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util/cbmem: Use commonlib ipchksum() algorithm

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This patch switches the cbmem utility from its own IP checksum
implementation to the commonlib version (which is good because the old
one had a couple of bugs: doesn't work on odd sizes and may overflow
its carry accumulator with input larger than 64K).

Change-Id: I0bef2c85c37ddd3438b7ac6389e9daa3e4955b31
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80256
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Julius Werner
2024-01-30 19:33:40 -08:00
parent f6e358483b
commit c228beff19
2 changed files with 6 additions and 23 deletions
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5
util/cbmem/Makefile
View File

@ -4,6 +4,7 @@
PROGRAM = cbmem
TOP ?= $(abspath ../..)
ROOT = $(TOP)/src
COMMONLIB = $(ROOT)/commonlib
CC ?= $(CROSS_COMPILE)gcc
INSTALL ?= /usr/bin/env install
PREFIX ?= /usr/local
@ -13,14 +14,14 @@ CFLAGS += -Wall -Wextra -Wmissing-prototypes -Wshadow $(WERROR)
CPPFLAGS += -I . -I $(ROOT)/commonlib/include -I $(ROOT)/commonlib/bsd/include
CPPFLAGS += -include $(ROOT)/commonlib/bsd/include/commonlib/bsd/compiler.h
OBJS = $(PROGRAM).o
OBJS = $(PROGRAM).o $(COMMONLIB)/bsd/ipchksum.o
all: $(PROGRAM)
$(PROGRAM): $(OBJS)
clean:
rm -f $(PROGRAM) *.o .dependencies *~ junit.xml
rm -f $(PROGRAM) $(OBJS:.c=.o) .dependencies *~ junit.xml
install: $(PROGRAM)
$(INSTALL) -d $(DESTDIR)$(PREFIX)/sbin/

24
util/cbmem/cbmem.c
View File

@ -19,6 +19,7 @@
#include <assert.h>
#include <regex.h>
#include <commonlib/bsd/cbmem_id.h>
#include <commonlib/bsd/ipchksum.h>
#include <commonlib/bsd/tpm_log_defs.h>
#include <commonlib/loglevel.h>
#include <commonlib/timestamp_serialized.h>
@ -199,25 +200,6 @@ static void *aligned_memcpy(void *dest, const void *src, size_t n)
return dest;
}
/*
* calculate ip checksum (16 bit quantities) on a passed in buffer. In case
* the buffer length is odd last byte is excluded from the calculation
*/
static u16 ipchcksum(const void *addr, unsigned size)
{
const u16 *p = addr;
unsigned i, n = size / 2; /* don't expect odd sized blocks */
u32 sum = 0;
for (i = 0; i < n; i++)
sum += p[i];
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
sum = ~sum & 0xffff;
return (u16) sum;
}
/* Find the first cbmem entry filling in the details. */
static int find_cbmem_entry(uint32_t id, uint64_t *addr, size_t *size)
{
@ -400,7 +382,7 @@ static int parse_cbtable(u64 address, size_t table_size)
lbh = buf + i;
if (memcmp(lbh->signature, "LBIO", sizeof(lbh->signature)) ||
!lbh->header_bytes ||
ipchcksum(lbh, sizeof(*lbh))) {
ipchksum(lbh, sizeof(*lbh))) {
continue;
}
@ -411,7 +393,7 @@ static int parse_cbtable(u64 address, size_t table_size)
continue;
}
if (ipchcksum(mapping_virt(&table_mapping), lbh->table_bytes) !=
if (ipchksum(mapping_virt(&table_mapping), lbh->table_bytes) !=
lbh->table_checksum) {
debug("Signature found, but wrong checksum.\n");
unmap_memory(&table_mapping);