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* [Bug gdb/23743] GDB index file mmapping broken, ubsan => runtime error: load of misaligned address
[not found] <bug-23743-4717@http.sourceware.org/bugzilla/>
@ 2021-03-05 20:09 ` tromey at sourceware dot org
2021-04-17 19:56 ` cvs-commit at gcc dot gnu.org
2021-04-17 19:58 ` tromey at sourceware dot org
2 siblings, 0 replies; 3+ messages in thread
From: tromey at sourceware dot org @ 2021-03-05 20:09 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=23743
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at sourceware dot org |tromey at sourceware dot org
--- Comment #19 from Tom Tromey <tromey at sourceware dot org> ---
I have a patch for this.
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* [Bug gdb/23743] GDB index file mmapping broken, ubsan => runtime error: load of misaligned address
[not found] <bug-23743-4717@http.sourceware.org/bugzilla/>
2021-03-05 20:09 ` [Bug gdb/23743] GDB index file mmapping broken, ubsan => runtime error: load of misaligned address tromey at sourceware dot org
@ 2021-04-17 19:56 ` cvs-commit at gcc dot gnu.org
2021-04-17 19:58 ` tromey at sourceware dot org
2 siblings, 0 replies; 3+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-04-17 19:56 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=23743
--- Comment #20 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom Tromey <tromey@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=42c2c69462fd83db2e0532ee57c44091bc1032f9
commit 42c2c69462fd83db2e0532ee57c44091bc1032f9
Author: Tom Tromey <tom@tromey.com>
Date: Sat Apr 17 13:56:36 2021 -0600
Handle unaligned mapping of .gdb_index
The .gdb_index was designed such that all data would be aligned.
Unfortunately, we neglected to require this alignment in the objcopy
instructions in the manual. As a result, in many cases, a .gdb_index
in the wild will not be properly aligned by mmap. This yields
undefined behavior, which is PR gdb/23743.
This patch fixes the bug by always assuming that the mapping is
unaligned, and using extract_unsigned_integer when needed. A new
helper class is introduced to make this less painful.
gdb/ChangeLog
2021-04-17 Tom Tromey <tom@tromey.com>
PR gdb/23743:
* dwarf2/read.c (class offset_view): New.
(struct symbol_table_slot): Remove.
(struct mapped_index) <symbol_table, constant_pool>: Change type.
<symbol_name_index, symbol_vec_index>: New methods.
<symbol_name_slot_invalid, symbol_name_at, symbol_name_count>:
Rewrite.
(read_gdb_index_from_buffer): Update.
(struct dw2_symtab_iterator) <vec>: Change type.
(dw2_symtab_iter_init_common, dw2_symtab_iter_init)
(dw2_symtab_iter_next, dw2_expand_marked_cus): Update.
* dwarf2/index-write.c (class data_buf) <append_data>: Remove.
<append_array, append_offset>: New methods.
(write_hash_table, add_address_entry, write_gdbindex_1)
(write_debug_names): Update.
* dwarf2/index-common.h (byte_swap, MAYBE_SWAP): Remove.
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* [Bug gdb/23743] GDB index file mmapping broken, ubsan => runtime error: load of misaligned address
[not found] <bug-23743-4717@http.sourceware.org/bugzilla/>
2021-03-05 20:09 ` [Bug gdb/23743] GDB index file mmapping broken, ubsan => runtime error: load of misaligned address tromey at sourceware dot org
2021-04-17 19:56 ` cvs-commit at gcc dot gnu.org
@ 2021-04-17 19:58 ` tromey at sourceware dot org
2 siblings, 0 replies; 3+ messages in thread
From: tromey at sourceware dot org @ 2021-04-17 19:58 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=23743
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |11.1
--- Comment #21 from Tom Tromey <tromey at sourceware dot org> ---
Fixed.
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2021-03-05 20:09 ` [Bug gdb/23743] GDB index file mmapping broken, ubsan => runtime error: load of misaligned address tromey at sourceware dot org
2021-04-17 19:56 ` cvs-commit at gcc dot gnu.org
2021-04-17 19:58 ` tromey at sourceware dot org
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