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Add an aslr option for perf inject that remaps all virtual addresses, or drops data/events, so that the virtual address information isn't leaked. This patch introduces the core ASLR remapping tool infrastructure and implements remapping/tracking for metadata events (MMAP, MMAP2, COMM, FORK, EXIT, KSYMBOL, TEXT_POKE). Sample events are delegated without remapping for now. Assisted-by: Antigravity:gemini-3.5-flash Signed-off-by: Ian Rogers Co-developed-by: Gabriel Marin Signed-off-by: Gabriel Marin --- tools/perf/builtin-inject.c | 57 ++- tools/perf/util/Build | 1 + tools/perf/util/aslr.c | 689 ++++++++++++++++++++++++++++++++++++ tools/perf/util/aslr.h | 37 ++ 4 files changed, 782 insertions(+), 2 deletions(-) create mode 100644 tools/perf/util/aslr.c create mode 100644 tools/perf/util/aslr.h diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c index 75ffe31d03fe..65c7eccccf4d 100644 --- a/tools/perf/builtin-inject.c +++ b/tools/perf/builtin-inject.c @@ -8,6 +8,7 @@ */ #include "builtin.h" +#include "util/aslr.h" #include "util/color.h" #include "util/dso.h" #include "util/vdso.h" @@ -124,6 +125,7 @@ struct perf_inject { bool in_place_update_dry_run; bool copy_kcore_dir; bool convert_callchain; + bool aslr; const char *input_name; struct perf_data output; u64 bytes_written; @@ -242,8 +244,25 @@ static int perf_event__repipe_attr(const struct perf_tool *tool, if (!inject->output.is_pipe) return 0; - if (!inject->itrace_synth_opts.set) + if (!inject->itrace_synth_opts.set) { + if (inject->aslr) { + union perf_event *stripped_event = malloc(event->header.size); + int err; + + if (!stripped_event) + return -ENOMEM; + memcpy(stripped_event, event, event->header.size); + stripped_event->attr.attr.sample_type &= ASLR_SUPPORTED_SAMPLE_TYPE; + + if (stripped_event->attr.attr.type == PERF_TYPE_BREAKPOINT) + stripped_event->attr.attr.bp_addr = 0; + + err = perf_event__repipe_synth(tool, stripped_event); + free(stripped_event); + return err; + } return perf_event__repipe_synth(tool, event); + } if (event->header.size < sizeof(struct perf_event_header) + PERF_ATTR_SIZE_VER0) { pr_err("Attribute event size %u is too small\n", event->header.size); @@ -276,6 +295,8 @@ static int perf_event__repipe_attr(const struct perf_tool *tool, attr.size = sizeof(struct perf_event_attr); attr.sample_type &= ~PERF_SAMPLE_AUX; + if (inject->aslr) + attr.sample_type &= ASLR_SUPPORTED_SAMPLE_TYPE; if (inject->itrace_synth_opts.add_last_branch) { attr.sample_type |= PERF_SAMPLE_BRANCH_STACK; @@ -2595,6 +2616,8 @@ static int __cmd_inject(struct perf_inject *inject) } } + + session->header.data_offset = output_data_offset; session->header.data_size = inject->bytes_written; perf_session__inject_header(session, session->evlist, fd, &inj_fc.fc, @@ -2704,6 +2727,8 @@ int cmd_inject(int argc, const char **argv) unwind__option), OPT_BOOLEAN(0, "convert-callchain", &inject.convert_callchain, "Generate callchains using DWARF and drop register/stack data"), + OPT_BOOLEAN(0, "aslr", &inject.aslr, + "Remap virtual memory addresses similar to ASLR"), OPT_END() }; const char * const inject_usage[] = { @@ -2711,6 +2736,7 @@ int cmd_inject(int argc, const char **argv) NULL }; bool ordered_events; + struct perf_tool *tool = &inject.tool; if (!inject.itrace_synth_opts.set) { /* Disable eager loading of kernel symbols that adds overhead to perf inject. */ @@ -2731,6 +2757,11 @@ int cmd_inject(int argc, const char **argv) if (argc) usage_with_options(inject_usage, options); + if (inject.aslr && inject.convert_callchain) { + pr_err("Error: --aslr and --convert-callchain are mutually exclusive features.\n"); + return -EINVAL; + } + if (inject.strip && !inject.itrace_synth_opts.set) { pr_err("--strip option requires --itrace option\n"); return -1; @@ -2824,12 +2855,21 @@ int cmd_inject(int argc, const char **argv) inject.tool.schedstat_domain = perf_event__repipe_op2_synth; inject.tool.dont_split_sample_group = true; inject.tool.merge_deferred_callchains = false; - inject.session = __perf_session__new(&data, &inject.tool, + if (inject.aslr) { + tool = aslr_tool__new(&inject.tool); + if (!tool) { + ret = -ENOMEM; + goto out_close_output; + } + } + inject.session = __perf_session__new(&data, tool, /*trace_event_repipe=*/inject.output.is_pipe, /*host_env=*/NULL); if (IS_ERR(inject.session)) { ret = PTR_ERR(inject.session); + if (inject.aslr) + aslr_tool__delete(tool); goto out_close_output; } @@ -2923,12 +2963,25 @@ int cmd_inject(int argc, const char **argv) ret = __cmd_inject(&inject); + if (inject.aslr) { + struct evsel *evsel; + + evlist__for_each_entry(inject.session->evlist, evsel) { + evsel->core.attr.sample_type &= ASLR_SUPPORTED_SAMPLE_TYPE; + + if (evsel->core.attr.type == PERF_TYPE_BREAKPOINT) + evsel->core.attr.bp_addr = 0; + } + } + guest_session__exit(&inject.guest_session); out_delete: strlist__delete(inject.known_build_ids); zstd_fini(&(inject.session->zstd_data)); perf_session__delete(inject.session); + if (inject.aslr) + aslr_tool__delete(tool); out_close_output: if (!inject.in_place_update) perf_data__close(&inject.output); diff --git a/tools/perf/util/Build b/tools/perf/util/Build index 4bbc78b1f741..19994e026ae5 100644 --- a/tools/perf/util/Build +++ b/tools/perf/util/Build @@ -6,6 +6,7 @@ perf-util-y += arm64-frame-pointer-unwind-support.o perf-util-y += addr2line.o perf-util-y += addr_location.o perf-util-y += annotate.o +perf-util-y += aslr.o perf-util-y += blake2s.o perf-util-y += block-info.o perf-util-y += block-range.o diff --git a/tools/perf/util/aslr.c b/tools/perf/util/aslr.c new file mode 100644 index 000000000000..ac24fda658a5 --- /dev/null +++ b/tools/perf/util/aslr.c @@ -0,0 +1,689 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "aslr.h" + +#include "addr_location.h" +#include "debug.h" +#include "event.h" +#include "evsel.h" +#include "machine.h" +#include "map.h" +#include "thread.h" +#include "tool.h" +#include "session.h" +#include "data.h" +#include "dso.h" + +#include /* page_size */ +#include +#include +#include +#include + +/** + * struct remap_addresses_key - Key for mapping original addresses to remapped ones. + * @dso: Pointer to the DSO (Dynamic Shared Object) associated with the mapping. + * @invariant: Unique offset invariant within the VMA (Virtual Memory Area). + * Calculated as `start - pgoff`. This value remains constant when + * perf's internal `maps__fixup_overlap_and_insert` splits a map into + * fragmented VMA pieces due to overlapping events, allowing us to + * resolve split maps consistently back to the original VMA. + * @pid: Process ID associated with the mapping. + */ +struct remap_addresses_key { + struct machine *machine; + struct dso *dso; + u64 invariant; + pid_t pid; +}; + +struct aslr_mapping { + struct list_head node; + u64 orig_start; + u64 len; + u64 remap_start; +}; + +struct process_top_address { + u64 remapped_max; + u64 orig_last_end; +}; +struct aslr_tool { + /** @tool: The tool implemented here and a pointer to a delegate to process the data. */ + struct delegate_tool tool; + /** @machines: The machines with the input, not remapped, virtual address layout. */ + struct machines machines; + /** @event_copy: Buffer used to create an event to pass to the delegate. */ + char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8); + /** @remap_addresses: mapping from remap_addresses_key to remapped address. */ + struct hashmap remap_addresses; + /** @top_addresses: mapping from process to max remapped address. */ + struct hashmap top_addresses; +}; + +static const pid_t kernel_pid = -1; + +/* Start remapping user processes from a small non-zero offset. */ +static const u64 user_space_start = 0x200000; +static const u64 kernel_space_start = 0xffff800010000000; + +static size_t remap_addresses__hash(long _key, void *ctx __maybe_unused) +{ + struct remap_addresses_key *key = (struct remap_addresses_key *)_key; + + return (size_t)key->machine ^ (size_t)RC_CHK_ACCESS(key->dso) ^ key->invariant ^ key->pid; +} + +static bool remap_addresses__equal(long _key1, long _key2, void *ctx __maybe_unused) +{ + struct remap_addresses_key *key1 = (struct remap_addresses_key *)_key1; + struct remap_addresses_key *key2 = (struct remap_addresses_key *)_key2; + + return key1->machine == key2->machine && + RC_CHK_EQUAL(key1->dso, key2->dso) && + key1->invariant == key2->invariant && + key1->pid == key2->pid; +} + +struct top_addresses_key { + struct machine *machine; + pid_t pid; +}; + +static size_t top_addresses__hash(long _key, void *ctx __maybe_unused) +{ + struct top_addresses_key *key = (struct top_addresses_key *)_key; + + return (size_t)key->machine ^ key->pid; +} + +static bool top_addresses__equal(long _key1, long _key2, void *ctx __maybe_unused) +{ + struct top_addresses_key *key1 = (struct top_addresses_key *)_key1; + struct top_addresses_key *key2 = (struct top_addresses_key *)_key2; + + return key1->machine == key2->machine && key1->pid == key2->pid; +} + +static u64 round_up_to_page_size(u64 addr) +{ + return (addr + page_size - 1) & ~((u64)page_size - 1); +} + +struct aslr_machine_priv { + bool kernel_maps_loaded; +}; + +static int aslr_tool__preload_kernel_maps(struct machine *machine) +{ + struct aslr_machine_priv *mpriv = machine->priv; + + if (!mpriv) { + mpriv = zalloc(sizeof(*mpriv)); + if (!mpriv) + return -ENOMEM; + machine->priv = mpriv; + } + + if (!mpriv->kernel_maps_loaded) { + struct maps *kmaps = machine__kernel_maps(machine); + + if (kmaps) { + int err = maps__load_maps(kmaps); + + if (err < 0) { + pr_err("ASLR: Failed to preload kernel maps for machine pid %d\n", + machine->pid); + return err; + } + } + mpriv->kernel_maps_loaded = true; + } + return 0; +} + +static void aslr_tool__free_machine_priv(struct machine *machine) +{ + free(machine->priv); + machine->priv = NULL; +} + +static void aslr_tool__destroy_machines_priv(struct machines *machines) +{ + struct rb_node *nd; + + aslr_tool__free_machine_priv(&machines->host); + for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) { + struct machine *machine = rb_entry(nd, struct machine, rb_node); + + aslr_tool__free_machine_priv(machine); + } +} + +static u64 aslr_tool__findnew_mapping(struct aslr_tool *aslr, + struct thread *aslr_thread, + u8 cpumode, u64 start, + u64 len, u64 pgoff) +{ + /* Address location for dso lookup. */ + struct addr_location al; + /* Original ASLR address based key for the remap table. */ + struct remap_addresses_key remap_key; + /* The address in the ASLR sanitized address space less pg_off. */ + u64 *remapped_invariant_ptr; + /* Key for the maximum address in a process. */ + struct top_addresses_key top_addr_key; + /* Value in top address table. */ + struct process_top_address *top = NULL; + /* Address in ASLR sanitized address space. */ + u64 remap_addr; + /* Potentially allocated remap table key. */ + struct remap_addresses_key *new_remap_key = NULL; + /* + * Potentially allocated remap table key. + * TODO: Avoid allocation necessary for perf 32-bit binary support. + */ + u64 *new_remap_val = NULL; + int err; + + if (!aslr_thread) + return 0; + + /* The key to look up an incoming address to the outgoing value. */ + addr_location__init(&al); + remap_key.machine = maps__machine(thread__maps(aslr_thread)); + remap_key.pid = (cpumode == PERF_RECORD_MISC_KERNEL || + cpumode == PERF_RECORD_MISC_GUEST_KERNEL) ? + kernel_pid : thread__pid(aslr_thread); + if (thread__find_map(aslr_thread, cpumode, start, &al)) { + struct dso *dso = map__dso(al.map); + const char *dso_name = dso ? dso__long_name(dso) : NULL; + + remap_key.dso = dso; + if (dso && !is_anon_memory(dso_name) && !is_no_dso_memory(dso_name)) + remap_key.invariant = map__start(al.map) - map__pgoff(al.map); + else + remap_key.invariant = map__start(al.map); + } else { + remap_key.dso = NULL; + remap_key.invariant = start; + } + + /* The key to look up top allocated address. */ + top_addr_key.machine = remap_key.machine; + top_addr_key.pid = remap_key.pid; + + if (hashmap__find(&aslr->remap_addresses, &remap_key, &remapped_invariant_ptr)) { + /* Mmap already exists. */ + u64 calculated_max; + + if (al.map) { + remap_addr = *remapped_invariant_ptr + map__pgoff(al.map) + + (start - map__start(al.map)); + } else { + remap_addr = *remapped_invariant_ptr + pgoff; + } + + calculated_max = remap_addr + len; + + /* See if top mapping was expanded. */ + if (hashmap__find(&aslr->top_addresses, &top_addr_key, &top)) { + if (calculated_max > top->remapped_max) + top->remapped_max = calculated_max; + } + addr_location__exit(&al); + return remap_addr; + } + /* No mmap, create an entry from the top address. */ + if (hashmap__find(&aslr->top_addresses, &top_addr_key, &top)) { + /* Current max allocated mmap address within the process. */ + remap_addr = top->remapped_max; + + if (start == top->orig_last_end) { + /* Contiguous mapping, do not add 1 page gap! */ + remap_addr = round_up_to_page_size(remap_addr); + } else { + /* Give 1 page gap from current max page. */ + remap_addr = round_up_to_page_size(remap_addr); + remap_addr += page_size; + } + top->orig_last_end = start + len; + if (remap_addr + len > top->remapped_max) + top->remapped_max = remap_addr + len; + } else { + /* First address of the process, allocate key and first top address. */ + struct top_addresses_key *tk; + struct process_top_address *top_val; + + remap_addr = (cpumode == PERF_RECORD_MISC_KERNEL || + cpumode == PERF_RECORD_MISC_GUEST_KERNEL) ? + kernel_space_start : user_space_start; + remap_addr = round_up_to_page_size(remap_addr); + + tk = malloc(sizeof(*tk)); + top_val = malloc(sizeof(*top_val)); + if (!tk || !top_val) { + err = -ENOMEM; + } else { + *tk = top_addr_key; + top_val->remapped_max = remap_addr + len; + top_val->orig_last_end = start + len; + err = hashmap__insert(&aslr->top_addresses, tk, top_val, + HASHMAP_ADD, NULL, NULL); + } + if (err) { + errno = -err; + pr_err("Failure to add ASLR process top address %m\n"); + free(tk); + free(top_val); + addr_location__exit(&al); + return 0; + } + } + /* Create rmeapping entry. */ + new_remap_key = malloc(sizeof(*new_remap_key)); + new_remap_val = malloc(sizeof(u64)); + if (!new_remap_key || !new_remap_val) { + err = -ENOMEM; + } else { + *new_remap_key = remap_key; + new_remap_key->dso = dso__get(remap_key.dso); + if (cpumode == PERF_RECORD_MISC_KERNEL || + cpumode == PERF_RECORD_MISC_GUEST_KERNEL) { + if (al.map) { + *new_remap_val = remap_addr - + (start - map__start(al.map)) - + map__pgoff(al.map); + } else { + *new_remap_val = remap_addr; + } + } else { + *new_remap_val = remap_addr - (al.map ? map__pgoff(al.map) : pgoff); + } + err = hashmap__add(&aslr->remap_addresses, new_remap_key, new_remap_val); + if (err) + dso__put(new_remap_key->dso); + } + if (err) { + errno = -err; + pr_err("Failure to add ASLR remapping %m\n"); + free(new_remap_key); + free(new_remap_val); + addr_location__exit(&al); + return 0; + } + addr_location__exit(&al); + return remap_addr; +} + +static int aslr_tool__process_mmap(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct delegate_tool *del_tool; + struct aslr_tool *aslr; + struct perf_tool *delegate; + union perf_event *new_event; + u8 cpumode; + struct thread *thread; + struct machine *aslr_machine; + int err; + + del_tool = container_of(tool, struct delegate_tool, tool); + aslr = container_of(del_tool, struct aslr_tool, tool); + delegate = aslr->tool.delegate; + new_event = (union perf_event *)aslr->event_copy; + cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; + + aslr_machine = machines__findnew(&aslr->machines, machine->pid); + if (!aslr_machine) + return -ENOMEM; + if (aslr_tool__preload_kernel_maps(aslr_machine) < 0) + return -ENOMEM; + + /* Create the thread, map, etc. in the ASLR before virtual address space. */ + err = perf_event__process_mmap(tool, event, sample, aslr_machine); + if (err) + return err; + + thread = machine__findnew_thread(aslr_machine, event->mmap.pid, event->mmap.tid); + if (!thread) + return -ENOMEM; + memcpy(&new_event->mmap, &event->mmap, event->mmap.header.size); + /* Remaps the mmap.start. */ + new_event->mmap.start = aslr_tool__findnew_mapping(aslr, thread, cpumode, + event->mmap.start, + event->mmap.len, + event->mmap.pgoff); + if (cpumode == PERF_RECORD_MISC_KERNEL || cpumode == PERF_RECORD_MISC_GUEST_KERNEL) + new_event->mmap.pgoff = new_event->mmap.start; + err = delegate->mmap(delegate, new_event, sample, machine); + thread__put(thread); + return err; +} + +static int aslr_tool__process_mmap2(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct delegate_tool *del_tool; + struct aslr_tool *aslr; + struct perf_tool *delegate; + union perf_event *new_event; + u8 cpumode; + struct thread *thread; + struct machine *aslr_machine; + int err; + + del_tool = container_of(tool, struct delegate_tool, tool); + aslr = container_of(del_tool, struct aslr_tool, tool); + delegate = aslr->tool.delegate; + new_event = (union perf_event *)aslr->event_copy; + cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; + + aslr_machine = machines__findnew(&aslr->machines, machine->pid); + if (!aslr_machine) + return -ENOMEM; + if (aslr_tool__preload_kernel_maps(aslr_machine) < 0) + return -ENOMEM; + + /* Create the thread, map, etc. in the ASLR before virtual address space. */ + err = perf_event__process_mmap2(tool, event, sample, aslr_machine); + if (err) + return err; + + thread = machine__findnew_thread(aslr_machine, event->mmap2.pid, event->mmap2.tid); + if (!thread) + return -ENOMEM; + memcpy(&new_event->mmap2, &event->mmap2, event->mmap2.header.size); + /* Remaps the mmap.start. */ + new_event->mmap2.start = aslr_tool__findnew_mapping(aslr, thread, cpumode, + event->mmap2.start, + event->mmap2.len, + event->mmap2.pgoff); + if (cpumode == PERF_RECORD_MISC_KERNEL || cpumode == PERF_RECORD_MISC_GUEST_KERNEL) + new_event->mmap2.pgoff = new_event->mmap2.start; + err = delegate->mmap2(delegate, new_event, sample, machine); + thread__put(thread); + return err; +} + +static int aslr_tool__process_comm(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct delegate_tool *del_tool; + struct aslr_tool *aslr; + struct perf_tool *delegate; + struct machine *aslr_machine; + int err; + + del_tool = container_of(tool, struct delegate_tool, tool); + aslr = container_of(del_tool, struct aslr_tool, tool); + delegate = aslr->tool.delegate; + + aslr_machine = machines__findnew(&aslr->machines, machine->pid); + if (!aslr_machine) + return -ENOMEM; + if (aslr_tool__preload_kernel_maps(aslr_machine) < 0) + return -ENOMEM; + + /* Create the thread, map, etc. in the ASLR before virtual address space. */ + err = perf_event__process_comm(tool, event, sample, aslr_machine); + if (err) + return err; + + return delegate->comm(delegate, event, sample, machine); +} + +static int aslr_tool__process_fork(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct delegate_tool *del_tool; + struct aslr_tool *aslr; + struct perf_tool *delegate; + struct machine *aslr_machine; + int err; + + del_tool = container_of(tool, struct delegate_tool, tool); + aslr = container_of(del_tool, struct aslr_tool, tool); + delegate = aslr->tool.delegate; + + aslr_machine = machines__findnew(&aslr->machines, machine->pid); + if (!aslr_machine) + return -ENOMEM; + if (aslr_tool__preload_kernel_maps(aslr_machine) < 0) + return -ENOMEM; + + /* Create the thread, map, etc. in the ASLR before virtual address space. */ + err = perf_event__process_fork(tool, event, sample, aslr_machine); + if (err) + return err; + + return delegate->fork(delegate, event, sample, machine); +} + +static int aslr_tool__process_exit(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct delegate_tool *del_tool; + struct aslr_tool *aslr; + struct perf_tool *delegate; + struct machine *aslr_machine; + int err; + + del_tool = container_of(tool, struct delegate_tool, tool); + aslr = container_of(del_tool, struct aslr_tool, tool); + delegate = aslr->tool.delegate; + + aslr_machine = machines__findnew(&aslr->machines, machine->pid); + if (!aslr_machine) + return -ENOMEM; + if (aslr_tool__preload_kernel_maps(aslr_machine) < 0) + return -ENOMEM; + + /* Create the thread, map, etc. in the ASLR before virtual address space. */ + err = perf_event__process_exit(tool, event, sample, aslr_machine); + if (err) + return err; + + return delegate->exit(delegate, event, sample, machine); +} + +static int aslr_tool__process_text_poke(const struct perf_tool *tool __maybe_unused, + union perf_event *event __maybe_unused, + struct perf_sample *sample __maybe_unused, + struct machine *machine __maybe_unused) +{ + /* Drop in case the instruction encodes an ASLR revealing address. */ + return 0; +} + +static int aslr_tool__process_ksymbol(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct delegate_tool *del_tool; + struct aslr_tool *aslr; + struct perf_tool *delegate; + union perf_event *new_event; + struct thread *thread; + struct machine *aslr_machine; + int err; + + del_tool = container_of(tool, struct delegate_tool, tool); + aslr = container_of(del_tool, struct aslr_tool, tool); + delegate = aslr->tool.delegate; + new_event = (union perf_event *)aslr->event_copy; + + aslr_machine = machines__findnew(&aslr->machines, machine->pid); + if (!aslr_machine) + return -ENOMEM; + if (aslr_tool__preload_kernel_maps(aslr_machine) < 0) + return -ENOMEM; + + err = perf_event__process_ksymbol(tool, event, sample, aslr_machine); + if (err) + return err; + + thread = machine__findnew_thread(aslr_machine, kernel_pid, 0); + if (!thread) + return -ENOMEM; + memcpy(&new_event->ksymbol, &event->ksymbol, event->ksymbol.header.size); + /* Remaps the ksymbol.start */ + new_event->ksymbol.addr = aslr_tool__findnew_mapping(aslr, thread, + PERF_RECORD_MISC_KERNEL, + event->ksymbol.addr, + event->ksymbol.len, + /*pgoff=*/0); + + err = delegate->ksymbol(delegate, new_event, sample, machine); + thread__put(thread); + return err; +} + +static int aslr_tool__process_sample(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct delegate_tool *del_tool = container_of(tool, struct delegate_tool, tool); + struct aslr_tool *aslr = container_of(del_tool, struct aslr_tool, tool); + struct perf_tool *delegate = aslr->tool.delegate; + + return delegate->sample(delegate, event, sample, machine); +} + +static int skipn(int fd, off_t n) +{ + char buf[4096]; + ssize_t ret; + + while (n > 0) { + ret = read(fd, buf, min_t(off_t, n, (off_t)sizeof(buf))); + if (ret <= 0) + return ret; + n -= ret; + } + + return 0; +} + +static s64 aslr_tool__process_auxtrace(const struct perf_tool *tool __maybe_unused, + struct perf_session *session, + union perf_event *event) +{ + pr_warning_once("ASLR: Dropping auxtrace data as it cannot be obfuscated.\n"); + if (perf_data__is_pipe(session->data)) { + /* Copy behavior of the stub by reading all pipe data. */ + int err = skipn(perf_data__fd(session->data), event->auxtrace.size); + + if (err < 0) + return err; + } + return event->auxtrace.size; +} + +static int aslr_tool__process_auxtrace_info(const struct perf_tool *tool __maybe_unused, + struct perf_session *session __maybe_unused, + union perf_event *event __maybe_unused) +{ + return 0; +} + +static int aslr_tool__process_auxtrace_error(const struct perf_tool *tool __maybe_unused, + struct perf_session *session __maybe_unused, + union perf_event *event __maybe_unused) +{ + return 0; +} + +static void aslr_tool__init(struct aslr_tool *aslr, struct perf_tool *delegate) +{ + delegate_tool__init(&aslr->tool, delegate); + aslr->tool.tool.ordered_events = true; + + machines__init(&aslr->machines); + + hashmap__init(&aslr->remap_addresses, + remap_addresses__hash, remap_addresses__equal, + /*ctx=*/NULL); + hashmap__init(&aslr->top_addresses, + top_addresses__hash, top_addresses__equal, + /*ctx=*/NULL); + + aslr->tool.tool.sample = aslr_tool__process_sample; + /* read - reads a counter, okay to delegate. */ + aslr->tool.tool.mmap = aslr_tool__process_mmap; + aslr->tool.tool.mmap2 = aslr_tool__process_mmap2; + aslr->tool.tool.comm = aslr_tool__process_comm; + aslr->tool.tool.fork = aslr_tool__process_fork; + aslr->tool.tool.exit = aslr_tool__process_exit; + /* namesspaces, cgroup, lost, lost_sample, aux, */ + /* itrace_start, aux_output_hw_id, context_switch, throttle, unthrottle */ + /* - no virtual addresses. */ + aslr->tool.tool.ksymbol = aslr_tool__process_ksymbol; + /* bpf - no virtual address. */ + aslr->tool.tool.text_poke = aslr_tool__process_text_poke; + /* + * event_update, tracing_data, finished_round, build_id, id_index, + * auxtrace_info, auxtrace_error, time_conv, thread_map, cpu_map, + * stat_config, stat, feature, finished_init, bpf_metadata, compressed, + * auxtrace - no virtual addresses. + */ + aslr->tool.tool.auxtrace = aslr_tool__process_auxtrace; + aslr->tool.tool.auxtrace_info = aslr_tool__process_auxtrace_info; + aslr->tool.tool.auxtrace_error = aslr_tool__process_auxtrace_error; +} + +struct perf_tool *aslr_tool__new(struct perf_tool *delegate) +{ + struct aslr_tool *aslr = zalloc(sizeof(*aslr)); + + if (!aslr) + return NULL; + + aslr_tool__init(aslr, delegate); + return &aslr->tool.tool; +} + +void aslr_tool__delete(struct perf_tool *tool) +{ + struct delegate_tool *del_tool; + struct aslr_tool *aslr; + struct hashmap_entry *cur; + size_t bkt; + + if (!tool) + return; + + del_tool = container_of(tool, struct delegate_tool, tool); + aslr = container_of(del_tool, struct aslr_tool, tool); + + hashmap__for_each_entry(&aslr->remap_addresses, cur, bkt) { + struct remap_addresses_key *key = (struct remap_addresses_key *)cur->pkey; + + if (key) + dso__put(key->dso); + zfree(&cur->pkey); + zfree(&cur->pvalue); + } + hashmap__for_each_entry(&aslr->top_addresses, cur, bkt) { + zfree(&cur->pkey); + zfree(&cur->pvalue); + } + + hashmap__clear(&aslr->remap_addresses); + hashmap__clear(&aslr->top_addresses); + aslr_tool__destroy_machines_priv(&aslr->machines); + machines__destroy_kernel_maps(&aslr->machines); + machines__exit(&aslr->machines); + free(aslr); +} diff --git a/tools/perf/util/aslr.h b/tools/perf/util/aslr.h new file mode 100644 index 000000000000..a9b90bf29540 --- /dev/null +++ b/tools/perf/util/aslr.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __PERF_ASLR_H +#define __PERF_ASLR_H + +#include + +#define ASLR_SUPPORTED_SAMPLE_TYPE ( \ + PERF_SAMPLE_IDENTIFIER | \ + PERF_SAMPLE_IP | \ + PERF_SAMPLE_TID | \ + PERF_SAMPLE_TIME | \ + PERF_SAMPLE_ADDR | \ + PERF_SAMPLE_ID | \ + PERF_SAMPLE_STREAM_ID | \ + PERF_SAMPLE_CPU | \ + PERF_SAMPLE_PERIOD | \ + PERF_SAMPLE_READ | \ + PERF_SAMPLE_CALLCHAIN | \ + PERF_SAMPLE_RAW | \ + PERF_SAMPLE_BRANCH_STACK | \ + PERF_SAMPLE_STACK_USER | \ + PERF_SAMPLE_WEIGHT_TYPE | \ + PERF_SAMPLE_DATA_SRC | \ + PERF_SAMPLE_TRANSACTION | \ + PERF_SAMPLE_PHYS_ADDR | \ + PERF_SAMPLE_CGROUP | \ + PERF_SAMPLE_DATA_PAGE_SIZE | \ + PERF_SAMPLE_CODE_PAGE_SIZE | \ + PERF_SAMPLE_AUX) + +struct perf_tool; +struct evsel; + +struct perf_tool *aslr_tool__new(struct perf_tool *delegate); +void aslr_tool__delete(struct perf_tool *aslr); + +#endif /* __PERF_ASLR_H */ -- 2.54.0.1032.g2f8565e1d1-goog