diff options
Diffstat (limited to 'REORG.TODO/elf/pldd-xx.c')
| -rw-r--r-- | REORG.TODO/elf/pldd-xx.c | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/REORG.TODO/elf/pldd-xx.c b/REORG.TODO/elf/pldd-xx.c new file mode 100644 index 0000000000..5ce0bce4c9 --- /dev/null +++ b/REORG.TODO/elf/pldd-xx.c @@ -0,0 +1,251 @@ +/* Copyright (C) 2011-2017 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 |