On 5/28/24 20:41, Tomas Kalibera wrote:
On 5/28/24 19:35, Hadley Wickham wrote:
Hi all,
When I run the following code, R segfaults:
text <- "×"
srcfile <- srcfilecopy("test.r", text)
parse(textConnection(text), srcfile = srcfile)
It doesn't segfault if text is ASCII, or it's not wrapped in
textConnection, or srcfile isn't set.
Thanks, this is because R parser doesn't support non-ASCII UTF-8
outside string literals and comments, plus a missing bounds check. The
"correct" result should be an R error, which I get in a debug build.
To be more precise, the current implementation of the parser allows a
bit more than that, but there are recommendations in WRE 1.1.5 "Package
subdirectories" on (not) using non-ASCII characters in packages.
"×" (\ud7) is not an allowed symbol name and the current implementation
should throw an error.
The tokenizer ends up with a negative token and then when the parse
data are being finalized, creating a table of token names, there is an
out of bounds access (yytname array). Probably the check should go
right away into the tokenizer.
Fixed in R-devel.
Tomas
Tomas
Hadley
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