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Fix GH-16812: UAF on readline_info() after readline_write_history() c… #16813

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Fix GH-16812: UAF on readline_info() after readline_write_history() c… #16813

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f16a9c7
Fix GH-16812: UAF on readline_info() after readline_write_history() c…
devnexen Nov 15, 2024
df81263
add test
devnexen Nov 15, 2024
1db70c0
changes from feedback, copying original before hand instead.
devnexen Nov 15, 2024
4650692
enable the test on windows
devnexen Nov 15, 2024
ca32a24
enable for the old readline lib too
devnexen Nov 15, 2024
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2 changes: 1 addition & 1 deletion ext/readline/readline.c
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Original file line number Diff line number Diff line change
Expand Up @@ -200,7 +200,7 @@ PHP_FUNCTION(readline_info)
if (rl_line_buffer) {
free(rl_line_buffer);
}
rl_line_buffer = tmp;
oldstr = rl_line_buffer = tmp;
}
#endif
#if !defined(PHP_WIN32)
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19 changes: 19 additions & 0 deletions ext/readline/tests/gh16812.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
--TEST--
GH-16812 readline_info(): UAF
--EXTENSIONS--
readline
--SKIPIF--
<?php
if (READLINE_LIB != "libedit") die("skip libedit only");
if(substr(PHP_OS, 0, 3) == 'WIN' ) {
die('skip not for windows');
}
if (getenv('SKIP_REPEAT')) die("skip readline has global state");
?>
--FILE--
<?php
readline_write_history(NULL);
var_dump(readline_info('line_buffer', 'test'));
?>
--EXPECT--
string(4) "test"
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This doesn't look right; I think readline_info() is supposed to return the old line_buffer which should be an empty string.