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963c77158c
If the absolute path a symlink is pointing to is 128 bytes long sed failed with an error message like this: "<path>/sedstbU8O: Not a directory" This fixes a problem building python seen in the build bot. This patch is on its way into upstream sed. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
48 lines
1.5 KiB
Diff
48 lines
1.5 KiB
Diff
From 8f600f2df293d539e9e9137f6f82faa1633b97c1 Mon Sep 17 00:00:00 2001
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From: Paul Eggert <eggert@cs.ucla.edu>
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Date: Sat, 17 Dec 2022 20:56:29 -0800
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Subject: [PATCH] sed: fix symlink bufsize readlink check
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Problem reported by Hauke Mehrtens.
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* sed/utils.c (follow_symlink): Fix typo when checking size of
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second and later symlink, when that symlink is so large that it
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does not fit into the buffer. Although the bug is not a buffer
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overflow, it does cause sed to mishandle the symlink.
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* testsuite/follow-symlinks.sh: Test for the bug.
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---
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sed/utils.c | 2 +-
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testsuite/follow-symlinks.sh | 13 +++++++++++++
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3 files changed, 18 insertions(+), 1 deletion(-)
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--- a/sed/utils.c
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+++ b/sed/utils.c
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@@ -345,7 +345,7 @@ follow_symlink (const char *fname)
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while ((linklen = (buf_used < buf_size
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? readlink (fn, buf + buf_used, buf_size - buf_used)
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: 0))
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- == buf_size)
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+ == buf_size - buf_used)
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{
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buf = xpalloc (buf, &buf_size, 1, SSIZE_IDX_MAX, 1);
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if (num_links)
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--- a/testsuite/follow-symlinks.sh
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+++ b/testsuite/follow-symlinks.sh
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@@ -73,4 +73,17 @@ compare_ exp-la-abs out-la-abs || fail=1
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ln -s la-loop la-loop || framework_failure_
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sed --follow-symlinks -i s/a/b/ la-loop && fail=1
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+# symlink of length 128
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+long=d/
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+for i in 2 3 4 5 6 7; do
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+ long=$long$long
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+done
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+dir=${long%/d/}
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+file=$dir/xx
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+mkdir -p $dir &&
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+echo x >$file &&
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+ln -s $file yy &&
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+ln -s yy xx || framework_failure_
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+sed -i --follow-symlinks s/x/y/ xx || fail=1
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+
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Exit $fail
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