diff --git a/sys/kern/kern_ctf.c b/sys/kern/kern_ctf.c index ee7576ab6fb9..55e73b78c8ed 100644 --- a/sys/kern/kern_ctf.c +++ b/sys/kern/kern_ctf.c @@ -1,304 +1,292 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2008 John Birrell * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ +#include + /* * Note this file is included by both link_elf.c and link_elf_obj.c. - * - * The CTF header structure definition can't be used here because it's - * (annoyingly) covered by the CDDL. We will just use a few bytes from - * it as an integer array where we 'know' what they mean. */ -#define CTF_HDR_SIZE 36 -#define CTF_HDR_STRTAB_U32 7 -#define CTF_HDR_STRLEN_U32 8 #ifdef DDB_CTF #include #endif static int link_elf_ctf_get(linker_file_t lf, linker_ctf_t *lc) { #ifdef DDB_CTF Elf_Ehdr *hdr = NULL; Elf_Shdr *shdr = NULL; caddr_t ctftab = NULL; caddr_t raw = NULL; caddr_t shstrtab = NULL; elf_file_t ef = (elf_file_t) lf; int flags; int i; int nbytes; size_t sz; struct nameidata nd; struct thread *td = curthread; - uint8_t ctf_hdr[CTF_HDR_SIZE]; + struct ctf_header cth; #endif int error = 0; if (lf == NULL || lc == NULL) return (EINVAL); /* Set the defaults for no CTF present. That's not a crime! */ bzero(lc, sizeof(*lc)); #ifdef DDB_CTF /* * First check if we've tried to load CTF data previously and the * CTF ELF section wasn't found. We flag that condition by setting * ctfcnt to -1. See below. */ if (ef->ctfcnt < 0) return (EFTYPE); /* Now check if we've already loaded the CTF data.. */ if (ef->ctfcnt > 0) { /* We only need to load once. */ lc->ctftab = ef->ctftab; lc->ctfcnt = ef->ctfcnt; lc->symtab = ef->ddbsymtab; lc->strtab = ef->ddbstrtab; lc->strcnt = ef->ddbstrcnt; lc->nsym = ef->ddbsymcnt; lc->ctfoffp = (uint32_t **) &ef->ctfoff; lc->typoffp = (uint32_t **) &ef->typoff; lc->typlenp = &ef->typlen; return (0); } /* * We need to try reading the CTF data. Flag no CTF data present * by default and if we actually succeed in reading it, we'll * update ctfcnt to the number of bytes read. */ ef->ctfcnt = -1; NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, lf->pathname, td); flags = FREAD; error = vn_open(&nd, &flags, 0, NULL); if (error) return (error); NDFREE(&nd, NDF_ONLY_PNBUF); /* Allocate memory for the FLF header. */ hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK); /* Read the ELF header. */ if ((error = vn_rdwr(UIO_READ, nd.ni_vp, hdr, sizeof(*hdr), 0, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, NULL, td)) != 0) goto out; /* Sanity check. */ if (!IS_ELF(*hdr)) { error = ENOEXEC; goto out; } nbytes = hdr->e_shnum * hdr->e_shentsize; if (nbytes == 0 || hdr->e_shoff == 0 || hdr->e_shentsize != sizeof(Elf_Shdr)) { error = ENOEXEC; goto out; } /* Allocate memory for all the section headers */ shdr = malloc(nbytes, M_LINKER, M_WAITOK); /* Read all the section headers */ if ((error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, NULL, td)) != 0) goto out; /* * We need to search for the CTF section by name, so if the * section names aren't present, then we can't locate the * .SUNW_ctf section containing the CTF data. */ if (hdr->e_shstrndx == 0 || shdr[hdr->e_shstrndx].sh_type != SHT_STRTAB) { printf("%s(%d): module %s e_shstrndx is %d, sh_type is %d\n", __func__, __LINE__, lf->pathname, hdr->e_shstrndx, shdr[hdr->e_shstrndx].sh_type); error = EFTYPE; goto out; } /* Allocate memory to buffer the section header strings. */ shstrtab = malloc(shdr[hdr->e_shstrndx].sh_size, M_LINKER, M_WAITOK); /* Read the section header strings. */ if ((error = vn_rdwr(UIO_READ, nd.ni_vp, shstrtab, shdr[hdr->e_shstrndx].sh_size, shdr[hdr->e_shstrndx].sh_offset, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, NULL, td)) != 0) goto out; /* Search for the section containing the CTF data. */ for (i = 0; i < hdr->e_shnum; i++) if (strcmp(".SUNW_ctf", shstrtab + shdr[i].sh_name) == 0) break; /* Check if the CTF section wasn't found. */ if (i >= hdr->e_shnum) { printf("%s(%d): module %s has no .SUNW_ctf section\n", __func__, __LINE__, lf->pathname); error = EFTYPE; goto out; } /* Read the CTF header. */ - if ((error = vn_rdwr(UIO_READ, nd.ni_vp, ctf_hdr, sizeof(ctf_hdr), + if ((error = vn_rdwr(UIO_READ, nd.ni_vp, &cth, sizeof(cth), shdr[i].sh_offset, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, NULL, td)) != 0) goto out; /* Check the CTF magic number. */ -#ifdef __LITTLE_ENDIAN__ - if (ctf_hdr[0] != 0xf1 || ctf_hdr[1] != 0xcf) { -#else - if (ctf_hdr[0] != 0xcf || ctf_hdr[1] != 0xf1) { -#endif + if (cth.cth_magic != CTF_MAGIC) { printf("%s(%d): module %s has invalid format\n", __func__, __LINE__, lf->pathname); error = EFTYPE; goto out; } /* Check if version 2. */ - if (ctf_hdr[2] != 2) { + if (cth.cth_version != CTF_VERSION_2) { printf("%s(%d): module %s CTF format version is %d " "(2 expected)\n", - __func__, __LINE__, lf->pathname, ctf_hdr[2]); + __func__, __LINE__, lf->pathname, cth.cth_version); error = EFTYPE; goto out; } /* Check if the data is compressed. */ - if ((ctf_hdr[3] & 0x1) != 0) { - uint32_t *u32 = (uint32_t *) ctf_hdr; - + if ((cth.cth_flags & CTF_F_COMPRESS) != 0) { /* * The last two fields in the CTF header are the offset * from the end of the header to the start of the string - * data and the length of that string data. se this + * data and the length of that string data. Use this * information to determine the decompressed CTF data * buffer required. */ - sz = u32[CTF_HDR_STRTAB_U32] + u32[CTF_HDR_STRLEN_U32] + - sizeof(ctf_hdr); + sz = cth.cth_stroff + cth.cth_strlen + sizeof(cth); /* * Allocate memory for the compressed CTF data, including * the header (which isn't compressed). */ raw = malloc(shdr[i].sh_size, M_LINKER, M_WAITOK); } else { /* * The CTF data is not compressed, so the ELF section * size is the same as the buffer size required. */ sz = shdr[i].sh_size; } /* * Allocate memory to buffer the CTF data in its decompressed * form. */ ctftab = malloc(sz, M_LINKER, M_WAITOK); /* * Read the CTF data into the raw buffer if compressed, or * directly into the CTF buffer otherwise. */ if ((error = vn_rdwr(UIO_READ, nd.ni_vp, raw == NULL ? ctftab : raw, shdr[i].sh_size, shdr[i].sh_offset, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, NULL, td)) != 0) goto out; /* Check if decompression is required. */ if (raw != NULL) { uLongf destlen; int ret; /* * The header isn't compressed, so copy that into the * CTF buffer first. */ - bcopy(ctf_hdr, ctftab, sizeof(ctf_hdr)); + bcopy(&cth, ctftab, sizeof(cth)); - destlen = sz - sizeof(ctf_hdr); - ret = uncompress(((uint8_t *) ctftab) + sizeof(ctf_hdr), - &destlen, ((uint8_t *) raw) + sizeof(ctf_hdr), - shdr[i].sh_size - sizeof(ctf_hdr)); + destlen = sz - sizeof(cth); + ret = uncompress(ctftab + sizeof(cth), &destlen, + raw + sizeof(cth), shdr[i].sh_size - sizeof(cth)); if (ret != Z_OK) { - printf("%s(%d): zlib uncompress returned %d\n", __func__, __LINE__, ret); + printf("%s(%d): zlib uncompress returned %d\n", + __func__, __LINE__, ret); error = EIO; goto out; } } /* Got the CTF data! */ ef->ctftab = ctftab; ef->ctfcnt = shdr[i].sh_size; /* We'll retain the memory allocated for the CTF data. */ ctftab = NULL; /* Let the caller use the CTF data read. */ lc->ctftab = ef->ctftab; lc->ctfcnt = ef->ctfcnt; lc->symtab = ef->ddbsymtab; lc->strtab = ef->ddbstrtab; lc->strcnt = ef->ddbstrcnt; lc->nsym = ef->ddbsymcnt; lc->ctfoffp = (uint32_t **) &ef->ctfoff; lc->typoffp = (uint32_t **) &ef->typoff; lc->typlenp = &ef->typlen; out: VOP_UNLOCK(nd.ni_vp); vn_close(nd.ni_vp, FREAD, td->td_ucred, td); if (hdr != NULL) free(hdr, M_LINKER); if (shdr != NULL) free(shdr, M_LINKER); if (shstrtab != NULL) free(shstrtab, M_LINKER); if (ctftab != NULL) free(ctftab, M_LINKER); if (raw != NULL) free(raw, M_LINKER); #else error = EOPNOTSUPP; #endif return (error); }