6f6924e5a6
CTF data from a module. On subsequent attempts to retrieve CTF data for a module, return an error if there no CTF data. This fixes a panic if you try to enable fbt probes on a module with CTF data twice. Submitted by: Paul Ambrose (ambrosehua AT gmail DOT com) MFC after: 3 days
344 lines
9.2 KiB
C
344 lines
9.2 KiB
C
/*-
|
|
* Copyright (c) 2008 John Birrell <jb@freebsd.org>
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* 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
|
|
static void *
|
|
z_alloc(void *nil, u_int items, u_int size)
|
|
{
|
|
void *ptr;
|
|
|
|
ptr = malloc(items * size, M_TEMP, M_NOWAIT);
|
|
return ptr;
|
|
}
|
|
|
|
static void
|
|
z_free(void *nil, void *ptr)
|
|
{
|
|
free(ptr, M_TEMP);
|
|
}
|
|
|
|
#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;
|
|
int resid;
|
|
int vfslocked;
|
|
size_t sz;
|
|
struct nameidata nd;
|
|
struct thread *td = curthread;
|
|
uint8_t ctf_hdr[CTF_HDR_SIZE];
|
|
#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 | MPSAFE, UIO_SYSSPACE, lf->pathname, td);
|
|
flags = FREAD;
|
|
error = vn_open(&nd, &flags, 0, NULL);
|
|
if (error)
|
|
return (error);
|
|
vfslocked = NDHASGIANT(&nd);
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
|
|
/* Allocate memory for the FLF header. */
|
|
if ((hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK)) == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* 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, &resid,
|
|
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 */
|
|
if ((shdr = malloc(nbytes, M_LINKER, M_WAITOK)) == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* 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,
|
|
&resid, 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. */
|
|
if ((shstrtab = malloc(shdr[hdr->e_shstrndx].sh_size, M_LINKER,
|
|
M_WAITOK)) == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* 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, &resid,
|
|
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),
|
|
shdr[i].sh_offset, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
|
|
NOCRED, &resid, td)) != 0)
|
|
goto out;
|
|
|
|
/* Check the CTF magic number. (XXX check for big endian!) */
|
|
if (ctf_hdr[0] != 0xf1 || ctf_hdr[1] != 0xcf) {
|
|
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) {
|
|
printf("%s(%d): module %s CTF format version is %d "
|
|
"(2 expected)\n",
|
|
__func__, __LINE__, lf->pathname, ctf_hdr[2]);
|
|
error = EFTYPE;
|
|
goto out;
|
|
}
|
|
|
|
/* Check if the data is compressed. */
|
|
if ((ctf_hdr[3] & 0x1) != 0) {
|
|
uint32_t *u32 = (uint32_t *) ctf_hdr;
|
|
|
|
/*
|
|
* 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
|
|
* information to determine the decompressed CTF data
|
|
* buffer required.
|
|
*/
|
|
sz = u32[CTF_HDR_STRTAB_U32] + u32[CTF_HDR_STRLEN_U32] +
|
|
sizeof(ctf_hdr);
|
|
|
|
/*
|
|
* Allocate memory for the compressed CTF data, including
|
|
* the header (which isn't compressed).
|
|
*/
|
|
if ((raw = malloc(shdr[i].sh_size, M_LINKER, M_WAITOK)) == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
} 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 it's decompressed
|
|
* form.
|
|
*/
|
|
if ((ctftab = malloc(sz, M_LINKER, M_WAITOK)) == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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, &resid, td)) != 0)
|
|
goto out;
|
|
|
|
/* Check if decompression is required. */
|
|
if (raw != NULL) {
|
|
z_stream zs;
|
|
int ret;
|
|
|
|
/*
|
|
* The header isn't compressed, so copy that into the
|
|
* CTF buffer first.
|
|
*/
|
|
bcopy(ctf_hdr, ctftab, sizeof(ctf_hdr));
|
|
|
|
/* Initialise the zlib structure. */
|
|
bzero(&zs, sizeof(zs));
|
|
zs.zalloc = z_alloc;
|
|
zs.zfree = z_free;
|
|
|
|
if (inflateInit(&zs) != Z_OK) {
|
|
error = EIO;
|
|
goto out;
|
|
}
|
|
|
|
zs.avail_in = shdr[i].sh_size - sizeof(ctf_hdr);
|
|
zs.next_in = ((uint8_t *) raw) + sizeof(ctf_hdr);
|
|
zs.avail_out = sz - sizeof(ctf_hdr);
|
|
zs.next_out = ((uint8_t *) ctftab) + sizeof(ctf_hdr);
|
|
if ((ret = inflate(&zs, Z_FINISH)) != Z_STREAM_END) {
|
|
printf("%s(%d): zlib inflate 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, 0);
|
|
vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
|
|
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);
|
|
}
|