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Add various utrace's for use with ktrace to the ELF runtime linker. To
activate the traces, set the LD_UTRACE (or LD_32_UTRACE) environment variable. This also includes code in kdump(8) to parse the traces. Reviewed by: kan, jdp MFC after: 2 weeks
This commit is contained in:
John Baldwin
parent
50928713c7
commit
1f4b63f824
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=165916
@ -40,6 +40,8 @@
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#include <sys/mount.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <sys/ktrace.h>
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#include <dlfcn.h>
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#include <err.h>
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@ -136,6 +138,7 @@ static int rtld_verify_versions(const Objlist *);
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static int rtld_verify_object_versions(Obj_Entry *);
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static void object_add_name(Obj_Entry *, const char *);
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static int object_match_name(const Obj_Entry *, const char *);
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static void ld_utrace_log(int, void *, void *, size_t, int, const char *);
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void r_debug_state(struct r_debug *, struct link_map *);
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@ -155,6 +158,7 @@ static char *ld_library_path; /* Environment variable for search path */
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static char *ld_preload; /* Environment variable for libraries to
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load first */
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static char *ld_tracing; /* Called from ldd to print libs */
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static char *ld_utrace; /* Use utrace() to log events. */
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static Obj_Entry *obj_list; /* Head of linked list of shared objects */
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static Obj_Entry **obj_tail; /* Link field of last object in list */
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static Obj_Entry *obj_main; /* The main program shared object */
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@ -230,6 +234,53 @@ int tls_max_index = 1; /* Largest module index allocated */
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(dlp)->num_alloc = obj_count, \
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(dlp)->num_used = 0)
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#define UTRACE_DLOPEN_START 1
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#define UTRACE_DLOPEN_STOP 2
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#define UTRACE_DLCLOSE_START 3
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#define UTRACE_DLCLOSE_STOP 4
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#define UTRACE_LOAD_OBJECT 5
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#define UTRACE_UNLOAD_OBJECT 6
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#define UTRACE_ADD_RUNDEP 7
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#define UTRACE_PRELOAD_FINISHED 8
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#define UTRACE_INIT_CALL 9
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#define UTRACE_FINI_CALL 10
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struct utrace_rtld {
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char sig[4]; /* 'RTLD' */
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int event;
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void *handle;
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void *mapbase; /* Used for 'parent' and 'init/fini' */
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size_t mapsize;
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int refcnt; /* Used for 'mode' */
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char name[MAXPATHLEN];
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};
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#define LD_UTRACE(e, h, mb, ms, r, n) do { \
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if (ld_utrace != NULL) \
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ld_utrace_log(e, h, mb, ms, r, n); \
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} while (0)
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static void
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ld_utrace_log(int event, void *handle, void *mapbase, size_t mapsize,
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int refcnt, const char *name)
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{
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struct utrace_rtld ut;
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ut.sig[0] = 'R';
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ut.sig[1] = 'T';
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ut.sig[2] = 'L';
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ut.sig[3] = 'D';
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ut.event = event;
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ut.handle = handle;
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ut.mapbase = mapbase;
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ut.mapsize = mapsize;
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ut.refcnt = refcnt;
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bzero(ut.name, sizeof(ut.name));
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if (name)
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strlcpy(ut.name, name, sizeof(ut.name));
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utrace(&ut, sizeof(ut));
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}
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/*
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* Main entry point for dynamic linking. The first argument is the
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* stack pointer. The stack is expected to be laid out as described
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@ -309,6 +360,7 @@ _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp)
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} else
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dangerous_ld_env = 0;
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ld_tracing = getenv(LD_ "TRACE_LOADED_OBJECTS");
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ld_utrace = getenv(LD_ "UTRACE");
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if (ld_debug != NULL && *ld_debug != '\0')
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debug = 1;
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@ -1236,6 +1288,7 @@ load_preload_objects(void)
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p += len;
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p += strspn(p, delim);
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}
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LD_UTRACE(UTRACE_PRELOAD_FINISHED, NULL, NULL, 0, 0, NULL);
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return 0;
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}
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@ -1340,6 +1393,8 @@ do_load_object(int fd, const char *name, char *path, struct stat *sbp)
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obj->mapbase + obj->mapsize - 1, obj->path);
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if (obj->textrel)
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dbg(" WARNING: %s has impure text", obj->path);
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LD_UTRACE(UTRACE_LOAD_OBJECT, obj, obj->mapbase, obj->mapsize, 0,
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obj->path);
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return obj;
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}
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@ -1378,6 +1433,8 @@ objlist_call_fini(Objlist *list)
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if (elm->obj->refcount == 0) {
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dbg("calling fini function for %s at %p", elm->obj->path,
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(void *)elm->obj->fini);
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LD_UTRACE(UTRACE_FINI_CALL, elm->obj, (void *)elm->obj->fini, 0, 0,
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elm->obj->path);
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call_initfini_pointer(elm->obj, elm->obj->fini);
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}
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}
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@ -1403,6 +1460,8 @@ objlist_call_init(Objlist *list)
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STAILQ_FOREACH(elm, list, link) {
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dbg("calling init function for %s at %p", elm->obj->path,
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(void *)elm->obj->init);
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LD_UTRACE(UTRACE_INIT_CALL, elm->obj, (void *)elm->obj->init, 0, 0,
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elm->obj->path);
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call_initfini_pointer(elm->obj, elm->obj->init);
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}
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errmsg_restore(saved_msg);
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@ -1676,6 +1735,8 @@ dlclose(void *handle)
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wlock_release(rtld_bind_lock, lockstate);
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return -1;
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}
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LD_UTRACE(UTRACE_DLCLOSE_START, handle, NULL, 0, root->dl_refcount,
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root->path);
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/* Unreference the object and its dependencies. */
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root->dl_refcount--;
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@ -1697,6 +1758,7 @@ dlclose(void *handle)
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unload_object(root);
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GDB_STATE(RT_CONSISTENT,NULL);
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}
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LD_UTRACE(UTRACE_DLCLOSE_STOP, handle, NULL, 0, 0, NULL);
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wlock_release(rtld_bind_lock, lockstate);
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return 0;
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}
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@ -1739,6 +1801,7 @@ dlopen(const char *name, int mode)
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Objlist initlist;
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int result, lockstate;
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LD_UTRACE(UTRACE_DLOPEN_START, NULL, NULL, 0, mode, name);
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ld_tracing = (mode & RTLD_TRACE) == 0 ? NULL : "1";
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if (ld_tracing != NULL)
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environ = (char **)*get_program_var_addr("environ");
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@ -1791,6 +1854,8 @@ dlopen(const char *name, int mode)
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}
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}
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LD_UTRACE(UTRACE_DLOPEN_STOP, obj, NULL, 0, obj ? obj->dl_refcount : 0,
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name);
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GDB_STATE(RT_CONSISTENT,obj ? &obj->linkmap : NULL);
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/* Call the init functions with no locks held. */
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@ -2655,6 +2720,8 @@ unload_object(Obj_Entry *root)
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linkp = &obj_list->next;
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while ((obj = *linkp) != NULL) {
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if (obj->refcount == 0) {
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LD_UTRACE(UTRACE_UNLOAD_OBJECT, obj, obj->mapbase, obj->mapsize, 0,
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obj->path);
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dbg("unloading \"%s\"", obj->path);
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munmap(obj->mapbase, obj->mapsize);
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linkmap_delete(obj);
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@ -59,6 +59,7 @@ extern int errno;
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#include <sys/ioctl.h>
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#include <sys/ptrace.h>
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#include <sys/socket.h>
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#include <dlfcn.h>
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#include <err.h>
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#include <locale.h>
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#include <stdio.h>
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@ -975,6 +976,107 @@ ktrcsw(struct ktr_csw *cs)
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cs->user ? "user" : "kernel");
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}
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#define UTRACE_DLOPEN_START 1
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#define UTRACE_DLOPEN_STOP 2
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#define UTRACE_DLCLOSE_START 3
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#define UTRACE_DLCLOSE_STOP 4
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#define UTRACE_LOAD_OBJECT 5
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#define UTRACE_UNLOAD_OBJECT 6
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#define UTRACE_ADD_RUNDEP 7
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#define UTRACE_PRELOAD_FINISHED 8
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#define UTRACE_INIT_CALL 9
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#define UTRACE_FINI_CALL 10
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struct utrace_rtld {
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char sig[4]; /* 'RTLD' */
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int event;
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void *handle;
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void *mapbase;
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size_t mapsize;
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int refcnt;
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char name[MAXPATHLEN];
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};
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void
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ktruser_rtld(int len, unsigned char *p)
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{
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struct utrace_rtld *ut = (struct utrace_rtld *)p;
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void *parent;
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int mode;
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switch (ut->event) {
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case UTRACE_DLOPEN_START:
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mode = ut->refcnt;
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printf("dlopen(%s, ", ut->name);
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switch (mode & RTLD_MODEMASK) {
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case RTLD_NOW:
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printf("RTLD_NOW");
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break;
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case RTLD_LAZY:
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printf("RTLD_LAZY");
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break;
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default:
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printf("%#x", mode & RTLD_MODEMASK);
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}
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if (mode & RTLD_GLOBAL)
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printf(" | RTLD_GLOBAL");
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if (mode & RTLD_TRACE)
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printf(" | RTLD_TRACE");
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if (mode & ~(RTLD_MODEMASK | RTLD_GLOBAL | RTLD_TRACE))
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printf(" | %#x", mode &
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~(RTLD_MODEMASK | RTLD_GLOBAL | RTLD_TRACE));
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printf(")\n");
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break;
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case UTRACE_DLOPEN_STOP:
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printf("%p = dlopen(%s) ref %d\n", ut->handle, ut->name,
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ut->refcnt);
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break;
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case UTRACE_DLCLOSE_START:
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printf("dlclose(%p) (%s, %d)\n", ut->handle, ut->name,
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ut->refcnt);
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break;
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case UTRACE_DLCLOSE_STOP:
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printf("dlclose(%p) finished\n", ut->handle);
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break;
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case UTRACE_LOAD_OBJECT:
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printf("RTLD: loaded %p @ %p - %p (%s)\n", ut->handle,
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ut->mapbase, (char *)ut->mapbase + ut->mapsize - 1,
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ut->name);
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break;
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case UTRACE_UNLOAD_OBJECT:
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printf("RTLD: unloaded %p @ %p - %p (%s)\n", ut->handle,
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ut->mapbase, (char *)ut->mapbase + ut->mapsize - 1,
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ut->name);
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break;
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case UTRACE_ADD_RUNDEP:
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parent = ut->mapbase;
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printf("RTLD: %p now depends on %p (%s, %d)\n", parent,
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ut->handle, ut->name, ut->refcnt);
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break;
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case UTRACE_PRELOAD_FINISHED:
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printf("RTLD: LD_PRELOAD finished\n");
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break;
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case UTRACE_INIT_CALL:
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printf("RTLD: init %p for %p (%s)\n", ut->mapbase, ut->handle,
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ut->name);
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break;
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case UTRACE_FINI_CALL:
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printf("RTLD: fini %p for %p (%s)\n", ut->mapbase, ut->handle,
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ut->name);
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break;
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default:
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p += 4;
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len -= 4;
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printf("RTLD: %d ", len);
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while (len--)
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if (decimal)
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printf(" %d", *p++);
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else
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printf(" %02x", *p++);
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printf("\n");
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}
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}
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struct utrace_malloc {
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void *p;
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size_t s;
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@ -1003,6 +1105,11 @@ void
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ktruser(int len, unsigned char *p)
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{
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if (len >= 8 && bcmp(p, "RTLD", 4) == 0) {
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ktruser_rtld(len, p);
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return;
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}
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if (len == sizeof(struct utrace_malloc)) {
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ktruser_malloc(len, p);
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return;
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