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Explicitly error when reading directories

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FreeBSD will allow read() on arbitrary directories, causing fish to
produce a nonsense error. Use fstat() to check for directories before
reading.
This commit is contained in:
ridiculousfish 2021-09-17 20:48:58 -07:00
parent 9a2482557d
commit 881b987934
1 changed files with 14 additions and 0 deletions
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14
src/reader.cpp
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@ -4204,8 +4204,22 @@ void reader_set_buffer(const wcstring &b, size_t pos) {
/// highlighting. This is used for reading scripts and init files.
/// The file is not closed.
static int read_ni(parser_t &parser, int fd, const io_chain_t &io) {
struct stat buf {};
if (fstat(fd, &buf) == -1) {
int err = errno;
FLOGF(error, _(L"Unable to read input file: %s"), strerror(err));
return 1;
}
/* FreeBSD allows read() on directories. Error explicitly in that case. */
if (buf.st_mode & S_IFDIR) {
FLOGF(error, _(L"Unable to read input file: %s"), strerror(EISDIR));
return 1;
}
// Read all data into a std::string.
std::string fd_contents;
fd_contents.reserve(buf.st_size);
for (;;) {
char buff[4096];
ssize_t amt = read(fd, buff, sizeof buff);