Author: markj Date: Mon Nov 17 22:22:16 2014 New Revision: 274637 URL: https://svnweb.freebsd.org/changeset/base/274637
Log: DTrace imposes a 128-byte limit on the length of the function component of a probe name. When dtrace -G builds up a DOF section for the specified provider(s), the probe function names are truncated to fit in this limit. The DOF is later used to build the symbol table for the generated object file, so the table can end up with truncated references, causing link errors. Instead of potentially truncating symbol table entries, write the full function name to the DOF string table and allow the kernel to enforce the 128-byte function name limit when a process attempts to load its DOF. PR: 194757 Differential Revision: https://reviews.freebsd.org/D1175 Reviewed by: rpaulo MFC after: 2 weeks Modified: head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_dof.c head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_provider.c head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_provider.h Modified: head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_dof.c ============================================================================== --- head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_dof.c Mon Nov 17 21:01:35 2014 (r274636) +++ head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_dof.c Mon Nov 17 22:22:16 2014 (r274637) @@ -469,7 +469,7 @@ dof_add_probe(dt_idhash_t *dhp, dt_ident * locally so an alternate symbol is added for the purpose * of this relocation. */ - if (pip->pi_rname[0] == '\0') + if (pip->pi_rname == NULL) dofr.dofr_name = dofpr.dofpr_func; else dofr.dofr_name = dof_add_string(ddo, pip->pi_rname); Modified: head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_provider.c ============================================================================== --- head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_provider.c Mon Nov 17 21:01:35 2014 (r274636) +++ head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_provider.c Mon Nov 17 22:22:16 2014 (r274637) @@ -520,6 +520,8 @@ dt_probe_destroy(dt_probe_t *prp) for (pip = prp->pr_inst; pip != NULL; pip = pip_next) { pip_next = pip->pi_next; + dt_free(dtp, pip->pi_rname); + dt_free(dtp, pip->pi_fname); dt_free(dtp, pip->pi_offs); dt_free(dtp, pip->pi_enoffs); dt_free(dtp, pip); @@ -552,28 +554,18 @@ dt_probe_define(dt_provider_t *pvp, dt_p if ((pip = dt_zalloc(dtp, sizeof (*pip))) == NULL) return (-1); - if ((pip->pi_offs = dt_zalloc(dtp, - sizeof (uint32_t))) == NULL) { - dt_free(dtp, pip); - return (-1); - } + if ((pip->pi_offs = dt_zalloc(dtp, sizeof (uint32_t))) == NULL) + goto nomem; if ((pip->pi_enoffs = dt_zalloc(dtp, - sizeof (uint32_t))) == NULL) { - dt_free(dtp, pip->pi_offs); - dt_free(dtp, pip); - return (-1); - } + sizeof (uint32_t))) == NULL) + goto nomem; - (void) strlcpy(pip->pi_fname, fname, sizeof (pip->pi_fname)); - if (rname != NULL) { - if (strlen(rname) + 1 > sizeof (pip->pi_rname)) { - dt_free(dtp, pip->pi_offs); - dt_free(dtp, pip); - return (dt_set_errno(dtp, EDT_COMPILER)); - } - (void) strcpy(pip->pi_rname, rname); - } + if ((pip->pi_fname = strdup(fname)) == NULL) + goto nomem; + + if (rname != NULL && (pip->pi_rname = strdup(rname)) == NULL) + goto nomem; pip->pi_noffs = 0; pip->pi_maxoffs = 1; @@ -618,6 +610,13 @@ dt_probe_define(dt_provider_t *pvp, dt_p (*offs)[(*noffs)++] = offset; return (0); + +nomem: + dt_free(dtp, pip->pi_fname); + dt_free(dtp, pip->pi_enoffs); + dt_free(dtp, pip->pi_offs); + dt_free(dtp, pip); + return (dt_set_errno(dtp, EDT_NOMEM)); } /* Modified: head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_provider.h ============================================================================== --- head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_provider.h Mon Nov 17 21:01:35 2014 (r274636) +++ head/cddl/contrib/opensolaris/lib/libdtrace/common/dt_provider.h Mon Nov 17 22:22:16 2014 (r274637) @@ -64,8 +64,8 @@ typedef struct dt_probe_iter { } dt_probe_iter_t; typedef struct dt_probe_instance { - char pi_fname[DTRACE_FUNCNAMELEN]; /* function name */ - char pi_rname[DTRACE_FUNCNAMELEN + 20]; /* mangled relocation name */ + char *pi_fname; /* function name */ + char *pi_rname; /* mangled relocation name */ uint32_t *pi_offs; /* offsets into the function */ uint32_t *pi_enoffs; /* is-enabled offsets */ uint_t pi_noffs; /* number of offsets */ _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
