More paranoia against overflows
This commit is contained in:
Eivind Eklund
parent
1716750c65
commit
b8c8516a7f
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@ -55,6 +55,7 @@
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#include <vm/vm_param.h>
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#include <sys/exec.h>
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#define DOCHECK() do { if (ps >= psbuf+sizeof(psbuf)) goto bailout; } while (0)
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int
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procfs_dostatus(curp, p, pfs, uio)
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struct proc *curp;
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@ -71,7 +72,7 @@ procfs_dostatus(curp, p, pfs, uio)
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int i;
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int xlen;
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int error;
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char psbuf[256+MAXHOSTNAMELEN]; /* XXX - conservative */
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char psbuf[256]; /* XXX - conservative */
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if (uio->uio_rw != UIO_READ)
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return (EOPNOTSUPP);
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@ -85,62 +86,85 @@ procfs_dostatus(curp, p, pfs, uio)
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/* comm pid ppid pgid sid maj,min ctty,sldr start ut st wmsg
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euid ruid rgid,egid,groups[1 .. NGROUPS]
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*/
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KASSERT(sizeof(psbuf) > MAXCOMLEN,
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("Too short buffer for new MAXCOMLEN"));
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ps = psbuf;
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bcopy(p->p_comm, ps, MAXCOMLEN);
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ps[MAXCOMLEN] = '\0';
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ps += strlen(ps);
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ps += sprintf(ps, " %d %d %d %d ", pid, ppid, pgid, sid);
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DOCHECK();
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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" %d %d %d %d ", pid, ppid, pgid, sid);
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DOCHECK();
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if ((p->p_flag&P_CONTROLT) && (tp = sess->s_ttyp))
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ps += sprintf(ps, "%d,%d ", major(tp->t_dev), minor(tp->t_dev));
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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"%d,%d ", major(tp->t_dev), minor(tp->t_dev));
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else
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ps += sprintf(ps, "%d,%d ", -1, -1);
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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"%d,%d ", -1, -1);
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DOCHECK();
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sep = "";
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if (sess->s_ttyvp) {
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ps += sprintf(ps, "%sctty", sep);
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, "%sctty", sep);
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sep = ",";
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DOCHECK();
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}
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if (SESS_LEADER(p)) {
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ps += sprintf(ps, "%ssldr", sep);
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, "%ssldr", sep);
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sep = ",";
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DOCHECK();
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}
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if (*sep != ',') {
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, "noflags");
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DOCHECK();
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}
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if (*sep != ',')
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ps += sprintf(ps, "noflags");
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if (p->p_flag & P_INMEM) {
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struct timeval ut, st;
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calcru(p, &ut, &st, (struct timeval *) NULL);
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ps += sprintf(ps, " %ld,%ld %ld,%ld %ld,%ld",
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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" %ld,%ld %ld,%ld %ld,%ld",
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p->p_stats->p_start.tv_sec,
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p->p_stats->p_start.tv_usec,
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ut.tv_sec, ut.tv_usec,
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st.tv_sec, st.tv_usec);
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} else
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ps += sprintf(ps, " -1,-1 -1,-1 -1,-1");
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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" -1,-1 -1,-1 -1,-1");
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DOCHECK();
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ps += sprintf(ps, " %s",
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, " %s",
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(p->p_wchan && p->p_wmesg) ? p->p_wmesg : "nochan");
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DOCHECK();
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cr = p->p_ucred;
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ps += sprintf(ps, " %lu %lu %lu",
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, " %lu %lu %lu",
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(u_long)cr->cr_uid,
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(u_long)p->p_cred->p_ruid,
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(u_long)p->p_cred->p_rgid);
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DOCHECK();
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/* egid (p->p_cred->p_svgid) is equal to cr_ngroups[0]
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see also getegid(2) in /sys/kern/kern_prot.c */
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for (i = 0; i < cr->cr_ngroups; i++)
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ps += sprintf(ps, ",%lu", (u_long)cr->cr_groups[i]);
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for (i = 0; i < cr->cr_ngroups; i++) {
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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",%lu", (u_long)cr->cr_groups[i]);
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DOCHECK();
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}
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if (p->p_prison)
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ps += sprintf(ps, " %s", p->p_prison->pr_host);
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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" %s", p->p_prison->pr_host);
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else
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ps += sprintf(ps, " -");
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ps += sprintf(ps, "\n");
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, " -");
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DOCHECK();
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, "\n");
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DOCHECK();
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xlen = ps - psbuf;
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xlen -= uio->uio_offset;
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@ -152,6 +176,9 @@ procfs_dostatus(curp, p, pfs, uio)
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error = uiomove(ps, xlen, uio);
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return (error);
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bailout:
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return (ENOMEM);
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}
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int
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@ -55,6 +55,7 @@
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#include <vm/vm_param.h>
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#include <sys/exec.h>
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#define DOCHECK() do { if (ps >= psbuf+sizeof(psbuf)) goto bailout; } while (0)
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int
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procfs_dostatus(curp, p, pfs, uio)
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struct proc *curp;
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@ -71,7 +72,7 @@ procfs_dostatus(curp, p, pfs, uio)
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int i;
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int xlen;
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int error;
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char psbuf[256+MAXHOSTNAMELEN]; /* XXX - conservative */
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char psbuf[256]; /* XXX - conservative */
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if (uio->uio_rw != UIO_READ)
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return (EOPNOTSUPP);
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@ -85,62 +86,85 @@ procfs_dostatus(curp, p, pfs, uio)
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/* comm pid ppid pgid sid maj,min ctty,sldr start ut st wmsg
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euid ruid rgid,egid,groups[1 .. NGROUPS]
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*/
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KASSERT(sizeof(psbuf) > MAXCOMLEN,
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("Too short buffer for new MAXCOMLEN"));
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ps = psbuf;
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bcopy(p->p_comm, ps, MAXCOMLEN);
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ps[MAXCOMLEN] = '\0';
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ps += strlen(ps);
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ps += sprintf(ps, " %d %d %d %d ", pid, ppid, pgid, sid);
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DOCHECK();
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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" %d %d %d %d ", pid, ppid, pgid, sid);
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DOCHECK();
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if ((p->p_flag&P_CONTROLT) && (tp = sess->s_ttyp))
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ps += sprintf(ps, "%d,%d ", major(tp->t_dev), minor(tp->t_dev));
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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"%d,%d ", major(tp->t_dev), minor(tp->t_dev));
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else
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ps += sprintf(ps, "%d,%d ", -1, -1);
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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"%d,%d ", -1, -1);
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DOCHECK();
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sep = "";
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if (sess->s_ttyvp) {
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ps += sprintf(ps, "%sctty", sep);
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, "%sctty", sep);
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sep = ",";
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DOCHECK();
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}
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if (SESS_LEADER(p)) {
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ps += sprintf(ps, "%ssldr", sep);
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, "%ssldr", sep);
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sep = ",";
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DOCHECK();
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}
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if (*sep != ',') {
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, "noflags");
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DOCHECK();
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}
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if (*sep != ',')
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ps += sprintf(ps, "noflags");
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if (p->p_flag & P_INMEM) {
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struct timeval ut, st;
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calcru(p, &ut, &st, (struct timeval *) NULL);
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ps += sprintf(ps, " %ld,%ld %ld,%ld %ld,%ld",
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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" %ld,%ld %ld,%ld %ld,%ld",
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p->p_stats->p_start.tv_sec,
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p->p_stats->p_start.tv_usec,
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ut.tv_sec, ut.tv_usec,
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st.tv_sec, st.tv_usec);
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} else
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ps += sprintf(ps, " -1,-1 -1,-1 -1,-1");
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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" -1,-1 -1,-1 -1,-1");
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DOCHECK();
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ps += sprintf(ps, " %s",
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, " %s",
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(p->p_wchan && p->p_wmesg) ? p->p_wmesg : "nochan");
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DOCHECK();
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cr = p->p_ucred;
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ps += sprintf(ps, " %lu %lu %lu",
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, " %lu %lu %lu",
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(u_long)cr->cr_uid,
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(u_long)p->p_cred->p_ruid,
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(u_long)p->p_cred->p_rgid);
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DOCHECK();
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/* egid (p->p_cred->p_svgid) is equal to cr_ngroups[0]
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see also getegid(2) in /sys/kern/kern_prot.c */
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for (i = 0; i < cr->cr_ngroups; i++)
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ps += sprintf(ps, ",%lu", (u_long)cr->cr_groups[i]);
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for (i = 0; i < cr->cr_ngroups; i++) {
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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",%lu", (u_long)cr->cr_groups[i]);
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DOCHECK();
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}
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if (p->p_prison)
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ps += sprintf(ps, " %s", p->p_prison->pr_host);
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps,
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" %s", p->p_prison->pr_host);
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else
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ps += sprintf(ps, " -");
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ps += sprintf(ps, "\n");
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, " -");
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DOCHECK();
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ps += snprintf(ps, psbuf + sizeof(psbuf) - ps, "\n");
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DOCHECK();
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xlen = ps - psbuf;
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xlen -= uio->uio_offset;
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@ -152,6 +176,9 @@ procfs_dostatus(curp, p, pfs, uio)
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error = uiomove(ps, xlen, uio);
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return (error);
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bailout:
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return (ENOMEM);
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}
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int
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