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| author | Andrew Gregory <andrew.gregory.8@gmail.com> | 2017-04-09 19:49:17 -0400 |
|---|---|---|
| committer | Andrew Gregory <andrew.gregory.8@gmail.com> | 2017-04-16 19:41:35 -0400 |
| commit | 16b91f798faf6413f9b043543c5c0c3467b6fdbf (patch) | |
| tree | 929d4406c6fe65d234bb5239dd6b027cedd80654 | |
| parent | f9de3b22ad9e532af14c8d5b0b90a3f0f747e331 (diff) | |
| download | pacman-16b91f798faf6413f9b043543c5c0c3467b6fdbf.tar.xz | |
unlink_file: strip trailing slashes
If the user replaces a directory with a symlink, libalpm would get
confused because the trailing slash causes system calls to resolve the
symlink. This leads to errors and a misleading message during upgrades.
Even though libalpm does not support this, it should not be giving
misleading errors.
Also adds an overflow check.
Fixes FS#51377
Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
| -rw-r--r-- | lib/libalpm/remove.c | 13 | ||||
| -rw-r--r-- | test/pacman/tests/TESTS | 1 | ||||
| -rw-r--r-- | test/pacman/tests/remove-directory-replaced-with-symlink.py | 16 |
3 files changed, 29 insertions, 1 deletions
diff --git a/lib/libalpm/remove.c b/lib/libalpm/remove.c index 8ce10f84..ffe92518 100644 --- a/lib/libalpm/remove.c +++ b/lib/libalpm/remove.c @@ -440,8 +440,19 @@ static int unlink_file(alpm_handle_t *handle, alpm_pkg_t *oldpkg, { struct stat buf; char file[PATH_MAX]; + int file_len; - snprintf(file, PATH_MAX, "%s%s", handle->root, fileobj->name); + file_len = snprintf(file, PATH_MAX, "%s%s", handle->root, fileobj->name); + if(file_len <= 0 || file_len >= PATH_MAX) { + /* 0 is a valid value from snprintf, but should be impossible here */ + _alpm_log(handle, ALPM_LOG_DEBUG, "path too long to unlink %s%s\n", + handle->root, fileobj->name); + return -1; + } else if(file[file_len-1] == '/') { + /* trailing slashes cause errors and confusing messages if the user has + * replaced a directory with a symlink */ + file[--file_len] = '\0'; + } if(llstat(file, &buf)) { _alpm_log(handle, ALPM_LOG_DEBUG, "file %s does not exist\n", file); diff --git a/test/pacman/tests/TESTS b/test/pacman/tests/TESTS index eadb63b4..4dfa3bdb 100644 --- a/test/pacman/tests/TESTS +++ b/test/pacman/tests/TESTS @@ -113,6 +113,7 @@ TESTS += test/pacman/tests/querycheck002.py TESTS += test/pacman/tests/querycheck_fast_file_type.py TESTS += test/pacman/tests/reason001.py TESTS += test/pacman/tests/remove-assumeinstalled.py +TESTS += test/pacman/tests/remove-directory-replaced-with-symlink.py TESTS += test/pacman/tests/remove-optdepend-of-installed-package.py TESTS += test/pacman/tests/remove-recursive-cycle.py TESTS += test/pacman/tests/remove001.py diff --git a/test/pacman/tests/remove-directory-replaced-with-symlink.py b/test/pacman/tests/remove-directory-replaced-with-symlink.py new file mode 100644 index 00000000..37be7579 --- /dev/null +++ b/test/pacman/tests/remove-directory-replaced-with-symlink.py @@ -0,0 +1,16 @@ +self.description = "remove a package with a directory that has been replaced with a symlink" + +self.filesystem = [ "var/", "srv -> var/" ] + +lpkg = pmpkg("pkg1") +lpkg.files = ["srv/"] +self.addpkg2db("local", lpkg) + +self.args = "-R %s" % (lpkg.name) + +self.addrule("PACMAN_RETCODE=0") +self.addrule("DIR_EXIST=var/") +self.addrule("!LINK_EXIST=srv") +self.addrule("!FILE_EXIST=srv") +self.addrule("!DIR_EXIST=srv") +self.addrule("!PACMAN_OUTPUT=cannot remove") |