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https://github.com/dynup/kpatch
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Merge pull request #659 from joe-lawrence/4.9-unwinder
RFC - 4.9 unwinder
This commit is contained in:
Jessica Yu
GitHub
commit
8e1aef2893
134
kmod/core/core.c
134
kmod/core/core.c
@ -44,6 +44,7 @@
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#include <linux/kallsyms.h>
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#include <linux/version.h>
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#include <linux/string.h>
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#include <linux/stacktrace.h>
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#include <asm/stacktrace.h>
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#include <asm/cacheflush.h>
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#include <generated/utsrelease.h>
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@ -74,11 +75,6 @@ static struct kobject *kpatch_root_kobj;
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struct kobject *kpatch_patches_kobj;
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EXPORT_SYMBOL_GPL(kpatch_patches_kobj);
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struct kpatch_backtrace_args {
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struct kpatch_module *kpmod;
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int ret;
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};
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struct kpatch_kallsyms_args {
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const char *objname;
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const char *name;
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@ -142,6 +138,13 @@ static atomic_t kpatch_state;
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static int (*kpatch_set_memory_rw)(unsigned long addr, int numpages);
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static int (*kpatch_set_memory_ro)(unsigned long addr, int numpages);
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#define MAX_STACK_TRACE_DEPTH 64
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static unsigned long stack_entries[MAX_STACK_TRACE_DEPTH];
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struct stack_trace trace = {
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.max_entries = ARRAY_SIZE(stack_entries),
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.entries = &stack_entries[0],
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};
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static inline void kpatch_state_idle(void)
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{
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int state = atomic_read(&kpatch_state);
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@ -203,24 +206,12 @@ static inline int kpatch_compare_addresses(unsigned long stack_addr,
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return 0;
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}
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0)
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#define BACKTRACE_ADDRESS_VERIFY_RETURN_TYPE void
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#define BACKTRACE_ADDRESS_VERIFY_RETURN_ARG
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#else
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#define BACKTRACE_ADDRESS_VERIFY_RETURN_TYPE int
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#define BACKTRACE_ADDRESS_VERIFY_RETURN_ARG args->ret
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#endif
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static BACKTRACE_ADDRESS_VERIFY_RETURN_TYPE
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kpatch_backtrace_address_verify(void *data, unsigned long address, int reliable)
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static int kpatch_backtrace_address_verify(struct kpatch_module *kpmod,
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unsigned long address)
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{
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struct kpatch_backtrace_args *args = data;
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struct kpatch_module *kpmod = args->kpmod;
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struct kpatch_func *func;
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int i;
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if (args->ret)
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return BACKTRACE_ADDRESS_VERIFY_RETURN_ARG;
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int ret;
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/* check kpmod funcs */
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do_for_each_linked_func(kpmod, func) {
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@ -244,68 +235,27 @@ kpatch_backtrace_address_verify(void *data, unsigned long address, int reliable)
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func_name = active_func->name;
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}
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args->ret = kpatch_compare_addresses(address, func_addr,
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func_size, func_name);
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if (args->ret)
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return BACKTRACE_ADDRESS_VERIFY_RETURN_ARG;
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ret = kpatch_compare_addresses(address, func_addr,
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func_size, func_name);
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if (ret)
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return ret;
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} while_for_each_linked_func();
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/* in the replace case, need to check the func hash as well */
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hash_for_each_rcu(kpatch_func_hash, i, func, node) {
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if (func->op == KPATCH_OP_UNPATCH && !func->force) {
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args->ret = kpatch_compare_addresses(address,
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func->new_addr,
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func->new_size,
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func->name);
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if (args->ret)
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return BACKTRACE_ADDRESS_VERIFY_RETURN_ARG;
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ret = kpatch_compare_addresses(address,
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func->new_addr,
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func->new_size,
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func->name);
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if (ret)
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return ret;
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}
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}
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return BACKTRACE_ADDRESS_VERIFY_RETURN_ARG;
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return ret;
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}
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static int kpatch_backtrace_stack(void *data, char *name)
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{
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return 0;
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}
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static const struct stacktrace_ops kpatch_backtrace_ops = {
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.address = kpatch_backtrace_address_verify,
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.stack = kpatch_backtrace_stack,
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.walk_stack = print_context_stack_bp,
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};
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static int kpatch_print_trace_stack(void *data, char *name)
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{
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pr_cont(" <%s> ", name);
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return 0;
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}
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0)
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static void kpatch_print_trace_address(void *data, unsigned long addr,
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int reliable)
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{
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if (reliable)
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pr_info("[<%p>] %pB\n", (void *)addr, (void *)addr);
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}
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#else
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static int kpatch_print_trace_address(void *data, unsigned long addr,
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int reliable)
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{
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if (reliable)
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pr_info("[<%p>] %pB\n", (void *)addr, (void *)addr);
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return 0;
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}
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#endif
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static const struct stacktrace_ops kpatch_print_trace_ops = {
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.stack = kpatch_print_trace_stack,
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.address = kpatch_print_trace_address,
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.walk_stack = print_context_stack,
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};
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/*
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* Verify activeness safety, i.e. that none of the to-be-patched functions are
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* on the stack of any task.
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@ -315,26 +265,44 @@ static const struct stacktrace_ops kpatch_print_trace_ops = {
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static int kpatch_verify_activeness_safety(struct kpatch_module *kpmod)
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{
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struct task_struct *g, *t;
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int i;
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int ret = 0;
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struct kpatch_backtrace_args args = {
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.kpmod = kpmod,
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.ret = 0
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};
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/* Check the stacks of all tasks. */
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do_each_thread(g, t) {
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dump_trace(t, NULL, NULL, 0, &kpatch_backtrace_ops, &args);
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if (args.ret) {
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ret = args.ret;
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pr_info("PID: %d Comm: %.20s\n", t->pid, t->comm);
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dump_trace(t, NULL, (unsigned long *)t->thread.sp,
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0, &kpatch_print_trace_ops, NULL);
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trace.nr_entries = 0;
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save_stack_trace_tsk(t, &trace);
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if (trace.nr_entries >= trace.max_entries) {
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ret = -EBUSY;
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pr_err("more than %u trace entries!\n",
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trace.max_entries);
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goto out;
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}
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for (i = 0; i < trace.nr_entries; i++) {
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if (trace.entries[i] == ULONG_MAX)
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break;
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ret = kpatch_backtrace_address_verify(kpmod,
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trace.entries[i]);
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if (ret)
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goto out;
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}
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} while_each_thread(g, t);
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out:
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if (ret) {
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pr_err("PID: %d Comm: %.20s\n", t->pid, t->comm);
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for (i = 0; i < trace.nr_entries; i++) {
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if (trace.entries[i] == ULONG_MAX)
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break;
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pr_err(" [<%pK>] %pB\n",
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(void *)trace.entries[i],
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(void *)trace.entries[i]);
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}
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}
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return ret;
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}
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@ -580,6 +580,8 @@ for i in $FILES; do
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[[ $DISTRO = rhel ]] || [[ $DISTRO = centos ]] || [[ $DISTRO = ol ]] && \
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[[ $i = arch/x86/lib/copy_user_64.o ]] && continue
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[[ $i = usr/initramfs_data.o ]] && continue
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mkdir -p "output/$(dirname $i)"
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cd "$OBJDIR"
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find_kobj $i
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