diff options
Diffstat (limited to 'src/readelf.c')
| -rw-r--r-- | src/readelf.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/readelf.c b/src/readelf.c index 119c1000..da3661c0 100644 --- a/src/readelf.c +++ b/src/readelf.c @@ -42,6 +42,7 @@ #include <unistd.h> #include <sys/param.h> #include <sys/stat.h> +#include <signal.h> #include <system.h> #include "../libelf/libelfP.h" @@ -8616,6 +8617,104 @@ handle_auxv_note (Ebl *ebl, Elf *core, GElf_Word descsz, GElf_Off desc_pos) } } +static bool +buf_has_data (unsigned char const *ptr, unsigned char const *end, size_t sz) +{ + return ptr < end && (size_t) (end - ptr) >= sz; +} + +static bool +buf_read_int (Elf *core, unsigned char const **ptrp, unsigned char const *end, + int *retp) +{ + if (! buf_has_data (*ptrp, end, 4)) + return false; + + *ptrp = convert (core, ELF_T_WORD, 1, retp, *ptrp, 4); + return true; +} + +static bool +buf_read_ulong (Elf *core, unsigned char const **ptrp, unsigned char const *end, + uint64_t *retp) +{ + size_t sz = gelf_fsize (core, ELF_T_ADDR, 1, EV_CURRENT); + if (! buf_has_data (*ptrp, end, sz)) + return false; + + union + { + uint64_t u64; + uint32_t u32; + } u; + + *ptrp = convert (core, ELF_T_ADDR, 1, &u, *ptrp, sizeof u); + + if (sz == 4) + *retp = u.u32; + else + *retp = u.u64; + return true; +} + +static void +handle_siginfo_note (Elf *core, GElf_Word descsz, GElf_Off desc_pos) +{ + Elf_Data *data = elf_getdata_rawchunk (core, desc_pos, descsz, ELF_T_BYTE); + if (data == NULL) + error (EXIT_FAILURE, 0, + gettext ("cannot convert core note data: %s"), elf_errmsg (-1)); + + unsigned char const *ptr = data->d_buf; + unsigned char const *const end = data->d_buf + data->d_size; + + /* Siginfo head is three ints: signal number, error number, origin + code. */ + int si_signo, si_errno, si_code; + if (! buf_read_int (core, &ptr, end, &si_signo) + || ! buf_read_int (core, &ptr, end, &si_errno) + || ! buf_read_int (core, &ptr, end, &si_code)) + { + fail: + printf (" Not enough data in NT_SIGINFO note.\n"); + return; + } + + /* Next is a pointer-aligned union of structures. On 64-bit + machines, that implies a word of padding. */ + if (gelf_getclass (core) == ELFCLASS64) + ptr += 4; + + printf (" si_signo: %d, si_errno: %d, si_code: %d\n", + si_signo, si_errno, si_code); + + if (si_code > 0) + switch (si_signo) + { + case SIGILL: + case SIGFPE: + case SIGSEGV: + case SIGBUS: + { + uint64_t addr; + if (! buf_read_ulong (core, &ptr, end, &addr)) + goto fail; + printf (" fault address: %#" PRIx64 "\n", addr); + break; + } + default: + ; + } + else if (si_code == SI_USER) + { + int pid, uid; + if (! buf_read_int (core, &ptr, end, &pid) + || ! buf_read_int (core, &ptr, end, &uid)) + goto fail; + printf (" sender PID: %d, sender UID: %d\n", pid, uid); + } +} + static void handle_core_note (Ebl *ebl, const GElf_Nhdr *nhdr, const char *name, const void *desc) @@ -8689,6 +8788,10 @@ handle_notes_data (Ebl *ebl, const GElf_Ehdr *ehdr, && !memcmp (name, "CORE", 4)) handle_auxv_note (ebl, ebl->elf, nhdr.n_descsz, start + desc_offset); + else if (nhdr.n_type == NT_SIGINFO + && nhdr.n_namesz == 5 && strcmp (name, "CORE") == 0) + handle_siginfo_note (ebl->elf, nhdr.n_descsz, + start + desc_offset); else handle_core_note (ebl, &nhdr, name, desc); } |