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authorAndrew Gregory <andrew.gregory.8@gmail.com>2017-04-10 01:49:17 +0200
committerAndrew Gregory <andrew.gregory.8@gmail.com>2017-04-17 01:41:35 +0200
commit16b91f798faf6413f9b043543c5c0c3467b6fdbf (patch)
tree929d4406c6fe65d234bb5239dd6b027cedd80654 /lib/libalpm
parentf9de3b22ad9e532af14c8d5b0b90a3f0f747e331 (diff)
downloadpacman-16b91f798faf6413f9b043543c5c0c3467b6fdbf.tar.gz
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>
Diffstat (limited to 'lib/libalpm')
-rw-r--r--lib/libalpm/remove.c13
1 files changed, 12 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);