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security/41: Don't perform PROMPT_SUBST evaluation on %F/%K arguments

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Mitigates CVE-2021-45444

(cherry picked from commit c187154f47)
This commit is contained in:
Oliver Kiddle 2021-12-15 01:56:40 +01:00 committed by dana
parent fc18b7c8a2
commit c3ea1e5d52
2 changed files with 15 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2022-02-12 dana <dana@dana.is>
* Oliver Kiddle: security/41: Src/prompt.c: Prevent recursive
PROMPT_SUBST
2022-02-04 Jun-ichi Takimoto <takimoto-j@kba.biglobe.ne.jp>
* 49730: Completion/Unix/Command/_csplit,

10
Src/prompt.c
View file

@ -244,6 +244,12 @@ parsecolorchar(zattr arg, int is_fg)
bv->fm += 2; /* skip over F{ */
if ((ep = strchr(bv->fm, '}'))) {
char oc = *ep, *col, *coll;
int ops = opts[PROMPTSUBST], opb = opts[PROMPTBANG];
int opp = opts[PROMPTPERCENT];
opts[PROMPTPERCENT] = 1;
opts[PROMPTSUBST] = opts[PROMPTBANG] = 0;
*ep = '\0';
/* expand the contents of the argument so you can use
* %v for example */
@ -252,6 +258,10 @@ parsecolorchar(zattr arg, int is_fg)
arg = match_colour((const char **)&coll, is_fg, 0);
free(col);
bv->fm = ep;
opts[PROMPTSUBST] = ops;
opts[PROMPTBANG] = opb;
opts[PROMPTPERCENT] = opp;
} else {
arg = match_colour((const char **)&bv->fm, is_fg, 0);
if (*bv->fm != '}')