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https://github.com/espressif/binutils-gdb.git
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13f5f57e0d
I noticed that the printf code for strings, printf_c_string and printf_wide_c_string, don't take max-value-size into account, but do load a complete string from the inferior into a GDB buffer. As such it would be possible for an badly behaved inferior to cause GDB to try and allocate an excessively large buffer, potentially crashing GDB, or at least causing GDB to swap lots, which isn't great. We already have a setting to protect against this sort of thing, the 'max-value-size'. So this commit updates the two function mentioned above to check the max-value-size and give an error if the max-value-size is exceeded. If the max-value-size is exceeded, I chose to continue reading inferior memory to figure out how long the string actually is, we just don't store the results. The benefit of this is that when we give the user an error we can tell the user how big the string actually is, which would allow them to correctly adjust max-value-size, if that's what they choose to do. The default for max-value-size is 64k so there should be no user visible changes after this commit, unless the user was previously printing very large strings. If that is the case then the user will now need to increase max-value-size.
33 lines
1.1 KiB
Plaintext
33 lines
1.1 KiB
Plaintext
# Copyright 2023 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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#
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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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#
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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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standard_testfile
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if {[prepare_for_testing "failed to prepare" $testfile $srcfile]} {
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return -1
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}
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if {![runto_main]} {
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return -1
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}
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gdb_test {printf "%ls\n", wide_str} "^wide string"
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# Check that if the max-value-size will kick in when using printf on strings.
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with_max_value_size 20 {
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gdb_test {printf "%ls\n", long_wide_str} \
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"^printed string requires 240 bytes, which is more than max-value-size"
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}
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