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authorRichard Henderson <richard.henderson@linaro.org>2021-02-12 10:48:49 -0800
committerPeter Maydell <peter.maydell@linaro.org>2021-02-16 13:02:29 +0000
commit09f679b62dffd437446307884597273618004b2c (patch)
tree8eed2e8e0d96050bc42e8caae0c41800f978d2d1 /linux-user
parent687ca797893ca1e8538592f19ac61e9eafd0b899 (diff)
linux-user: Fix types in uaccess.c
For copy_*_user, only 0 and -TARGET_EFAULT are returned; no need to involve abi_long. Use size_t for lengths. Use bool for the lock_user copy argument. Use ssize_t for target_strlen, because we can't overflow the host memory space. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20210212184902.1251044-19-richard.henderson@linaro.org [PMM: moved fix for ifdef error to previous commit] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'linux-user')
-rw-r--r--linux-user/qemu.h12
-rw-r--r--linux-user/uaccess.c45
2 files changed, 28 insertions, 29 deletions
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 971af97a2f..d25a5dafc0 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -7,8 +7,6 @@
#include "exec/cpu_ldst.h"
#undef DEBUG_REMAP
-#ifdef DEBUG_REMAP
-#endif /* DEBUG_REMAP */
#include "exec/user/abitypes.h"
@@ -629,8 +627,8 @@ static inline bool access_ok(CPUState *cpu, int type,
* buffers between the target and host. These internally perform
* locking/unlocking of the memory.
*/
-abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
-abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
+int copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
+int copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
/* Functions for accessing guest memory. The tget and tput functions
read/write single values, byteswapping as necessary. The lock_user function
@@ -640,13 +638,13 @@ abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
/* Lock an area of guest memory into the host. If copy is true then the
host area will have the same contents as the guest. */
-void *lock_user(int type, abi_ulong guest_addr, long len, int copy);
+void *lock_user(int type, abi_ulong guest_addr, size_t len, bool copy);
/* Unlock an area of guest memory. The first LEN bytes must be
flushed back to guest memory. host_ptr = NULL is explicitly
allowed and does nothing. */
#ifndef DEBUG_REMAP
-static inline void unlock_user(void *host_ptr, abi_ulong guest_addr, long len)
+static inline void unlock_user(void *host_ptr, abi_ulong guest_addr, size_t len)
{ }
#else
void unlock_user(void *host_ptr, abi_ulong guest_addr, long len);
@@ -654,7 +652,7 @@ void unlock_user(void *host_ptr, abi_ulong guest_addr, long len);
/* Return the length of a string in target memory or -TARGET_EFAULT if
access error. */
-abi_long target_strlen(abi_ulong gaddr);
+ssize_t target_strlen(abi_ulong gaddr);
/* Like lock_user but for null terminated strings. */
void *lock_user_string(abi_ulong guest_addr);
diff --git a/linux-user/uaccess.c b/linux-user/uaccess.c
index bba012ed15..76af6a92b1 100644
--- a/linux-user/uaccess.c
+++ b/linux-user/uaccess.c
@@ -4,7 +4,7 @@
#include "qemu.h"
-void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
+void *lock_user(int type, abi_ulong guest_addr, size_t len, bool copy)
{
if (!access_ok_untagged(type, guest_addr, len)) {
return NULL;
@@ -26,7 +26,7 @@ void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
}
#ifdef DEBUG_REMAP
-void unlock_user(void *host_ptr, abi_ulong guest_addr, long len);
+void unlock_user(void *host_ptr, abi_ulong guest_addr, size_t len);
{
if (!host_ptr) {
return;
@@ -34,7 +34,7 @@ void unlock_user(void *host_ptr, abi_ulong guest_addr, long len);
if (host_ptr == g2h_untagged(guest_addr)) {
return;
}
- if (len > 0) {
+ if (len != 0) {
memcpy(g2h_untagged(guest_addr), host_ptr, len);
}
g_free(host_ptr);
@@ -43,53 +43,53 @@ void unlock_user(void *host_ptr, abi_ulong guest_addr, long len);
void *lock_user_string(abi_ulong guest_addr)
{
- abi_long len = target_strlen(guest_addr);
+ ssize_t len = target_strlen(guest_addr);
if (len < 0) {
return NULL;
}
- return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
+ return lock_user(VERIFY_READ, guest_addr, (size_t)len + 1, 1);
}
/* copy_from_user() and copy_to_user() are usually used to copy data
* buffers between the target and host. These internally perform
* locking/unlocking of the memory.
*/
-abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len)
+int copy_from_user(void *hptr, abi_ulong gaddr, size_t len)
{
- abi_long ret = 0;
- void *ghptr;
+ int ret = 0;
+ void *ghptr = lock_user(VERIFY_READ, gaddr, len, 1);
- if ((ghptr = lock_user(VERIFY_READ, gaddr, len, 1))) {
+ if (ghptr) {
memcpy(hptr, ghptr, len);
unlock_user(ghptr, gaddr, 0);
- } else
+ } else {
ret = -TARGET_EFAULT;
-
+ }
return ret;
}
-
-abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len)
+int copy_to_user(abi_ulong gaddr, void *hptr, size_t len)
{
- abi_long ret = 0;
- void *ghptr;
+ int ret = 0;
+ void *ghptr = lock_user(VERIFY_WRITE, gaddr, len, 0);
- if ((ghptr = lock_user(VERIFY_WRITE, gaddr, len, 0))) {
+ if (ghptr) {
memcpy(ghptr, hptr, len);
unlock_user(ghptr, gaddr, len);
- } else
+ } else {
ret = -TARGET_EFAULT;
+ }
return ret;
}
/* Return the length of a string in target memory or -TARGET_EFAULT if
access error */
-abi_long target_strlen(abi_ulong guest_addr1)
+ssize_t target_strlen(abi_ulong guest_addr1)
{
uint8_t *ptr;
abi_ulong guest_addr;
- int max_len, len;
+ size_t max_len, len;
guest_addr = guest_addr1;
for(;;) {
@@ -101,11 +101,12 @@ abi_long target_strlen(abi_ulong guest_addr1)
unlock_user(ptr, guest_addr, 0);
guest_addr += len;
/* we don't allow wrapping or integer overflow */
- if (guest_addr == 0 ||
- (guest_addr - guest_addr1) > 0x7fffffff)
+ if (guest_addr == 0 || (guest_addr - guest_addr1) > 0x7fffffff) {
return -TARGET_EFAULT;
- if (len != max_len)
+ }
+ if (len != max_len) {
break;
+ }
}
return guest_addr - guest_addr1;
}