Summary: When compiling for ELFv2, it is necessary to adjust the offset to
get_spr and factor in the function prologue to ensure the correct instruction is
being edited.
Test Plan:
Before:
```
db> show spr 110
KDB: reentering
KDB: stack backtrace:
0xc008000020fb96e0: at 0xc000000002bb2e34 = kdb_backtrace+0x68
0xc008000020fb97f0: at 0xc000000002bb3798 = kdb_reenter+0x54
0xc008000020fb9860: at 0xc000000002f87090 = trap+0x4e4
0xc008000020fb9990: at 0xc000000002f78a60 = powerpc_interrupt+0x110
0xc008000020fb9a20: kernel trap 0xe40 by 0xc000000002401978 = get_spr+0x8: srr1=0x9000000000001032
r1=0xc008000020fb9cd0 cr=0x80009438 xer=0x20040000 ctr=0xc000000002f7b40c r2=0xc0000000037fd000
saved LR(0xfffffffffffffffb) is invalid.
```
After:
```
db> show spr 110
SPR 272(110): c000000003cae900
```
Submitted by: git_bdragon.rtk0.net
Differential Revision: https://reviews.freebsd.org/D17813
It seems this tag is causing problems on POWER9 systems. Since no POWER9 user
has encountered the problem fixed by r339589 just restrict it to POWER8 for now.
A better fix will likely be to update powerpc/busdma_machdep.c to handle the
window correctly.
Reported by: mmacy, others
icmp_error allocates either an mbuf (with pkthdr) or a cluster depending
on the size of data to be quoted in the ICMP reply, but the calculation
failed to account for the additional padding that m_align may apply.
Include the ip header in the size passed to m_align. On 64-bit archs
this will have the net effect of moving everything 4 bytes later in the
mbuf or cluster. This will result in slightly pessimal alignment for
the ICMP data copy.
Also add an assertion that we do not move m_data before the beginning of
the mbuf or cluster.
Reported by: A reddit user
Reviewed by: bz, jtl
MFC after: 3 days
Security: CVE-2018-17156
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D17909
If another thread immediately removes the link-local address
added by in6_update_ifa(), in6ifa_ifpforlinklocal() can return NULL,
so the following assertion (or dereference) is wrong.
Remove the assertion, and handle NULL somewhat better than panicking.
This matches all of the other callers of in6_update_ifa().
PR: 219250
Reviewed by: bz, dab (both an earlier version)
MFC after: 1 week
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D17898
From Jake:
The iflib stack does not disable TSO automatically when TXCSUM is
disabled, instead assuming that the driver will correctly handle TSOs
even when CSUM_IP is not set.
This results in iflib calling ixl_isc_txd_encap with packets which have
CSUM_IP_TSO, but do not have CSUM_IP or CSUM_IP_TCP set. Because of
this, ixl_tx_setup_offload will not setup the IPv4 checksum offloading.
This results in bad TSO packets being sent if a user disables TXCSUM
without disabling TSO.
Fix this by updating the ixl_tx_setup_offload function to check both
CSUM_IP and CSUM_IP_TSO when deciding whether to enable IPv4 checksums.
Once this is corrected, another issue for TSO packets is revealed. The
driver sets IFLIB_NEED_ZERO_CSUM in order to enable a work around that
causes the ip->sum field to be zero'd. This is necessary for ixl
hardware to correctly perform TSOs.
However, if TXCSUM is disabled, then the work around is not enabled, as
CSUM_IP will not be set when the iflib stack checks to see if it should
clear the sum field.
Fix this by adding IFLIB_TSO_INIT_IP to the iflib flags for the iavf and
ixl interface files.
It is uncertain if the hardware needs IFLIB_NEED_ZERO_CSUM for any other
case besides TSO, so leave that flag assigned. It may be worth
investigating to see if this work around flag could be disabled in
a future change.
Once both of these changes are made, the ixl driver should correctly
offload TSO packets when TSO4 offload is enabled, regardless of whether
TXCSUM is enabled or disabled.
Submitted by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed by: erj@, shurd@
MFC after: 0 days
Sponsored by: Intel Corporation
Differential Revision: https://reviews.freebsd.org/D17900
Both Intel manual and Agner Fog's docs suggest aligning to 16.
See the review for benchmark results.
Reviewed by: kib (previous version)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D17661
This was introduced in r326329 and explains the crashes mentioned in
the commit log message for r339934. In particular, on INVARIANTS
kernels, UMA trashing causes the loop to exit early, leaving swap
blocks behind when they should have been freed. After r336984 this
became more problematic since new anonymous mappings were more
likely to reuse swapped-out subranges of existing VM objects, so faults
would trigger pageins of freed memory rather than returning zeroed
pages.
Reviewed by: kib
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D17897
When reproducible build mode is enabled vers.c may be unchanged between
successive builds. In this case avoid changing the file's metadata so
that it does not cause dependent targets to be rebuilt.
Sponsored by: The FreeBSD Foundation
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D17892
r338838 attempted to fix issues with rxcsum and rxcsum6.
However, the rxcsum bits were set as though if_setcapenablebit() was
being called, not if_togglecapenable() which is in use. As a result,
it was not possible to disable rxcsum when rxcsum6 was supported.
PR: 233004
Reported by: lev
Reviewed by: lev
MFC after: 3 days
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D17881
These architectures never shipped binaries with an rtld path of
/usr/libexec/ld-elf.so.1.
Reviewed by: markj
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D17876
machine/vmparam.h already defines the SHAREDPAGE constant. This
change just enables it for ELF executables. The only use of the
shared page currently is to hold the signal trampoline.
Reviewed by: markj, kib
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D17875
The previous code required that the return type be a single word. This
allows it to be a pointer without using a typedef.
Update the return types of break, mmap, and shmat to be void * as
declared. This only effects systrace output in-tree, but can aid in
generating system call wrappers from syscalls.master.
Reviewed by: kib
Obtained from: CheriBSD
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D17873
i/o into last_sector+N is handled differently for N==1 and N>1 cases to
accomodate that, so some other approach would be needed to fix DIOCGDELETE
ioctl(2).
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
transaction translator will return a NAK. Ignore this message and
retry the complete split instead.
MFC after: 3 days
Sponsored by: Mellanox Technologies
'sync' is pretty heavy-handed, and is unnecessary for this use case. It's a
full barrier, which is applicable for all storage types. However,
atomic_load_acq_*() is only expected to operate on physical memory, not
device memory, so lwsync is sufficient (lwsync provides access ordering on
memory that is marked as Coherency Required and is not Write Through nor
Cache Inhibited). On 32-bit systems, this is a nop, since powerpc_lwsync()
is defined to use sync, as a workaround for a silicon bug in the Freescale
e500 core.
Different compilation units may otherwise get a different view of the
layout of struct tty depending on whether they include opt_printf.h.
This caused a blowup in the number of types defined in the kernel's
CTF file after r339468; thanks to dim@ for bisecting down to that
revision.
PR: 232675
Reported by: dim
Reviewed by: cem (previous version)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D17877
Prior to this patch, nfs_advlock() did NFSVOPUNLOCK(); return (error);
in many places. This patch replaces these code sequenences with a "goto out;"
and does the NFSVOPUNLOCK(); return (error); at the end of the function
in order to make the vnode locking simpler.
This patch does not change the semantics of nfs_advlock().
Suggested by: kib
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D17853
Previously attempts to read the MC region were failing since the
length was greater than 2^31.
Reviewed by: np
MFC after: 2 months
Differential Revision: https://reviews.freebsd.org/D17857
These submaps are used for mapping pipe buffers and execv() argument
strings respectively, so there's no need for such mappings to have
execute permissions.
Reported by: jhb
Reviewed by: alc, jhb, kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D17827
Leave ptrace(2) alone for the moment as it's defined to take a caddr_t.
Reviewed by: kib
Obtained from: CheriBSD
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D17852
This allows us to build the ubsan code added in r340189 into the kernel
with the KUBSAN option. This will report when undefined behaviour is
detected in the currently running kernel.
As it can be large, the kernel is 65MB on arm64, loader may not be able to
load the kernel on all architectures so is disabled by default for now.
Sponsored by: DARPA, AFRL
This imports revision 1.3 of common/lib/libc/misc/ubsan.c from NetBSD, the
micro-ubsan code. It is an implementation of the Undefined Behavior
Sanitizer runtime for use with recent clang and gcc.
The uubsan code will be used in a later commit to implement kubsan to help
find undefined behavior in the kernel.
Sponsored by: DARPA, AFRL
fully beyond the end of providers media. The only exception is made
for the zero length transfers which are allowed to be just on the
boundary. Previously, any requests starting on the boundary (i.e. next
byte after the last one) have been allowed to go through.
No response from: freebsd-geom@, phk
MFC after: 1 month
linux_ioctl_(un)register_handler that allows other driver modules to
register ioctl handlers. The ioctl syscall implementation in each Linux
compat module iterates over the list of handlers and forwards the call to
the appropriate driver. Because the registration functions have the same
name in each module it is not possible for a driver to support both 32 and
64 bit linux compatibility.
Move the list of ioctl handlers to linux_common.ko so it is shared by
both Linux modules and all drivers receive both 32 and 64 bit ioctl calls
with one registration. These ioctl handlers normally forward the call
to the FreeBSD ioctl handler which can handle both 32 and 64 bit.
Keep the special COMPAT_LINUX32 ioctl handlers in linux.ko in a separate
list for now and let the ioctl syscall iterate over that list first.
Later, COMPAT_LINUX32 support can be added to the 64 bit ioctl handlers
via a runtime check for ILP32 like is done for COMPAT_FREEBSD32 and then
this separate list would disappear again. That is a much bigger effort
however and this commit is meant to be MFCable.
This enables linux64 support in x11/nvidia-driver*.
PR: 206711
Reviewed by: kib
MFC after: 3 days
This is a valid case for the userland stack, where this fixes
two set-but-not-used warnings in this case.
Thanks to Christian Wright for reporting the issue.
In practice it is always initialized because nfreed must be positive
in order to trigger background laundering, but this isn't obvious.
CID: 1387997
MFC after: 1 week
- Use PH_loc.eight[1] as a general 'cflags' (Chelsio flags) field to
describe properties of a queued packet. The MC_RAW_WR flag
indicates an mbuf holding a raw work request. mbuf_cflags() returns
the current flags.
- Raw work request mbufs are allocated via alloc_wr_mbuf() which will
allocate a single contiguous range to hold the mbuf data. The
consumer can use mtod() to obtain the start of the work request and
write the required work request in the buffer. The mbuf can then be
enqueued directly to the txq via mp_ring_enqueue().
- Since raw work requests might potentially send arbitrary work
requests, only set the EQUIQ and EQUEQ bits on work requests that
support them such as the normal tunneled Ethernet packet work
requests.
Reviewed by: np
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D17811
Avoid using DELAY() since it can try to use spin locks on CPUs without
a P-state invariant TSC. For cpu_lock_delay(), always use the TSC if
it exists (even if it is not P-state invariant) to delay for a
microsecond. If the TSC does not exist, read from I/O port 0x84 to
delay instead.
PR: 228768
Reported by: Roger Hammerstein <cheeky.m@live.com>
Reviewed by: kib
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D17851
