msghdr: change cmsghdr size types from size_t to unsigned int
As the kernel does not accept control messages longer than the value of int sysctl_optmem_max kernel variable exported as /proc/sys/net/core/optmem_max, we do not print them either. Since unsigned int has enough room to contain any valid control message size, change all internal cmsghdr size types from size_t to unsigned int. * msghdr.c (print_scm_rights, print_scm_creds, print_scm_security, print_cmsg_ip_pktinfo, print_cmsg_uint, print_cmsg_uint8_t, print_cmsg_ip_opts, print_cmsg_ip_recverr, print_cmsg_ip_origdstaddr, cmsg_printer, print_cmsg_type_data): Change data_len argument type from size_t to unsigned int. (cmsg_socket_printers): Change min_len type from size_t to unsigned int. (decode_msg_control): Change the type of in_control_len argument, cmsg_len, and len variables from size_t to kernel_ureg_t. Change the type of cmsg_size, control_len, and buf_len variables from size_t to unsigned int.
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121e148978
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27cc81d61f
52
msghdr.c
52
msghdr.c
@ -56,11 +56,12 @@ typedef union {
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} union_cmsghdr;
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static void
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print_scm_rights(struct tcb *tcp, const void *cmsg_data, const size_t data_len)
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print_scm_rights(struct tcb *tcp, const void *cmsg_data,
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const unsigned int data_len)
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{
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const int *fds = cmsg_data;
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const size_t nfds = data_len / sizeof(*fds);
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size_t i;
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const unsigned int nfds = data_len / sizeof(*fds);
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unsigned int i;
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tprints("[");
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@ -78,7 +79,8 @@ print_scm_rights(struct tcb *tcp, const void *cmsg_data, const size_t data_len)
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}
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static void
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print_scm_creds(struct tcb *tcp, const void *cmsg_data, const size_t data_len)
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print_scm_creds(struct tcb *tcp, const void *cmsg_data,
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const unsigned int data_len)
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{
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const struct ucred *uc = cmsg_data;
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@ -88,14 +90,14 @@ print_scm_creds(struct tcb *tcp, const void *cmsg_data, const size_t data_len)
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static void
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print_scm_security(struct tcb *tcp, const void *cmsg_data,
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const size_t data_len)
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const unsigned int data_len)
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{
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print_quoted_string(cmsg_data, data_len, 0);
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}
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static void
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print_cmsg_ip_pktinfo(struct tcb *tcp, const void *cmsg_data,
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const size_t data_len)
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const unsigned int data_len)
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{
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const struct in_pktinfo *info = cmsg_data;
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@ -108,7 +110,8 @@ print_cmsg_ip_pktinfo(struct tcb *tcp, const void *cmsg_data,
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}
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static void
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print_cmsg_uint(struct tcb *tcp, const void *cmsg_data, const size_t data_len)
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print_cmsg_uint(struct tcb *tcp, const void *cmsg_data,
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const unsigned int data_len)
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{
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const unsigned int *p = cmsg_data;
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@ -117,7 +120,7 @@ print_cmsg_uint(struct tcb *tcp, const void *cmsg_data, const size_t data_len)
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static void
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print_cmsg_uint8_t(struct tcb *tcp, const void *cmsg_data,
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const size_t data_len)
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const unsigned int data_len)
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{
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const uint8_t *p = cmsg_data;
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@ -126,10 +129,10 @@ print_cmsg_uint8_t(struct tcb *tcp, const void *cmsg_data,
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static void
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print_cmsg_ip_opts(struct tcb *tcp, const void *cmsg_data,
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const size_t data_len)
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const unsigned int data_len)
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{
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const unsigned char *opts = cmsg_data;
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size_t i;
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unsigned int i;
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tprints("[");
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for (i = 0; i < data_len; ++i) {
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@ -157,7 +160,7 @@ struct sock_ee {
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static void
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print_cmsg_ip_recverr(struct tcb *tcp, const void *cmsg_data,
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const size_t data_len)
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const unsigned int data_len)
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{
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const struct sock_ee *const err = cmsg_data;
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@ -171,20 +174,20 @@ print_cmsg_ip_recverr(struct tcb *tcp, const void *cmsg_data,
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static void
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print_cmsg_ip_origdstaddr(struct tcb *tcp, const void *cmsg_data,
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const size_t data_len)
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const unsigned int data_len)
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{
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const int addr_len =
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const unsigned int addr_len =
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data_len > sizeof(struct sockaddr_storage)
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? sizeof(struct sockaddr_storage) : data_len;
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print_sockaddr(tcp, cmsg_data, addr_len);
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}
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typedef void (* const cmsg_printer)(struct tcb *, const void *, size_t);
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typedef void (* const cmsg_printer)(struct tcb *, const void *, unsigned int);
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static const struct {
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const cmsg_printer printer;
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const size_t min_len;
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const unsigned int min_len;
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} cmsg_socket_printers[] = {
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[SCM_RIGHTS] = { print_scm_rights, sizeof(int) },
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[SCM_CREDENTIALS] = { print_scm_creds, sizeof(struct ucred) },
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@ -203,7 +206,7 @@ static const struct {
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static void
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print_cmsg_type_data(struct tcb *tcp, const int cmsg_level, const int cmsg_type,
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const void *cmsg_data, const size_t data_len)
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const void *cmsg_data, const unsigned int data_len)
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{
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const unsigned int utype = cmsg_type;
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switch (cmsg_level) {
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@ -250,22 +253,21 @@ get_optmem_max(void)
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static void
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decode_msg_control(struct tcb *const tcp, const kernel_ureg_t addr,
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const size_t in_control_len)
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const kernel_ureg_t in_control_len)
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{
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if (!in_control_len)
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return;
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tprints(", msg_control=");
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const size_t cmsg_size =
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const unsigned int cmsg_size =
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#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
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(current_wordsize < sizeof(long)) ? sizeof(struct cmsghdr32) :
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#endif
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sizeof(struct cmsghdr);
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size_t control_len =
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in_control_len > get_optmem_max()
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? get_optmem_max() : in_control_len;
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size_t buf_len = control_len;
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unsigned int control_len = in_control_len > get_optmem_max()
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? get_optmem_max() : in_control_len;
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unsigned int buf_len = control_len;
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char *buf = buf_len < cmsg_size ? NULL : malloc(buf_len);
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if (!buf || umoven(tcp, addr, buf_len, buf) < 0) {
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printaddr(addr);
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@ -277,7 +279,7 @@ decode_msg_control(struct tcb *const tcp, const kernel_ureg_t addr,
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tprints("[");
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while (buf_len >= cmsg_size) {
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const size_t cmsg_len =
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const kernel_ureg_t cmsg_len =
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#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
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(current_wordsize < sizeof(long)) ? u.cmsg32->cmsg_len :
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#endif
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@ -299,7 +301,7 @@ decode_msg_control(struct tcb *const tcp, const kernel_ureg_t addr,
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printxval(socketlayers, cmsg_level, "SOL_???");
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tprints(", cmsg_type=");
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size_t len = cmsg_len > buf_len ? buf_len : cmsg_len;
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kernel_ureg_t len = cmsg_len > buf_len ? buf_len : cmsg_len;
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print_cmsg_type_data(tcp, cmsg_level, cmsg_type,
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(const void *) (u.ptr + cmsg_size),
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@ -311,7 +313,7 @@ decode_msg_control(struct tcb *const tcp, const kernel_ureg_t addr,
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break;
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}
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len = (cmsg_len + current_wordsize - 1) &
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(size_t) ~(current_wordsize - 1);
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~((kernel_ureg_t) current_wordsize - 1);
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if (len >= buf_len) {
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buf_len = 0;
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break;
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