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i386: Fix GCC warning with snprintf when HAX is enabled 

When HAX is enabled (--enable-hax), GCC 9.2.1 reports issues with
snprintf(). Replacing old snprintf() by g_strdup_printf() fixes the
problem with boundary checks of vm_id and vcpu_id and finally the
warnings produced by GCC.

For more details, one example of warning:
  CC      i386-softmmu/target/i386/hax-posix.o
qemu/target/i386/hax-posix.c: In function ‘hax_host_open_vm’:
qemu/target/i386/hax-posix.c:124:56: error: ‘%02d’ directive output may be
truncated writing between 2 and 11 bytes into a region of size 3
[-Werror=format-truncation=]
  124 |     snprintf(name, sizeof HAX_VM_DEVFS, "/dev/hax_vm/vm%02d", vm_id);
      |                                                        ^~~~
qemu/target/i386/hax-posix.c:124:41: note: directive argument in the range
[-2147483648, 64]
  124 |     snprintf(name, sizeof HAX_VM_DEVFS, "/dev/hax_vm/vm%02d", vm_id);
      |                                         ^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/stdio.h:867,
                 from qemu/include/qemu/osdep.h:99,
                 from qemu/target/i386/hax-posix.c:14:
/usr/include/bits/stdio2.h:67:10: note: ‘__builtin___snprintf_chk’ output
between 17 and 26 bytes into a destination of size 17
   67 |   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   68 |        __bos (__s), __fmt, __va_arg_pack ());
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Julio Faracco 2020-03-02 17:13:20 -03:00 committed by Paolo Bonzini
parent 64a7b8de42
commit acb9f95a7c
2 changed files with 4 additions and 62 deletions
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33
target/i386/hax-posix.c
View File

@ -108,41 +108,12 @@ int hax_mod_version(struct hax_state *hax, struct hax_module_version *version)
static char *hax_vm_devfs_string(int vm_id)
{
char *name;
if (vm_id > MAX_VM_ID) {
fprintf(stderr, "Too big VM id\n");
return NULL;
}
#define HAX_VM_DEVFS "/dev/hax_vm/vmxx"
name = g_strdup(HAX_VM_DEVFS);
if (!name) {
return NULL;
}
snprintf(name, sizeof HAX_VM_DEVFS, "/dev/hax_vm/vm%02d", vm_id);
return name;
return g_strdup_printf("/dev/hax_vm/vm%02d", vm_id);
}
static char *hax_vcpu_devfs_string(int vm_id, int vcpu_id)
{
char *name;
if (vm_id > MAX_VM_ID || vcpu_id > MAX_VCPU_ID) {
fprintf(stderr, "Too big vm id %x or vcpu id %x\n", vm_id, vcpu_id);
return NULL;
}
#define HAX_VCPU_DEVFS "/dev/hax_vmxx/vcpuxx"
name = g_strdup(HAX_VCPU_DEVFS);
if (!name) {
return NULL;
}
snprintf(name, sizeof HAX_VCPU_DEVFS, "/dev/hax_vm%02d/vcpu%02d",
vm_id, vcpu_id);
return name;
return g_strdup_printf("/dev/hax_vm%02d/vcpu%02d", vm_id, vcpu_id);
}
int hax_host_create_vm(struct hax_state *hax, int *vmid)

33
target/i386/hax-windows.c
View File

@ -185,41 +185,12 @@ int hax_mod_version(struct hax_state *hax, struct hax_module_version *version)
static char *hax_vm_devfs_string(int vm_id)
{
char *name;
if (vm_id > MAX_VM_ID) {
fprintf(stderr, "Too big VM id\n");
return NULL;
}
#define HAX_VM_DEVFS "\\\\.\\hax_vmxx"
name = g_strdup(HAX_VM_DEVFS);
if (!name) {
return NULL;
}
snprintf(name, sizeof HAX_VM_DEVFS, "\\\\.\\hax_vm%02d", vm_id);
return name;
return g_strdup_printf("/dev/hax_vm/vm%02d", vm_id);
}
static char *hax_vcpu_devfs_string(int vm_id, int vcpu_id)
{
char *name;
if (vm_id > MAX_VM_ID || vcpu_id > MAX_VCPU_ID) {
fprintf(stderr, "Too big vm id %x or vcpu id %x\n", vm_id, vcpu_id);
return NULL;
}
#define HAX_VCPU_DEVFS "\\\\.\\hax_vmxx_vcpuxx"
name = g_strdup(HAX_VCPU_DEVFS);
if (!name) {
return NULL;
}
snprintf(name, sizeof HAX_VCPU_DEVFS, "\\\\.\\hax_vm%02d_vcpu%02d",
vm_id, vcpu_id);
return name;
return g_strdup_printf("/dev/hax_vm%02d/vcpu%02d", vm_id, vcpu_id);
}
int hax_host_create_vm(struct hax_state *hax, int *vmid)