envv segfault with particular output size #1
Description
I know this isn't really your code, but you seem to be the only one working on it.
This error is sensitive to the length of input. Whenever the length of variable plus value, plus added value is 181, I get this error. You can increase the variable name length, as long as you reduce one of the other two strings by the same amount, and so on.
The below examples are contrived, but I found this because a production system encountered this error, causing environment values to not be properly updated.
Demo:
export x=01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
cat <<EOF | ./envv
add x 0
EOF
x=01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678:0; export x
Segmentation fault
Also:
export x=012345678901234567890123456789012345678901234567890123456789012345678901234567890
cat <<EOF | ./envv
add x 012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
EOF
x=012345678901234567890123456789012345678901234567890123456789012345678901234567890:012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678; export x
Segmentation fault
And:
export x0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789=0123456789012345678901234567890123456789012345678901234567890123456789012345678
cat <<EOF | ./envv
add x012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 0
EOF
x012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789=01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678:0; export x012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
Segmentation fault