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From 7f0f2caa082e7490c160b2c992a094116474a95f Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Fri, 4 Nov 2022 18:26:42 +0100
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Subject: [PATCH] dissect: fix fsck
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Since f7725647bb41c3398a867f139efe526efe8aa1b3 when dissecting a disk
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image we operate with fds to the device nodes in question wherever we
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can. This includes when we fork off fsck, where we pass a /proc/self/fd/
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path as argument. This only works if we keep that fd open however and
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disable O_CLOEXEC on the fd. Hence do so, and fix fsck this way.
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(Without this, all fsck will fail, since the fd path is invalid)
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(cherry picked from commit f8ab781223bcb0330ee4499b879a62e84fee313e)
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Related: #2138081
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---
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src/shared/dissect-image.c | 16 ++++++++++------
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1 file changed, 10 insertions(+), 6 deletions(-)
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diff --git a/src/shared/dissect-image.c b/src/shared/dissect-image.c
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index 6a991c877a..7676636723 100644
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--- a/src/shared/dissect-image.c
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+++ b/src/shared/dissect-image.c
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@@ -1309,11 +1309,11 @@ static int is_loop_device(const char *path) {
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return true;
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}
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-static int run_fsck(const char *node, const char *fstype) {
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+static int run_fsck(int node_fd, const char *fstype) {
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int r, exit_status;
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pid_t pid;
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- assert(node);
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+ assert(node_fd >= 0);
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assert(fstype);
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r = fsck_exists_for_fstype(fstype);
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@@ -1322,16 +1322,20 @@ static int run_fsck(const char *node, const char *fstype) {
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return 0;
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}
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if (r == 0) {
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- log_debug("Not checking partition %s, as fsck for %s does not exist.", node, fstype);
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+ log_debug("Not checking partition %s, as fsck for %s does not exist.", FORMAT_PROC_FD_PATH(node_fd), fstype);
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return 0;
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}
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- r = safe_fork("(fsck)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG|FORK_NULL_STDIO, &pid;;
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+ r = safe_fork_full(
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+ "(fsck)",
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+ &node_fd, 1, /* Leave the node fd open */
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+ FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG|FORK_NULL_STDIO|FORK_CLOEXEC_OFF,
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+ &pid;;
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if (r < 0)
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return log_debug_errno(r, "Failed to fork off fsck: %m");
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if (r == 0) {
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/* Child */
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- execl("/sbin/fsck", "/sbin/fsck", "-aT", node, NULL);
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+ execl("/sbin/fsck", "/sbin/fsck", "-aT", FORMAT_PROC_FD_PATH(node_fd), NULL);
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log_open();
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log_debug_errno(errno, "Failed to execl() fsck: %m");
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_exit(FSCK_OPERATIONAL_ERROR);
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@@ -1421,7 +1425,7 @@ static int mount_partition(
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rw = m->rw && !(flags & DISSECT_IMAGE_MOUNT_READ_ONLY);
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if (FLAGS_SET(flags, DISSECT_IMAGE_FSCK) && rw) {
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- r = run_fsck(node, fstype);
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+ r = run_fsck(m->mount_node_fd, fstype);
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if (r < 0)
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return r;
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}
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