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ima-evm-utils: Fix file2bin stat and fopen relations

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Check stat(2) return value, use fstat(2) to avoid race between
stat() and fopen(), remove now unused get_filesize().

Fixes: CID 229889.
Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Vitaly Chikunov 2019-07-15 23:05:52 +03:00 committed by Mimi Zohar
parent 9d52489bd3
commit 08a51e7460
3 changed files with 21 additions and 14 deletions
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26
src/evmctl.c
View File

@ -175,9 +175,10 @@ static int bin2file(const char *file, const char *ext, const unsigned char *data
static unsigned char *file2bin(const char *file, const char *ext, int *size)
{
FILE *fp;
int len;
size_t len;
unsigned char *data;
char name[strlen(file) + (ext ? strlen(ext) : 0) + 2];
struct stat stats;
if (ext)
sprintf(name, "%s.%s", file, ext);
@ -186,18 +187,33 @@ static unsigned char *file2bin(const char *file, const char *ext, int *size)
log_info("Reading to %s\n", name);
len = get_filesize(name);
fp = fopen(name, "r");
if (!fp) {
log_err("Failed to open: %s\n", name);
return NULL;
}
if (fstat(fileno(fp), &stats) == -1) {
log_err("Failed to fstat: %s (%s)\n", name, strerror(errno));
fclose(fp);
return NULL;
}
len = stats.st_size;
data = malloc(len);
if (!fread(data, len, 1, fp))
len = 0;
if (!data) {
log_err("Failed to malloc %zu bytes: %s\n", len, name);
fclose(fp);
return NULL;
}
if (fread(data, len, 1, fp) != len) {
log_err("Failed to fread %zu bytes: %s\n", len, name);
fclose(fp);
free(data);
return NULL;
}
fclose(fp);
*size = len;
*size = (int)len;
return data;
}

1
src/imaevm.h
View File

@ -211,7 +211,6 @@ extern struct libevm_params params;
void do_dump(FILE *fp, const void *ptr, int len, bool cr);
void dump(const void *ptr, int len);
int get_filesize(const char *filename);
int ima_calc_hash(const char *file, uint8_t *hash);
int get_hash_algo(const char *algo);
RSA *read_pub_key(const char *keyfile, int x509);

8
src/libimaevm.c
View File

@ -116,14 +116,6 @@ const char *get_hash_algo_by_id(int algo)
return "unknown";
}
int get_filesize(const char *filename)
{
struct stat stats;
/* Need to know the file length */
stat(filename, &stats);
return (int)stats.st_size;
}
static inline off_t get_fdsize(int fd)
{
struct stat stats;