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kallsyms: Do not cleanup .llvm.<hash> suffix before sorting symbols

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Cleaning up the symbols causes various issues afterwards. Let's sort
the list based on original name.

Signed-off-by: Song Liu <song@kernel.org>
Fixes: 8cc32a9bbf ("kallsyms: strip LTO-only suffixes from promoted global functions")
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Tested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20240807220513.3100483-2-song@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Song Liu 2024-08-07 15:05:12 -07:00 committed by Kees Cook
parent 92e9bac181
commit 020925ce92
2 changed files with 2 additions and 33 deletions
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31
scripts/kallsyms.c
View File

@ -5,8 +5,7 @@
* This software may be used and distributed according to the terms * This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference. * of the GNU General Public License, incorporated herein by reference.
* *
* Usage: kallsyms [--all-symbols] [--absolute-percpu] * Usage: kallsyms [--all-symbols] [--absolute-percpu] in.map > out.S
* [--lto-clang] in.map > out.S
* *
* Table compression uses all the unused char codes on the symbols and * Table compression uses all the unused char codes on the symbols and
* maps these to the most used substrings (tokens). For instance, it might * maps these to the most used substrings (tokens). For instance, it might
@ -62,7 +61,6 @@ static struct sym_entry **table;
static unsigned int table_size, table_cnt; static unsigned int table_size, table_cnt;
static int all_symbols; static int all_symbols;
static int absolute_percpu; static int absolute_percpu;
static int lto_clang;
static int token_profit[0x10000]; static int token_profit[0x10000];
@ -73,8 +71,7 @@ static unsigned char best_table_len[256];
static void usage(void) static void usage(void)
{ {
fprintf(stderr, "Usage: kallsyms [--all-symbols] [--absolute-percpu] " fprintf(stderr, "Usage: kallsyms [--all-symbols] [--absolute-percpu] in.map > out.S\n");
"[--lto-clang] in.map > out.S\n");
exit(1); exit(1);
} }
@ -344,25 +341,6 @@ static bool symbol_absolute(const struct sym_entry *s)
return s->percpu_absolute; return s->percpu_absolute;
} }
static void cleanup_symbol_name(char *s)
{
char *p;
/*
* ASCII[.] = 2e
* ASCII[0-9] = 30,39
* ASCII[A-Z] = 41,5a
* ASCII[_] = 5f
* ASCII[a-z] = 61,7a
*
* As above, replacing the first '.' in ".llvm." with '\0' does not
* affect the main sorting, but it helps us with subsorting.
*/
p = strstr(s, ".llvm.");
if (p)
*p = '\0';
}
static int compare_names(const void *a, const void *b) static int compare_names(const void *a, const void *b)
{ {
int ret; int ret;
@ -526,10 +504,6 @@ static void write_src(void)
output_address(relative_base); output_address(relative_base);
printf("\n"); printf("\n");
if (lto_clang)
for (i = 0; i < table_cnt; i++)
cleanup_symbol_name((char *)table[i]->sym);
sort_symbols_by_name(); sort_symbols_by_name();
output_label("kallsyms_seqs_of_names"); output_label("kallsyms_seqs_of_names");
for (i = 0; i < table_cnt; i++) for (i = 0; i < table_cnt; i++)
@ -807,7 +781,6 @@ int main(int argc, char **argv)
static const struct option long_options[] = { static const struct option long_options[] = {
{"all-symbols", no_argument, &all_symbols, 1}, {"all-symbols", no_argument, &all_symbols, 1},
{"absolute-percpu", no_argument, &absolute_percpu, 1}, {"absolute-percpu", no_argument, &absolute_percpu, 1},
{"lto-clang", no_argument, &lto_clang, 1},
{}, {},
}; };

4
scripts/link-vmlinux.sh
View File

@ -156,10 +156,6 @@ kallsyms()
kallsymopt="${kallsymopt} --absolute-percpu" kallsymopt="${kallsymopt} --absolute-percpu"
fi fi
if is_enabled CONFIG_LTO_CLANG; then
kallsymopt="${kallsymopt} --lto-clang"
fi
info KSYMS "${2}.S" info KSYMS "${2}.S"
scripts/kallsyms ${kallsymopt} "${1}" > "${2}.S" scripts/kallsyms ${kallsymopt} "${1}" > "${2}.S"