Commit e374e6829cea3512f0b4a4069c5a6168f0f8d8a0 closed stdin before running scripts/hooks. This left the exec'd process with no file descriptor 0. If the process subsequently opened a file it would be assigned fd 0, and could potentially be confused for stdin. Connecting and immediately closing the parent2child pipe ensures that the child has an fd 0 and that it is empty.
Signed-off-by: Andrew Gregory <[email protected]> --- See https://bbs.archlinux.org/viewtopic.php?id=209151 Missing fd 0 has also caused bash to start sourcing ~/.basrc (see https://lists.archlinux.org/pipermail/pacman-dev/2016-February/020870.html) but that is due to a bug in bash that has been reported and should get fixed. lib/libalpm/util.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c index 001c042..4a4847d 100644 --- a/lib/libalpm/util.c +++ b/lib/libalpm/util.c @@ -586,7 +586,7 @@ int _alpm_run_chroot(alpm_handle_t *handle, const char *cmd, char *const argv[], goto cleanup; } - if(stdin_cb && pipe(parent2child_pipefd) == -1) { + if(pipe(parent2child_pipefd) == -1) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not create pipe (%s)\n"), strerror(errno)); retval = 1; goto cleanup; @@ -607,11 +607,9 @@ int _alpm_run_chroot(alpm_handle_t *handle, const char *cmd, char *const argv[], close(2); while(dup2(child2parent_pipefd[1], 1) == -1 && errno == EINTR); while(dup2(child2parent_pipefd[1], 2) == -1 && errno == EINTR); - if(stdin_cb) { - while(dup2(parent2child_pipefd[0], 0) == -1 && errno == EINTR); - close(parent2child_pipefd[0]); - close(parent2child_pipefd[1]); - } + while(dup2(parent2child_pipefd[0], 0) == -1 && errno == EINTR); + close(parent2child_pipefd[0]); + close(parent2child_pipefd[1]); close(child2parent_pipefd[0]); close(child2parent_pipefd[1]); if(cwdfd >= 0) { @@ -646,15 +644,16 @@ int _alpm_run_chroot(alpm_handle_t *handle, const char *cmd, char *const argv[], child2parent->events = POLLIN; fcntl(child2parent->fd, F_SETFL, O_NONBLOCK); close(child2parent_pipefd[1]); + close(parent2child_pipefd[0]); if(stdin_cb) { parent2child->fd = parent2child_pipefd[1]; parent2child->events = POLLOUT; fcntl(parent2child->fd, F_SETFL, O_NONBLOCK); - close(parent2child_pipefd[0]); } else { parent2child->fd = -1; parent2child->events = 0; + close(parent2child_pipefd[1]); } #define STOP_POLLING(p) do { close(p->fd); p->fd = -1; } while(0) -- 2.7.1
