Date: Wed, 22 Mar 2023 22:28:29 GMT From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 0ae8e682d806 - stable/12 - dtrace: avoid gcc9 Walloca-larger-than Message-ID: <202303222228.32MMSTMm001654@gitrepo.freebsd.org>
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The branch stable/12 has been updated by jhb: URL: https://cgit.FreeBSD.org/src/commit/?id=0ae8e682d8063a1cb16bf2de18a10681d3c17411 commit 0ae8e682d8063a1cb16bf2de18a10681d3c17411 Author: Ryan Libby <rlibby@FreeBSD.org> AuthorDate: 2019-12-21 02:44:13 +0000 Commit: John Baldwin <jhb@FreeBSD.org> CommitDate: 2023-03-22 02:18:22 +0000 dtrace: avoid gcc9 Walloca-larger-than gcc9 grew a new warning for unbounded allocas, such as the one in dt_options_load. Remove both uses of alloca in dt_options.c. Reviewed by: markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D22880 (cherry picked from commit fa19b250bdb7e463b58a8e7628ebea09a44197f3) --- .../opensolaris/lib/libdtrace/common/dt_options.c | 68 +++++++++++++++------- 1 file changed, 47 insertions(+), 21 deletions(-) diff --git a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_options.c b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_options.c index c99e6007f9da..ce13659f1685 100644 --- a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_options.c +++ b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_options.c @@ -38,9 +38,6 @@ #include <stdlib.h> #include <unistd.h> #include <limits.h> -#ifdef illumos -#include <alloca.h> -#endif #include <errno.h> #include <fcntl.h> @@ -162,26 +159,40 @@ dt_opt_cpp_path(dtrace_hdl_t *dtp, const char *arg, uintptr_t option) static int dt_opt_cpp_opts(dtrace_hdl_t *dtp, const char *arg, uintptr_t option) { - char *buf; + char *buf = NULL; size_t len; const char *opt = (const char *)option; + int ret; - if (opt == NULL || arg == NULL) - return (dt_set_errno(dtp, EDT_BADOPTVAL)); + if (opt == NULL || arg == NULL) { + ret = dt_set_errno(dtp, EDT_BADOPTVAL); + goto out; + } - if (dtp->dt_pcb != NULL) - return (dt_set_errno(dtp, EDT_BADOPTCTX)); + if (dtp->dt_pcb != NULL) { + ret = dt_set_errno(dtp, EDT_BADOPTCTX); + goto out; + } len = strlen(opt) + strlen(arg) + 1; - buf = alloca(len); + if ((buf = dt_alloc(dtp, len)) == NULL) { + ret = dt_set_errno(dtp, EDT_NOMEM); + goto out; + } (void) strcpy(buf, opt); (void) strcat(buf, arg); - if (dt_cpp_add_arg(dtp, buf) == NULL) - return (dt_set_errno(dtp, EDT_NOMEM)); + if (dt_cpp_add_arg(dtp, buf) == NULL) { + ret = dt_set_errno(dtp, EDT_NOMEM); + goto out; + } - return (0); + ret = 0; +out: + if (buf != NULL) + dt_free(dtp, buf); + return (ret); } /*ARGSUSED*/ @@ -885,27 +896,35 @@ dt_options_load(dtrace_hdl_t *dtp) dof_hdr_t hdr, *dof; dof_sec_t *sec; size_t offs; - int i; + int i, ret; /* * To load the option values, we need to ask the kernel to provide its * DOF, which we'll sift through to look for OPTDESC sections. */ + dof = &hdr; bzero(&hdr, sizeof (dof_hdr_t)); hdr.dofh_loadsz = sizeof (dof_hdr_t); #ifdef illumos - if (dt_ioctl(dtp, DTRACEIOC_DOFGET, &hdr) == -1) + if (dt_ioctl(dtp, DTRACEIOC_DOFGET, dof) == -1) #else - dof = &hdr; if (dt_ioctl(dtp, DTRACEIOC_DOFGET, &dof) == -1) #endif - return (dt_set_errno(dtp, errno)); + { + ret = dt_set_errno(dtp, errno); + goto out; + } - if (hdr.dofh_loadsz < sizeof (dof_hdr_t)) - return (dt_set_errno(dtp, EINVAL)); + if (hdr.dofh_loadsz < sizeof (dof_hdr_t)) { + ret = dt_set_errno(dtp, EINVAL); + goto out; + } - dof = alloca(hdr.dofh_loadsz); + if ((dof = dt_alloc(dtp, hdr.dofh_loadsz)) == NULL) { + ret = dt_set_errno(dtp, EDT_NOMEM); + goto out; + } bzero(dof, sizeof (dof_hdr_t)); dof->dofh_loadsz = hdr.dofh_loadsz; @@ -917,7 +936,10 @@ dt_options_load(dtrace_hdl_t *dtp) #else if (dt_ioctl(dtp, DTRACEIOC_DOFGET, &dof) == -1) #endif - return (dt_set_errno(dtp, errno)); + { + ret = dt_set_errno(dtp, errno); + goto out; + } for (i = 0; i < dof->dofh_secnum; i++) { sec = (dof_sec_t *)(uintptr_t)((uintptr_t)dof + @@ -942,7 +964,11 @@ dt_options_load(dtrace_hdl_t *dtp) dtp->dt_options[opt->dofo_option] = opt->dofo_value; } - return (0); + ret = 0; +out: + if (dof != NULL && dof != &hdr) + dt_free(dtp, dof); + return (ret); } typedef struct dt_option {
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