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fix for stat(2) path traversal using fstat #138

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fix for stat(2) path traversal using fstat #138

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25 changes: 23 additions & 2 deletions src/lfs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -167,7 +167,7 @@ typedef struct dir_data {
#define _O_BINARY 0
#define lfs_setmode(file, m) ((void)file, (void)m, 0)
#define STAT_STRUCT struct stat
#define STAT_FUNC stat
#define STAT_FUNC fstat
#define LSTAT_FUNC lstat

#endif
Expand Down Expand Up @@ -1014,13 +1014,34 @@ static int _file_info_(lua_State * L,
const char *file = luaL_checkstring(L, 1);
int i;

if (st(file, &info)) {
#ifndef _WIN32
// From stat(2) manpage: "No permissions are required on the file
// itself, but—in the case of stat(), fstatat(), and lstat() execute
// (search) permission is required on all of the directories in
// pathname that lead to the file."
//
// Therefore here fstat is used on a previously open file descriptor
// to avoid unneeded limitations on POSIX systems.
int fd = open(file, O_RDONLY);
if(fd<0) {
lua_pushnil(L);
lua_pushfstring(L, "cannot open file '%s': %s",
file, strerror(errno));
lua_pushinteger(L, errno);
return(3);
}
#endif
if (st(fd, &info)) {
lua_pushnil(L);
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I think you should also close file inside if statement

lua_pushfstring(L, "cannot obtain information from file '%s': %s",
file, strerror(errno));
lua_pushinteger(L, errno);
return 3;
}
#ifndef _WIN32
close(fd);
#endif

if (lua_isstring(L, 2)) {
const char *member = lua_tostring(L, 2);
for (i = 0; members[i].name; i++) {
Expand Down