hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

powerpc/security: Fix spectre_v2 reporting 

When I updated the spectre_v2 reporting to handle software count cache
flush I got the logic wrong when there's no software count cache
enabled at all.

The result is that on systems with the software count cache flush
disabled we print:

  Mitigation: Indirect branch cache disabled, Software count cache flush

Which correctly indicates that the count cache is disabled, but
incorrectly says the software count cache flush is enabled.

The root of the problem is that we are trying to handle all
combinations of options. But we know now that we only expect to see
the software count cache flush enabled if the other options are false.

So split the two cases, which simplifies the logic and fixes the bug.
We were also missing a space before "(hardware accelerated)".

The result is we see one of:

  Mitigation: Indirect branch serialisation (kernel only)
  Mitigation: Indirect branch cache disabled
  Mitigation: Software count cache flush
  Mitigation: Software count cache flush (hardware accelerated)

Fixes: ee13cb249f ("powerpc/64s: Add support for software count cache flush")
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Michael Neuling <mikey@neuling.org>
Reviewed-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2019-03-21 15:24:33 +11:00
parent 8bc0868998
commit 92edf8df0f
1 changed files with 8 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/powerpc/kernel/security.c
View File

@ -190,29 +190,22 @@ ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, c
bcs = security_ftr_enabled(SEC_FTR_BCCTRL_SERIALISED);
ccd = security_ftr_enabled(SEC_FTR_COUNT_CACHE_DISABLED);
if (bcs || ccd || count_cache_flush_type != COUNT_CACHE_FLUSH_NONE) {
bool comma = false;
if (bcs || ccd) {
seq_buf_printf(&s, "Mitigation: ");
if (bcs) {
if (bcs)
seq_buf_printf(&s, "Indirect branch serialisation (kernel only)");
comma = true;
}
if (ccd) {
if (comma)
seq_buf_printf(&s, ", ");
seq_buf_printf(&s, "Indirect branch cache disabled");
comma = true;
}
if (comma)
if (bcs && ccd)
seq_buf_printf(&s, ", ");
seq_buf_printf(&s, "Software count cache flush");
if (ccd)
seq_buf_printf(&s, "Indirect branch cache disabled");
} else if (count_cache_flush_type != COUNT_CACHE_FLUSH_NONE) {
seq_buf_printf(&s, "Mitigation: Software count cache flush");
if (count_cache_flush_type == COUNT_CACHE_FLUSH_HW)
seq_buf_printf(&s, "(hardware accelerated)");
seq_buf_printf(&s, " (hardware accelerated)");
} else if (btb_flush_enabled) {
seq_buf_printf(&s, "Mitigation: Branch predictor state flush");
} else {