Due to insufficient validation of network-provided data it may have been
possible for a malicious actor to craft a bootp packet which could cause
a stack buffer overflow.
admbugs: 850
Reported by: Reno Robert
Reviewed by: markj
Approved by: so
Security: FreeBSD-SA-18:15.bootpd
Sponsored by: The FreeBSD Foundation
/usr/sbin/audit(dist)?d are only installed if ${MK_AUDIT} == yes. Their
supporting scripts should only be installed in those instances as well.
Submitted by: ngie
Reviewed by: emaste
MFC after: 2 weeks
Pull Request: https://github.com/freebsd/freebsd/pull/242
The original code did not support dynamically loaded libraries and used
suboptimal access to TLS variables.
New implementation removes lazy resolving of TLS relocation - due to flaw
in TLSDESC design is impossible to switch resolver function at runtime
without expensive locking.
Due to this, 3 specialized resolvers are implemented:
- load time resolver for TLS relocation from libraries loaded with main
executable (thus with known TLS offset).
- resolver for undefined thread weak symbols.
- slower lazy resolver for dynamically loaded libraries with fast path for
already resolved symbols.
PR: 228892, 232149, 233204, 232311
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D18417
'read' pessimistically read(2)s one byte at a time, which can be quite
silly for large environments in slow emulators.
In my boring user environment, truss shows that the number of read()
syscalls to source rc.subr and invoke list_vars is reduced by something like
3400 to 60. ministat(1) shows a significant time difference of about -71%
for my environment.
Suggested by: jilles
Discussed with: dteske, jhb, jilles
Differential Revision: https://reviews.freebsd.org/D18481
Although these are slightly obsolete in favor of R_AARCH64_TLSDESC,
gcc -mtls-dialect=trad still use them.
Please note that definition of TLS_DTPMOD64 and TLS_DTPREL64 are incorrectly
exchanged in GNU binutils. TLS_DTPREL64 should be encoded to 1028 (as is
defined in ARM ELF ABI) but binutils encode it to 1029. And vice versa,
TLS_DTPMOD64 should be encoded to 1029 but binutils encode it to 1028.
While I'm in, add also R_AARCH64_NONE. It can be produced as result of linker
relaxation.
MFC after: 1 week
- don't relocate jump slots multiple times (if LD_BIND_NOW is defined).
- process only R_AARCH64_JUMP_SLOT here, other relocation types are handled
by reloc_plt().
MFC after: 1 week
- Do not perform ifunc relocations together with other PLT relocations
in PLT. Instead, do it during an additional pass over the init
list, so that ifuncs are resolved in the order of dso
dependencies. This allows the ifuncs resolvers to call into depended
libs. Init list now includes all objects instead of only objects
with init/fini callables.
- Disable relro protection around bind_now ifunc relocations.
I considered calling ifunc resolvers of dso after initializers of all
dependencies are processed, and decided that this is wrong/should not
be supported. The order now is normal relocations for all
objects->ifunc resolution in init order->initializers, where each step
does complete pass over all loaded objects before moving to the next
step.
Reported, tested and reviewed by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D18400
bzero(3) for rtld.
This again reduces rtld dependency on libc, and in future, avoid ifunc
relocations when the functions are converted to ifuncs in libc.
Reported by: mjg
Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D18400
An issue remains with BIND_NOW and processes using threads. For now,
restore libc's BIND_NOW disable, and also disable BIND_NOW in rtld and
libthr.
A patch is in review (D18400) that likely fixes this issue, but just
disable BIND_NOW pending further testing after it is committed.
PR: 233333
Sponsored by: The FreeBSD Foundation
The function reloc_non_plt has complicated variable lifetimes that GCC 6.4.0
(the version currently used by amd64-xtoolchain-gcc) misunderstands and
produces an erroneous warning about. Silence it to allow the -Werror build
to proceed.
Reviewed by: emaste
immediately after other PLT relocs.
Otherwise, if the object has relro page, we write to readonly page,
and we would need to use mprotect(2) two more times to fix it. Note
that resolve_object_ifunc() does nothing when called second time, so
there is no need to avoid existing call.
Reported and tested by: emaste
PR: 233333
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
This dynamic tag contains the location of the .rld_map section relative to
the location of the dynamic tag. For PIE MIPS binaries DT_MIPS_RLD_MAP can
not be used since it contains an absolute address. Without this change
GDB can not find the function program counters in other libraries and once
I apply this change I can successfully run info sharedlibraries again.
Reviewed By: kib
Differential Revision: https://reviews.freebsd.org/D17867
Previously the combination of relro (implicit), -z now and ifunc use
resulted in a segfault when applying ifuncs after relro (test binary
here just calls amd64_get_fsbase()):
| % env LD_DEBUG=1 libexec/rtld-elf/obj/ld-elf.so.1 a.out
| ...
| enforcing main obj relro
| ...
| resolving ifuncs
| reloc_jmpslot: *0x203198 = 0x189368ea4570
| zsh: bus error (core dumped) LD_DEBUG=1 obj/ld-elf.so.1 ~/a.out
Reported by: Shawn Webb
Reviewed by: kib
Sponsored by: The FreeBSD Foundation
It is unused after r340102, and more important, I do not see how to
define textsize in both practically useful and correct way, for binaries
with more that one executable segments.
Sponsored by: The FreeBSD Foundation
Do not use textsize and do not flush everything between map base and
base + textsize, because unmapped areas cannot be flushed.
This makes Obj_Entry textsize only use go away, and I will remove it
later.
Reported by: tuexen
Tested by: Mark Millard <marklmi26-fbsd@yahoo.com>
Sponsored by: The FreeBSD Foundation
This adds new keywords to rc/service to enable/disable a service's
rc.conf(5) variable and "delete" to remove the variable.
When the "service_delete_empty" variable in rc.conf(5) is set to "YES"
(default is "NO") an rc.conf.d file (in /etc/ or /usr/local/etc) is
deleted if empty after modification using "service $foo delete".
Submitted by: lme (modified)
Reviewed by: 0mp (previous version), lme, bcr
Relnotes: yes
Sponsored by: Smule, Inc.
Differential Revision: https://reviews.freebsd.org/D17113
One less non-trivial dependency of rtld on libc. Also,
amd64_set_fsbase() is to be converted to ifunc, which I do not want to
support inside rtld.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
In particular, do it before the first call to allocate_initial_tls(),
which contains MD parts to set the initial thread' TLS pointer.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
With lld-generated binaries the first PT_LOAD will usually be a read-only
segment unless you pass --no-rosegment. For those binaries the textsize is
determined by the next PT_LOAD. To allow both LLD and bfd 2.17 binaries to
be parsed correctly use the end of the last PT_LOAD that is marked as
executable instead.
I noticed that the value was wrong while adding some debug prints for some rtld
changes for CHERI binaries. `obj->textsize` only seems to be used by PPC so the
effect is untested. However, the value before was definitely wrong and the new
result matches the phdrs.
Reviewed By: kib
Approved By: brooks (mentor)
Differential Revision: https://reviews.freebsd.org/D17117
and runs scripts containing "KEYWORD: resume" with single "resume" argument.
Working example is the port sysutils/cpupdate that defines
extra_commands="resume" to reload CPU microcode cleared
by suspend/resume sequence.
This change does nothing for a system having no scripts with KEYWORD: resume.
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D15247
Currently, rc.inidiskless assumes that local system configuration
changes are kept in some mountable file system. For example,
nanobsd uses dedicated partition mounted as /cfg for this.
However, small embedded devices like MIPS routers may have no enough flash
space to keep full-blown file system but have only one or couple
small flash blocks to keep persistent local configuration overrides.
This change extends rc.initdiskless and introduces ability to run auxiliary
command /conf/T/M/extract that is supposed to extract configuration overrides
from such local storage.
For example, the command /conf/default/etc/extract may contain something like:
cd "$1" && bsdcpio --quiet -idu < /dev/map/cfg
bsdcpio command extracts compressed archive from the storage to /etc
assuming the storage is exposed by the kernel as /dev/map/cfg to userland.
PR: 204215
MFC after: 1 month
and make previously working configuration like this work again:
gif_interfaces="gif0"
gifconfig_gif0="1.1.1.1 2.2.2.2"
ifconfig_gif0="inet 192.168.1.1 192.168.1.2 netmask 255.255.255.252"
PR: 204700
MFC after: 1 month
if a network connection is available. This is not an issue when running
'service local_unbound setup' interactively, but can be on a diskless
system where local_unbound self-configures on every boot. To address
this, add explicit dependencies on netwait and defaultroute.
Submitted by: eugen
Approved by: re (gjb)
in r339413, a current pkgbase update problem came up. For users
testing pkgbase at the moment there is no (automatic) way to pick
up new base packages (yet).
As a result rather than also moving init(8) to its own package,
back out the part of the change in r339413 that moved rc* to its
own package and defer creating new packages until the
infrastructure is in place to handle these cases.
Both init and rc* are considered too problematic to be lost by
early adaptors at this stage.
Discussed with: brd
Reviewed by: brd
Approved by: re (gjb)
The reasons for this are forward looking to pkgbase:
* /sbin/init is a special binary; try not to replace it with
every package update because an rc script was touched.
(a follow-up commit will make init its own package)
* having rc in its own place will allow more easy replacement
of the rc framework with alternatives, such as openrc.
Discussed with: brd (during BSDCam), kmoore
Requested by: cem, bz
PR: 231522
Approved by: re (gjb)
Fix the issue with subtracting the TLS_TCB_SIZE too when we are trying to get
the 'where' in the R_PPC_TPREL32 case. At allocation time we added an offset
and the TLS_TCB_SIZE. This has to be subtracted as well.
Now all the issues reported are fixed. Tests were done on G4 and G5 PowerMac's.
Additionally I ran the tls tests from the gcc test suite and made sure the
results are as good as pre 338486.
Thanks to tuexen for reporting the malfunction and for patient testing.
Also testing thanks goes to jhibbits.
Reported by: tuexen
Discussed with: jhibbits, nwhitehorn
Approved by: re (gjb)
Pointyhat to: andreast
This is based on the amd64 implementation. Support for both PLT and
non-PLT (e.g. a global variable initilised with a pointer to an ifunc)
cases are supported.
We don't pass anything to the resolver as it is expected they will read
the ID registers directly, with the number of registers with CPU info
likely to increase in the future.
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17341
search_library_path().
This corrects the scope of libmap matches.
Reported and tested by: Andreas Longwitz <longwitz@incore.de>
Sponsored by: The FreeBSD Foundation
Approved by: re (gjb)
MFC after: 1 week
This is useful when lm_find() moves the match to the global mapping,
since lm_find() could be called with a same path more than once.
Reported and tested by: Andreas Longwitz <longwitz@incore.de>
Sponsored by: The FreeBSD Foundation
Approved by: re (gjb)
MFC after: 1 week
some TLS bits. This broke operation on the PowerMac. Namely one could not login.
At login the screen/shell was giving back lots of backslashes and the login
shell dumped core.
The fix to this issue is to revert the powerpc commit from 338486 and to
increase the TLS_TCB_SIZE to 16.
Reverting only did not help, login was possible but userland applications
aborted with strange messages.
I tested this patch with world/kernel builds and with port upgrades.
Additionally a full gcc8 bootstrap was successfully completed.
Reviewed by: jhibbits@
Approved by: re (Glen)
The above commit fixed handling overaligned TLS segments in libc's
TLS Variant I implementation, but rtld provides its own implementation
for dynamically-linked executables which lacks these fixes. Thus,
port these changes to rtld.
This was previously commited as r337978 and reverted in r338149 due to
exposing a bug the ARM rtld. This bug was fixed in r338317 by mmel.
Submitted by: James Clarke
Approved by: re (kib)
Reviewed by: kbowling
Testing by: kbowling (powerpc64), br (riscv), kevans (armv7)
Obtained from: CheriBSD
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D16510
