Commit cb5b020a authored by Linus Torvalds's avatar Linus Torvalds

Revert "exec: load_script: don't blindly truncate shebang string"

This reverts commit 8099b047.

It turns out that people do actually depend on the shebang string being
truncated, and on the fact that an interpreter (like perl) will often
just re-interpret it entirely to get the full argument list.
Reported-by: default avatarSamuel Dionne-Riel <samuel@dionne-riel.com>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 23e93c9b
......@@ -42,14 +42,10 @@ static int load_script(struct linux_binprm *bprm)
fput(bprm->file);
bprm->file = NULL;
for (cp = bprm->buf+2;; cp++) {
if (cp >= bprm->buf + BINPRM_BUF_SIZE)
return -ENOEXEC;
if (!*cp || (*cp == '\n'))
break;
}
bprm->buf[BINPRM_BUF_SIZE - 1] = '\0';
if ((cp = strchr(bprm->buf, '\n')) == NULL)
cp = bprm->buf+BINPRM_BUF_SIZE-1;
*cp = '\0';
while (cp > bprm->buf) {
cp--;
if ((*cp == ' ') || (*cp == '\t'))
......
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