223 lines
5.9 KiB
C
223 lines
5.9 KiB
C
/* Copyright (C) 2011-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define E(name) E_(name, CLASS)
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#define E_(name, cl) E__(name, cl)
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#define E__(name, cl) name##cl
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#define EW(type) EW_(Elf, CLASS, type)
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#define EW_(e, w, t) EW__(e, w, _##t)
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#define EW__(e, w, t) e##w##t
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#include <dl-r_debug.h>
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struct E(link_map)
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{
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EW(Addr) l_addr;
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EW(Addr) l_name;
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EW(Addr) l_ld;
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EW(Addr) l_next;
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EW(Addr) l_prev;
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EW(Addr) l_real;
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Lmid_t l_ns;
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EW(Addr) l_libname;
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};
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#if CLASS == __ELF_NATIVE_CLASS
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_Static_assert (offsetof (struct link_map, l_addr)
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== offsetof (struct E(link_map), l_addr), "l_addr");
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_Static_assert (offsetof (struct link_map, l_name)
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== offsetof (struct E(link_map), l_name), "l_name");
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_Static_assert (offsetof (struct link_map, l_next)
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== offsetof (struct E(link_map), l_next), "l_next");
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#endif
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struct E(libname_list)
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{
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EW(Addr) name;
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EW(Addr) next;
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};
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#if CLASS == __ELF_NATIVE_CLASS
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_Static_assert (offsetof (struct libname_list, name)
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== offsetof (struct E(libname_list), name), "name");
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_Static_assert (offsetof (struct libname_list, next)
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== offsetof (struct E(libname_list), next), "next");
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#endif
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struct E(r_debug)
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{
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int r_version;
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#if CLASS == 64
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int pad;
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#endif
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EW(Addr) r_map;
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};
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#if CLASS == __ELF_NATIVE_CLASS
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_Static_assert (offsetof (struct r_debug, r_version)
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== offsetof (struct E(r_debug), r_version), "r_version");
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_Static_assert (offsetof (struct r_debug, r_map)
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== offsetof (struct E(r_debug), r_map), "r_map");
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#endif
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static int
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E(find_maps) (const char *exe, int memfd, pid_t pid, void *auxv,
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size_t auxv_size)
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{
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EW(Addr) phdr = 0;
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unsigned int phnum = 0;
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unsigned int phent = 0;
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EW(auxv_t) *auxvXX = (EW(auxv_t) *) auxv;
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for (int i = 0; i < auxv_size / sizeof (EW(auxv_t)); ++i)
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switch (auxvXX[i].a_type)
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{
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case AT_PHDR:
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phdr = auxvXX[i].a_un.a_val;
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break;
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case AT_PHNUM:
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phnum = auxvXX[i].a_un.a_val;
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break;
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case AT_PHENT:
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phent = auxvXX[i].a_un.a_val;
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break;
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default:
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break;
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}
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if (phdr == 0 || phnum == 0 || phent == 0)
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error (EXIT_FAILURE, 0, gettext ("cannot find program header of process"));
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EW(Phdr) *p = xmalloc (phnum * phent);
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if (pread (memfd, p, phnum * phent, phdr) != phnum * phent)
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error (EXIT_FAILURE, 0, gettext ("cannot read program header"));
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/* Determine the load offset. We need this for interpreting the
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other program header entries so we do this in a separate loop.
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Fortunately it is the first time unless someone does something
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stupid when linking the application. */
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EW(Addr) offset = 0;
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for (unsigned int i = 0; i < phnum; ++i)
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if (p[i].p_type == PT_PHDR)
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{
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offset = phdr - p[i].p_vaddr;
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break;
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}
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EW(Addr) list = 0;
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char *interp = NULL;
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for (unsigned int i = 0; i < phnum; ++i)
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if (p[i].p_type == PT_DYNAMIC)
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{
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EW(Dyn) *dyn = xmalloc (p[i].p_filesz);
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if (pread (memfd, dyn, p[i].p_filesz, offset + p[i].p_vaddr)
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!= p[i].p_filesz)
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error (EXIT_FAILURE, 0, gettext ("cannot read dynamic section"));
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/* Search for the struct r_debug. */
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for (unsigned int j = 0; j < p[i].p_filesz / sizeof (EW(Dyn)); ++j)
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{
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EW(Addr) off = offset + p[i].p_vaddr + sizeof (EW(Dyn)) * j;
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off = E(r_debug_offset) (&dyn[j], memfd, off);
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if (off != 0)
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{
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struct E(r_debug) r;
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if (pread (memfd, &r, sizeof (r), off)
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!= sizeof (r))
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error (EXIT_FAILURE, 0, gettext ("cannot read r_debug"));
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if (r.r_map != 0)
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{
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list = r.r_map;
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break;
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}
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}
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}
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free (dyn);
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break;
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}
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else if (p[i].p_type == PT_INTERP)
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{
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interp = xmalloc (p[i].p_filesz);
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if (pread (memfd, interp, p[i].p_filesz, offset + p[i].p_vaddr)
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!= p[i].p_filesz)
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error (EXIT_FAILURE, 0, gettext ("cannot read program interpreter"));
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}
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if (list == 0)
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{
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if (interp == NULL)
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{
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// XXX check whether the executable itself is the loader
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exit (EXIT_FAILURE);
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}
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// XXX perhaps try finding ld.so and _r_debug in it
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exit (EXIT_FAILURE);
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}
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free (p);
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free (interp);
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/* Print the PID and program name first. */
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printf ("%lu:\t%s\n", (unsigned long int) pid, exe);
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/* Iterate over the list of objects and print the information. */
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struct scratch_buffer tmpbuf;
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scratch_buffer_init (&tmpbuf);
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int status = 0;
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do
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{
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struct E(link_map) m;
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if (pread (memfd, &m, sizeof (m), list) != sizeof (m))
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error (EXIT_FAILURE, 0, gettext ("cannot read link map"));
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EW(Addr) name_offset = m.l_name;
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while (1)
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{
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ssize_t n = pread (memfd, tmpbuf.data, tmpbuf.length, name_offset);
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if (n == -1)
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error (EXIT_FAILURE, 0, gettext ("cannot read object name"));
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if (memchr (tmpbuf.data, '\0', n) != NULL)
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break;
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if (!scratch_buffer_grow (&tmpbuf))
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error (EXIT_FAILURE, 0,
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gettext ("cannot allocate buffer for object name"));
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}
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/* The m.l_name and m.l_libname.name for loader linkmap points to same
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values (since BZ#387 fix). Trying to use l_libname name as the
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shared object name might lead to an infinite loop (BZ#18035). */
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/* Skip over the executable. */
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if (((char *)tmpbuf.data)[0] != '\0')
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printf ("%s\n", (char *)tmpbuf.data);
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list = m.l_next;
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}
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while (list != 0);
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scratch_buffer_free (&tmpbuf);
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return status;
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}
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#undef CLASS
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