From 87e5b1e8f257023ac5c4d2b8f07716a7f3dcc8ea Mon Sep 17 00:00:00 2001 From: Tiezhu Yang Date: Fri, 31 Mar 2023 17:15:51 +0800 Subject: module: Sync code of is_arm_mapping_symbol() After commit 2e3a10a1551d ("ARM: avoid ARM binutils leaking ELF local symbols") and commit d6b732666a1b ("modpost: fix undefined behavior of is_arm_mapping_symbol()"), many differences of is_arm_mapping_symbol() exist in kernel/module/kallsyms.c and scripts/mod/modpost.c, just sync the code to keep consistent. Signed-off-by: Tiezhu Yang Signed-off-by: Luis Chamberlain --- scripts/mod/modpost.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'scripts/mod') diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index efff8078e395..79a27cc5f0b1 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1114,6 +1114,8 @@ static int secref_whitelist(const struct sectioncheck *mismatch, static inline int is_arm_mapping_symbol(const char *str) { + if (str[0] == '.' && str[1] == 'L') + return true; return str[0] == '$' && (str[1] == 'a' || str[1] == 'd' || str[1] == 't' || str[1] == 'x') && (str[2] == '\0' || str[2] == '.'); -- cgit v1.2.3 From 987d2e0aaa55de40938435be760aa96428470fd6 Mon Sep 17 00:00:00 2001 From: Tiezhu Yang Date: Fri, 31 Mar 2023 17:15:52 +0800 Subject: module: Move is_arm_mapping_symbol() to module_symbol.h In order to avoid duplicated code, move is_arm_mapping_symbol() to include/linux/module_symbol.h, then remove is_arm_mapping_symbol() in the other places. Signed-off-by: Tiezhu Yang Signed-off-by: Luis Chamberlain --- scripts/mod/modpost.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) (limited to 'scripts/mod') diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 79a27cc5f0b1..7241db81ffde 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -22,6 +22,7 @@ #include #include "modpost.h" #include "../../include/linux/license.h" +#include "../../include/linux/module_symbol.h" /* Are we using CONFIG_MODVERSIONS? */ static bool modversions; @@ -1112,15 +1113,6 @@ static int secref_whitelist(const struct sectioncheck *mismatch, return 1; } -static inline int is_arm_mapping_symbol(const char *str) -{ - if (str[0] == '.' && str[1] == 'L') - return true; - return str[0] == '$' && - (str[1] == 'a' || str[1] == 'd' || str[1] == 't' || str[1] == 'x') - && (str[2] == '\0' || str[2] == '.'); -} - /* * If there's no name there, ignore it; likewise, ignore it if it's * one of the magic symbols emitted used by current ARM tools. -- cgit v1.2.3 From 0a3bf86092c38f7b72c56c6901c78dd302411307 Mon Sep 17 00:00:00 2001 From: Tiezhu Yang Date: Fri, 31 Mar 2023 17:15:53 +0800 Subject: module: Ignore L0 and rename is_arm_mapping_symbol() The L0 symbol is generated when build module on LoongArch, ignore it in modpost and when looking at module symbols, otherwise we can not see the expected call trace. Now is_arm_mapping_symbol() is not only for ARM, in order to reflect the reality, rename is_arm_mapping_symbol() to is_mapping_symbol(). This is related with commit c17a2538704f ("mksysmap: Fix the mismatch of 'L0' symbols in System.map"). (1) Simple test case [loongson@linux hello]$ cat hello.c #include #include #include static void test_func(void) { pr_info("This is a test\n"); dump_stack(); } static int __init hello_init(void) { pr_warn("Hello, world\n"); test_func(); return 0; } static void __exit hello_exit(void) { pr_warn("Goodbye\n"); } module_init(hello_init); module_exit(hello_exit); MODULE_LICENSE("GPL"); [loongson@linux hello]$ cat Makefile obj-m:=hello.o ccflags-y += -g -Og all: make -C /lib/modules/$(shell uname -r)/build/ M=$(PWD) modules clean: make -C /lib/modules/$(shell uname -r)/build/ M=$(PWD) clean (2) Test environment system: LoongArch CLFS 5.5 https://github.com/sunhaiyong1978/CLFS-for-LoongArch/releases/tag/5.0 It needs to update grub to avoid booting error "invalid magic number". kernel: 6.3-rc1 with loongson3_defconfig + CONFIG_DYNAMIC_FTRACE=y (3) Test result Without this patch: [root@linux hello]# insmod hello.ko [root@linux hello]# dmesg ... Hello, world This is a test ... Call Trace: [<9000000000223728>] show_stack+0x68/0x18c [<90000000013374cc>] dump_stack_lvl+0x60/0x88 [] L0\x01+0x20/0x2c [hello] [] L0\x01+0x20/0x30 [hello] [<900000000022097c>] do_one_initcall+0x88/0x288 [<90000000002df890>] do_init_module+0x54/0x200 [<90000000002e1e18>] __do_sys_finit_module+0xc4/0x114 [<90000000013382e8>] do_syscall+0x7c/0x94 [<9000000000221e3c>] handle_syscall+0xbc/0x158 With this patch: [root@linux hello]# insmod hello.ko [root@linux hello]# dmesg ... Hello, world This is a test ... Call Trace: [<9000000000223728>] show_stack+0x68/0x18c [<90000000013374cc>] dump_stack_lvl+0x60/0x88 [] test_func+0x28/0x34 [hello] [] hello_init+0x28/0x38 [hello] [<900000000022097c>] do_one_initcall+0x88/0x288 [<90000000002df890>] do_init_module+0x54/0x200 [<90000000002e1e18>] __do_sys_finit_module+0xc4/0x114 [<90000000013382e8>] do_syscall+0x7c/0x94 [<9000000000221e3c>] handle_syscall+0xbc/0x158 Signed-off-by: Tiezhu Yang Tested-by: Youling Tang # for LoongArch Signed-off-by: Luis Chamberlain --- scripts/mod/modpost.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'scripts/mod') diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 7241db81ffde..5cddf7623945 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1115,7 +1115,7 @@ static int secref_whitelist(const struct sectioncheck *mismatch, /* * If there's no name there, ignore it; likewise, ignore it if it's - * one of the magic symbols emitted used by current ARM tools. + * one of the magic symbols emitted used by current tools. * * Otherwise if find_symbols_between() returns those symbols, they'll * fail the whitelist tests and cause lots of false alarms ... fixable @@ -1128,7 +1128,7 @@ static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) if (!name || !strlen(name)) return 0; - return !is_arm_mapping_symbol(name); + return !is_mapping_symbol(name); } /** -- cgit v1.2.3