Fix crash on Python frame filters with unreadable arg
https://bugzilla.redhat.com/show_bug.cgi?id=1126177 ERROR: AddressSanitizer: SEGV on unknown address 0x000000000050 (pc 0x000000992bef sp 0x7ffff9039530 bp 0x7ffff9039540 T0) #0 0x992bee in value_type .../gdb/value.c:925 #1 0x87c951 in py_print_single_arg python/py-framefilter.c:445 #2 0x87cfae in enumerate_args python/py-framefilter.c:596 #3 0x87e0b0 in py_print_args python/py-framefilter.c:968 It crashes because frame_arg::val is documented it may contain NULL (frame_arg::error is then non-NULL) but the code does not handle it. Another bug is that py_print_single_arg() calls goto out of its TRY_CATCH which messes up GDB cleanup chain crashing GDB later. It is probably 7.7 regression (I have not verified it) due to the introduction of Python frame filters. gdb/ChangeLog PR python/17355 * python/py-framefilter.c (py_print_single_arg): Handle NULL FA->VAL. Fix goto out of TRY_CATCH. gdb/testsuite/ChangeLog PR python/17355 * gdb.python/amd64-py-framefilter-invalidarg.S: New file. * gdb.python/py-framefilter-invalidarg-gdb.py.in: New file. * gdb.python/py-framefilter-invalidarg.exp: New file. * gdb.python/py-framefilter-invalidarg.py: New file.
This commit is contained in:
Jan Kratochvil
parent
3f9d8762a4
commit
c75bd3a239
7 changed files with 467 additions and 15 deletions
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@ -1,3 +1,9 @@
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2014-09-07 Jan Kratochvil <jan.kratochvil@redhat.com>
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PR python/17355
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* python/py-framefilter.c (py_print_single_arg): Handle NULL FA->VAL.
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Fix goto out of TRY_CATCH.
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2014-09-06 Doug Evans <xdje42@gmail.com>
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Tom Tromey <tromey@redhat.com>
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@ -365,9 +365,12 @@ py_print_single_arg (struct ui_out *out,
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{
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struct value *val;
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volatile struct gdb_exception except;
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enum ext_lang_bt_status retval = EXT_LANG_BT_OK;
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if (fa != NULL)
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{
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if (fa->val == NULL && fa->error == NULL)
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return EXT_LANG_BT_OK;
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language = language_def (SYMBOL_LANGUAGE (fa->sym));
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val = fa->val;
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}
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@ -433,16 +436,18 @@ py_print_single_arg (struct ui_out *out,
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/* For MI print the type, but only for simple values. This seems
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weird, but this is how MI choose to format the various output
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types. */
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if (args_type == MI_PRINT_SIMPLE_VALUES)
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if (args_type == MI_PRINT_SIMPLE_VALUES && val != NULL)
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{
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if (py_print_type (out, val) == EXT_LANG_BT_ERROR)
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{
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retval = EXT_LANG_BT_ERROR;
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do_cleanups (cleanups);
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goto error;
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continue;
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}
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}
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annotate_arg_value (value_type (val));
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if (val != NULL)
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annotate_arg_value (value_type (val));
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/* If the output is to the CLI, and the user option "set print
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frame-arguments" is set to none, just output "...". */
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@ -454,27 +459,25 @@ py_print_single_arg (struct ui_out *out,
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for the case of MI_PRINT_NO_VALUES. */
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if (args_type != NO_VALUES)
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{
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if (py_print_value (out, val, opts, 0, args_type, language)
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== EXT_LANG_BT_ERROR)
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if (val == NULL)
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{
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do_cleanups (cleanups);
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goto error;
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gdb_assert (fa != NULL && fa->error != NULL);
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ui_out_field_fmt (out, "value",
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_("<error reading variable: %s>"),
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fa->error);
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}
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else if (py_print_value (out, val, opts, 0, args_type, language)
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== EXT_LANG_BT_ERROR)
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retval = EXT_LANG_BT_ERROR;
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}
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}
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do_cleanups (cleanups);
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}
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if (except.reason < 0)
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{
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gdbpy_convert_exception (except);
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goto error;
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}
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gdbpy_convert_exception (except);
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return EXT_LANG_BT_OK;
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error:
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return EXT_LANG_BT_ERROR;
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return retval;
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}
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/* Helper function to loop over frame arguments provided by the
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@ -1,3 +1,11 @@
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2014-09-07 Jan Kratochvil <jan.kratochvil@redhat.com>
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PR python/17355
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* gdb.python/amd64-py-framefilter-invalidarg.S: New file.
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* gdb.python/py-framefilter-invalidarg-gdb.py.in: New file.
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* gdb.python/py-framefilter-invalidarg.exp: New file.
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* gdb.python/py-framefilter-invalidarg.py: New file.
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2014-09-06 Doug Evans <xdje42@gmail.com>
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PR 15276
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261
gdb/testsuite/gdb.python/amd64-py-framefilter-invalidarg.S
Normal file
261
gdb/testsuite/gdb.python/amd64-py-framefilter-invalidarg.S
Normal file
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@ -0,0 +1,261 @@
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/* This testcase is part of GDB, the GNU debugger.
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Copyright 2014 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This file is compiled from a single line
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int main (int argc, char **argv) { return 0; }
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using -g -dA -S -O2 and patched as #if-ed below. */
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.file "py-framefilter-invalidarg.c"
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.text
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.Ltext0:
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.globl main
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.type main, @function
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main:
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.LFB0:
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.file 1 "py-framefilter-invalidarg.c"
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# py-framefilter-invalidarg.c:1
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.loc 1 1 0
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.cfi_startproc
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# BLOCK 2 seq:0
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# PRED: ENTRY (FALLTHRU)
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pushq %rbp
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.cfi_def_cfa_offset 16
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.cfi_offset 6, -16
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movq %rsp, %rbp
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.cfi_def_cfa_register 6
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movl %edi, -4(%rbp)
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movq %rsi, -16(%rbp)
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# py-framefilter-invalidarg.c:2
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.loc 1 2 0
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movl $0, %eax
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# py-framefilter-invalidarg.c:3
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.loc 1 3 0
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popq %rbp
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.cfi_def_cfa 7, 8
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# SUCC: EXIT [100.0%]
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ret
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.cfi_endproc
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.LFE0:
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.size main, .-main
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.Letext0:
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.section .debug_info,"",@progbits
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.Ldebug_info0:
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.long .Le - .Ls # Length of Compilation Unit Info
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.Ls:
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.value 0x4 # DWARF version number
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.long .Ldebug_abbrev0 # Offset Into Abbrev. Section
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.byte 0x8 # Pointer Size (in bytes)
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.uleb128 0x1 # (DIE (0xb) DW_TAG_compile_unit)
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.long .LASF3 # DW_AT_producer: "GNU C 4.9.1 20140813 (Red Hat 4.9.1-7) -mtune=generic -march=x86-64 -g"
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.byte 0x1 # DW_AT_language
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.long .LASF4 # DW_AT_name: "py-framefilter-invalidarg.c"
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.long .LASF5 # DW_AT_comp_dir: ""
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.quad .Ltext0 # DW_AT_low_pc
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.quad .Letext0-.Ltext0 # DW_AT_high_pc
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.long .Ldebug_line0 # DW_AT_stmt_list
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die2d:
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.uleb128 0x2 # (DIE (0x2d) DW_TAG_subprogram)
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# DW_AT_external
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.long .LASF6 # DW_AT_name: "main"
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.byte 0x1 # DW_AT_decl_file (py-framefilter-invalidarg.c)
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.byte 0x1 # DW_AT_decl_line
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# DW_AT_prototyped
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.long die6b-.Ldebug_info0 # DW_AT_type
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.quad .LFB0 # DW_AT_low_pc
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.quad .LFE0-.LFB0 # DW_AT_high_pc
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.uleb128 0x1 # DW_AT_frame_base
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.byte 0x9c # DW_OP_call_frame_cfa
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# DW_AT_GNU_all_call_sites
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die4e:
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.uleb128 0x3 # (DIE (0x4e) DW_TAG_formal_parameter)
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.long .LASF0 # DW_AT_name: "argc"
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.byte 0x1 # DW_AT_decl_file (py-framefilter-invalidarg.c)
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.byte 0x1 # DW_AT_decl_line
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.long die6b-.Ldebug_info0 # DW_AT_type
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#if 0
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.uleb128 0x2 # DW_AT_location
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.byte 0x91 # DW_OP_fbreg
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.sleb128 -20
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#endif
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#if 0
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.uleb128 1f - 2f # DW_AT_location
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2:
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.byte 0x03 # DW_OP_addr
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.quad 0
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1:
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#endif
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#if 1
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.uleb128 1f - 2f # DW_AT_location
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2:
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.byte 0x13 # DW_OP_drop
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.quad 0
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1:
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#endif
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die5c:
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.uleb128 0x3 # (DIE (0x5c) DW_TAG_formal_parameter)
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.long .LASF1 # DW_AT_name: "argv"
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.byte 0x1 # DW_AT_decl_file (py-framefilter-invalidarg.c)
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.byte 0x1 # DW_AT_decl_line
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.long die72-.Ldebug_info0 # DW_AT_type
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.uleb128 0x2 # DW_AT_location
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.byte 0x91 # DW_OP_fbreg
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.sleb128 -32
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.byte 0 # end of children of DIE 0x2d
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die6b:
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.uleb128 0x4 # (DIE (0x6b) DW_TAG_base_type)
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.byte 0x4 # DW_AT_byte_size
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.byte 0x5 # DW_AT_encoding
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.ascii "int\0" # DW_AT_name
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die72:
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.uleb128 0x5 # (DIE (0x72) DW_TAG_pointer_type)
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.byte 0x8 # DW_AT_byte_size
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.long die78-.Ldebug_info0 # DW_AT_type
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die78:
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.uleb128 0x5 # (DIE (0x78) DW_TAG_pointer_type)
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.byte 0x8 # DW_AT_byte_size
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.long die7e-.Ldebug_info0 # DW_AT_type
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die7e:
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.uleb128 0x6 # (DIE (0x7e) DW_TAG_base_type)
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.byte 0x1 # DW_AT_byte_size
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.byte 0x6 # DW_AT_encoding
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.long .LASF2 # DW_AT_name: "char"
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.byte 0 # end of children of DIE 0xb
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.Le:
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.section .debug_abbrev,"",@progbits
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.Ldebug_abbrev0:
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.uleb128 0x1 # (abbrev code)
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.uleb128 0x11 # (TAG: DW_TAG_compile_unit)
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.byte 0x1 # DW_children_yes
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.uleb128 0x25 # (DW_AT_producer)
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.uleb128 0xe # (DW_FORM_strp)
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.uleb128 0x13 # (DW_AT_language)
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.uleb128 0xb # (DW_FORM_data1)
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.uleb128 0x3 # (DW_AT_name)
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.uleb128 0xe # (DW_FORM_strp)
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.uleb128 0x1b # (DW_AT_comp_dir)
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.uleb128 0xe # (DW_FORM_strp)
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.uleb128 0x11 # (DW_AT_low_pc)
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.uleb128 0x1 # (DW_FORM_addr)
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.uleb128 0x12 # (DW_AT_high_pc)
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.uleb128 0x7 # (DW_FORM_data8)
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.uleb128 0x10 # (DW_AT_stmt_list)
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.uleb128 0x17 # (DW_FORM_sec_offset)
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.byte 0
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.byte 0
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.uleb128 0x2 # (abbrev code)
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.uleb128 0x2e # (TAG: DW_TAG_subprogram)
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.byte 0x1 # DW_children_yes
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.uleb128 0x3f # (DW_AT_external)
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.uleb128 0x19 # (DW_FORM_flag_present)
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.uleb128 0x3 # (DW_AT_name)
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.uleb128 0xe # (DW_FORM_strp)
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.uleb128 0x3a # (DW_AT_decl_file)
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.uleb128 0xb # (DW_FORM_data1)
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.uleb128 0x3b # (DW_AT_decl_line)
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.uleb128 0xb # (DW_FORM_data1)
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.uleb128 0x27 # (DW_AT_prototyped)
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.uleb128 0x19 # (DW_FORM_flag_present)
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.uleb128 0x49 # (DW_AT_type)
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.uleb128 0x13 # (DW_FORM_ref4)
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.uleb128 0x11 # (DW_AT_low_pc)
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.uleb128 0x1 # (DW_FORM_addr)
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.uleb128 0x12 # (DW_AT_high_pc)
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.uleb128 0x7 # (DW_FORM_data8)
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.uleb128 0x40 # (DW_AT_frame_base)
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.uleb128 0x18 # (DW_FORM_exprloc)
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.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
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.uleb128 0x19 # (DW_FORM_flag_present)
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.byte 0
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.byte 0
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.uleb128 0x3 # (abbrev code)
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.uleb128 0x5 # (TAG: DW_TAG_formal_parameter)
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.byte 0 # DW_children_no
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.uleb128 0x3 # (DW_AT_name)
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.uleb128 0xe # (DW_FORM_strp)
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.uleb128 0x3a # (DW_AT_decl_file)
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.uleb128 0xb # (DW_FORM_data1)
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.uleb128 0x3b # (DW_AT_decl_line)
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.uleb128 0xb # (DW_FORM_data1)
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.uleb128 0x49 # (DW_AT_type)
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.uleb128 0x13 # (DW_FORM_ref4)
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.uleb128 0x2 # (DW_AT_location)
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.uleb128 0x18 # (DW_FORM_exprloc)
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.byte 0
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.byte 0
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.uleb128 0x4 # (abbrev code)
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.uleb128 0x24 # (TAG: DW_TAG_base_type)
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.byte 0 # DW_children_no
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.uleb128 0xb # (DW_AT_byte_size)
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.uleb128 0xb # (DW_FORM_data1)
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.uleb128 0x3e # (DW_AT_encoding)
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.uleb128 0xb # (DW_FORM_data1)
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.uleb128 0x3 # (DW_AT_name)
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.uleb128 0x8 # (DW_FORM_string)
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.byte 0
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.byte 0
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.uleb128 0x5 # (abbrev code)
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.uleb128 0xf # (TAG: DW_TAG_pointer_type)
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.byte 0 # DW_children_no
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.uleb128 0xb # (DW_AT_byte_size)
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.uleb128 0xb # (DW_FORM_data1)
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.uleb128 0x49 # (DW_AT_type)
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.uleb128 0x13 # (DW_FORM_ref4)
|
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.byte 0
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.byte 0
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.uleb128 0x6 # (abbrev code)
|
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.uleb128 0x24 # (TAG: DW_TAG_base_type)
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.byte 0 # DW_children_no
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.uleb128 0xb # (DW_AT_byte_size)
|
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.uleb128 0xb # (DW_FORM_data1)
|
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.uleb128 0x3e # (DW_AT_encoding)
|
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.uleb128 0xb # (DW_FORM_data1)
|
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.uleb128 0x3 # (DW_AT_name)
|
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.uleb128 0xe # (DW_FORM_strp)
|
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.byte 0
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.byte 0
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.byte 0
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.section .debug_aranges,"",@progbits
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.long 0x2c # Length of Address Ranges Info
|
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.value 0x2 # DWARF Version
|
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.long .Ldebug_info0 # Offset of Compilation Unit Info
|
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.byte 0x8 # Size of Address
|
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.byte 0 # Size of Segment Descriptor
|
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.value 0 # Pad to 16 byte boundary
|
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.value 0
|
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.quad .Ltext0 # Address
|
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.quad .Letext0-.Ltext0 # Length
|
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.quad 0
|
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.quad 0
|
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.section .debug_line,"",@progbits
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.Ldebug_line0:
|
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.section .debug_str,"MS",@progbits,1
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.LASF1:
|
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.string "argv"
|
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.LASF4:
|
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.string "py-framefilter-invalidarg.c"
|
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.LASF5:
|
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.string ""
|
||||
.LASF0:
|
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.string "argc"
|
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.LASF3:
|
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.string "GNU C 4.9.1 20140813 (Red Hat 4.9.1-7) -mtune=generic -march=x86-64 -g"
|
||||
.LASF6:
|
||||
.string "main"
|
||||
.LASF2:
|
||||
.string "char"
|
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.ident "GCC: (GNU) 4.9.1 20140813 (Red Hat 4.9.1-7)"
|
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.section .note.GNU-stack,"",@progbits
|
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48
gdb/testsuite/gdb.python/py-framefilter-invalidarg-gdb.py.in
Normal file
48
gdb/testsuite/gdb.python/py-framefilter-invalidarg-gdb.py.in
Normal file
|
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@ -0,0 +1,48 @@
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# Copyright (C) 2014 Free Software Foundation, Inc.
|
||||
|
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# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 3 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
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|
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# This file is part of the GDB testsuite. It tests Python-based
|
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# frame-filters.
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import gdb
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import itertools
|
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from gdb.FrameDecorator import FrameDecorator
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|
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|
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class FrameObjFile ():
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|
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def __init__ (self):
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||||
self.name = "Filter1"
|
||||
self.priority = 1
|
||||
self.enabled = False
|
||||
gdb.current_progspace().frame_filters ["Progspace" + self.name] = self
|
||||
gdb.current_objfile().frame_filters ["ObjectFile" + self.name] = self
|
||||
|
||||
def filter (self, frame_iter):
|
||||
return frame_iter
|
||||
|
||||
class FrameObjFile2 ():
|
||||
|
||||
def __init__ (self):
|
||||
self.name = "Filter2"
|
||||
self.priority = 100
|
||||
self.enabled = True
|
||||
gdb.current_progspace().frame_filters ["Progspace" + self.name] = self
|
||||
gdb.current_objfile().frame_filters ["ObjectFile" + self.name] = self
|
||||
|
||||
def filter (self, frame_iter):
|
||||
return frame_iter
|
||||
|
||||
FrameObjFile()
|
||||
FrameObjFile2()
|
||||
67
gdb/testsuite/gdb.python/py-framefilter-invalidarg.exp
Normal file
67
gdb/testsuite/gdb.python/py-framefilter-invalidarg.exp
Normal file
|
|
@ -0,0 +1,67 @@
|
|||
# Copyright (C) 2014 Free Software Foundation, Inc.
|
||||
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 3 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
load_lib gdb-python.exp
|
||||
|
||||
standard_testfile amd64-py-framefilter-invalidarg.S
|
||||
|
||||
if { ![istarget x86_64-*-* ] || ![is_lp64_target] } {
|
||||
verbose "Skipping py-framefilter-invalidarg."
|
||||
return
|
||||
}
|
||||
|
||||
# We cannot use prepare_for_testing as we have to set the safe-patch
|
||||
# to check objfile and progspace printers.
|
||||
if {[build_executable $testfile.exp $testfile $srcfile {}] == -1} {
|
||||
return -1
|
||||
}
|
||||
|
||||
# Start with a fresh gdb.
|
||||
gdb_exit
|
||||
gdb_start
|
||||
|
||||
# Skip all tests if Python scripting is not enabled.
|
||||
if { [skip_python_tests] } { continue }
|
||||
|
||||
# Make the -gdb.py script available to gdb, it is automagically loaded by gdb.
|
||||
# Care is taken to put it in the same directory as the binary so that
|
||||
# gdb will find it.
|
||||
set remote_obj_python_file \
|
||||
[remote_download \
|
||||
host ${srcdir}/${subdir}/${testfile}-gdb.py.in \
|
||||
[standard_output_file ${testfile}-gdb.py]]
|
||||
|
||||
gdb_reinitialize_dir $srcdir/$subdir
|
||||
gdb_test_no_output "set auto-load safe-path ${remote_obj_python_file}" \
|
||||
"set auto-load safe-path"
|
||||
gdb_load ${binfile}
|
||||
# Verify gdb loaded the script.
|
||||
gdb_test "info auto-load python-scripts" "Yes.*/${testfile}-gdb.py.*" \
|
||||
"Test auto-load had loaded python scripts"
|
||||
|
||||
if ![runto_main] then {
|
||||
perror "couldn't run to breakpoint"
|
||||
return
|
||||
}
|
||||
gdb_test_no_output "set python print-stack full" \
|
||||
"Set python print-stack to full"
|
||||
|
||||
# Load global frame-filters
|
||||
set remote_python_file [gdb_remote_download host \
|
||||
${srcdir}/${subdir}/${testfile}.py]
|
||||
gdb_test_no_output "python exec (open ('${remote_python_file}').read ())" \
|
||||
"Load python file"
|
||||
|
||||
gdb_test "bt" " in niam \\(argc=<error reading variable: dwarf expression stack underflow>, argv=0x\[0-9a-f\]+\\) at py-framefilter-invalidarg.c:\[0-9\]+" "bt full with filters"
|
||||
59
gdb/testsuite/gdb.python/py-framefilter-invalidarg.py
Normal file
59
gdb/testsuite/gdb.python/py-framefilter-invalidarg.py
Normal file
|
|
@ -0,0 +1,59 @@
|
|||
# Copyright (C) 2014 Free Software Foundation, Inc.
|
||||
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 3 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
# This file is part of the GDB testsuite. It tests Python-based
|
||||
# frame-filters.
|
||||
import gdb
|
||||
import itertools
|
||||
from gdb.FrameDecorator import FrameDecorator
|
||||
import copy
|
||||
|
||||
class Reverse_Function (FrameDecorator):
|
||||
|
||||
def __init__(self, fobj):
|
||||
super(Reverse_Function, self).__init__(fobj)
|
||||
self.fobj = fobj
|
||||
|
||||
def function (self):
|
||||
fname = str (self.fobj.function())
|
||||
if (fname == None or fname == ""):
|
||||
return None
|
||||
if fname == 'end_func':
|
||||
extra = self.fobj.inferior_frame().read_var('str').string()
|
||||
else:
|
||||
extra = ''
|
||||
fname = fname[::-1] + extra
|
||||
return fname
|
||||
|
||||
class FrameFilter ():
|
||||
|
||||
def __init__ (self):
|
||||
self.name = "Reverse"
|
||||
self.priority = 100
|
||||
self.enabled = True
|
||||
gdb.frame_filters [self.name] = self
|
||||
|
||||
def filter (self, frame_iter):
|
||||
# Python 3.x moved the itertools.imap functionality to map(),
|
||||
# so check if it is available.
|
||||
if hasattr(itertools, "imap"):
|
||||
frame_iter = itertools.imap (Reverse_Function,
|
||||
frame_iter)
|
||||
else:
|
||||
frame_iter = map(Reverse_Function, frame_iter)
|
||||
|
||||
return frame_iter
|
||||
|
||||
FrameFilter()
|
||||
Loading…
Add table
Reference in a new issue