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serenity/Libraries/LibC
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Andreas Kling 0569123ad7 Kernel: Add a basic implementation of unveil() 
This syscall is a complement to pledge() and adds the same sort of
incremental relinquishing of capabilities for filesystem access.

The first call to unveil() will "drop a veil" on the process, and from
now on, only unveiled parts of the filesystem are visible to it.

Each call to unveil() specifies a path to either a directory or a file
along with permissions for that path. The permissions are a combination
of the following:

- r: Read access (like the "rpath" promise)
- w: Write access (like the "wpath" promise)
- x: Execute access
- c: Create/remove access (like the "cpath" promise)

Attempts to open a path that has not been unveiled with fail with
ENOENT. If the unveiled path lacks sufficient permissions, it will fail
with EACCES.

Like pledge(), subsequent calls to unveil() with the same path can only
remove permissions, not add them.

Once you call unveil(nullptr, nullptr), the veil is locked, and it's no
longer possible to unveil any more paths for the process, ever.

This concept comes from OpenBSD, and their implementation does various
things differently, I'm sure. This is just a first implementation for
SerenityOS, and we'll keep improving on it as we go. :^)
2020-01-20 22:12:04 +01:00
..
arpa Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
bits Kernel+AK: Add/fix uintptr_t and intptr_t definitions 2020-01-20 13:13:03 +01:00
net Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
netinet Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
sys Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
alloca.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
assert.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
assert.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
crt0.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
crti.S Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
crtn.S Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
ctype.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
ctype.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
cxxabi.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
dirent.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
dirent.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
dlfcn.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
dlfcn.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
endian.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
errno.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
errno_numbers.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
fcntl.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
fcntl.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
fd_set.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
float.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
getopt.cpp LibC: Ensure getopt error messages end with a newline 2019-09-17 21:56:42 +02:00
getopt.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
grp.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
grp.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
iconv.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
inttypes.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
ioctl.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
libcinit.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
libgen.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
libgen.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
limits.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
locale.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
locale.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
Makefile LibC: Move even more methods and globals out of crt0.o 2020-01-13 13:03:30 +01:00
malloc.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
mallocdefs.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
memory.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
mman.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
mman.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
mntent.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
mntent.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
netdb.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
netdb.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
poll.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
poll.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
pwd.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
pwd.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
qsort.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
scanf.cpp LibC: Some build fixes for strange platforms 2019-09-29 21:02:13 +02:00
sched.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
sched.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
serenity.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
serenity.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
setjmp.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
setjmp.S Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
signal.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
signal.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
signal_numbers.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
stat.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
stdarg.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
stdbool.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
stddef.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
stdint.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
stdio.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
stdio.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
stdlib.cpp LibC: Use the templated type consistently in strtol_impl<T> 2020-01-18 11:41:04 +01:00
stdlib.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
string.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
string.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
strings.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
strings.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
syslog.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
syslog.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
termcap.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
termcap.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
termios.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
termios.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
time.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
time.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
times.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
ulimit.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
ulimit.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
unistd.cpp Kernel: Add a basic implementation of unveil() 2020-01-20 22:12:04 +01:00
unistd.h Kernel: Add a basic implementation of unveil() 2020-01-20 22:12:04 +01:00
utime.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
utime.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
utmp.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
utsname.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
wchar.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
wchar.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00