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069e1c07c1
linux/kernel/bpf
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Naveen N. Rao ede7c460b1 bpf: handle 32-bit zext during constant blinding 
Since BPF constant blinding is performed after the verifier pass, the
ALU32 instructions inserted for doubleword immediate loads don't have a
corresponding zext instruction. This is causing a kernel oops on powerpc
and can be reproduced by running 'test_cgroup_storage' with
bpf_jit_harden=2.

Fix this by emitting BPF_ZEXT during constant blinding if
prog->aux->verifier_zext is set.

Fixes: a4b1d3c1dd ("bpf: verifier: insert zero extension according to analysis result")
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-08-26 23:05:01 +02:00
..
arraymap.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-17 20:20:36 -07:00
bpf_lru_list.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
bpf_lru_list.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
btf.c bpf: fix BTF verifier size resolution logic 2019-07-15 23:02:17 +02:00
cgroup.c bpf: cgroup: Fix build error without CONFIG_NET 2019-07-08 17:17:00 +02:00
core.c bpf: handle 32-bit zext during constant blinding 2019-08-26 23:05:01 +02:00
cpumap.c devmap/cpumap: Use flush list instead of bitmap 2019-06-29 01:31:08 +02:00
devmap.c devmap: Allow map lookups from eBPF 2019-06-29 01:31:09 +02:00
disasm.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295 2019-06-05 17:36:38 +02:00
disasm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295 2019-06-05 17:36:38 +02:00
hashtab.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-17 20:20:36 -07:00
helpers.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295 2019-06-05 17:36:38 +02:00
inode.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
local_storage.c bpf: move memory size checks to bpf_map_charge_init() 2019-05-31 16:52:56 -07:00
lpm_trie.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-22 08:59:24 -04:00
Makefile bpf: silence warning messages in core 2019-06-12 16:51:02 +02:00
map_in_map.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
map_in_map.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
offload.c bpf: offload: add priv field for drivers 2019-02-12 17:07:09 +01:00
percpu_freelist.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
percpu_freelist.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
queue_stack_maps.c bpf: move memory size checks to bpf_map_charge_init() 2019-05-31 16:52:56 -07:00
reuseport_array.c bpf: move memory size checks to bpf_map_charge_init() 2019-05-31 16:52:56 -07:00
stackmap.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-07 11:00:14 -07:00
syscall.c bpf: fix use after free in prog symbol exposure 2019-08-24 01:17:47 +02:00
tnum.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
verifier.c bpf: fix precision tracking in presence of bpf2bpf calls 2019-08-24 01:17:12 +02:00
xskmap.c xskmap: Move non-standard list manipulation to helper 2019-06-29 01:31:08 +02:00