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https://github.com/SebastianWendel/nixpkgs.git
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f0b8a113dd
via https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cb5b020a8d38f77209d0472a0fea755299a8ec78 see https://github.com/NixOS/nixpkgs/issues/53672
45 lines
1.4 KiB
Diff
45 lines
1.4 KiB
Diff
From cb5b020a8d38f77209d0472a0fea755299a8ec78 Mon Sep 17 00:00:00 2001
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From: Linus Torvalds <torvalds@linux-foundation.org>
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Date: Thu, 14 Feb 2019 15:02:18 -0800
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Subject: Revert "exec: load_script: don't blindly truncate shebang string"
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This reverts commit 8099b047ecc431518b9bb6bdbba3549bbecdc343.
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It turns out that people do actually depend on the shebang string being
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truncated, and on the fact that an interpreter (like perl) will often
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just re-interpret it entirely to get the full argument list.
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Reported-by: Samuel Dionne-Riel <samuel@dionne-riel.com>
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Acked-by: Kees Cook <keescook@chromium.org>
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Cc: Oleg Nesterov <oleg@redhat.com>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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---
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fs/binfmt_script.c | 10 +++-------
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1 file changed, 3 insertions(+), 7 deletions(-)
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diff --git a/fs/binfmt_script.c b/fs/binfmt_script.c
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index d0078cbb718b..7cde3f46ad26 100644
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--- a/fs/binfmt_script.c
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+++ b/fs/binfmt_script.c
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@@ -42,14 +42,10 @@ static int load_script(struct linux_binprm *bprm)
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fput(bprm->file);
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bprm->file = NULL;
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- for (cp = bprm->buf+2;; cp++) {
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- if (cp >= bprm->buf + BINPRM_BUF_SIZE)
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- return -ENOEXEC;
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- if (!*cp || (*cp == '\n'))
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- break;
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- }
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+ bprm->buf[BINPRM_BUF_SIZE - 1] = '\0';
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+ if ((cp = strchr(bprm->buf, '\n')) == NULL)
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+ cp = bprm->buf+BINPRM_BUF_SIZE-1;
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*cp = '\0';
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-
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while (cp > bprm->buf) {
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cp--;
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if ((*cp == ' ') || (*cp == '\t'))
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--
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cgit 1.2-0.3.lf.el7
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