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Code Issues Releases Wiki Activity

caps: ensure \0-termination

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Fixes: Coverity 1492865
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner
2021-10-15 11:29:27 +02:00
parent bf2af3e72a
commit a031a4e14f
2 changed files with 20 additions and 4 deletions
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8
src/lxc/caps.c
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@@ -228,11 +228,11 @@ static int __caps_last_cap(__u32 *cap)
if (fd >= 0) {
ssize_t ret;
unsigned int res;
char buf[INTTYPE_TO_STRLEN(unsigned int)] = {0};
char buf[INTTYPE_TO_STRLEN(unsigned int)];
ret = lxc_read_nointr(fd, buf, STRARRAYLEN(buf));
if (ret <= 0)
return syserror_set(EINVAL, "Failed to read \"/proc/sys/kernel/cap_last_cap\"");
ret = lxc_read_string_nointr(fd, buf, STRARRAYLEN(buf));
if (ret)
return syserror("Failed to read \"/proc/sys/kernel/cap_last_cap\"");
ret = lxc_safe_uint(lxc_trim_whitespace_in_place(buf), &res);
if (ret < 0)

16
src/lxc/file_utils.h
View File

@@ -45,6 +45,22 @@ __hidden extern ssize_t lxc_send_nointr(int sockfd, void *buf, size_t len, int f
__hidden extern ssize_t lxc_read_nointr(int fd, void *buf, size_t count) __access_w(2, 3);
__access_w(2, 3) static inline int lxc_read_string_nointr(int fd, char *buf,
size_t count)
{
ssize_t ret;
ret = lxc_read_nointr(fd, buf, STRARRAYLEN(buf));
if (ret < 0)
return -errno;
if (ret == 0)
return ret_errno(ENODATA);
if ((size_t)ret >= sizeof(buf))
return ret_errno(E2BIG);
buf[ret] = '\0';
return 0;
}
__hidden extern ssize_t lxc_read_nointr_expect(int fd, void *buf, size_t count,
const void *expected_buf) __access_w(2, 3);