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Approved by:	so
This commit is contained in:
Gordon Tetlow 2018-09-12 05:22:58 +00:00
parent 3f3c94845a
commit 4dff4ff1a6
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=52250
8 changed files with 637 additions and 0 deletions
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140
share/security/advisories/FreeBSD-EN-18:08.lazyfpu.asc Normal file
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
=============================================================================
FreeBSD-EN-18:08.lazyfpu Errata Notice
The FreeBSD Project
Topic: LazyFPU remediation causes potential data corruption
Category: core
Module: kernel
Announced: 2018-09-12
Credits: Gleb Kurtsou
Affects: FreeBSD 10.4-STABLE, 11.1 and later.
Corrected: 2018-07-31 10:18:30 UTC (stable/11, 11.1-STABLE)
2018-09-12 05:08:49 UTC (releng/11.2, 11.2-RELEASE-p3)
2018-09-12 05:08:49 UTC (releng/11.1, 11.1-RELEASE-p14)
2018-08-03 14:12:37 UTC (stable/10, 10.4-STABLE)
For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:https://security.FreeBSD.org/>.
Special Note: While SA-18:07.lazyfpu has been fixed in 10.4-STABLE, it has
yet to be released for 10.4-RELEASE. As such, this EN does not apply for
that release. Once SA-18:07.lazyfpu has been updated for 10.4-RELEASE,
this EN will be incorporated at that time.
I. Background
The recent security advisory titled SA-18:07.lazyfpu resolved an issue in the
floating point unit (FPU) state handling.
II. Problem Description
As a result of fixing the issue described in SA-18:07.lazyfpu, a regression
was introduced. FPU state manipulation did not sufficiently prevent context
switches potentially allowing partially modified FPU context to be switched
out. Upon returning the thread to a running state, stale FPU context could
be reloaded.
III. Impact
The regression could potentially cause an inconsistent FPU state, leading to
data corruption.
IV. Workaround
No workaround is available.
V. Solution
Perform one of the following:
1) Upgrade your system to a supported FreeBSD stable or release / security
branch (releng) dated after the correction date.
Afterward, reboot the system.
2) To update your system via a binary patch:
Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:
# freebsd-update fetch
# freebsd-update install
Afterward, reboot the system.
3) To update your system via a source code patch:
The following patches have been verified to apply to the applicable
FreeBSD release branches.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
[FreeBSD 11.x]
# fetch https://security.FreeBSD.org/patches/EN-18:08/lazyfpu-11.patch
# fetch https://security.FreeBSD.org/patches/EN-18:08/lazyfpu-11.patch.asc
# gpg --verify lazyfpu-11.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile your kernel as described in
<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
system.
VI. Correction details
The following list contains the correction revision numbers for each
affected branch.
Branch/path Revision
- -------------------------------------------------------------------------
stable/10/ r337254
stable/11/ r336963
releng/11.1/ r338607
releng/11.2/ r338607
- -------------------------------------------------------------------------
To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:
# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
Or visit the following URL, replacing NNNNNN with the revision number:
<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
VII. References
The security advisory that introduced the regression is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-18:07.lazyfpu.asc>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-18:08.lazyfpu.asc>
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128
share/security/advisories/FreeBSD-SA-18:12.elf.asc Normal file
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@ -0,0 +1,128 @@
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
=============================================================================
FreeBSD-SA-18:12.elf Security Advisory
The FreeBSD Project
Topic: Improper ELF header parsing
Category: core
Module: kernel
Announced: 2018-09-12
Credits: Thomas Barabosch, Fraunhofer FKIE; Mark Johnston
Affects: All supported versions of FreeBSD.
Corrected: 2018-09-12 05:02:11 UTC (stable/11, 11.1-STABLE)
2018-09-12 05:07:35 UTC (releng/11.2, 11.2-RELEASE-p3)
2018-09-12 05:07:35 UTC (releng/11.1, 11.1-RELEASE-p14)
2018-09-12 05:03:30 UTC (stable/10, 10.4-STABLE)
2018-09-12 05:07:35 UTC (releng/10.4, 10.4-RELEASE-p12)
CVE Name: CVE-2018-6924
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.
I. Background
To execute a binary the kernel must parse the ELF header to determine the
entry point address, the program interpreter, and other parameters.
II. Problem Description
Insufficient validation was performed in the ELF header parser, and malformed
or otherwise invalid ELF binaries were not rejected as they should be.
III. Impact
Execution of a malicious ELF binary may result in a kernel crash or may
disclose kernel memory.
IV. Workaround
No workaround is available.
V. Solution
Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date, and
reboot.
1) To update your vulnerable system via a binary patch:
Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:
# freebsd-update fetch
# freebsd-update install
# shutdown -r +30 "Rebooting for security update"
2) To update your vulnerable system via a source code patch:
The following patches have been verified to apply to the applicable
FreeBSD release branches.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch https://security.FreeBSD.org/patches/SA-18:12/elf.patch
# fetch https://security.FreeBSD.org/patches/SA-18:12/elf.patch.asc
# gpg --verify elf.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile your kernel as described in
<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
system.
VI. Correction details
The following list contains the correction revision numbers for each
affected branch.
Branch/path Revision
- -------------------------------------------------------------------------
stable/10/ r338605
releng/10.4/ r338606
stable/11/ r338604
releng/11.1/ r338606
releng/11.2/ r338606
- -------------------------------------------------------------------------
To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:
# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
Or visit the following URL, replacing NNNNNN with the revision number:
<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
VII. References
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6924>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-18:12.elf.asc>
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-----END PGP SIGNATURE-----

272
share/security/patches/EN-18:08/lazyfpu-11.patch Normal file
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@ -0,0 +1,272 @@
--- sys/amd64/amd64/fpu.c.orig
+++ sys/amd64/amd64/fpu.c
@@ -744,6 +744,7 @@
int max_ext_n, i, owned;
pcb = td->td_pcb;
+ critical_enter();
if ((pcb->pcb_flags & PCB_USERFPUINITDONE) == 0) {
bcopy(fpu_initialstate, get_pcb_user_save_pcb(pcb),
cpu_max_ext_state_size);
@@ -750,9 +751,9 @@
get_pcb_user_save_pcb(pcb)->sv_env.en_cw =
pcb->pcb_initial_fpucw;
fpuuserinited(td);
+ critical_exit();
return (_MC_FPOWNED_PCB);
}
- critical_enter();
if (td == PCPU_GET(fpcurthread) && PCB_USER_FPU(pcb)) {
fpusave(get_pcb_user_save_pcb(pcb));
owned = _MC_FPOWNED_FPU;
@@ -759,7 +760,6 @@
} else {
owned = _MC_FPOWNED_PCB;
}
- critical_exit();
if (use_xsave) {
/*
* Handle partially saved state.
@@ -779,6 +779,7 @@
*xstate_bv |= bit;
}
}
+ critical_exit();
return (owned);
}
@@ -787,6 +788,7 @@
{
struct pcb *pcb;
+ CRITICAL_ASSERT(td);
pcb = td->td_pcb;
if (PCB_USER_FPU(pcb))
set_pcb_flags(pcb,
@@ -845,26 +847,25 @@
addr->sv_env.en_mxcsr &= cpu_mxcsr_mask;
pcb = td->td_pcb;
+ error = 0;
critical_enter();
if (td == PCPU_GET(fpcurthread) && PCB_USER_FPU(pcb)) {
error = fpusetxstate(td, xfpustate, xfpustate_size);
- if (error != 0) {
- critical_exit();
- return (error);
+ if (error == 0) {
+ bcopy(addr, get_pcb_user_save_td(td), sizeof(*addr));
+ fpurestore(get_pcb_user_save_td(td));
+ set_pcb_flags(pcb, PCB_FPUINITDONE |
+ PCB_USERFPUINITDONE);
}
- bcopy(addr, get_pcb_user_save_td(td), sizeof(*addr));
- fpurestore(get_pcb_user_save_td(td));
- critical_exit();
- set_pcb_flags(pcb, PCB_FPUINITDONE | PCB_USERFPUINITDONE);
} else {
- critical_exit();
error = fpusetxstate(td, xfpustate, xfpustate_size);
- if (error != 0)
- return (error);
- bcopy(addr, get_pcb_user_save_td(td), sizeof(*addr));
- fpuuserinited(td);
+ if (error == 0) {
+ bcopy(addr, get_pcb_user_save_td(td), sizeof(*addr));
+ fpuuserinited(td);
+ }
}
- return (0);
+ critical_exit();
+ return (error);
}
/*
@@ -1037,6 +1038,7 @@
ctx->flags = FPU_KERN_CTX_DUMMY | FPU_KERN_CTX_INUSE;
return (0);
}
+ critical_enter();
KASSERT(!PCB_USER_FPU(pcb) || pcb->pcb_save ==
get_pcb_user_save_pcb(pcb), ("mangled pcb_save"));
ctx->flags = FPU_KERN_CTX_INUSE;
@@ -1047,6 +1049,7 @@
pcb->pcb_save = fpu_kern_ctx_savefpu(ctx);
set_pcb_flags(pcb, PCB_KERNFPU);
clear_pcb_flags(pcb, PCB_FPUINITDONE);
+ critical_exit();
return (0);
}
@@ -1065,7 +1068,6 @@
clear_pcb_flags(pcb, PCB_FPUNOSAVE | PCB_FPUINITDONE);
start_emulating();
- critical_exit();
} else {
KASSERT((ctx->flags & FPU_KERN_CTX_INUSE) != 0,
("leaving not inuse ctx"));
@@ -1079,7 +1081,6 @@
critical_enter();
if (curthread == PCPU_GET(fpcurthread))
fpudrop();
- critical_exit();
pcb->pcb_save = ctx->prev;
}
@@ -1096,6 +1097,7 @@
clear_pcb_flags(pcb, PCB_FPUINITDONE);
KASSERT(!PCB_USER_FPU(pcb), ("unpaired fpu_kern_leave"));
}
+ critical_exit();
return (0);
}
--- sys/amd64/amd64/machdep.c.orig
+++ sys/amd64/amd64/machdep.c
@@ -2158,8 +2158,10 @@
set_fpregs(struct thread *td, struct fpreg *fpregs)
{
+ critical_enter();
set_fpregs_xmm(fpregs, get_pcb_user_save_td(td));
fpuuserinited(td);
+ critical_exit();
return (0);
}
--- sys/i386/i386/machdep.c.orig
+++ sys/i386/i386/machdep.c
@@ -3004,6 +3004,7 @@
set_fpregs(struct thread *td, struct fpreg *fpregs)
{
+ critical_enter();
if (cpu_fxsr)
npx_set_fpregs_xmm((struct save87 *)fpregs,
&get_pcb_user_save_td(td)->sv_xmm);
@@ -3011,6 +3012,7 @@
bcopy(fpregs, &get_pcb_user_save_td(td)->sv_87,
sizeof(*fpregs));
npxuserinited(td);
+ critical_exit();
return (0);
}
--- sys/i386/isa/npx.c.orig
+++ sys/i386/isa/npx.c
@@ -974,14 +974,15 @@
return (_MC_FPOWNED_NONE);
pcb = td->td_pcb;
+ critical_enter();
if ((pcb->pcb_flags & PCB_NPXINITDONE) == 0) {
bcopy(npx_initialstate, get_pcb_user_save_pcb(pcb),
cpu_max_ext_state_size);
SET_FPU_CW(get_pcb_user_save_pcb(pcb), pcb->pcb_initial_npxcw);
npxuserinited(td);
+ critical_exit();
return (_MC_FPOWNED_PCB);
}
- critical_enter();
if (td == PCPU_GET(fpcurthread)) {
fpusave(get_pcb_user_save_pcb(pcb));
if (!cpu_fxsr)
@@ -995,7 +996,6 @@
} else {
owned = _MC_FPOWNED_PCB;
}
- critical_exit();
if (use_xsave) {
/*
* Handle partially saved state.
@@ -1018,6 +1018,7 @@
*xstate_bv |= bit;
}
}
+ critical_exit();
return (owned);
}
@@ -1026,6 +1027,7 @@
{
struct pcb *pcb;
+ CRITICAL_ASSERT(td);
pcb = td->td_pcb;
if (PCB_USER_FPU(pcb))
pcb->pcb_flags |= PCB_NPXINITDONE;
@@ -1083,28 +1085,26 @@
if (cpu_fxsr)
addr->sv_xmm.sv_env.en_mxcsr &= cpu_mxcsr_mask;
pcb = td->td_pcb;
+ error = 0;
critical_enter();
if (td == PCPU_GET(fpcurthread) && PCB_USER_FPU(pcb)) {
error = npxsetxstate(td, xfpustate, xfpustate_size);
- if (error != 0) {
- critical_exit();
- return (error);
+ if (error == 0) {
+ if (!cpu_fxsr)
+ fnclex(); /* As in npxdrop(). */
+ bcopy(addr, get_pcb_user_save_td(td), sizeof(*addr));
+ fpurstor(get_pcb_user_save_td(td));
+ pcb->pcb_flags |= PCB_NPXUSERINITDONE | PCB_NPXINITDONE;
}
- if (!cpu_fxsr)
- fnclex(); /* As in npxdrop(). */
- bcopy(addr, get_pcb_user_save_td(td), sizeof(*addr));
- fpurstor(get_pcb_user_save_td(td));
- critical_exit();
- pcb->pcb_flags |= PCB_NPXUSERINITDONE | PCB_NPXINITDONE;
} else {
- critical_exit();
error = npxsetxstate(td, xfpustate, xfpustate_size);
- if (error != 0)
- return (error);
- bcopy(addr, get_pcb_user_save_td(td), sizeof(*addr));
- npxuserinited(td);
+ if (error == 0) {
+ bcopy(addr, get_pcb_user_save_td(td), sizeof(*addr));
+ npxuserinited(td);
+ }
}
- return (0);
+ critical_exit();
+ return (error);
}
static void
@@ -1373,6 +1373,7 @@
return (0);
}
pcb = td->td_pcb;
+ critical_enter();
KASSERT(!PCB_USER_FPU(pcb) || pcb->pcb_save ==
get_pcb_user_save_pcb(pcb), ("mangled pcb_save"));
ctx->flags = FPU_KERN_CTX_INUSE;
@@ -1383,6 +1384,7 @@
pcb->pcb_save = fpu_kern_ctx_savefpu(ctx);
pcb->pcb_flags |= PCB_KERNNPX;
pcb->pcb_flags &= ~PCB_NPXINITDONE;
+ critical_exit();
return (0);
}
@@ -1401,7 +1403,6 @@
critical_enter();
if (curthread == PCPU_GET(fpcurthread))
npxdrop();
- critical_exit();
pcb->pcb_save = ctx->prev;
if (pcb->pcb_save == get_pcb_user_save_pcb(pcb)) {
if ((pcb->pcb_flags & PCB_NPXUSERINITDONE) != 0)
@@ -1416,6 +1417,7 @@
pcb->pcb_flags &= ~PCB_NPXINITDONE;
KASSERT(!PCB_USER_FPU(pcb), ("unpaired fpu_kern_leave"));
}
+ critical_exit();
return (0);
}

18
share/security/patches/EN-18:08/lazyfpu-11.patch.asc Normal file
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@ -0,0 +1,18 @@
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iQKTBAABCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAluYoMlfFIAAAAAALgAo
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=EN9Q
-----END PGP SIGNATURE-----

35
share/security/patches/SA-18:12/elf.patch Normal file
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@ -0,0 +1,35 @@
--- sys/kern/imgact_elf.c.orig
+++ sys/kern/imgact_elf.c
@@ -839,7 +839,8 @@
break;
case PT_INTERP:
/* Path to interpreter */
- if (phdr[i].p_filesz > MAXPATHLEN) {
+ if (phdr[i].p_filesz < 2 ||
+ phdr[i].p_filesz > MAXPATHLEN) {
uprintf("Invalid PT_INTERP\n");
error = ENOEXEC;
goto ret;
@@ -870,6 +871,11 @@
} else {
interp = __DECONST(char *, imgp->image_header) +
phdr[i].p_offset;
+ if (interp[interp_name_len - 1] != '\0') {
+ uprintf("Invalid PT_INTERP\n");
+ error = ENOEXEC;
+ goto ret;
+ }
}
break;
case PT_GNU_STACK:
--- sys/kern/vfs_vnops.c.orig
+++ sys/kern/vfs_vnops.c
@@ -528,6 +528,8 @@
struct vn_io_fault_args args;
int error, lock_flags;
+ if (offset < 0 && vp->v_type != VCHR)
+ return (EINVAL);
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
aiov.iov_base = base;

18
share/security/patches/SA-18:12/elf.patch.asc Normal file
View file

@ -0,0 +1,18 @@
-----BEGIN PGP SIGNATURE-----
iQKTBAABCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAluYoM1fFIAAAAAALgAo
aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD
MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n
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YV8X9uOp6tB8ahkG0S+EbfH7X3o8MC/Q5hlQavmh/biQP44EU/QwqC47DudSpG3m
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=KOL2
-----END PGP SIGNATURE-----

13
share/xml/advisories.xml
View file

@ -7,6 +7,19 @@
<year>
<name>2018</name>
<month>
<name>9</name>
<day>
<name>12</name>
<advisory>
<name>FreeBSD-SA-18:12.elf</name>
</advisory>
</day>
</month>
<month>
<name>8</name>

13
share/xml/notices.xml
View file

@ -7,6 +7,19 @@
<year>
<name>2018</name>
<month>
<name>9</name>
<day>
<name>12</name>
<notice>
<name>FreeBSD-EN-18:08.lazyfpu</name>
</notice>
</day>
</month>
<month>
<name>6</name>