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perf kmaps: Check kmaps to make code more robust

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This patch add checks in places where map__kmap is used to get kmaps
from struct kmap.

Error messages are added at map__kmap to warn invalid accessing of kmap
(for the case of !map->dso->kernel, kmap(map) does not exists at all).

Also, introduces map__kmaps() to warn uninitialized kmaps.

Reviewed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: pi3orama@163.com
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Link: http://lkml.kernel.org/r/1428394966-131044-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2015-04-07 08:22:45 +00:00 • committed by Arnaldo Carvalho de Melo
commit ba92732e98
7 changed files with 70 additions and 16 deletions
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5
tools/perf/util/machine.c
View file

@ -679,6 +679,9 @@ int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
machine->vmlinux_maps[type]->unmap_ip =
identity__map_ip;
kmap = map__kmap(machine->vmlinux_maps[type]);
if (!kmap)
return -1;
kmap->kmaps = &machine->kmaps;
map_groups__insert(&machine->kmaps,
machine->vmlinux_maps[type]);
@ -700,7 +703,7 @@ void machine__destroy_kernel_maps(struct machine *machine)
kmap = map__kmap(machine->vmlinux_maps[type]);
map_groups__remove(&machine->kmaps,
machine->vmlinux_maps[type]);
if (kmap->ref_reloc_sym) {
if (kmap && kmap->ref_reloc_sym) {
/*
* ref_reloc_sym is shared among all maps, so free just
* on one of them.

20
tools/perf/util/map.c
View file

@ -778,3 +778,23 @@ struct map *maps__next(struct map *map)
return rb_entry(next, struct map, rb_node);
return NULL;
}
struct kmap *map__kmap(struct map *map)
{
if (!map->dso || !map->dso->kernel) {
pr_err("Internal error: map__kmap with a non-kernel map\n");
return NULL;
}
return (struct kmap *)(map + 1);
}
struct map_groups *map__kmaps(struct map *map)
{
struct kmap *kmap = map__kmap(map);
if (!kmap || !kmap->kmaps) {
pr_err("Internal error: map__kmaps with a non-kernel map\n");
return NULL;
}
return kmap->kmaps;
}

6
tools/perf/util/map.h
View file

@ -76,10 +76,8 @@ static inline struct map_groups *map_groups__get(struct map_groups *mg)
void map_groups__put(struct map_groups *mg);
static inline struct kmap *map__kmap(struct map *map)
{
return (struct kmap *)(map + 1);
}
struct kmap *map__kmap(struct map *map);
struct map_groups *map__kmaps(struct map *map);
static inline u64 map__map_ip(struct map *map, u64 ip)
{

2
tools/perf/util/probe-event.c
View file

@ -135,6 +135,8 @@ static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
return NULL;
kmap = map__kmap(host_machine->vmlinux_maps[MAP__FUNCTION]);
if (!kmap)
return NULL;
return kmap->ref_reloc_sym;
}

3
tools/perf/util/session.c
View file

@ -1466,6 +1466,9 @@ int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
for (i = 0; i < MAP__NR_TYPES; ++i) {
struct kmap *kmap = map__kmap(maps[i]);
if (!kmap)
continue;
kmap->ref_reloc_sym = ref;
}

16
tools/perf/util/symbol-elf.c
View file

@ -776,6 +776,7 @@ int dso__load_sym(struct dso *dso, struct map *map,
symbol_filter_t filter, int kmodule)
{
struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
struct map_groups *kmaps = kmap ? map__kmaps(map) : NULL;
struct map *curr_map = map;
struct dso *curr_dso = dso;
Elf_Data *symstrs, *secstrs;
@ -791,6 +792,9 @@ int dso__load_sym(struct dso *dso, struct map *map,
int nr = 0;
bool remap_kernel = false, adjust_kernel_syms = false;
if (kmap && !kmaps)
return -1;
dso->symtab_type = syms_ss->type;
dso->is_64_bit = syms_ss->is_64_bit;
dso->rel = syms_ss->ehdr.e_type == ET_REL;
@ -958,8 +962,10 @@ int dso__load_sym(struct dso *dso, struct map *map,
map->map_ip = map__map_ip;
map->unmap_ip = map__unmap_ip;
/* Ensure maps are correctly ordered */
map_groups__remove(kmap->kmaps, map);
map_groups__insert(kmap->kmaps, map);
if (kmaps) {
map_groups__remove(kmaps, map);
map_groups__insert(kmaps, map);
}
}
/*
@ -983,7 +989,7 @@ int dso__load_sym(struct dso *dso, struct map *map,
snprintf(dso_name, sizeof(dso_name),
"%s%s", dso->short_name, section_name);
curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
curr_map = map_groups__find_by_name(kmaps, map->type, dso_name);
if (curr_map == NULL) {
u64 start = sym.st_value;
@ -1013,7 +1019,7 @@ int dso__load_sym(struct dso *dso, struct map *map,
curr_map->unmap_ip = identity__map_ip;
}
curr_dso->symtab_type = dso->symtab_type;
map_groups__insert(kmap->kmaps, curr_map);
map_groups__insert(kmaps, curr_map);
/*
* The new DSO should go to the kernel DSOS
*/
@ -1075,7 +1081,7 @@ new_symbol:
* We need to fixup this here too because we create new
* maps here, for things like vsyscall sections.
*/
__map_groups__fixup_end(kmap->kmaps, map->type);
__map_groups__fixup_end(kmaps, map->type);
}
}
err = nr;

34
tools/perf/util/symbol.c
View file

@ -630,13 +630,16 @@ static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
symbol_filter_t filter)
{
struct map_groups *kmaps = map__kmap(map)->kmaps;
struct map_groups *kmaps = map__kmaps(map);
struct map *curr_map;
struct symbol *pos;
int count = 0, moved = 0;
struct rb_root *root = &dso->symbols[map->type];
struct rb_node *next = rb_first(root);
if (!kmaps)
return -1;
while (next) {
char *module;
@ -682,8 +685,8 @@ static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
symbol_filter_t filter)
{
struct map_groups *kmaps = map__kmap(map)->kmaps;
struct machine *machine = kmaps->machine;
struct map_groups *kmaps = map__kmaps(map);
struct machine *machine;
struct map *curr_map = map;
struct symbol *pos;
int count = 0, moved = 0;
@ -691,6 +694,11 @@ static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
struct rb_node *next = rb_first(root);
int kernel_range = 0;
if (!kmaps)
return -1;
machine = kmaps->machine;
while (next) {
char *module;
@ -1025,9 +1033,12 @@ static bool filename_from_kallsyms_filename(char *filename,
static int validate_kcore_modules(const char *kallsyms_filename,
struct map *map)
{
struct map_groups *kmaps = map__kmap(map)->kmaps;
struct map_groups *kmaps = map__kmaps(map);
char modules_filename[PATH_MAX];
if (!kmaps)
return -EINVAL;
if (!filename_from_kallsyms_filename(modules_filename, "modules",
kallsyms_filename))
return -EINVAL;
@ -1043,6 +1054,9 @@ static int validate_kcore_addresses(const char *kallsyms_filename,
{
struct kmap *kmap = map__kmap(map);
if (!kmap)
return -EINVAL;
if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
u64 start;
@ -1081,8 +1095,8 @@ static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
static int dso__load_kcore(struct dso *dso, struct map *map,
const char *kallsyms_filename)
{
struct map_groups *kmaps = map__kmap(map)->kmaps;
struct machine *machine = kmaps->machine;
struct map_groups *kmaps = map__kmaps(map);
struct machine *machine;
struct kcore_mapfn_data md;
struct map *old_map, *new_map, *replacement_map = NULL;
bool is_64_bit;
@ -1090,6 +1104,11 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
char kcore_filename[PATH_MAX];
struct symbol *sym;
if (!kmaps)
return -EINVAL;
machine = kmaps->machine;
/* This function requires that the map is the kernel map */
if (map != machine->vmlinux_maps[map->type])
return -EINVAL;
@ -1202,6 +1221,9 @@ static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
struct kmap *kmap = map__kmap(map);
u64 addr;
if (!kmap)
return -1;
if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
return 0;