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252 lines
6.9 KiB
252 lines
6.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/compiler.h> |
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#include <linux/rbtree.h> |
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#include <inttypes.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include "dso.h" |
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#include "map.h" |
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#include "symbol.h" |
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#include <internal/lib.h> // page_size |
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#include "tests.h" |
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#include "debug.h" |
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#include "machine.h" |
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#define UM(x) kallsyms_map->unmap_ip(kallsyms_map, (x)) |
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int test__vmlinux_matches_kallsyms(struct test *test __maybe_unused, int subtest __maybe_unused) |
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{ |
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int err = -1; |
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struct rb_node *nd; |
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struct symbol *sym; |
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struct map *kallsyms_map, *vmlinux_map, *map; |
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struct machine kallsyms, vmlinux; |
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struct maps *maps = machine__kernel_maps(&vmlinux); |
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u64 mem_start, mem_end; |
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bool header_printed; |
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/* |
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* Step 1: |
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* |
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* Init the machines that will hold kernel, modules obtained from |
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* both vmlinux + .ko files and from /proc/kallsyms split by modules. |
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*/ |
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machine__init(&kallsyms, "", HOST_KERNEL_ID); |
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machine__init(&vmlinux, "", HOST_KERNEL_ID); |
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/* |
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* Step 2: |
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* |
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* Create the kernel maps for kallsyms and the DSO where we will then |
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* load /proc/kallsyms. Also create the modules maps from /proc/modules |
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* and find the .ko files that match them in /lib/modules/`uname -r`/. |
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*/ |
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if (machine__create_kernel_maps(&kallsyms) < 0) { |
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pr_debug("machine__create_kernel_maps "); |
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goto out; |
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} |
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/* |
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* Step 3: |
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* |
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* Load and split /proc/kallsyms into multiple maps, one per module. |
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* Do not use kcore, as this test was designed before kcore support |
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* and has parts that only make sense if using the non-kcore code. |
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* XXX: extend it to stress the kcorre code as well, hint: the list |
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* of modules extracted from /proc/kcore, in its current form, can't |
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* be compacted against the list of modules found in the "vmlinux" |
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* code and with the one got from /proc/modules from the "kallsyms" code. |
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*/ |
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if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms") <= 0) { |
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pr_debug("dso__load_kallsyms "); |
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goto out; |
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} |
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/* |
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* Step 4: |
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* |
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* kallsyms will be internally on demand sorted by name so that we can |
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* find the reference relocation * symbol, i.e. the symbol we will use |
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* to see if the running kernel was relocated by checking if it has the |
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* same value in the vmlinux file we load. |
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*/ |
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kallsyms_map = machine__kernel_map(&kallsyms); |
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/* |
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* Step 5: |
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* |
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* Now repeat step 2, this time for the vmlinux file we'll auto-locate. |
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*/ |
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if (machine__create_kernel_maps(&vmlinux) < 0) { |
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pr_debug("machine__create_kernel_maps "); |
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goto out; |
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} |
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vmlinux_map = machine__kernel_map(&vmlinux); |
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/* |
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* Step 6: |
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* |
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* Locate a vmlinux file in the vmlinux path that has a buildid that |
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* matches the one of the running kernel. |
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* |
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* While doing that look if we find the ref reloc symbol, if we find it |
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* we'll have its ref_reloc_symbol.unrelocated_addr and then |
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* maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines |
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* to fixup the symbols. |
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*/ |
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if (machine__load_vmlinux_path(&vmlinux) <= 0) { |
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pr_debug("Couldn't find a vmlinux that matches the kernel running on this machine, skipping test\n"); |
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err = TEST_SKIP; |
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goto out; |
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} |
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err = 0; |
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/* |
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* Step 7: |
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* |
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* Now look at the symbols in the vmlinux DSO and check if we find all of them |
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* in the kallsyms dso. For the ones that are in both, check its names and |
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* end addresses too. |
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*/ |
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map__for_each_symbol(vmlinux_map, sym, nd) { |
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struct symbol *pair, *first_pair; |
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sym = rb_entry(nd, struct symbol, rb_node); |
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if (sym->start == sym->end) |
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continue; |
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mem_start = vmlinux_map->unmap_ip(vmlinux_map, sym->start); |
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mem_end = vmlinux_map->unmap_ip(vmlinux_map, sym->end); |
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first_pair = machine__find_kernel_symbol(&kallsyms, mem_start, NULL); |
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pair = first_pair; |
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if (pair && UM(pair->start) == mem_start) { |
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next_pair: |
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if (arch__compare_symbol_names(sym->name, pair->name) == 0) { |
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/* |
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* kallsyms don't have the symbol end, so we |
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* set that by using the next symbol start - 1, |
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* in some cases we get this up to a page |
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* wrong, trace_kmalloc when I was developing |
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* this code was one such example, 2106 bytes |
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* off the real size. More than that and we |
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* _really_ have a problem. |
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*/ |
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s64 skew = mem_end - UM(pair->end); |
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if (llabs(skew) >= page_size) |
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pr_debug("WARN: %#" PRIx64 ": diff end addr for %s v: %#" PRIx64 " k: %#" PRIx64 "\n", |
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mem_start, sym->name, mem_end, |
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UM(pair->end)); |
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/* |
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* Do not count this as a failure, because we |
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* could really find a case where it's not |
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* possible to get proper function end from |
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* kallsyms. |
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*/ |
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continue; |
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} else { |
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pair = machine__find_kernel_symbol_by_name(&kallsyms, sym->name, NULL); |
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if (pair) { |
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if (UM(pair->start) == mem_start) |
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goto next_pair; |
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pr_debug("WARN: %#" PRIx64 ": diff name v: %s k: %s\n", |
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mem_start, sym->name, pair->name); |
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} else { |
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pr_debug("WARN: %#" PRIx64 ": diff name v: %s k: %s\n", |
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mem_start, sym->name, first_pair->name); |
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} |
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continue; |
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} |
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} else if (mem_start == kallsyms.vmlinux_map->end) { |
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/* |
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* Ignore aliases to _etext, i.e. to the end of the kernel text area, |
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* such as __indirect_thunk_end. |
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*/ |
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continue; |
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} else { |
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pr_debug("ERR : %#" PRIx64 ": %s not on kallsyms\n", |
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mem_start, sym->name); |
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} |
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err = -1; |
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} |
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if (verbose <= 0) |
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goto out; |
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header_printed = false; |
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maps__for_each_entry(maps, map) { |
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struct map * |
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/* |
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* If it is the kernel, kallsyms is always "[kernel.kallsyms]", while |
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* the kernel will have the path for the vmlinux file being used, |
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* so use the short name, less descriptive but the same ("[kernel]" in |
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* both cases. |
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*/ |
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pair = maps__find_by_name(&kallsyms.kmaps, (map->dso->kernel ? |
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map->dso->short_name : |
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map->dso->name)); |
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if (pair) { |
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pair->priv = 1; |
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} else { |
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if (!header_printed) { |
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pr_info("WARN: Maps only in vmlinux:\n"); |
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header_printed = true; |
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} |
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map__fprintf(map, stderr); |
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} |
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} |
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header_printed = false; |
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maps__for_each_entry(maps, map) { |
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struct map *pair; |
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mem_start = vmlinux_map->unmap_ip(vmlinux_map, map->start); |
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mem_end = vmlinux_map->unmap_ip(vmlinux_map, map->end); |
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pair = maps__find(&kallsyms.kmaps, mem_start); |
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if (pair == NULL || pair->priv) |
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continue; |
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if (pair->start == mem_start) { |
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if (!header_printed) { |
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pr_info("WARN: Maps in vmlinux with a different name in kallsyms:\n"); |
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header_printed = true; |
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} |
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pr_info("WARN: %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s in kallsyms as", |
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map->start, map->end, map->pgoff, map->dso->name); |
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if (mem_end != pair->end) |
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pr_info(":\nWARN: *%" PRIx64 "-%" PRIx64 " %" PRIx64, |
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pair->start, pair->end, pair->pgoff); |
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pr_info(" %s\n", pair->dso->name); |
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pair->priv = 1; |
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} |
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} |
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header_printed = false; |
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maps = machine__kernel_maps(&kallsyms); |
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maps__for_each_entry(maps, map) { |
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if (!map->priv) { |
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if (!header_printed) { |
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pr_info("WARN: Maps only in kallsyms:\n"); |
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header_printed = true; |
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} |
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map__fprintf(map, stderr); |
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} |
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} |
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out: |
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machine__exit(&kallsyms); |
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machine__exit(&vmlinux); |
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return err; |
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}
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