diff options
Diffstat (limited to 'bfd')
| -rw-r--r-- | bfd/ChangeLog | 5 | ||||
| -rw-r--r-- | bfd/elf-eh-frame.c | 82 |
2 files changed, 42 insertions, 45 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog index fb35f09..15169f2 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,8 @@ +2005-01-17 Richard Sandiford <rsandifo@redhat.com> + + * elf-eh-frame.c (_bfd_elf_discard_section_eh_frame): Use an + assert-style REQUIRE() macro to handle sanity checks. + 2005-01-17 H.J. Lu <hongjiu.lu@intel.com> * dwarf2.c (dwarf2_debug): Move info_ptr_unit to ... diff --git a/bfd/elf-eh-frame.c b/bfd/elf-eh-frame.c index 6e811b3..11cf186 100644 --- a/bfd/elf-eh-frame.c +++ b/bfd/elf-eh-frame.c @@ -1,5 +1,5 @@ /* .eh_frame section optimization. - Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc. + Copyright 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. Written by Jakub Jelinek <jakub@redhat.com>. This file is part of BFD, the Binary File Descriptor library. @@ -207,6 +207,12 @@ _bfd_elf_discard_section_eh_frame bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *), struct elf_reloc_cookie *cookie) { +#define REQUIRE(COND) \ + do \ + if (!(COND)) \ + goto free_no_table; \ + while (0) + bfd_byte *ehbuf = NULL, *buf; bfd_byte *last_cie, *last_fde; struct eh_cie_fde *ent, *last_cie_inf, *this_inf; @@ -238,8 +244,7 @@ _bfd_elf_discard_section_eh_frame /* Read the frame unwind information from abfd. */ - if (!bfd_malloc_and_get_section (abfd, sec, &ehbuf)) - goto free_no_table; + REQUIRE (bfd_malloc_and_get_section (abfd, sec, &ehbuf)); if (sec->size >= 4 && bfd_get_32 (abfd, ehbuf) == 0 @@ -252,8 +257,7 @@ _bfd_elf_discard_section_eh_frame /* If .eh_frame section size doesn't fit into int, we cannot handle it (it would need to use 64-bit .eh_frame format anyway). */ - if (sec->size != (unsigned int) sec->size) - goto free_no_table; + REQUIRE (sec->size == (unsigned int) sec->size); ptr_size = (elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64) ? 8 : 4; @@ -264,17 +268,15 @@ _bfd_elf_discard_section_eh_frame cie_usage_count = 0; sec_info = bfd_zmalloc (sizeof (struct eh_frame_sec_info) + 99 * sizeof (struct eh_cie_fde)); - if (sec_info == NULL) - goto free_no_table; + REQUIRE (sec_info); sec_info->alloced = 100; #define ENSURE_NO_RELOCS(buf) \ - if (cookie->rel < cookie->relend \ - && (cookie->rel->r_offset \ - < (bfd_size_type) ((buf) - ehbuf)) \ - && cookie->rel->r_info != 0) \ - goto free_no_table + REQUIRE (!(cookie->rel < cookie->relend \ + && (cookie->rel->r_offset \ + < (bfd_size_type) ((buf) - ehbuf)) \ + && cookie->rel->r_info != 0)) #define SKIP_RELOCS(buf) \ while (cookie->rel < cookie->relend \ @@ -299,8 +301,7 @@ _bfd_elf_discard_section_eh_frame sizeof (struct eh_frame_sec_info) + ((sec_info->alloced + 99) * sizeof (struct eh_cie_fde))); - if (sec_info == NULL) - goto free_no_table; + REQUIRE (sec_info); memset (&sec_info->entry[sec_info->alloced], 0, 100 * sizeof (struct eh_cie_fde)); @@ -320,27 +321,25 @@ _bfd_elf_discard_section_eh_frame hdr.id = (unsigned int) -1; else { - if ((bfd_size_type) (buf + 4 - ehbuf) > sec->size) - /* No space for CIE/FDE header length. */ - goto free_no_table; - + /* Read the length of the entry. */ + REQUIRE ((bfd_size_type) (buf - ehbuf) + 4 <= sec->size); hdr.length = bfd_get_32 (abfd, buf); - if (hdr.length == 0xffffffff) - /* 64-bit .eh_frame is not supported. */ - goto free_no_table; buf += 4; - if ((bfd_size_type) (buf - ehbuf) + hdr.length > sec->size) - /* CIE/FDE not contained fully in this .eh_frame input section. */ - goto free_no_table; + + /* 64-bit .eh_frame is not supported. */ + REQUIRE (hdr.length != 0xffffffff); + + /* The CIE/FDE must be fully contained in this input section. */ + REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr.length <= sec->size); this_inf->offset = last_fde - ehbuf; this_inf->size = 4 + hdr.length; if (hdr.length == 0) { - /* CIE with length 0 must be only the last in the section. */ - if ((bfd_size_type) (buf - ehbuf) < sec->size) - goto free_no_table; + /* A zero-length CIE should only be found at the end of + the section. */ + REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size); ENSURE_NO_RELOCS (buf); sec_info->count++; /* Now just finish last encountered CIE processing and break @@ -351,8 +350,7 @@ _bfd_elf_discard_section_eh_frame { hdr.id = bfd_get_32 (abfd, buf); buf += 4; - if (hdr.id == (unsigned int) -1) - goto free_no_table; + REQUIRE (hdr.id != (unsigned int) -1); } } @@ -397,10 +395,8 @@ _bfd_elf_discard_section_eh_frame cie.version = *buf++; /* Cannot handle unknown versions. */ - if (cie.version != 1 && cie.version != 3) - goto free_no_table; - if (strlen (buf) > sizeof (cie.augmentation) - 1) - goto free_no_table; + REQUIRE (cie.version == 1 || cie.version == 3); + REQUIRE (strlen (buf) < sizeof (cie.augmentation)); strcpy (cie.augmentation, buf); buf = strchr (buf, '\0') + 1; @@ -440,14 +436,12 @@ _bfd_elf_discard_section_eh_frame case 'L': cie.lsda_encoding = *buf++; ENSURE_NO_RELOCS (buf); - if (get_DW_EH_PE_width (cie.lsda_encoding, ptr_size) == 0) - goto free_no_table; + REQUIRE (get_DW_EH_PE_width (cie.lsda_encoding, ptr_size)); break; case 'R': cie.fde_encoding = *buf++; ENSURE_NO_RELOCS (buf); - if (get_DW_EH_PE_width (cie.fde_encoding, ptr_size) == 0) - goto free_no_table; + REQUIRE (get_DW_EH_PE_width (cie.fde_encoding, ptr_size)); break; case 'P': { @@ -456,8 +450,7 @@ _bfd_elf_discard_section_eh_frame cie.per_encoding = *buf++; per_width = get_DW_EH_PE_width (cie.per_encoding, ptr_size); - if (per_width == 0) - goto free_no_table; + REQUIRE (per_width); if ((cie.per_encoding & 0xf0) == DW_EH_PE_aligned) buf = (ehbuf + ((buf - ehbuf + per_width - 1) @@ -550,14 +543,11 @@ _bfd_elf_discard_section_eh_frame else { /* Ensure this FDE uses the last CIE encountered. */ - if (last_cie == NULL - || hdr.id != (unsigned int) (buf - 4 - last_cie)) - goto free_no_table; + REQUIRE (last_cie); + REQUIRE (hdr.id == (unsigned int) (buf - 4 - last_cie)); ENSURE_NO_RELOCS (buf); - if (GET_RELOC (buf) == NULL) - /* This should not happen. */ - goto free_no_table; + REQUIRE (GET_RELOC (buf)); if ((*reloc_symbol_deleted_p) (buf - ehbuf, cookie)) /* This is a FDE against a discarded section. It should @@ -635,6 +625,8 @@ free_no_table: hdr_info->table = FALSE; hdr_info->last_cie.hdr.length = 0; return FALSE; + +#undef REQUIRE } /* This function is called for .eh_frame_hdr section after |