67 lines
2.6 KiB
Diff
67 lines
2.6 KiB
Diff
From: Alan Modra <amodra@gmail.com>
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Date: Fri, 20 Dec 2013 13:27:52 +0000 (+1030)
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Subject: Don't segv on cie.initial_instructions[] overflow.
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X-Git-Tag: gdb-7.7-release~148
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X-Git-Url: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commitdiff_plain;h=99d190fac4d2aab238cfc798dc5c28ab41456882
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Don't segv on cie.initial_instructions[] overflow.
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Don't attempt to merge CIEs with a larger number of insns than will
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fit in the buffer.
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* elf-eh-frame.c (cie_eq): Return false when initial_insn_length
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is too large.
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(cie_compute_hash): Don't exceed bounds of initial_instructions.
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(_bfd_elf_parse_eh_frame): Always set initial_insn_length, and
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save as much of insns to initial_instructions[] as will fit.
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---
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diff --git a/bfd/elf-eh-frame.c b/bfd/elf-eh-frame.c
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index 832a991..4b6e8ea 100644
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--- a/bfd/elf-eh-frame.c
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+++ b/bfd/elf-eh-frame.c
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@@ -235,6 +235,7 @@ cie_eq (const void *e1, const void *e2)
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&& c1->lsda_encoding == c2->lsda_encoding
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&& c1->fde_encoding == c2->fde_encoding
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&& c1->initial_insn_length == c2->initial_insn_length
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+ && c1->initial_insn_length <= sizeof (c1->initial_instructions)
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&& memcmp (c1->initial_instructions,
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c2->initial_instructions,
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c1->initial_insn_length) == 0)
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@@ -254,6 +255,7 @@ static hashval_t
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cie_compute_hash (struct cie *c)
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{
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hashval_t h = 0;
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+ size_t len;
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h = iterative_hash_object (c->length, h);
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h = iterative_hash_object (c->version, h);
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h = iterative_hash (c->augmentation, strlen (c->augmentation) + 1, h);
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@@ -267,7 +269,10 @@ cie_compute_hash (struct cie *c)
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h = iterative_hash_object (c->lsda_encoding, h);
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h = iterative_hash_object (c->fde_encoding, h);
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h = iterative_hash_object (c->initial_insn_length, h);
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- h = iterative_hash (c->initial_instructions, c->initial_insn_length, h);
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+ len = c->initial_insn_length;
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+ if (len > sizeof (c->initial_instructions))
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+ len = sizeof (c->initial_instructions);
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+ h = iterative_hash (c->initial_instructions, len, h);
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c->hash = h;
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return h;
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}
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@@ -762,11 +767,10 @@ _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info,
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cie->fde_encoding = DW_EH_PE_absptr;
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initial_insn_length = end - buf;
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- if (initial_insn_length <= sizeof (cie->initial_instructions))
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- {
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- cie->initial_insn_length = initial_insn_length;
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- memcpy (cie->initial_instructions, buf, initial_insn_length);
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- }
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+ cie->initial_insn_length = initial_insn_length;
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+ memcpy (cie->initial_instructions, buf,
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+ initial_insn_length <= sizeof (cie->initial_instructions)
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+ ? initial_insn_length : sizeof (cie->initial_instructions));
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insns = buf;
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buf += initial_insn_length;
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ENSURE_NO_RELOCS (buf);
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