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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-04-27 08:36:43 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-29 12:33:16 +0300 |
| commit | 5787b55b50196ad1e462789acc49d5bcefff57fb (patch) | |
| tree | 53840c5f837bfda9c2ad15bdc25346c676f258aa | |
| parent | f836b34fb0562cf193a076769a5adf71b030f59f (diff) | |
| download | linux-5787b55b50196ad1e462789acc49d5bcefff57fb.tar.xz | |
s390: correct module section names for expoline code revert
[ Upstream commit 6cf09958f32b9667bb3ebadf74367c791112771b ]
The main linker script vmlinux.lds.S for the kernel image merges
the expoline code patch tables into two section ".nospec_call_table"
and ".nospec_return_table". This is *not* done for the modules,
there the sections retain their original names as generated by gcc:
".s390_indirect_call", ".s390_return_mem" and ".s390_return_reg".
The module_finalize code has to check for the compiler generated
section names, otherwise no code patching is done. This slows down
the module code in case of "spectre_v2=off".
Cc: stable@vger.kernel.org # 4.16
Fixes: f19fbd5ed6 ("s390: introduce execute-trampolines for branches")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/s390/kernel/module.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c index 7b337f85ca2f..b441e069e674 100644 --- a/arch/s390/kernel/module.c +++ b/arch/s390/kernel/module.c @@ -478,11 +478,11 @@ int module_finalize(const Elf_Ehdr *hdr, apply_alternatives(aseg, aseg + s->sh_size); if (IS_ENABLED(CONFIG_EXPOLINE) && - (!strcmp(".nospec_call_table", secname))) + (!strncmp(".s390_indirect", secname, 14))) nospec_revert(aseg, aseg + s->sh_size); if (IS_ENABLED(CONFIG_EXPOLINE) && - (!strcmp(".nospec_return_table", secname))) + (!strncmp(".s390_return", secname, 12))) nospec_revert(aseg, aseg + s->sh_size); } |