *auxv)
 		env_preload = getenv("LD_PRELOAD");
 	}
 
+	/* Activate error handler function */
+	error = error_impl;
+
 	/* If the main program was already loaded by the kernel,
 	 * AT_PHDR will point to some location other than the dynamic
 	 * linker's program headers. */
@@ -2357,7 +2384,7 @@ int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void
 	return ret;
 }
 
-static void error(const char *fmt, ...)
+static void error_impl(const char *fmt, ...)
 {
 	va_list ap;
 	va_start(ap, fmt);
@@ -2371,3 +2398,7 @@ static void error(const char *fmt, ...)
 	__dl_vseterr(fmt, ap);
 	va_end(ap);
 }
+
+static void error_noop(const char *fmt, ...)
+{
+}
diff --git a/sources.bp b/sources.bp
index 0e63694b..30e10321 100644
--- a/sources.bp
+++ b/sources.bp
@@ -1353,6 +1353,7 @@ cc_defaults {
                 "src/math/aarch64/sqrtf.c",
                 "src/math/aarch64/trunc.c",
                 "src/math/aarch64/truncf.c",
+                "src/process/aarch64/vfork.s",
                 "src/setjmp/aarch64/longjmp.s",
                 "src/setjmp/aarch64/setjmp.s",
                 "src/signal/aarch64/restore.s",
@@ -1395,6 +1396,7 @@ cc_defaults {
                 "src/math/sqrtf.c",
                 "src/math/trunc.c",
                 "src/math/truncf.c",
+                "src/process/vfork.c",
                 "src/setjmp/longjmp.c",
                 "src/setjmp/setjmp.c",
                 "src/signal/restore.c",
diff --git a/src/conf/confstr.c b/src/conf/confstr.c
index 02cb1aa2..3d417284 100644
--- a/src/conf/confstr.c
+++ b/src/conf/confstr.c
@@ -7,7 +7,7 @@ size_t confstr(int name, char *buf, size_t len)
 	const char *s = "";
 	if (!name) {
 		s = "/bin:/usr/bin";
-	} else if ((name&~4U)!=1 && name-_CS_POSIX_V6_ILP32_OFF32_CFLAGS>33U) {
+	} else if ((name&~4U)!=1 && name-_CS_POSIX_V6_ILP32_OFF32_CFLAGS>35U) {
 		errno = EINVAL;
 		return 0;
 	}
diff --git a/src/conf/sysconf.c b/src/conf/sysconf.c
index 3baaed32..60d3e745 100644
--- a/src/conf/sysconf.c
+++ b/src/conf/sysconf.c
@@ -4,6 +4,7 @@
 #include <sys/resource.h>
 #include <signal.h>
 #include <sys/sysinfo.h>
+#include <sys/auxv.h>
 #include "syscall.h"
 #include "libc.h"
 
@@ -19,6 +20,8 @@
 #define JT_AVPHYS_PAGES JT(9)
 #define JT_ZERO JT(10)
 #define JT_DELAYTIMER_MAX JT(11)
+#define JT_MINSIGSTKSZ JT(12)
+#define JT_SIGSTKSZ JT(13)
 
 #define RLIM(x) (-32768|(RLIMIT_ ## x))
 
@@ -165,6 +168,9 @@ long sysconf(int name)
 		[_SC_XOPEN_STREAMS] = JT_ZERO,
 		[_SC_THREAD_ROBUST_PRIO_INHERIT] = -1,
 		[_SC_THREAD_ROBUST_PRIO_PROTECT] = -1,
+
+		[_SC_MINSIGSTKSZ] = JT_MINSIGSTKSZ,
+		[_SC_SIGSTKSZ] = JT_SIGSTKSZ,
 	};
 
 	if (name >= sizeof(values)/sizeof(values[0]) || !values[name]) {
@@ -212,6 +218,13 @@ long sysconf(int name)
 		mem *= si.mem_unit;
 		mem /= PAGE_SIZE;
 		return (mem > LONG_MAX) ? LONG_MAX : mem;
+	case JT_MINSIGSTKSZ & 255:
+	case JT_SIGSTKSZ & 255: ;
+		long val = __getauxval(AT_MINSIGSTKSZ);
+		if (val < MINSIGSTKSZ) val = MINSIGSTKSZ;
+		if (values[name] == JT_SIGSTKSZ)
+			val += SIGSTKSZ - MINSIGSTKSZ;
+		return val;
 	case JT_ZERO & 255:
 		return 0;
 	}
diff --git a/src/include/sys/stat.h b/src/include/sys/stat.h
new file mode 100644
index 00000000..59339bee
--- /dev/null
+++ b/src/include/sys/stat.h
@@ -0,0 +1,9 @@
+#ifndef SYS_STAT_H
+#define SYS_STAT_H
+
+#include "../../../include/sys/stat.h"
+
+hidden int __fstat(int, struct stat *);
+hidden int __fstatat(int, const char *restrict, struct stat *restrict, int);
+
+#endif
diff --git a/src/internal/dynlink.h b/src/internal/dynlink.h
index 51c0639f..830354eb 100644
--- a/src/internal/dynlink.h
+++ b/src/internal/dynlink.h
@@ -93,7 +93,7 @@ struct fdpic_dummy_loadmap {
 #endif
 
 #define AUX_CNT 32
-#define DYN_CNT 32
+#define DYN_CNT 37
 
 typedef void (*stage2_func)(unsigned char *, size_t *);
 
diff --git a/src/internal/syscall.h b/src/internal/syscall.h
index d5f294d4..4a446157 100644
--- a/src/internal/syscall.h
+++ b/src/internal/syscall.h
@@ -58,7 +58,7 @@ hidden long __syscall_ret(unsigned long),
 #define __syscall_cp(...) __SYSCALL_DISP(__syscall_cp,__VA_ARGS__)
 #define syscall_cp(...) __syscall_ret(__syscall_cp(__VA_ARGS__))
 
-static inline long __alt_socketcall(int sys, int sock, int cp, long a, long b, long c, long d, long e, long f)
+static inline long __alt_socketcall(int sys, int sock, int cp, syscall_arg_t a, syscall_arg_t b, syscall_arg_t c, syscall_arg_t d, syscall_arg_t e, syscall_arg_t f)
 {
 	long r;
 	if (cp) r = __syscall_cp(sys, a, b, c, d, e, f);
@@ -71,9 +71,9 @@ static inline long __alt_socketcall(int sys, int sock, int cp, long a, long b, l
 	return r;
 }
 #define __socketcall(nm, a, b, c, d, e, f) __alt_socketcall(SYS_##nm, __SC_##nm, 0, \
-	(long)(a), (long)(b), (long)(c), (long)(d), (long)(e), (long)(f))
+	__scc(a), __scc(b), __scc(c), __scc(d), __scc(e), __scc(f))
 #define __socketcall_cp(nm, a, b, c, d, e, f) __alt_socketcall(SYS_##nm, __SC_##nm, 1, \
-	(long)(a), (long)(b), (long)(c), (long)(d), (long)(e), (long)(f))
+	__scc(a), __scc(b), __scc(c), __scc(d), __scc(e), __scc(f))
 
 /* fixup legacy 16-bit junk */
 
@@ -201,43 +201,43 @@ static inline long __alt_socketcall(int sys, int sock, int cp, long a, long b, l
 #define SYS_sendfile SYS_sendfile64
 #endif
 
-#ifndef SYS_timer_settime
+#ifdef SYS_timer_settime32
 #define SYS_timer_settime SYS_timer_settime32
 #endif
 
-#ifndef SYS_timer_gettime
+#ifdef SYS_timer_gettime32
 #define SYS_timer_gettime SYS_timer_gettime32
 #endif
 
-#ifndef SYS_timerfd_settime
+#ifdef SYS_timerfd_settime32
 #define SYS_timerfd_settime SYS_timerfd_settime32
 #endif
 
-#ifndef SYS_timerfd_gettime
+#ifdef SYS_timerfd_gettime32
 #define SYS_timerfd_gettime SYS_timerfd_gettime32
 #endif
 
-#ifndef SYS_clock_settime
+#ifdef SYS_clock_settime32
 #define SYS_clock_settime SYS_clock_settime32
 #endif
 
-#ifndef SYS_clock_gettime
+#ifdef SYS_clock_gettime32
 #define SYS_clock_gettime SYS_clock_gettime32
 #endif
 
-#ifndef SYS_clock_getres
+#ifdef SYS_clock_getres_time32
 #define SYS_clock_getres SYS_clock_getres_time32
 #endif
 
-#ifndef SYS_clock_nanosleep
+#ifdef SYS_clock_nanosleep_time32
 #define SYS_clock_nanosleep SYS_clock_nanosleep_time32
 #endif
 
-#ifndef SYS_gettimeofday
+#ifdef SYS_gettimeofday_time32
 #define SYS_gettimeofday SYS_gettimeofday_time32
 #endif
 
-#ifndef SYS_settimeofday
+#ifdef SYS_settimeofday_time32
 #define SYS_settimeofday SYS_settimeofday_time32
 #endif
 
diff --git a/src/linux/epoll.c b/src/linux/epoll.c
index 93baa814..e56e8f4c 100644
--- a/src/linux/epoll.c
+++ b/src/linux/epoll.c
@@ -5,6 +5,7 @@
 
 int epoll_create(int size)
 {
+	if (size<=0) return __syscall_ret(-EINVAL);
 	return epoll_create1(0);
 }
 
diff --git a/src/linux/membarrier.c b/src/linux/membarrier.c
index 343f7360..f64fe7e1 100644
--- a/src/linux/membarrier.c
+++ b/src/linux/membarrier.c
@@ -35,7 +35,7 @@ int __membarrier(int cmd, int flags)
 		__tl_lock();
 		sem_init(&barrier_sem, 0, 0);
 		struct sigaction sa = {
-			.sa_flags = SA_RESTART,
+			.sa_flags = SA_RESTART | SA_ONSTACK,
 			.sa_handler = bcast_barrier
 		};
 		memset(&sa.sa_mask, -1, sizeof sa.sa_mask);
diff --git a/src/misc/getrlimit.c b/src/misc/getrlimit.c
index 2ab2f0f4..bf676307 100644
--- a/src/misc/getrlimit.c
+++ b/src/misc/getrlimit.c
@@ -6,12 +6,13 @@
 
 int getrlimit(int resource, struct rlimit *rlim)
 {
-	unsigned long k_rlim[2];
 	int ret = syscall(SYS_prlimit64, 0, resource, 0, rlim);
 	if (!ret) {
 		FIX(rlim->rlim_cur);
 		FIX(rlim->rlim_max);
 	}
+#ifdef SYS_getrlimit
+	unsigned long k_rlim[2];
 	if (!ret || errno != ENOSYS)
 		return ret;
 	if (syscall(SYS_getrlimit, resource, k_rlim) < 0)
@@ -21,6 +22,9 @@ int getrlimit(int resource, struct rlimit *rlim)
 	FIX(rlim->rlim_cur);
 	FIX(rlim->rlim_max);
 	return 0;
+#else
+	return ret;
+#endif
 }
 
 weak_alias(getrlimit, getrlimit64);
diff --git a/src/misc/mntent.c b/src/misc/mntent.c
index eabb8200..d404fbe3 100644
--- a/src/misc/mntent.c
+++ b/src/misc/mntent.c
@@ -2,6 +2,7 @@
 #include <string.h>
 #include <mntent.h>
 #include <errno.h>
+#include <limits.h>
 
 static char *internal_buf;
 static size_t internal_bufsize;
@@ -21,7 +22,8 @@ int endmntent(FILE *f)
 
 struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int buflen)
 {
-	int cnt, n[8], use_internal = (linebuf == SENTINEL);
+	int n[8], use_internal = (linebuf == SENTINEL);
+	size_t len, i;
 
 	mnt->mnt_freq = 0;
 	mnt->mnt_passno = 0;
@@ -39,10 +41,14 @@ struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int bufle
 			errno = ERANGE;
 			return 0;
 		}
-		cnt = sscanf(linebuf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
+
+		len = strlen(linebuf);
+		if (len > INT_MAX) continue;
+		for (i = 0; i < sizeof n / sizeof *n; i++) n[i] = len;
+		sscanf(linebuf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
 			n, n+1, n+2, n+3, n+4, n+5, n+6, n+7,
 			&mnt->mnt_freq, &mnt->mnt_passno);
-	} while (cnt < 2 || linebuf[n[0]] == '#');
+	} while (linebuf[n[0]] == '#' || n[1]==len);
 
 	linebuf[n[1]] = 0;
 	linebuf[n[3]] = 0;
diff --git a/src/misc/setrlimit.c b/src/misc/setrlimit.c
index 8340aee0..5b713cf3 100644
--- a/src/misc/setrlimit.c
+++ b/src/misc/setrlimit.c
@@ -12,12 +12,14 @@ struct ctx {
 	int err;
 };
 
+#ifdef SYS_setrlimit
 static void do_setrlimit(void *p)
 {
 	struct ctx *c = p;
 	if (c->err>0) return;
 	c->err = -__syscall(SYS_setrlimit, c->res, c->lim);
 }
+#endif
 
 int setrlimit(int resource, const struct rlimit *rlim)
 {
@@ -29,6 +31,7 @@ int setrlimit(int resource, const struct rlimit *rlim)
 		rlim = &tmp;
 	}
 	int ret = __syscall(SYS_prlimit64, 0, resource, rlim, 0);
+#ifdef SYS_setrlimit
 	if (ret != -ENOSYS) return __syscall_ret(ret);
 
 	struct ctx c = {
@@ -42,6 +45,9 @@ int setrlimit(int resource, const struct rlimit *rlim)
 		return -1;
 	}
 	return 0;
+#else
+	return __syscall_ret(ret);
+#endif
 }
 
 weak_alias(setrlimit, setrlimit64);
diff --git a/src/network/getaddrinfo.c b/src/network/getaddrinfo.c
index efaab306..9df045f6 100644
--- a/src/network/getaddrinfo.c
+++ b/src/network/getaddrinfo.c
@@ -66,9 +66,11 @@ int getaddrinfo(const char *restrict host, const char *restrict serv, const stru
 				pthread_setcancelstate(
 					PTHREAD_CANCEL_DISABLE, &cs);
 				int r = connect(s, ta[i], tl[i]);
+				int saved_errno = errno;
 				pthread_setcancelstate(cs, 0);
 				close(s);
 				if (!r) continue;
+				errno = saved_errno;
 			}
 			switch (errno) {
 			case EADDRNOTAVAIL:
diff --git a/src/network/gethostbyaddr_r.c b/src/network/gethostbyaddr_r.c
index 0f1e61aa..ceaf3935 100644
--- a/src/network/gethostbyaddr_r.c
+++ b/src/network/gethostbyaddr_r.c
@@ -54,10 +54,11 @@ int gethostbyaddr_r(const void *a, socklen_t l, int af,
 	case EAI_OVERFLOW:
 		return ERANGE;
 	default:
-	case EAI_MEMORY:
-	case EAI_SYSTEM:
 	case EAI_FAIL:
 		*err = NO_RECOVERY;
+		return EBADMSG;
+	case EAI_SYSTEM:
+		*err = NO_RECOVERY;
 		return errno;
 	case 0:
 		break;
diff --git a/src/network/gethostbyname2_r.c b/src/network/gethostbyname2_r.c
index fc894877..c9f3acc4 100644
--- a/src/network/gethostbyname2_r.c
+++ b/src/network/gethostbyname2_r.c
@@ -22,7 +22,7 @@ int gethostbyname2_r(const char *name, int af,
 	if (cnt<0) switch (cnt) {
 	case EAI_NONAME:
 		*err = HOST_NOT_FOUND;
-		return ENOENT;
+		return 0;
 	case EAI_AGAIN:
 		*err = TRY_AGAIN;
 		return EAGAIN;
@@ -30,7 +30,6 @@ int gethostbyname2_r(const char *name, int af,
 	case EAI_FAIL:
 		*err = NO_RECOVERY;
 		return EBADMSG;
-	case EAI_MEMORY:
 	case EAI_SYSTEM:
 		*err = NO_RECOVERY;
 		return errno;
diff --git a/src/network/lookup_name.c b/src/network/lookup_name.c
index aa558c19..bec6ba22 100644
--- a/src/network/lookup_name.c
+++ b/src/network/lookup_name.c
@@ -153,8 +153,11 @@ static int name_from_dns(struct address buf[static MAXADDRS], char canon[static
 			qlens[nq] = __res_mkquery(0, name, 1, afrr[i].rr,
 				0, 0, 0, qbuf[nq], sizeof *qbuf);
 			if (qlens[nq] == -1)
-				return EAI_NONAME;
+				return 0;
 			qbuf[nq][3] = 0; /* don't need AD flag */
+			/* Ensure query IDs are distinct. */
+			if (nq && qbuf[nq][0] == qbuf[0][0])
+				qbuf[nq][0]++;
 			nq++;
 		}
 	}
diff --git a/src/network/netlink.h b/src/network/netlink.h
index 38acb178..873fabe2 100644
--- a/src/network/netlink.h
+++ b/src/network/netlink.h
@@ -86,7 +86,7 @@ struct ifaddrmsg {
 #define RTA_DATALEN(rta)	((rta)->rta_len-sizeof(struct rtattr))
 #define RTA_DATAEND(rta)	((char*)(rta)+(rta)->rta_len)
 #define RTA_NEXT(rta)		(struct rtattr*)((char*)(rta)+NETLINK_ALIGN((rta)->rta_len))
-#define RTA_OK(nlh,end)		((char*)(end)-(char*)(rta) >= sizeof(struct rtattr))
+#define RTA_OK(rta,end)		((char*)(end)-(char*)(rta) >= sizeof(struct rtattr))
 
 #define NLMSG_RTA(nlh,len)	((void*)((char*)(nlh)+sizeof(struct nlmsghdr)+NETLINK_ALIGN(len)))
 #define NLMSG_RTAOK(rta,nlh)	RTA_OK(rta,NLMSG_DATAEND(nlh))
diff --git a/src/network/res_mkquery.c b/src/network/res_mkquery.c
index 33f50cb9..614bf786 100644
--- a/src/network/res_mkquery.c
+++ b/src/network/res_mkquery.c
@@ -13,6 +13,7 @@ int __res_mkquery(int op, const char *dname, int class, int type,
 	int n;
 
 	if (l && dname[l-1]=='.') l--;
+	if (l && dname[l-1]=='.') return -1;
 	n = 17+l+!!l;
 	if (l>253 || buflen<n || op>15u || class>255u || type>255u)
 		return -1;
diff --git a/src/network/res_msend.c b/src/network/res_msend.c
index 3e018009..9adaea13 100644
--- a/src/network/res_msend.c
+++ b/src/network/res_msend.c
@@ -68,14 +68,20 @@ int __res_msend_rc(int nqueries, const unsigned char *const *queries,
 	}
 
 	/* Get local address and open/bind a socket */
-	sa.sin.sin_family = family;
 	fd = socket(family, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 
 	/* Handle case where system lacks IPv6 support */
 	if (fd < 0 && family == AF_INET6 && errno == EAFNOSUPPORT) {
+		for (i=0; i<nns && conf->ns[nns].family == AF_INET6; i++);
+		if (i==nns) {
+			pthread_setcancelstate(cs, 0);
+			return -1;
+		}
 		fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 		family = AF_INET;
+		sl = sizeof sa.sin;
 	}
+	sa.sin.sin_family = family;
 	if (fd < 0 || bind(fd, (void *)&sa, sl) < 0) {
 		if (fd >= 0) close(fd);
 		pthread_setcancelstate(cs, 0);
diff --git a/src/process/aarch64/vfork.s b/src/process/aarch64/vfork.s
new file mode 100644
index 00000000..429bec8c
--- /dev/null
+++ b/src/process/aarch64/vfork.s
@@ -0,0 +1,9 @@
+.global vfork
+.type vfork,%function
+vfork:
+	mov x8, 220    // SYS_clone
+	mov x0, 0x4111 // SIGCHLD | CLONE_VM | CLONE_VFORK
+	mov x1, 0
+	svc 0
+	.hidden __syscall_ret
+	b __syscall_ret
diff --git a/src/stat/fchmodat.c b/src/stat/fchmodat.c
index 4ee00b0a..bc581050 100644
--- a/src/stat/fchmodat.c
+++ b/src/stat/fchmodat.c
@@ -2,7 +2,6 @@
 #include <fcntl.h>
 #include <errno.h>
 #include "syscall.h"
-#include "kstat.h"
 
 int fchmodat(int fd, const char *path, mode_t mode, int flag)
 {
@@ -11,12 +10,12 @@ int fchmodat(int fd, const char *path, mode_t mode, int flag)
 	if (flag != AT_SYMLINK_NOFOLLOW)
 		return __syscall_ret(-EINVAL);
 
-	struct kstat st;
+	struct stat st;
 	int ret, fd2;
 	char proc[15+3*sizeof(int)];
 
-	if ((ret = __syscall(SYS_fstatat, fd, path, &st, flag)))
-		return __syscall_ret(ret);
+	if (fstatat(fd, path, &st, flag))
+		return -1;
 	if (S_ISLNK(st.st_mode))
 		return __syscall_ret(-EOPNOTSUPP);
 
@@ -27,12 +26,12 @@ int fchmodat(int fd, const char *path, mode_t mode, int flag)
 	}
 
 	__procfdname(proc, fd2);
-	ret = __syscall(SYS_fstatat, AT_FDCWD, proc, &st, 0);
+	ret = stat(proc, &st);
 	if (!ret) {
-		if (S_ISLNK(st.st_mode)) ret = -EOPNOTSUPP;
-		else ret = __syscall(SYS_fchmodat, AT_FDCWD, proc, mode);
+		if (S_ISLNK(st.st_mode)) ret = __syscall_ret(-EOPNOTSUPP);
+		else ret = syscall(SYS_fchmodat, AT_FDCWD, proc, mode);
 	}
 
 	__syscall(SYS_close, fd2);
-	return __syscall_ret(ret);
+	return ret;
 }
diff --git a/src/stat/fstat.c b/src/stat/fstat.c
index 9bbb46de..27db0ccb 100644
--- a/src/stat/fstat.c
+++ b/src/stat/fstat.c
@@ -4,12 +4,14 @@
 #include <fcntl.h>
 #include "syscall.h"
 
-int fstat(int fd, struct stat *st)
+int __fstat(int fd, struct stat *st)
 {
 	if (fd<0) return __syscall_ret(-EBADF);
-	return fstatat(fd, "", st, AT_EMPTY_PATH);
+	return __fstatat(fd, "", st, AT_EMPTY_PATH);
 }
 
+weak_alias(__fstat, fstat);
+
 #if !_REDIR_TIME64
 weak_alias(fstat, fstat64);
 #endif
diff --git a/src/stat/fstatat.c b/src/stat/fstatat.c
index de165b5c..74c51cf5 100644
--- a/src/stat/fstatat.c
+++ b/src/stat/fstatat.c
@@ -6,7 +6,6 @@
 #include <stdint.h>
 #include <sys/sysmacros.h>
 #include "syscall.h"
-#include "kstat.h"
 
 struct statx {
 	uint32_t stx_mask;
@@ -69,6 +68,10 @@ static int fstatat_statx(int fd, const char *restrict path, struct stat *restric
 	return 0;
 }
 
+#ifdef SYS_fstatat
+
+#include "kstat.h"
+
 static int fstatat_kstat(int fd, const char *restrict path, struct stat *restrict st, int flag)
 {
 	int ret;
@@ -130,18 +133,25 @@ static int fstatat_kstat(int fd, const char *restrict path, struct stat *restric
 
 	return 0;
 }
+#endif
 
-int fstatat(int fd, const char *restrict path, struct stat *restrict st, int flag)
+int __fstatat(int fd, const char *restrict path, struct stat *restrict st, int flag)
 {
 	int ret;
+#ifdef SYS_fstatat
 	if (sizeof((struct kstat){0}.st_atime_sec) < sizeof(time_t)) {
 		ret = fstatat_statx(fd, path, st, flag);
 		if (ret!=-ENOSYS) return __syscall_ret(ret);
 	}
 	ret = fstatat_kstat(fd, path, st, flag);
+#else
+	ret = fstatat_statx(fd, path, st, flag);
+#endif
 	return __syscall_ret(ret);
 }
 
+weak_alias(__fstatat, fstatat);
+
 #if !_REDIR_TIME64
 weak_alias(fstatat, fstatat64);
 #endif
diff --git a/src/stdio/freopen.c b/src/stdio/freopen.c
index 615d4b47..96bfbb42 100644
--- a/src/stdio/freopen.c
+++ b/src/stdio/freopen.c
@@ -40,6 +40,8 @@ FILE *freopen(const char *restrict filename, const char *restrict mode, FILE *re
 		fclose(f2);
 	}
 
+	f->mode = 0;
+	f->locale = 0;
 	FUNLOCK(f);
 	return f;
 
diff --git a/src/stdio/open_wmemstream.c b/src/stdio/open_wmemstream.c
index ed1b561d..b8ae4a79 100644
--- a/src/stdio/open_wmemstream.c
+++ b/src/stdio/open_wmemstream.c
@@ -40,8 +40,12 @@ fail:
 static size_t wms_write(FILE *f, const unsigned char *buf, size_t len)
 {
 	struct cookie *c = f->cookie;
-	size_t len2;
+	size_t len2 = f->wpos - f->wbase;
 	wchar_t *newbuf;
+	if (len2) {
+		f->wpos = f->wbase;
+		if (wms_write(f, f->wbase, len2) < len2) return 0;
+	}
 	if (len + c->pos >= c->space) {
 		len2 = 2*c->space+1 | c->pos+len+1;
 		if (len2 > SSIZE_MAX/4) return 0;
diff --git a/src/stdio/tempnam.c b/src/stdio/tempnam.c
index 565df6b6..0c65b1f0 100644
--- a/src/stdio/tempnam.c
+++ b/src/stdio/tempnam.c
@@ -6,7 +6,6 @@
 #include <string.h>
 #include <stdlib.h>
 #include "syscall.h"
-#include "kstat.h"
 
 #define MAXTRIES 100
 
@@ -37,11 +36,10 @@ char *tempnam(const char *dir, const char *pfx)
 
 	for (try=0; try<MAXTRIES; try++) {
 		__randname(s+l-6);
-#ifdef SYS_lstat
-		r = __syscall(SYS_lstat, s, &(struct kstat){0});
+#ifdef SYS_readlink
+		r = __syscall(SYS_readlink, s, (char[1]){0}, 1);
 #else
-		r = __syscall(SYS_fstatat, AT_FDCWD, s,
-			&(struct kstat){0}, AT_SYMLINK_NOFOLLOW);
+		r = __syscall(SYS_readlinkat, AT_FDCWD, s, (char[1]){0}, 1);
 #endif
 		if (r == -ENOENT) return strdup(s);
 	}
diff --git a/src/stdio/tmpnam.c b/src/stdio/tmpnam.c
index d667a836..71dc8bb1 100644
--- a/src/stdio/tmpnam.c
+++ b/src/stdio/tmpnam.c
@@ -5,7 +5,6 @@
 #include <string.h>
 #include <stdlib.h>
 #include "syscall.h"
-#include "kstat.h"
 
 #define MAXTRIES 100
 
@@ -17,11 +16,10 @@ char *tmpnam(char *buf)
 	int r;
 	for (try=0; try<MAXTRIES; try++) {
 		__randname(s+12);
-#ifdef SYS_lstat
-		r = __syscall(SYS_lstat, s, &(struct kstat){0});
+#ifdef SYS_readlink
+		r = __syscall(SYS_readlink, s, (char[1]){0}, 1);
 #else
-		r = __syscall(SYS_fstatat, AT_FDCWD, s,
-			&(struct kstat){0}, AT_SYMLINK_NOFOLLOW);
+		r = __syscall(SYS_readlinkat, AT_FDCWD, s, (char[1]){0}, 1);
 #endif
 		if (r == -ENOENT) return strcpy(buf ? buf : internal, s);
 	}
diff --git a/src/stdlib/qsort_nr.c b/src/stdlib/qsort_nr.c
index efe7ccec..8ffe71d0 100644
--- a/src/stdlib/qsort_nr.c
+++ b/src/stdlib/qsort_nr.c
@@ -10,5 +10,5 @@ static int wrapper_cmp(const void *v1, const void *v2, void *cmp)
 
 void qsort(void *base, size_t nel, size_t width, cmpfun cmp)
 {
-	__qsort_r(base, nel, width, wrapper_cmp, cmp);
+	__qsort_r(base, nel, width, wrapper_cmp, (void *)cmp);
 }
diff --git a/src/temp/__randname.c b/src/temp/__randname.c
index 2bce37a0..e9b970f1 100644
--- a/src/temp/__randname.c
+++ b/src/temp/__randname.c
@@ -1,5 +1,6 @@
 #include <time.h>
 #include <stdint.h>
+#include "pthread_impl.h"
 
 /* This assumes that a check for the
    template size has already been made */
@@ -10,7 +11,7 @@ char *__randname(char *template)
 	unsigned long r;
 
 	__clock_gettime(CLOCK_REALTIME, &ts);
-	r = ts.tv_nsec*65537 ^ (uintptr_t)&ts / 16 + (uintptr_t)template;
+	r = ts.tv_sec + ts.tv_nsec + __pthread_self()->tid * 65537UL;
 	for (i=0; i<6; i++, r>>=5)
 		template[i] = 'A'+(r&15)+(r&16)*2;
 
diff --git a/src/thread/pthread_cancel.c b/src/thread/pthread_cancel.c
index 2f9d5e97..2d3a98ea 100644
--- a/src/thread/pthread_cancel.c
+++ b/src/thread/pthread_cancel.c
@@ -77,7 +77,7 @@ void __testcancel()
 static void init_cancellation()
 {
 	struct sigaction sa = {
-		.sa_flags = SA_SIGINFO | SA_RESTART,
+		.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK,
 		.sa_sigaction = cancel_handler
 	};
 	memset(&sa.sa_mask, -1, _NSIG/8);
diff --git a/src/thread/synccall.c b/src/thread/synccall.c
index d58c851f..a6b177c0 100644
--- a/src/thread/synccall.c
+++ b/src/thread/synccall.c
@@ -45,7 +45,7 @@ void __synccall(void (*func)(void *), void *ctx)
 {
 	sigset_t oldmask;
 	int cs, i, r;
-	struct sigaction sa = { .sa_flags = SA_RESTART, .sa_handler = handler };
+	struct sigaction sa = { .sa_flags = SA_RESTART | SA_ONSTACK, .sa_handler = handler };
 	pthread_t self = __pthread_self(), td;
 	int count = 0;
 
diff --git a/src/time/__map_file.c b/src/time/__map_file.c
index d3cefa82..c2b29fe8 100644
--- a/src/time/__map_file.c
+++ b/src/time/__map_file.c
@@ -2,15 +2,14 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 #include "syscall.h"
-#include "kstat.h"
 
 const char unsigned *__map_file(const char *pathname, size_t *size)
 {
-	struct kstat st;
+	struct stat st;
 	const unsigned char *map = MAP_FAILED;
 	int fd = sys_open(pathname, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
 	if (fd < 0) return 0;
-	if (!syscall(SYS_fstat, fd, &st)) {
+	if (!__fstat(fd, &st)) {
 		map = __mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
 		*size = st.st_size;
 	}
diff --git a/src/time/clock_getcpuclockid.c b/src/time/clock_getcpuclockid.c
index 8a0e2d4c..bce1e8ab 100644
--- a/src/time/clock_getcpuclockid.c
+++ b/src/time/clock_getcpuclockid.c
@@ -8,6 +8,7 @@ int clock_getcpuclockid(pid_t pid, clockid_t *clk)
 	struct timespec ts;
 	clockid_t id = (-pid-1)*8U + 2;
 	int ret = __syscall(SYS_clock_getres, id, &ts);
+	if (ret == -EINVAL) ret = -ESRCH;
 	if (ret) return -ret;
 	*clk = id;
 	return 0;
diff --git a/src/time/clock_gettime.c b/src/time/clock_gettime.c
index 3e1d0975..4d2ec22f 100644
--- a/src/time/clock_gettime.c
+++ b/src/time/clock_gettime.c
@@ -42,6 +42,9 @@ static int cgt_init(clockid_t clk, struct timespec *ts)
 			p = cgt_time32_wrap;
 		}
 	}
+#ifdef VDSO_CGT_WORKAROUND
+	if (!__vdsosym(VDSO_CGT32_VER, VDSO_CGT32_SYM)) p = 0;
+#endif
 #endif
 	int (*f)(clockid_t, struct timespec *) =
 		(int (*)(clockid_t, struct timespec *))p;
@@ -80,10 +83,12 @@ int __clock_gettime(clockid_t clk, struct timespec *ts)
 		return __syscall_ret(r);
 	long ts32[2];
 	r = __syscall(SYS_clock_gettime, clk, ts32);
+#ifdef SYS_gettimeofday
 	if (r==-ENOSYS && clk==CLOCK_REALTIME) {
 		r = __syscall(SYS_gettimeofday, ts32, 0);
 		ts32[1] *= 1000;
 	}
+#endif
 	if (!r) {
 		ts->tv_sec = ts32[0];
 		ts->tv_nsec = ts32[1];
@@ -92,6 +97,7 @@ int __clock_gettime(clockid_t clk, struct timespec *ts)
 	return __syscall_ret(r);
 #else
 	r = __syscall(SYS_clock_gettime, clk, ts);
+#ifdef SYS_gettimeofday
 	if (r == -ENOSYS) {
 		if (clk == CLOCK_REALTIME) {
 			__syscall(SYS_gettimeofday, ts, 0);
@@ -100,6 +106,7 @@ int __clock_gettime(clockid_t clk, struct timespec *ts)
 		}
 		r = -EINVAL;
 	}
+#endif
 	return __syscall_ret(r);
 #endif
 }
diff --git a/src/time/timer_create.c b/src/time/timer_create.c
index 4bef2390..cd32c945 100644
--- a/src/time/timer_create.c
+++ b/src/time/timer_create.c
@@ -43,6 +43,8 @@ static void *start(void *arg)
 	union sigval val = args->sev->sigev_value;
 
 	pthread_barrier_wait(&args->b);
+	if (self->cancel)
+		return 0;
 	for (;;) {
 		siginfo_t si;
 		while (sigwaitinfo(SIGTIMER_SET, &si) < 0);
@@ -113,8 +115,10 @@ int timer_create(clockid_t clk, struct sigevent *restrict evp, timer_t *restrict
 		ksev.sigev_signo = SIGTIMER;
 		ksev.sigev_notify = SIGEV_THREAD_ID;
 		ksev.sigev_tid = td->tid;
-		if (syscall(SYS_timer_create, clk, &ksev, &timerid) < 0)
+		if (syscall(SYS_timer_create, clk, &ksev, &timerid) < 0) {
 			timerid = -1;
+			td->cancel = 1;
+		}
 		td->timer_id = timerid;
 		pthread_barrier_wait(&args.b);
 		if (timerid < 0) return -1;