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kallsyms: add support for relative offsets in kallsyms address table

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Similar to how relative extables are implemented, it is possible to emit
the kallsyms table in such a way that it contains offsets relative to
some anchor point in the kernel image rather than absolute addresses.

On 64-bit architectures, it cuts the size of the kallsyms address table
in half, since offsets between kernel symbols can typically be expressed
in 32 bits.  This saves several hundreds of kilobytes of permanent
.rodata on average.  In addition, the kallsyms address table is no
longer subject to dynamic relocation when CONFIG_RELOCATABLE is in
effect, so the relocation work done after decompression now doesn't have
to do relocation updates for all these values.  This saves up to 24
bytes (i.e., the size of a ELF64 RELA relocation table entry) per value,
which easily adds up to a couple of megabytes of uncompressed __init
data on ppc64 or arm64.  Even if these relocation entries typically
compress well, the combined size reduction of 2.8 MB uncompressed for a
ppc64_defconfig build (of which 2.4 MB is __init data) results in a ~500
KB space saving in the compressed image.

Since it is useful for some architectures (like x86) to retain the
ability to emit absolute values as well, this patch also adds support
for capturing both absolute and relative values when
KALLSYMS_ABSOLUTE_PERCPU is in effect, by emitting absolute per-cpu
addresses as positive 32-bit values, and addresses relative to the
lowest encountered relative symbol as negative values, which are
subtracted from the runtime address of this base symbol to produce the
actual address.

Support for the above is enabled by default for all architectures except
IA-64 and Tile-GX, whose symbols are too far apart to capture in this
manner.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Kees Cook <keescook@chromium.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ard Biesheuvel 2016-03-15 14:58:19 -07:00 committed by Linus Torvalds
parent 8c996940b3
commit 2213e9a66b
5 changed files with 126 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
init/Kconfig
View file

@ -1424,6 +1424,24 @@ config KALLSYMS_ABSOLUTE_PERCPU
bool
default X86_64 && SMP
config KALLSYMS_BASE_RELATIVE
bool
depends on KALLSYMS
default !IA64 && !(TILE && 64BIT)
help
Instead of emitting them as absolute values in the native word size,
emit the symbol references in the kallsyms table as 32-bit entries,
each containing a relative value in the range [base, base + U32_MAX]
or, when KALLSYMS_ABSOLUTE_PERCPU is in effect, each containing either
an absolute value in the range [0, S32_MAX] or a relative value in the
range [base, base + S32_MAX], where base is the lowest relative symbol
address encountered in the image.
On 64-bit builds, this reduces the size of the address table by 50%,
but more importantly, it results in entries whose values are build
time constants, and no relocation pass is required at runtime to fix
up the entries based on the runtime load address of the kernel.
config PRINTK
default y
bool "Enable support for printk" if EXPERT

42
kernel/kallsyms.c
View file

@ -38,6 +38,7 @@
* during the second link stage.
*/
extern const unsigned long kallsyms_addresses[] __weak;
extern const int kallsyms_offsets[] __weak;
extern const u8 kallsyms_names[] __weak;
/*
@ -47,6 +48,9 @@ extern const u8 kallsyms_names[] __weak;
extern const unsigned long kallsyms_num_syms
__attribute__((weak, section(".rodata")));
extern const unsigned long kallsyms_relative_base
__attribute__((weak, section(".rodata")));
extern const u8 kallsyms_token_table[] __weak;
extern const u16 kallsyms_token_index[] __weak;
@ -176,6 +180,23 @@ static unsigned int get_symbol_offset(unsigned long pos)
return name - kallsyms_names;
}
static unsigned long kallsyms_sym_address(int idx)
{
if (!IS_ENABLED(CONFIG_KALLSYMS_BASE_RELATIVE))
return kallsyms_addresses[idx];
/* values are unsigned offsets if --absolute-percpu is not in effect */
if (!IS_ENABLED(CONFIG_KALLSYMS_ABSOLUTE_PERCPU))
return kallsyms_relative_base + (u32)kallsyms_offsets[idx];
/* ...otherwise, positive offsets are absolute values */
if (kallsyms_offsets[idx] >= 0)
return kallsyms_offsets[idx];
/* ...and negative offsets are relative to kallsyms_relative_base - 1 */
return kallsyms_relative_base - 1 - kallsyms_offsets[idx];
}
/* Lookup the address for this symbol. Returns 0 if not found. */
unsigned long kallsyms_lookup_name(const char *name)
{
@ -187,7 +208,7 @@ unsigned long kallsyms_lookup_name(const char *name)
off = kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf));
if (strcmp(namebuf, name) == 0)
return kallsyms_addresses[i];
return kallsyms_sym_address(i);
}
return module_kallsyms_lookup_name(name);
}
@ -204,7 +225,7 @@ int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
off = kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf));
ret = fn(data, namebuf, NULL, kallsyms_addresses[i]);
ret = fn(data, namebuf, NULL, kallsyms_sym_address(i));
if (ret != 0)
return ret;
}
@ -220,7 +241,10 @@ static unsigned long get_symbol_pos(unsigned long addr,
unsigned long i, low, high, mid;
/* This kernel should never had been booted. */
BUG_ON(!kallsyms_addresses);
if (!IS_ENABLED(CONFIG_KALLSYMS_BASE_RELATIVE))
BUG_ON(!kallsyms_addresses);
else
BUG_ON(!kallsyms_offsets);
/* Do a binary search on the sorted kallsyms_addresses array. */
low = 0;
@ -228,7 +252,7 @@ static unsigned long get_symbol_pos(unsigned long addr,
while (high - low > 1) {
mid = low + (high - low) / 2;
if (kallsyms_addresses[mid] <= addr)
if (kallsyms_sym_address(mid) <= addr)
low = mid;
else
high = mid;
@ -238,15 +262,15 @@ static unsigned long get_symbol_pos(unsigned long addr,
* Search for the first aliased symbol. Aliased
* symbols are symbols with the same address.
*/
while (low && kallsyms_addresses[low-1] == kallsyms_addresses[low])
while (low && kallsyms_sym_address(low-1) == kallsyms_sym_address(low))
--low;
symbol_start = kallsyms_addresses[low];
symbol_start = kallsyms_sym_address(low);
/* Search for next non-aliased symbol. */
for (i = low + 1; i < kallsyms_num_syms; i++) {
if (kallsyms_addresses[i] > symbol_start) {
symbol_end = kallsyms_addresses[i];
if (kallsyms_sym_address(i) > symbol_start) {
symbol_end = kallsyms_sym_address(i);
break;
}
}
@ -470,7 +494,7 @@ static unsigned long get_ksymbol_core(struct kallsym_iter *iter)
unsigned off = iter->nameoff;
iter->module_name[0] = '\0';
iter->value = kallsyms_addresses[iter->pos];
iter->value = kallsyms_sym_address(iter->pos);
iter->type = kallsyms_get_symbol_type(off);

79
scripts/kallsyms.c
View file

@ -22,6 +22,7 @@
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
@ -43,6 +44,7 @@ struct addr_range {
};
static unsigned long long _text;
static unsigned long long relative_base;
static struct addr_range text_ranges[] = {
{ "_stext", "_etext" },
{ "_sinittext", "_einittext" },
@ -62,6 +64,7 @@ static int all_symbols = 0;
static int absolute_percpu = 0;
static char symbol_prefix_char = '\0';
static unsigned long long kernel_start_addr = 0;
static int base_relative = 0;
int token_profit[0x10000];
@ -75,7 +78,7 @@ static void usage(void)
fprintf(stderr, "Usage: kallsyms [--all-symbols] "
"[--symbol-prefix=<prefix char>] "
"[--page-offset=<CONFIG_PAGE_OFFSET>] "
"< in.map > out.S\n");
"[--base-relative] < in.map > out.S\n");
exit(1);
}
@ -205,6 +208,8 @@ static int symbol_valid(struct sym_entry *s)
*/
static char *special_symbols[] = {
"kallsyms_addresses",
"kallsyms_offsets",
"kallsyms_relative_base",
"kallsyms_num_syms",
"kallsyms_names",
"kallsyms_markers",
@ -349,16 +354,48 @@ static void write_src(void)
printf("\t.section .rodata, \"a\"\n");
/* Provide proper symbols relocatability by their '_text'
* relativeness. The symbol names cannot be used to construct
* normal symbol references as the list of symbols contains
* symbols that are declared static and are private to their
* .o files. This prevents .tmp_kallsyms.o or any other
* object from referencing them.
/* Provide proper symbols relocatability by their relativeness
* to a fixed anchor point in the runtime image, either '_text'
* for absolute address tables, in which case the linker will
* emit the final addresses at build time. Otherwise, use the
* offset relative to the lowest value encountered of all relative
* symbols, and emit non-relocatable fixed offsets that will be fixed
* up at runtime.
*
* The symbol names cannot be used to construct normal symbol
* references as the list of symbols contains symbols that are
* declared static and are private to their .o files. This prevents
* .tmp_kallsyms.o or any other object from referencing them.
*/
output_label("kallsyms_addresses");
if (!base_relative)
output_label("kallsyms_addresses");
else
output_label("kallsyms_offsets");
for (i = 0; i < table_cnt; i++) {
if (!symbol_absolute(&table[i])) {
if (base_relative) {
long long offset;
int overflow;
if (!absolute_percpu) {
offset = table[i].addr - relative_base;
overflow = (offset < 0 || offset > UINT_MAX);
} else if (symbol_absolute(&table[i])) {
offset = table[i].addr;
overflow = (offset < 0 || offset > INT_MAX);
} else {
offset = relative_base - table[i].addr - 1;
overflow = (offset < INT_MIN || offset >= 0);
}
if (overflow) {
fprintf(stderr, "kallsyms failure: "
"%s symbol value %#llx out of range in relative mode\n",
symbol_absolute(&table[i]) ? "absolute" : "relative",
table[i].addr);
exit(EXIT_FAILURE);
}
printf("\t.long\t%#x\n", (int)offset);
} else if (!symbol_absolute(&table[i])) {
if (_text <= table[i].addr)
printf("\tPTR\t_text + %#llx\n",
table[i].addr - _text);
@ -371,6 +408,12 @@ static void write_src(void)
}
printf("\n");
if (base_relative) {
output_label("kallsyms_relative_base");
printf("\tPTR\t_text - %#llx\n", _text - relative_base);
printf("\n");
}
output_label("kallsyms_num_syms");
printf("\tPTR\t%d\n", table_cnt);
printf("\n");
@ -695,6 +738,18 @@ static void make_percpus_absolute(void)
}
}
/* find the minimum non-absolute symbol address */
static void record_relative_base(void)
{
unsigned int i;
relative_base = -1ULL;
for (i = 0; i < table_cnt; i++)
if (!symbol_absolute(&table[i]) &&
table[i].addr < relative_base)
relative_base = table[i].addr;
}
int main(int argc, char **argv)
{
if (argc >= 2) {
@ -713,7 +768,9 @@ int main(int argc, char **argv)
} else if (strncmp(argv[i], "--page-offset=", 14) == 0) {
const char *p = &argv[i][14];
kernel_start_addr = strtoull(p, NULL, 16);
} else
} else if (strcmp(argv[i], "--base-relative") == 0)
base_relative = 1;
else
usage();
}
} else if (argc != 1)
@ -722,6 +779,8 @@ int main(int argc, char **argv)
read_map(stdin);
if (absolute_percpu)
make_percpus_absolute();
if (base_relative)
record_relative_base();
sort_symbols();
optimize_token_table();
write_src();

4
scripts/link-vmlinux.sh
View file

@ -90,6 +90,10 @@ kallsyms()
kallsymopt="${kallsymopt} --absolute-percpu"
fi
if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then
kallsymopt="${kallsymopt} --base-relative"
fi
local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"

2
scripts/namespace.pl
View file

@ -117,6 +117,8 @@ my %nameexception = (
'kallsyms_names' => 1,
'kallsyms_num_syms' => 1,
'kallsyms_addresses'=> 1,
'kallsyms_offsets' => 1,
'kallsyms_relative_base'=> 1,
'__this_module' => 1,
'_etext' => 1,
'_edata' => 1,