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Date: Fri, 3 Apr 2015 13:11:46 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: Wang Nan <wangnan0@...wei.com>
Cc: namhyung@...nel.org, jolsa@...nel.org, acme@...hat.com,
mingo@...nel.org, linux-kernel@...r.kernel.org, pi3orama@....com,
Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH] perf: kmaps: enforce usage of kmaps to protect futher
bugs.
On Fri, Apr 03, 2015 at 08:47:57AM +0000, Wang Nan wrote:
> This patch add checkings on every place where uses map__kmap and get
> kmaps from struct kmap. Error messages are added at map__kmap to warn
> invalud accessing of kmap (for the case of !map->dso->kernel, kmap(map)
> is not exists at all). Also, introduces map__kmaps() to warn
> uninitialized kmaps.
looks ok, CC-ing Adrian
thanks,
jirka
>
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> ---
> tools/perf/util/machine.c | 5 ++++-
> tools/perf/util/map.h | 15 +++++++++++++++
> tools/perf/util/probe-event.c | 2 ++
> tools/perf/util/session.c | 3 +++
> tools/perf/util/symbol-elf.c | 16 +++++++++++-----
> tools/perf/util/symbol.c | 34 ++++++++++++++++++++++++++++------
> 6 files changed, 63 insertions(+), 12 deletions(-)
>
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index e335330..9c7feec 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -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.
> diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
> index 0e42438..2ba83c8 100644
> --- a/tools/perf/util/map.h
> +++ b/tools/perf/util/map.h
> @@ -78,9 +78,24 @@ void map_groups__put(struct map_groups *mg);
>
> static inline 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);
> }
>
> +static inline struct map_groups *kmaps 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;
> +}
> +
> static inline u64 map__map_ip(struct map *map, u64 ip)
> {
> return ip - map->start + map->pgoff;
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 8feac07..4fd49f0 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -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;
> }
>
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index adf0740..7caedb4 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1456,6 +1456,9 @@ 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;
> }
>
> diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
> index 476268c..a7ab606 100644
> --- a/tools/perf/util/symbol-elf.c
> +++ b/tools/perf/util/symbol-elf.c
> @@ -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;
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index fddeb90..201f6c4c 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -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;
>
> --
> 1.8.3.4
>
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