diff options
| -rw-r--r-- | tools/sed/patches/001-sed-fix-handling-of-symlinks-pointing-to-path-with-1.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/tools/sed/patches/001-sed-fix-handling-of-symlinks-pointing-to-path-with-1.patch b/tools/sed/patches/001-sed-fix-handling-of-symlinks-pointing-to-path-with-1.patch new file mode 100644 index 0000000000..96ae5bdbb9 --- /dev/null +++ b/tools/sed/patches/001-sed-fix-handling-of-symlinks-pointing-to-path-with-1.patch @@ -0,0 +1,47 @@ +From 8f600f2df293d539e9e9137f6f82faa1633b97c1 Mon Sep 17 00:00:00 2001 +From: Paul Eggert <eggert@cs.ucla.edu> +Date: Sat, 17 Dec 2022 20:56:29 -0800 +Subject: [PATCH] sed: fix symlink bufsize readlink check + +Problem reported by Hauke Mehrtens. +* sed/utils.c (follow_symlink): Fix typo when checking size of +second and later symlink, when that symlink is so large that it +does not fit into the buffer. Although the bug is not a buffer +overflow, it does cause sed to mishandle the symlink. +* testsuite/follow-symlinks.sh: Test for the bug. +--- + sed/utils.c | 2 +- + testsuite/follow-symlinks.sh | 13 +++++++++++++ + 3 files changed, 18 insertions(+), 1 deletion(-) + +--- a/sed/utils.c ++++ b/sed/utils.c +@@ -345,7 +345,7 @@ follow_symlink (const char *fname) + while ((linklen = (buf_used < buf_size + ? readlink (fn, buf + buf_used, buf_size - buf_used) + : 0)) +- == buf_size) ++ == buf_size - buf_used) + { + buf = xpalloc (buf, &buf_size, 1, SSIZE_IDX_MAX, 1); + if (num_links) +--- a/testsuite/follow-symlinks.sh ++++ b/testsuite/follow-symlinks.sh +@@ -73,4 +73,17 @@ compare_ exp-la-abs out-la-abs || fail=1 + ln -s la-loop la-loop || framework_failure_ + sed --follow-symlinks -i s/a/b/ la-loop && fail=1 + ++# symlink of length 128 ++long=d/ ++for i in 2 3 4 5 6 7; do ++ long=$long$long ++done ++dir=${long%/d/} ++file=$dir/xx ++mkdir -p $dir && ++echo x >$file && ++ln -s $file yy && ++ln -s yy xx || framework_failure_ ++sed -i --follow-symlinks s/x/y/ xx || fail=1 ++ + Exit $fail |