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| author | Andrew Gregory <andrew.gregory.8@gmail.com> | 2016-02-22 03:46:38 +0100 |
|---|---|---|
| committer | Allan McRae <allan@archlinux.org> | 2016-02-23 03:33:04 +0100 |
| commit | 1d6583a58da0904fb7feafd4a666391087955a7b (patch) | |
| tree | ecb5f220e7d3851512eba9ac2f9bad79b8ea3038 /lib | |
| parent | ce1f453b74c8fd0966e1d11d3deeb1a777055fc5 (diff) | |
| download | pacman-1d6583a58da0904fb7feafd4a666391087955a7b.tar.gz pacman-1d6583a58da0904fb7feafd4a666391087955a7b.tar.xz | |
alpm_run_chroot: always connect parent2child pipe
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 <andrew.gregory.8@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libalpm/util.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c index 001c042d..4a4847de 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) |