diff options
Diffstat (limited to 'archival/libarchive/unsafe_prefix.c')
-rw-r--r-- | archival/libarchive/unsafe_prefix.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/archival/libarchive/unsafe_prefix.c b/archival/libarchive/unsafe_prefix.c new file mode 100644 index 000000000..826c673bf --- /dev/null +++ b/archival/libarchive/unsafe_prefix.c @@ -0,0 +1,36 @@ +/* vi: set sw=4 ts=4: */ +/* + * Licensed under GPLv2 or later, see file LICENSE in this source tree. + */ + +#include "libbb.h" +#include "bb_archive.h" + +const char* FAST_FUNC strip_unsafe_prefix(const char *str) +{ + const char *cp = str; + while (1) { + char *cp2; + if (*cp == '/') { + cp++; + continue; + } + if (strncmp(cp, "/../"+1, 3) == 0) { + cp += 3; + continue; + } + cp2 = strstr(cp, "/../"); + if (!cp2) + break; + cp = cp2 + 4; + } + if (cp != str) { + static smallint warned = 0; + if (!warned) { + warned = 1; + bb_error_msg("removing leading '%.*s' from member names", + (int)(cp - str), str); + } + } + return cp; +} |