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tests/gutils-user-database: Fix test on macOS

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Use DYLD interposing on macOS
This commit is contained in:
Luca Bacci 2023-09-26 12:09:02 +02:00
parent 91b41f5234
commit 991cb9ef8c
2 changed files with 51 additions and 35 deletions
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76
glib/tests/getpwuid-preload.c
View File

@ -25,57 +25,67 @@
#include <sys/types.h>
#include <unistd.h>
#undef getpwuid
#ifndef __APPLE__
static struct passwd my_pw;
#define GET_REAL(func) \
(real_##func = dlsym (RTLD_NEXT, #func))
#define DEFINE_WRAPPER(return_type, func, argument_list) \
static return_type (* real_##func) argument_list; \
return_type func argument_list
#else
#define GET_REAL(func) \
func
/* https://opensource.apple.com/source/dyld/dyld-852.2/include/mach-o/dyld-interposing.h */
#define DYLD_INTERPOSE(_replacement,_replacee) \
__attribute__((used)) static struct{ const void* replacement; const void* replacee; } _interpose_##_replacee \
__attribute__ ((section ("__DATA,__interpose"))) = { (const void*)(unsigned long)&_replacement, (const void*)(unsigned long)&_replacee };
#define DEFINE_WRAPPER(return_type, func, argument_list) \
static return_type wrap_##func argument_list; \
DYLD_INTERPOSE(wrap_##func, func) \
static return_type wrap_##func argument_list
#endif /* __APPLE__ */
/* This is used in gutils.c used to make sure utility functions
* handling user information do not crash on bad data (for example
* caused by getpwuid returning some NULL elements.
*/
struct passwd *
getpwuid (uid_t uid)
#undef getpwuid
static struct passwd my_pw;
DEFINE_WRAPPER (struct passwd *, getpwuid, (uid_t uid))
{
static struct passwd *(*real_getpwuid) (uid_t);
struct passwd *pw;
if (real_getpwuid == NULL)
real_getpwuid = dlsym (RTLD_NEXT, "getpwuid");
pw = real_getpwuid (uid);
struct passwd *pw = GET_REAL (getpwuid) (uid);
my_pw = *pw;
my_pw.pw_name = NULL;
return &my_pw;
}
int
getpwnam_r (const char *name, struct passwd *pwd, char buf[], size_t buflen, struct passwd **result)
DEFINE_WRAPPER (int, getpwnam_r, (const char *name,
struct passwd *pwd,
char buf[],
size_t buflen,
struct passwd **result))
{
int code;
int (*real_getpwnam_r) (const char *,
struct passwd *,
char[],
size_t,
struct passwd **) = dlsym (RTLD_NEXT, "getpwnam_r");
code = real_getpwnam_r (name, pwd, buf, buflen, result);
int code = GET_REAL (getpwnam_r) (name, pwd, buf, buflen, result);
pwd->pw_name = NULL;
return code;
}
int
getpwuid_r (uid_t uid, struct passwd *restrict pwd, char buf[], size_t buflen, struct passwd **result)
DEFINE_WRAPPER (int, getpwuid_r, (uid_t uid,
struct passwd *restrict pwd,
char buf[],
size_t buflen,
struct passwd **result))
{
int code;
int (*real_getpwuid_r) (uid_t,
struct passwd *,
char[],
size_t,
struct passwd **) = dlsym (RTLD_NEXT, "getpwuid_r");
code = real_getpwuid_r (uid, pwd, buf, buflen, result);
int code = GET_REAL (getpwuid_r) (uid, pwd, buf, buflen, result);
pwd->pw_name = NULL;
return code;
}

10
glib/tests/meson.build
View File

@ -234,14 +234,20 @@ else
install_tag : 'tests',
install: installed_tests_enabled)
if host_system not in ['ios', 'darwin']
var_preload = 'LD_PRELOAD'
else
var_preload = 'DYLD_INSERT_LIBRARIES'
endif
glib_tests += {
'gutils-user-database' : {
'depends' : [],
'env' : {
'LD_PRELOAD': getpwuid_preload.full_path()
var_preload: getpwuid_preload.full_path()
},
'installed_tests_env' : {
'LD_PRELOAD': installed_tests_execdir / fs.name(getpwuid_preload.full_path())
var_preload: installed_tests_execdir / fs.name(getpwuid_preload.full_path())
},
},
}