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Merge pull request #20413 from poettering/mempmen

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add and use mempmem_safe()
This commit is contained in:
Luca Boccassi 2021-08-10 20:31:36 +01:00 committed by GitHub
commit 06e8d75a5d
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4 changed files with 24 additions and 14 deletions
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10
src/basic/memory-util.h
View File

@ -71,6 +71,16 @@ static inline void *memmem_safe(const void *haystack, size_t haystacklen, const
return memmem(haystack, haystacklen, needle, needlelen);
}
static inline void *mempmem_safe(const void *haystack, size_t haystacklen, const void *needle, size_t needlelen) {
const uint8_t *p;
p = memmem_safe(haystack, haystacklen, needle, needlelen);
if (!p)
return NULL;
return (uint8_t*) p + needlelen;
}
#if HAVE_EXPLICIT_BZERO
static inline void* explicit_bzero_safe(void *p, size_t l) {
if (l > 0)

5
src/boot/bootctl.c
View File

@ -159,12 +159,11 @@ static int get_file_version(int fd, char **v) {
if (buf == MAP_FAILED)
return log_error_errno(errno, "Failed to memory map EFI binary: %m");
s = memmem(buf, st.st_size - 8, "#### LoaderInfo: ", 17);
s = mempmem_safe(buf, st.st_size - 8, "#### LoaderInfo: ", 17);
if (!s)
goto finish;
s += 17;
e = memmem(s, st.st_size - (s - buf), " ####", 5);
e = memmem_safe(s, st.st_size - (s - buf), " ####", 5);
if (!e || e - s < 3) {
r = log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Malformed version string.");
goto finish;

5
src/import/pull-common.c
View File

@ -10,6 +10,7 @@
#include "escape.h"
#include "fd-util.h"
#include "io-util.h"
#include "memory-util.h"
#include "path-util.h"
#include "process-util.h"
#include "pull-common.h"
@ -342,7 +343,7 @@ static int verify_one(PullJob *checksum_job, PullJob *job) {
line = strjoina(job->checksum, " *", fn, "\n");
p = memmem(checksum_job->payload,
p = memmem_safe(checksum_job->payload,
checksum_job->payload_size,
line,
strlen(line));
@ -350,7 +351,7 @@ static int verify_one(PullJob *checksum_job, PullJob *job) {
if (!p) {
line = strjoina(job->checksum, " ", fn, "\n");
p = memmem(checksum_job->payload,
p = memmem_safe(checksum_job->payload,
checksum_job->payload_size,
line,
strlen(line));

6
src/libsystemd/sd-bus/bus-socket.c
View File

@ -173,12 +173,12 @@ static int bus_socket_auth_verify_client(sd_bus *b) {
if (!d)
return 0;
e = memmem(d + 2, b->rbuffer_size - (d - (char*) b->rbuffer) - 2, "\r\n", 2);
e = memmem_safe(d + 2, b->rbuffer_size - (d - (char*) b->rbuffer) - 2, "\r\n", 2);
if (!e)
return 0;
if (b->accept_fd) {
f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2);
f = memmem_safe(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2);
if (!f)
return 0;
@ -399,7 +399,7 @@ static int bus_socket_auth_verify_server(sd_bus *b) {
for (;;) {
/* Check if line is complete */
line = (char*) b->rbuffer + b->auth_rbegin;
e = memmem(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2);
e = memmem_safe(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2);
if (!e)
return processed;