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glibc/elf/pldd-xx.c
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/* Copyright (C) 2011-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#define E(name) E_(name, CLASS) | |
#define E_(name, cl) E__(name, cl) | |
#define E__(name, cl) name##cl | |
#define EW(type) EW_(Elf, CLASS, type) | |
#define EW_(e, w, t) EW__(e, w, _##t) | |
#define EW__(e, w, t) e##w##t | |
#define pldd_assert(name, exp) \ | |
typedef int __assert_##name[((exp) != 0) - 1] | |
struct E(link_map) | |
{ | |
EW(Addr) l_addr; | |
EW(Addr) l_name; | |
EW(Addr) l_ld; | |
EW(Addr) l_next; | |
EW(Addr) l_prev; | |
EW(Addr) l_real; | |
Lmid_t l_ns; | |
EW(Addr) l_libname; | |
}; | |
#if CLASS == __ELF_NATIVE_CLASS | |
pldd_assert (l_addr, (offsetof (struct link_map, l_addr) | |
== offsetof (struct E(link_map), l_addr))); | |
pldd_assert (l_name, (offsetof (struct link_map, l_name) | |
== offsetof (struct E(link_map), l_name))); | |
pldd_assert (l_next, (offsetof (struct link_map, l_next) | |
== offsetof (struct E(link_map), l_next))); | |
#endif | |
struct E(libname_list) | |
{ | |
EW(Addr) name; | |
EW(Addr) next; | |
}; | |
#if CLASS == __ELF_NATIVE_CLASS | |
pldd_assert (name, (offsetof (struct libname_list, name) | |
== offsetof (struct E(libname_list), name))); | |
pldd_assert (next, (offsetof (struct libname_list, next) | |
== offsetof (struct E(libname_list), next))); | |
#endif | |
struct E(r_debug) | |
{ | |
int r_version; | |
#if CLASS == 64 | |
int pad; | |
#endif | |
EW(Addr) r_map; | |
}; | |
#if CLASS == __ELF_NATIVE_CLASS | |
pldd_assert (r_version, (offsetof (struct r_debug, r_version) | |
== offsetof (struct E(r_debug), r_version))); | |
pldd_assert (r_map, (offsetof (struct r_debug, r_map) | |
== offsetof (struct E(r_debug), r_map))); | |
#endif | |
static int | |
E(find_maps) (pid_t pid, void *auxv, size_t auxv_size) | |
{ | |
EW(Addr) phdr = 0; | |
unsigned int phnum = 0; | |
unsigned int phent = 0; | |
EW(auxv_t) *auxvXX = (EW(auxv_t) *) auxv; | |
for (int i = 0; i < auxv_size / sizeof (EW(auxv_t)); ++i) | |
switch (auxvXX[i].a_type) | |
{ | |
case AT_PHDR: | |
phdr = auxvXX[i].a_un.a_val; | |
break; | |
case AT_PHNUM: | |
phnum = auxvXX[i].a_un.a_val; | |
break; | |
case AT_PHENT: | |
phent = auxvXX[i].a_un.a_val; | |
break; | |
default: | |
break; | |
} | |
if (phdr == 0 || phnum == 0 || phent == 0) | |
error (EXIT_FAILURE, 0, gettext ("cannot find program header of process")); | |
EW(Phdr) *p = alloca (phnum * phent); | |
if (pread64 (memfd, p, phnum * phent, phdr) != phnum * phent) | |
{ | |
error (0, 0, gettext ("cannot read program header")); | |
return EXIT_FAILURE; | |
} | |
/* Determine the load offset. We need this for interpreting the | |
other program header entries so we do this in a separate loop. | |
Fortunately it is the first time unless someone does something | |
stupid when linking the application. */ | |
EW(Addr) offset = 0; | |
for (unsigned int i = 0; i < phnum; ++i) | |
if (p[i].p_type == PT_PHDR) | |
{ | |
offset = phdr - p[i].p_vaddr; | |
break; | |
} | |
EW(Addr) list = 0; | |
char *interp = NULL; | |
for (unsigned int i = 0; i < phnum; ++i) | |
if (p[i].p_type == PT_DYNAMIC) | |
{ | |
EW(Dyn) *dyn = xmalloc (p[i].p_filesz); | |
if (pread64 (memfd, dyn, p[i].p_filesz, offset + p[i].p_vaddr) | |
!= p[i].p_filesz) | |
{ | |
error (0, 0, gettext ("cannot read dynamic section")); | |
return EXIT_FAILURE; | |
} | |
/* Search for the DT_DEBUG entry. */ | |
for (unsigned int j = 0; j < p[i].p_filesz / sizeof (EW(Dyn)); ++j) | |
if (dyn[j].d_tag == DT_DEBUG && dyn[j].d_un.d_ptr != 0) | |
{ | |
struct E(r_debug) r; | |
if (pread64 (memfd, &r, sizeof (r), dyn[j].d_un.d_ptr) | |
!= sizeof (r)) | |
{ | |
error (0, 0, gettext ("cannot read r_debug")); | |
return EXIT_FAILURE; | |
} | |
if (r.r_map != 0) | |
{ | |
list = r.r_map; | |
break; | |
} | |
} | |
free (dyn); | |
break; | |
} | |
else if (p[i].p_type == PT_INTERP) | |
{ | |
interp = alloca (p[i].p_filesz); | |
if (pread64 (memfd, interp, p[i].p_filesz, offset + p[i].p_vaddr) | |
!= p[i].p_filesz) | |
{ | |
error (0, 0, gettext ("cannot read program interpreter")); | |
return EXIT_FAILURE; | |
} | |
} | |
if (list == 0) | |
{ | |
if (interp == NULL) | |
{ | |
// XXX check whether the executable itself is the loader | |
return EXIT_FAILURE; | |
} | |
// XXX perhaps try finding ld.so and _r_debug in it | |
return EXIT_FAILURE; | |
} | |
/* Print the PID and program name first. */ | |
printf ("%lu:\t%s\n", (unsigned long int) pid, exe); | |
/* Iterate over the list of objects and print the information. */ | |
struct scratch_buffer tmpbuf; | |
scratch_buffer_init (&tmpbuf); | |
int status = 0; | |
do | |
{ | |
struct E(link_map) m; | |
if (pread64 (memfd, &m, sizeof (m), list) != sizeof (m)) | |
{ | |
error (0, 0, gettext ("cannot read link map")); | |
status = EXIT_FAILURE; | |
goto out; | |
} | |
EW(Addr) name_offset = m.l_name; | |
again: | |
while (1) | |
{ | |
ssize_t n = pread64 (memfd, tmpbuf.data, tmpbuf.length, name_offset); | |
if (n == -1) | |
{ | |
error (0, 0, gettext ("cannot read object name")); | |
status = EXIT_FAILURE; | |
goto out; | |
} | |
if (memchr (tmpbuf.data, '\0', n) != NULL) | |
break; | |
if (!scratch_buffer_grow (&tmpbuf)) | |
{ | |
error (0, 0, gettext ("cannot allocate buffer for object name")); | |
status = EXIT_FAILURE; | |
goto out; | |
} | |
} | |
if (((char *)tmpbuf.data)[0] == '\0' && name_offset == m.l_name | |
&& m.l_libname != 0) | |
{ | |
/* Try the l_libname element. */ | |
struct E(libname_list) ln; | |
if (pread64 (memfd, &ln, sizeof (ln), m.l_libname) == sizeof (ln)) | |
{ | |
name_offset = ln.name; | |
goto again; | |
} | |
} | |
/* Skip over the executable. */ | |
if (((char *)tmpbuf.data)[0] != '\0') | |
printf ("%s\n", (char *)tmpbuf.data); | |
list = m.l_next; | |
} | |
while (list != 0); | |
out: | |
scratch_buffer_free (&tmpbuf); | |
return status; | |
} | |
#undef CLASS |