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Mount /dev/mqueue if missing and set sticky bit to /dev/shm

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Inspired by Alpine Linux, add /dev/mqueue if missing.  We should check
the /proc/filesystems first, but this is quicker.

The sticky bit ensures only the owner of files in /dev/shm can delete or
rename files.  This is also what Alpine Linux use.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2024-01-06 23:50:30 +01:00
parent 791df0c986
commit 337ee003bb
1 changed files with 11 additions and 3 deletions
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src/finit.c
+11 -3
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@@ -355,6 +355,8 @@ static void fs_remount_root(int fsckerr)
*/
static void fs_finalize(void)
{
int flags = MS_NOEXEC | MS_NOSUID;
/*
* Some systems rely on us to both create /dev/shm and, to mount
* a tmpfs there. Any system with dbus needs shared memory, so
@@ -362,8 +364,8 @@ static void fs_finalize(void)
* the /etc/fstab file already.
*/
if (!fismnt("/dev/shm")) {
makedir("/dev/shm", 0777);
fs_mount("shm", "/dev/shm", "tmpfs", 0, "mode=0777");
makedir("/dev/shm", 1777);
fs_mount("shm", "/dev/shm", "tmpfs", flags | MS_NODEV, "mode=1777");
}
/* Modern systems use /dev/pts */
@@ -381,7 +383,13 @@ static void fs_finalize(void)
snprintf(opts, sizeof(opts), "gid=%d,mode=%d,ptmxmode=0666", gid, mode);
makedir("/dev/pts", 0755);
fs_mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, opts);
fs_mount("devpts", "/dev/pts", "devpts", flags, opts);
}
/* Needed on systems like Alpine Linux */
if (!fismnt("/dev/mqueue")) {
makedir("/dev/mqueue", 1777);
fs_mount("mqueue", "/dev/mqueue", "tmpfs", flags | MS_NODEV, NULL);
}
/*