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initrd: escape_zero: allow some more characters

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Since it's not supposed to be shell safe, just display safe
inside double quotes, we can allow some more characters.

Also fix the escape character not being escaped.
This commit is contained in:
3hhh 2023-01-14 13:14:09 +01:00
parent 2ae7f53e04
commit d07df1e60b
No known key found for this signature in database
GPG Key ID: EB03A691DB2F0833
1 changed files with 13 additions and 11 deletions
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24
initrd/etc/functions
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@ -339,10 +339,11 @@ print_tree() {
find ./ ! -path './kexec*' -print0 | sort -z
}
# Escape zero-delimited standard input for use in shell.
# These characters are passed verbatim: a-zA-Z0-9,._+:@%/-
# These escapes are used to replace their corresponding characters: #n#r#t# #v#b
# Other characters are rendered as hexadecimal escapes
# Escape zero-delimited standard input to safely display it to the user in e.g.
# `whiptail`, `less`, `echo`, `cat`. Doesn't produce shell-escaped output.
# Most printable characters are passed verbatim (exception: \).
# These escapes are used to replace their corresponding characters: #n#r#t#v#b
# Other characters are rendered as hexadecimal escapes.
# escape_zero [prefix] [escape character]
# prefix: \0 in the input will result in \n[prefix]
# escape character: character to use for escapes (default: #); \ may be interpreted by `whiptail`
@ -350,9 +351,11 @@ escape_zero() {
local prefix="$1"
local echar="${2:-#}"
local todo=""
local echar_hex="$(echo -n "$echar" | xxd -p -c1)"
[ ${#echar_hex} -eq 2 ] || die "Invalid escape character $echar passed to escape_zero(). Programming error?!"
echo -e -n "$prefix"
xxd -p | tr -d '\n' |
xxd -p -c1 | tr -d '\n' |
{
while IFS= read -r -n2 -d '' ; do
if [ -n "$todo" ] ; then
@ -380,16 +383,15 @@ escape_zero() {
0d)
echo -n "${echar}r"
;;
20)
echo -n "${echar} "
"$echar_hex")
echo -n "$echar$echar"
;;
#%+,-./ 0-9: @A-0 P-Z_ a-o p-z
2[5b-f]|3[0-9a]|4[0-9a-f]|5[0-9af]|6[1-f]|7[0-9a])
#interpreted characters:
2[0-9a-f]|3[0-9a-f]|4[0-9a-f]|5[0-9abd-f]|6[0-9a-f]|7[0-9a-e])
echo -e -n '\x'"$REPLY"
;;
# All others are escaped
[0-9a-f][0-9a-f])
*)
echo -n "${echar}x$REPLY"
;;
esac