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| author | Alan Modra <amodra@gmail.com> | 2019-12-19 21:46:01 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2019-12-19 21:52:47 +1030 |
| commit | 228c8f4be0c428369ec6b68e25696863d1e62ed7 (patch) | |
| tree | a69cb8af2acba328adf7cf8e59a5ccfab599b288 | |
| parent | f00901886d0acb7a4d4b177a5cabe8bd9ca2307b (diff) | |
| download | gdb-228c8f4be0c428369ec6b68e25696863d1e62ed7.zip gdb-228c8f4be0c428369ec6b68e25696863d1e62ed7.tar.gz gdb-228c8f4be0c428369ec6b68e25696863d1e62ed7.tar.bz2 | |
xcoff slurp_armap bounds checking
"count * 8 >= size" might overflow, "count >= size / 8" doesn't.
* coff-rs6000.c (_bfd_xcoff_slurp_armap): Don't overflow when
checking symbol count against section size. Guard against strlen
running off end of buffer by allocating one more byte and zeroing.
* coff64-rs6000.c (xcoff64_slurp_armap): Likewise.
| -rw-r--r-- | bfd/ChangeLog | 7 | ||||
| -rw-r--r-- | bfd/coff-rs6000.c | 26 | ||||
| -rw-r--r-- | bfd/coff64-rs6000.c | 13 |
3 files changed, 40 insertions, 6 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 302ee5e..dc264de 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,5 +1,12 @@ 2019-12-18 Alan Modra <amodra@gmail.com> + * coff-rs6000.c (_bfd_xcoff_slurp_armap): Don't overflow when + checking symbol count against section size. Guard against strlen + running off end of buffer by allocating one more byte and zeroing. + * coff64-rs6000.c (xcoff64_slurp_armap): Likewise. + +2019-12-18 Alan Modra <amodra@gmail.com> + * elf32-ppc.c (ppc_elf_get_synthetic_symtab): Use size_t for vars. * elf64-ppc.c (sym_exists_at): Use size_t for lo, hi and mid. diff --git a/bfd/coff-rs6000.c b/bfd/coff-rs6000.c index 86cf9e3..995a88a 100644 --- a/bfd/coff-rs6000.c +++ b/bfd/coff-rs6000.c @@ -1260,18 +1260,27 @@ _bfd_xcoff_slurp_armap (bfd *abfd) return FALSE; GET_VALUE_IN_FIELD (sz, hdr.size, 10); + if (sz == (bfd_size_type) -1) + { + bfd_set_error (bfd_error_no_memory); + return FALSE; + } /* Read in the entire symbol table. */ - contents = (bfd_byte *) bfd_alloc (abfd, sz); + contents = (bfd_byte *) bfd_alloc (abfd, sz + 1); if (contents == NULL) return FALSE; if (bfd_bread (contents, sz, abfd) != sz) return FALSE; + /* Ensure strings are NULL terminated so we don't wander off the + end of the buffer. */ + contents[sz] = 0; + /* The symbol table starts with a four byte count. */ c = H_GET_32 (abfd, contents); - if (c * 4 >= sz) + if (c >= sz / 4) { bfd_set_error (bfd_error_bad_value); return FALSE; @@ -1315,18 +1324,27 @@ _bfd_xcoff_slurp_armap (bfd *abfd) return FALSE; GET_VALUE_IN_FIELD (sz, hdr.size, 10); + if (sz == (bfd_size_type) -1) + { + bfd_set_error (bfd_error_no_memory); + return FALSE; + } /* Read in the entire symbol table. */ - contents = (bfd_byte *) bfd_alloc (abfd, sz); + contents = (bfd_byte *) bfd_alloc (abfd, sz + 1); if (contents == NULL) return FALSE; if (bfd_bread (contents, sz, abfd) != sz) return FALSE; + /* Ensure strings are NULL terminated so we don't wander off the + end of the buffer. */ + contents[sz] = 0; + /* The symbol table starts with an eight byte count. */ c = H_GET_64 (abfd, contents); - if (c * 8 >= sz) + if (c >= sz / 8) { bfd_set_error (bfd_error_bad_value); return FALSE; diff --git a/bfd/coff64-rs6000.c b/bfd/coff64-rs6000.c index 091da1f..4db61e5 100644 --- a/bfd/coff64-rs6000.c +++ b/bfd/coff64-rs6000.c @@ -1933,18 +1933,27 @@ xcoff64_slurp_armap (bfd *abfd) return FALSE; sz = bfd_scan_vma (hdr.size, (const char **) NULL, 10); + if (sz == (bfd_size_type) -1) + { + bfd_set_error (bfd_error_no_memory); + return FALSE; + } /* Read in the entire symbol table. */ - contents = (bfd_byte *) bfd_alloc (abfd, sz); + contents = (bfd_byte *) bfd_alloc (abfd, sz + 1); if (contents == NULL) return FALSE; if (bfd_bread (contents, sz, abfd) != sz) return FALSE; + /* Ensure strings are NULL terminated so we don't wander off the end + of the buffer. */ + contents[sz] = 0; + /* The symbol table starts with an eight byte count. */ c = H_GET_64 (abfd, contents); - if (c * 8 >= sz) + if (c >= sz / 8) { bfd_set_error (bfd_error_bad_value); return FALSE; |