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Message-ID: <C114C09C-C2FD-4435-95DA-85C7219E8D64@arm.com>
Date: Wed, 19 May 2021 08:42:13 +0000
From: Joe Ramsay <Joe.Ramsay@....com>
To: "musl@...ts.openwall.com" <musl@...ts.openwall.com>
Subject: [PATCH] Update some address/pointer types
Hi all,
This patch corrects the use of long/size_t types where it would have
been more appropriate to use uintptr_t, as well as changing uintptr_t
to be based on the compiler-defined __UINTPTR_TYPE__ (and intptr_t to
__INTPTR_TYPE__). The conflation of these types is historically not a
problem, as they are generally all the same size, however a more
precise definition will be necessary for implementations where the
pointer size can be more than 8 bytes.
This patch has been tested against libc-test with gcc 7 on x86 and
clang 9 on AArch64, with no new failures.
Thanks,
Joe
---
include/alltypes.h.in | 4 ++--
include/sys/auxv.h | 2 +-
src/env/__init_tls.c | 4 ++--
src/env/__libc_start_main.c | 3 ++-
src/include/sys/auxv.h | 2 +-
src/internal/libc.h | 5 +++--
src/malloc/mallocng/glue.h | 8 ++++----
src/misc/getauxval.c | 2 +-
8 files changed, 16 insertions(+), 14 deletions(-)
diff --git a/include/alltypes.h.in b/include/alltypes.h.in
index d47aeea9..07f13973 100644
--- a/include/alltypes.h.in
+++ b/include/alltypes.h.in
@@ -3,10 +3,10 @@
#define __USE_TIME_BITS64 1
TYPEDEF unsigned _Addr size_t;
-TYPEDEF unsigned _Addr uintptr_t;
+TYPEDEF __UINTPTR_TYPE__ uintptr_t;
TYPEDEF _Addr ptrdiff_t;
TYPEDEF _Addr ssize_t;
-TYPEDEF _Addr intptr_t;
+TYPEDEF __INTPTR_TYPE__ intptr_t;
TYPEDEF _Addr regoff_t;
TYPEDEF _Reg register_t;
TYPEDEF _Int64 time_t;
diff --git a/include/sys/auxv.h b/include/sys/auxv.h
index ddccf57f..192ebe64 100644
--- a/include/sys/auxv.h
+++ b/include/sys/auxv.h
@@ -8,7 +8,7 @@ extern "C" {
#include <elf.h>
#include <bits/hwcap.h>
-unsigned long getauxval(unsigned long);
+uintptr_t getauxval(unsigned long);
#ifdef __cplusplus
}
diff --git a/src/env/__init_tls.c b/src/env/__init_tls.c
index a93141ed..8096bb37 100644
--- a/src/env/__init_tls.c
+++ b/src/env/__init_tls.c
@@ -79,12 +79,12 @@ typedef Elf64_Phdr Phdr;
extern weak hidden const size_t _DYNAMIC[];
-static void static_init_tls(size_t *aux)
+static void static_init_tls(uintptr_t *aux)
{
unsigned char *p;
size_t n;
Phdr *phdr, *tls_phdr=0;
- size_t base = 0;
+ uintptr_t base = 0;
void *mem;
for (p=(void *)aux[AT_PHDR],n=aux[AT_PHNUM]; n; n--,p+=aux[AT_PHENT]) {
diff --git a/src/env/__libc_start_main.c b/src/env/__libc_start_main.c
index c5b277bd..ec732b10 100644
--- a/src/env/__libc_start_main.c
+++ b/src/env/__libc_start_main.c
@@ -22,7 +22,8 @@ __attribute__((__noinline__))
#endif
void __init_libc(char **envp, char *pn)
{
- size_t i, *auxv, aux[AUX_CNT] = { 0 };
+ size_t i = 0;
+ uintptr_t *auxv, aux[AUX_CNT] = { 0 };
__environ = envp;
for (i=0; envp[i]; i++);
libc.auxv = auxv = (void *)(envp+i+1);
diff --git a/src/include/sys/auxv.h b/src/include/sys/auxv.h
index 9358a4a5..a7fb201d 100644
--- a/src/include/sys/auxv.h
+++ b/src/include/sys/auxv.h
@@ -5,6 +5,6 @@
#include <features.h>
-hidden unsigned long __getauxval(unsigned long);
+hidden uintptr_t __getauxval(unsigned long);
#endif
diff --git a/src/internal/libc.h b/src/internal/libc.h
index 619bba86..0ee1b074 100644
--- a/src/internal/libc.h
+++ b/src/internal/libc.h
@@ -4,6 +4,7 @@
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
+#include <stdint.h>
struct __locale_map;
@@ -23,7 +24,7 @@ struct __libc {
char secure;
volatile signed char need_locks;
int threads_minus_1;
- size_t *auxv;
+ uintptr_t *auxv;
struct tls_module *tls_head;
size_t tls_size, tls_align, tls_cnt;
size_t page_size;
@@ -38,7 +39,7 @@ extern hidden struct __libc __libc;
#define libc __libc
hidden void __init_libc(char **, char *);
-hidden void __init_tls(size_t *);
+hidden void __init_tls(uintptr_t *);
hidden void __init_ssp(void *);
hidden void __libc_start_init(void);
hidden void __funcs_on_exit(void);
diff --git a/src/malloc/mallocng/glue.h b/src/malloc/mallocng/glue.h
index 151c48b8..fe158e4f 100644
--- a/src/malloc/mallocng/glue.h
+++ b/src/malloc/mallocng/glue.h
@@ -7,6 +7,7 @@
#include <unistd.h>
#include <elf.h>
#include <string.h>
+#include <sys/auxv.h>
#include "atomic.h"
#include "syscall.h"
#include "libc.h"
@@ -41,10 +42,9 @@
static inline uint64_t get_random_secret()
{
- uint64_t secret = (uintptr_t)&secret * 1103515245;
- for (size_t i=0; libc.auxv[i]; i+=2)
- if (libc.auxv[i]==AT_RANDOM)
- memcpy(&secret, (char *)libc.auxv[i+1]+8, sizeof secret);
+ uint64_t secret = (size_t)&secret * 1103515245;
+ uintptr_t random = getauxval(AT_RANDOM);
+ if (random) secret = *((uint64_t*)((char*)random + 8));
return secret;
}
diff --git a/src/misc/getauxval.c b/src/misc/getauxval.c
index 57f21eed..45df6e83 100644
--- a/src/misc/getauxval.c
+++ b/src/misc/getauxval.c
@@ -2,7 +2,7 @@
#include <errno.h>
#include "libc.h"
-unsigned long __getauxval(unsigned long item)
+uintptr_t __getauxval(unsigned long item)
{
size_t *auxv = libc.auxv;
if (item == AT_SECURE) return libc.secure;
--
2.24.3 (Apple Git-128)
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