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https://mirrors.bfsu.edu.cn/git/linux.git
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daa22f5a78
Summary of the changes worth highlighting from most interesting to boring below: * Christoph Hellwig's symbol_get() fix to Nvidia's efforts to circumvent the protection he put in place in year 2020 to prevent proprietary modules from using GPL only symbols, and also ensuring proprietary modules which export symbols grandfather their taint. That was done through year 2020 commit262e6ae708
("modules: inherit TAINT_PROPRIETARY_MODULE"). Christoph's new fix is done by clarifing __symbol_get() was only ever intended to prevent module reference loops by Linux kernel modules and so making it only find symbols exported via EXPORT_SYMBOL_GPL(). The circumvention tactic used by Nvidia was to use symbol_get() to purposely swift through proprietary module symbols and completley bypass our traditional EXPORT_SYMBOL*() annotations and community agreed upon restrictions. A small set of preamble patches fix up a few symbols which just needed adjusting for this on two modules, the rtc ds1685 and the networking enetc module. Two other modules just needed some build fixing and removal of use of __symbol_get() as they can't ever be modular, as was done by Arnd on the ARM pxa module and Christoph did on the mmc au1xmmc driver. This is a good reminder to us that symbol_get() is just a hack to address things which should be fixed through Kconfig at build time as was done in the later patches, and so ultimately it should just go. * Extremely late minor fix for old module layout055f23b74b
("module: check for exit sections in layout_sections() instead of module_init_section()") by James Morse for arm64. Note that this layout thing is old, it is *not* Song Liu's commitac3b432839
("module: replace module_layout with module_memory"). The issue however is very odd to run into and so there was no hurry to get this in fast. * Although the fix did not go through the modules tree I'd like to highlight the fix by Peter Zijlstra in commit5409730962
("x86/static_call: Fix __static_call_fixup()") now merged in your tree which came out of what was originally suspected to be a fallout of the the newer module layout changes by Song Liu commitac3b432839
("module: replace module_layout with module_memory") instead of module_init_section()"). Thanks to the report by Christian Bricart and the debugging by Song Liu & Peter that turned to be noted as a kernel regression in place since v5.19 through commitee88d363d1
("x86,static_call: Use alternative RET encoding"). I highlight this to reflect and clarify that we haven't seen more fallout fromac3b432839
("module: replace module_layout with module_memory"). * RISC-V toolchain got mapping symbol support which prefix symbols with "$" to help with alignment considerations for disassembly. This is used to differentiate between incompatible instruction encodings when disassembling. RISC-V just matches what ARM/AARCH64 did for alignment considerations and Palmer Dabbelt extended is_mapping_symbol() to accept these symbols for RISC-V. We already had support for this for all architectures but it also checked for the second character, the RISC-V check Dabbelt added was just for the "$". After a bit of testing and fallout on linux-next and based on feedback from Masahiro Yamada it was decided to simplify the check and treat the first char "$" as unique for all architectures, and so we no make is_mapping_symbol() for all archs if the symbol starts with "$". The most relevant commit for this for RISC-V on binutils was: https://sourceware.org/pipermail/binutils/2021-July/117350.html * A late fix by Andrea Righi (today) to make module zstd decompression use vmalloc() instead of kmalloc() to account for large compressed modules. I suspect we'll see similar things for other decompression algorithms soon. * samples/hw_breakpoint minor fixes by Rong Tao, Arnd Bergmann and Chen Jiahao -----BEGIN PGP SIGNATURE----- iQJGBAABCgAwFiEENnNq2KuOejlQLZofziMdCjCSiKcFAmTuShISHG1jZ3JvZkBr ZXJuZWwub3JnAAoJEM4jHQowkoin7rEQAIt9cGmkHyA6Po/Ex8DejWvSTTOQzIXk NvtGurODghWnCejZ7Yofo1T48mvgHOenDQB9qNSkVtKDyhmWCbss6wQU/5M8Mc3A G+9svkQ8H1BRzTwX3WJKF9KNMhI0HA0CXz3ED/I4iX/Q4Ffv3bgbAiitY6r48lJV PSKPzwH9QMIti6k3j+bFf2SwWCV3X2jz+btdxwY34dVFyggdYgaBNKEdrumCx4nL g0tQQxI8QgltOnwlfOPLEhdSU1yWyIWZtqtki6xksLziwTreRaw1HotgXQDpnt/S iJY9xiKN1ChtVSprQlbTb9yhFbCEGvOYGEaKl/ZsGENQjKzRWsQ+dtT8Ww6n2Y1H aJXwniv6SqCW7dCwdKo4sE7JFYDP56yFYKBLOPSPbMm6DJwTMbzLUf7TGNh6NKyl 3pqjGagJ+LTj3l9w5ur4zTrDGAmLzMpNR03+6niTM7C3TPOI1+wh5zGbvtoA/WdA ytQeOTiUsi0uyVgk50f67IC6virrxwupeyZQlYFGNuEGBClgXzzzgw/MKwg0VMvc aWhFPUOLx8/8juJ3A5qiOT+znQJ2DTqWlT+QkQ8R5qFVXEW1g9IOnhaHqDX+KB0A OPlZ9xwss2U0Zd1XhourtqhUhvcODWNzTj3oPzjdrGiBjdENz8hPKP+7HV1CG6xy RdxpSwu72kFu =IQy2 -----END PGP SIGNATURE----- Merge tag 'modules-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux Pull modules updates from Luis Chamberlain: "Summary of the changes worth highlighting from most interesting to boring below: - Christoph Hellwig's symbol_get() fix to Nvidia's efforts to circumvent the protection he put in place in year 2020 to prevent proprietary modules from using GPL only symbols, and also ensuring proprietary modules which export symbols grandfather their taint. That was done through year 2020 commit262e6ae708
("modules: inherit TAINT_PROPRIETARY_MODULE"). Christoph's new fix is done by clarifing __symbol_get() was only ever intended to prevent module reference loops by Linux kernel modules and so making it only find symbols exported via EXPORT_SYMBOL_GPL(). The circumvention tactic used by Nvidia was to use symbol_get() to purposely swift through proprietary module symbols and completely bypass our traditional EXPORT_SYMBOL*() annotations and community agreed upon restrictions. A small set of preamble patches fix up a few symbols which just needed adjusting for this on two modules, the rtc ds1685 and the networking enetc module. Two other modules just needed some build fixing and removal of use of __symbol_get() as they can't ever be modular, as was done by Arnd on the ARM pxa module and Christoph did on the mmc au1xmmc driver. This is a good reminder to us that symbol_get() is just a hack to address things which should be fixed through Kconfig at build time as was done in the later patches, and so ultimately it should just go. - Extremely late minor fix for old module layout055f23b74b
("module: check for exit sections in layout_sections() instead of module_init_section()") by James Morse for arm64. Note that this layout thing is old, it is *not* Song Liu's commitac3b432839
("module: replace module_layout with module_memory"). The issue however is very odd to run into and so there was no hurry to get this in fast. - Although the fix did not go through the modules tree I'd like to highlight the fix by Peter Zijlstra in commit5409730962
("x86/static_call: Fix __static_call_fixup()") now merged in your tree which came out of what was originally suspected to be a fallout of the the newer module layout changes by Song Liu commitac3b432839
("module: replace module_layout with module_memory") instead of module_init_section()"). Thanks to the report by Christian Bricart and the debugging by Song Liu & Peter that turned to be noted as a kernel regression in place since v5.19 through commitee88d363d1
("x86,static_call: Use alternative RET encoding"). I highlight this to reflect and clarify that we haven't seen more fallout fromac3b432839
("module: replace module_layout with module_memory"). - RISC-V toolchain got mapping symbol support which prefix symbols with "$" to help with alignment considerations for disassembly. This is used to differentiate between incompatible instruction encodings when disassembling. RISC-V just matches what ARM/AARCH64 did for alignment considerations and Palmer Dabbelt extended is_mapping_symbol() to accept these symbols for RISC-V. We already had support for this for all architectures but it also checked for the second character, the RISC-V check Dabbelt added was just for the "$". After a bit of testing and fallout on linux-next and based on feedback from Masahiro Yamada it was decided to simplify the check and treat the first char "$" as unique for all architectures, and so we no make is_mapping_symbol() for all archs if the symbol starts with "$". The most relevant commit for this for RISC-V on binutils was: https://sourceware.org/pipermail/binutils/2021-July/117350.html - A late fix by Andrea Righi (today) to make module zstd decompression use vmalloc() instead of kmalloc() to account for large compressed modules. I suspect we'll see similar things for other decompression algorithms soon. - samples/hw_breakpoint minor fixes by Rong Tao, Arnd Bergmann and Chen Jiahao" * tag 'modules-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux: module/decompress: use vmalloc() for zstd decompression workspace kallsyms: Add more debug output for selftest ARM: module: Use module_init_layout_section() to spot init sections arm64: module: Use module_init_layout_section() to spot init sections module: Expose module_init_layout_section() modules: only allow symbol_get of EXPORT_SYMBOL_GPL modules rtc: ds1685: use EXPORT_SYMBOL_GPL for ds1685_rtc_poweroff net: enetc: use EXPORT_SYMBOL_GPL for enetc_phc_index mmc: au1xmmc: force non-modular build and remove symbol_get usage ARM: pxa: remove use of symbol_get() samples/hw_breakpoint: mark sample_hbp as static samples/hw_breakpoint: fix building without module unloading samples/hw_breakpoint: Fix kernel BUG 'invalid opcode: 0000' modpost, kallsyms: Treat add '$'-prefixed symbols as mapping symbols kernel: params: Remove unnecessary ‘0’ values from err module: Ignore RISC-V mapping symbols too
470 lines
10 KiB
C
470 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Test the function and performance of kallsyms
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*
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* Copyright (C) Huawei Technologies Co., Ltd., 2022
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*
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* Authors: Zhen Lei <thunder.leizhen@huawei.com> Huawei
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*/
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#define pr_fmt(fmt) "kallsyms_selftest: " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/random.h>
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#include <linux/sched/clock.h>
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#include <linux/kthread.h>
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#include <linux/vmalloc.h>
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#include "kallsyms_internal.h"
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#include "kallsyms_selftest.h"
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#define MAX_NUM_OF_RECORDS 64
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struct test_stat {
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int min;
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int max;
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int save_cnt;
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int real_cnt;
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int perf;
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u64 sum;
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char *name;
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unsigned long addr;
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unsigned long addrs[MAX_NUM_OF_RECORDS];
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};
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struct test_item {
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char *name;
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unsigned long addr;
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};
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#define ITEM_FUNC(s) \
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{ \
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.name = #s, \
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.addr = (unsigned long)s, \
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}
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#define ITEM_DATA(s) \
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{ \
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.name = #s, \
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.addr = (unsigned long)&s, \
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}
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static int kallsyms_test_var_bss_static;
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static int kallsyms_test_var_data_static = 1;
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int kallsyms_test_var_bss;
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int kallsyms_test_var_data = 1;
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static int kallsyms_test_func_static(void)
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{
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kallsyms_test_var_bss_static++;
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kallsyms_test_var_data_static++;
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return 0;
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}
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int kallsyms_test_func(void)
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{
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return kallsyms_test_func_static();
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}
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__weak int kallsyms_test_func_weak(void)
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{
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kallsyms_test_var_bss++;
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kallsyms_test_var_data++;
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return 0;
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}
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static struct test_item test_items[] = {
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ITEM_FUNC(kallsyms_test_func_static),
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ITEM_FUNC(kallsyms_test_func),
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ITEM_FUNC(kallsyms_test_func_weak),
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ITEM_FUNC(vmalloc),
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ITEM_FUNC(vfree),
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#ifdef CONFIG_KALLSYMS_ALL
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ITEM_DATA(kallsyms_test_var_bss_static),
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ITEM_DATA(kallsyms_test_var_data_static),
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ITEM_DATA(kallsyms_test_var_bss),
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ITEM_DATA(kallsyms_test_var_data),
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ITEM_DATA(vmap_area_list),
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#endif
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};
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static char stub_name[KSYM_NAME_LEN];
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static int stat_symbol_len(void *data, const char *name, unsigned long addr)
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{
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*(u32 *)data += strlen(name);
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return 0;
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}
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static void test_kallsyms_compression_ratio(void)
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{
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u32 pos, off, len, num;
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u32 ratio, total_size, total_len = 0;
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kallsyms_on_each_symbol(stat_symbol_len, &total_len);
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/*
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* A symbol name cannot start with a number. This stub name helps us
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* traverse the entire symbol table without finding a match. It's used
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* for subsequent performance tests, and its length is the average
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* length of all symbol names.
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*/
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memset(stub_name, '4', sizeof(stub_name));
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pos = total_len / kallsyms_num_syms;
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stub_name[pos] = 0;
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pos = 0;
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num = 0;
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off = 0;
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while (pos < kallsyms_num_syms) {
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len = kallsyms_names[off];
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num++;
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off++;
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pos++;
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if ((len & 0x80) != 0) {
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len = (len & 0x7f) | (kallsyms_names[off] << 7);
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num++;
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off++;
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}
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off += len;
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}
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/*
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* 1. The length fields is not counted
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* 2. The memory occupied by array kallsyms_token_table[] and
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* kallsyms_token_index[] needs to be counted.
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*/
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total_size = off - num;
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pos = kallsyms_token_index[0xff];
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total_size += pos + strlen(&kallsyms_token_table[pos]) + 1;
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total_size += 0x100 * sizeof(u16);
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pr_info(" ---------------------------------------------------------\n");
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pr_info("| nr_symbols | compressed size | original size | ratio(%%) |\n");
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pr_info("|---------------------------------------------------------|\n");
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ratio = (u32)div_u64(10000ULL * total_size, total_len);
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pr_info("| %10d | %10d | %10d | %2d.%-2d |\n",
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kallsyms_num_syms, total_size, total_len, ratio / 100, ratio % 100);
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pr_info(" ---------------------------------------------------------\n");
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}
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static int lookup_name(void *data, const char *name, unsigned long addr)
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{
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u64 t0, t1, t;
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struct test_stat *stat = (struct test_stat *)data;
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t0 = ktime_get_ns();
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(void)kallsyms_lookup_name(name);
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t1 = ktime_get_ns();
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t = t1 - t0;
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if (t < stat->min)
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stat->min = t;
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if (t > stat->max)
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stat->max = t;
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stat->real_cnt++;
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stat->sum += t;
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return 0;
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}
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static void test_perf_kallsyms_lookup_name(void)
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{
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struct test_stat stat;
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memset(&stat, 0, sizeof(stat));
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stat.min = INT_MAX;
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kallsyms_on_each_symbol(lookup_name, &stat);
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pr_info("kallsyms_lookup_name() looked up %d symbols\n", stat.real_cnt);
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pr_info("The time spent on each symbol is (ns): min=%d, max=%d, avg=%lld\n",
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stat.min, stat.max, div_u64(stat.sum, stat.real_cnt));
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}
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static bool match_cleanup_name(const char *s, const char *name)
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{
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char *p;
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int len;
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if (!IS_ENABLED(CONFIG_LTO_CLANG))
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return false;
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p = strstr(s, ".llvm.");
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if (!p)
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return false;
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len = strlen(name);
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if (p - s != len)
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return false;
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return !strncmp(s, name, len);
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}
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static int find_symbol(void *data, const char *name, unsigned long addr)
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{
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struct test_stat *stat = (struct test_stat *)data;
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if (strcmp(name, stat->name) == 0 ||
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(!stat->perf && match_cleanup_name(name, stat->name))) {
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stat->real_cnt++;
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stat->addr = addr;
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if (stat->save_cnt < MAX_NUM_OF_RECORDS) {
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stat->addrs[stat->save_cnt] = addr;
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stat->save_cnt++;
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}
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if (stat->real_cnt == stat->max)
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return 1;
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}
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return 0;
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}
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static void test_perf_kallsyms_on_each_symbol(void)
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{
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u64 t0, t1;
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struct test_stat stat;
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memset(&stat, 0, sizeof(stat));
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stat.max = INT_MAX;
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stat.name = stub_name;
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stat.perf = 1;
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t0 = ktime_get_ns();
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kallsyms_on_each_symbol(find_symbol, &stat);
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t1 = ktime_get_ns();
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pr_info("kallsyms_on_each_symbol() traverse all: %lld ns\n", t1 - t0);
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}
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static int match_symbol(void *data, unsigned long addr)
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{
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struct test_stat *stat = (struct test_stat *)data;
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stat->real_cnt++;
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stat->addr = addr;
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if (stat->save_cnt < MAX_NUM_OF_RECORDS) {
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stat->addrs[stat->save_cnt] = addr;
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stat->save_cnt++;
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}
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if (stat->real_cnt == stat->max)
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return 1;
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return 0;
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}
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static void test_perf_kallsyms_on_each_match_symbol(void)
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{
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u64 t0, t1;
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struct test_stat stat;
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memset(&stat, 0, sizeof(stat));
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stat.max = INT_MAX;
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stat.name = stub_name;
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t0 = ktime_get_ns();
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kallsyms_on_each_match_symbol(match_symbol, stat.name, &stat);
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t1 = ktime_get_ns();
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pr_info("kallsyms_on_each_match_symbol() traverse all: %lld ns\n", t1 - t0);
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}
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static int test_kallsyms_basic_function(void)
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{
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int i, j, ret;
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int next = 0, nr_failed = 0;
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char *prefix;
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unsigned short rand;
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unsigned long addr, lookup_addr;
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char namebuf[KSYM_NAME_LEN];
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struct test_stat *stat, *stat2;
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stat = kmalloc(sizeof(*stat) * 2, GFP_KERNEL);
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if (!stat)
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return -ENOMEM;
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stat2 = stat + 1;
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prefix = "kallsyms_lookup_name() for";
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for (i = 0; i < ARRAY_SIZE(test_items); i++) {
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addr = kallsyms_lookup_name(test_items[i].name);
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if (addr != test_items[i].addr) {
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nr_failed++;
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pr_info("%s %s failed: addr=%lx, expect %lx\n",
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prefix, test_items[i].name, addr, test_items[i].addr);
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}
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}
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prefix = "kallsyms_on_each_symbol() for";
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for (i = 0; i < ARRAY_SIZE(test_items); i++) {
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memset(stat, 0, sizeof(*stat));
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stat->max = INT_MAX;
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stat->name = test_items[i].name;
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kallsyms_on_each_symbol(find_symbol, stat);
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if (stat->addr != test_items[i].addr || stat->real_cnt != 1) {
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nr_failed++;
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pr_info("%s %s failed: count=%d, addr=%lx, expect %lx\n",
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prefix, test_items[i].name,
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stat->real_cnt, stat->addr, test_items[i].addr);
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}
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}
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prefix = "kallsyms_on_each_match_symbol() for";
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for (i = 0; i < ARRAY_SIZE(test_items); i++) {
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memset(stat, 0, sizeof(*stat));
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stat->max = INT_MAX;
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stat->name = test_items[i].name;
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kallsyms_on_each_match_symbol(match_symbol, test_items[i].name, stat);
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if (stat->addr != test_items[i].addr || stat->real_cnt != 1) {
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nr_failed++;
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pr_info("%s %s failed: count=%d, addr=%lx, expect %lx\n",
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prefix, test_items[i].name,
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stat->real_cnt, stat->addr, test_items[i].addr);
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}
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}
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if (nr_failed) {
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kfree(stat);
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return -ESRCH;
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}
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for (i = 0; i < kallsyms_num_syms; i++) {
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addr = kallsyms_sym_address(i);
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if (!is_ksym_addr(addr))
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continue;
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ret = lookup_symbol_name(addr, namebuf);
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if (unlikely(ret)) {
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namebuf[0] = 0;
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pr_info("%d: lookup_symbol_name(%lx) failed\n", i, addr);
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goto failed;
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|
}
|
|
|
|
lookup_addr = kallsyms_lookup_name(namebuf);
|
|
|
|
memset(stat, 0, sizeof(*stat));
|
|
stat->max = INT_MAX;
|
|
kallsyms_on_each_match_symbol(match_symbol, namebuf, stat);
|
|
|
|
/*
|
|
* kallsyms_on_each_symbol() is too slow, randomly select some
|
|
* symbols for test.
|
|
*/
|
|
if (i >= next) {
|
|
memset(stat2, 0, sizeof(*stat2));
|
|
stat2->max = INT_MAX;
|
|
stat2->name = namebuf;
|
|
kallsyms_on_each_symbol(find_symbol, stat2);
|
|
|
|
/*
|
|
* kallsyms_on_each_symbol() and kallsyms_on_each_match_symbol()
|
|
* need to get the same traversal result.
|
|
*/
|
|
if (stat->addr != stat2->addr ||
|
|
stat->real_cnt != stat2->real_cnt ||
|
|
memcmp(stat->addrs, stat2->addrs,
|
|
stat->save_cnt * sizeof(stat->addrs[0]))) {
|
|
pr_info("%s: mismatch between kallsyms_on_each_symbol() and kallsyms_on_each_match_symbol()\n",
|
|
namebuf);
|
|
goto failed;
|
|
}
|
|
|
|
/*
|
|
* The average of random increments is 128, that is, one of
|
|
* them is tested every 128 symbols.
|
|
*/
|
|
get_random_bytes(&rand, sizeof(rand));
|
|
next = i + (rand & 0xff) + 1;
|
|
}
|
|
|
|
/* Need to be found at least once */
|
|
if (!stat->real_cnt) {
|
|
pr_info("%s: Never found\n", namebuf);
|
|
goto failed;
|
|
}
|
|
|
|
/*
|
|
* kallsyms_lookup_name() returns the address of the first
|
|
* symbol found and cannot be NULL.
|
|
*/
|
|
if (!lookup_addr) {
|
|
pr_info("%s: NULL lookup_addr?!\n", namebuf);
|
|
goto failed;
|
|
}
|
|
if (lookup_addr != stat->addrs[0]) {
|
|
pr_info("%s: lookup_addr != stat->addrs[0]\n", namebuf);
|
|
goto failed;
|
|
}
|
|
|
|
/*
|
|
* If the addresses of all matching symbols are recorded, the
|
|
* target address needs to be exist.
|
|
*/
|
|
if (stat->real_cnt <= MAX_NUM_OF_RECORDS) {
|
|
for (j = 0; j < stat->save_cnt; j++) {
|
|
if (stat->addrs[j] == addr)
|
|
break;
|
|
}
|
|
|
|
if (j == stat->save_cnt) {
|
|
pr_info("%s: j == save_cnt?!\n", namebuf);
|
|
goto failed;
|
|
}
|
|
}
|
|
}
|
|
|
|
kfree(stat);
|
|
|
|
return 0;
|
|
|
|
failed:
|
|
pr_info("Test for %dth symbol failed: (%s) addr=%lx", i, namebuf, addr);
|
|
kfree(stat);
|
|
return -ESRCH;
|
|
}
|
|
|
|
static int test_entry(void *p)
|
|
{
|
|
int ret;
|
|
|
|
do {
|
|
schedule_timeout(5 * HZ);
|
|
} while (system_state != SYSTEM_RUNNING);
|
|
|
|
pr_info("start\n");
|
|
ret = test_kallsyms_basic_function();
|
|
if (ret) {
|
|
pr_info("abort\n");
|
|
return 0;
|
|
}
|
|
|
|
test_kallsyms_compression_ratio();
|
|
test_perf_kallsyms_lookup_name();
|
|
test_perf_kallsyms_on_each_symbol();
|
|
test_perf_kallsyms_on_each_match_symbol();
|
|
pr_info("finish\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init kallsyms_test_init(void)
|
|
{
|
|
struct task_struct *t;
|
|
|
|
t = kthread_create(test_entry, NULL, "kallsyms_test");
|
|
if (IS_ERR(t)) {
|
|
pr_info("Create kallsyms selftest task failed\n");
|
|
return PTR_ERR(t);
|
|
}
|
|
kthread_bind(t, 0);
|
|
wake_up_process(t);
|
|
|
|
return 0;
|
|
}
|
|
late_initcall(kallsyms_test_init);
|