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| author | Russell Currey <ruscur@russell.cc> | 2019-05-02 17:39:47 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-05-03 02:54:45 +1000 |
| commit | 453d87f6a8aed827f5ebb1708a4cea458fd68d23 (patch) | |
| tree | bc0424487d4f512ca6313ac84b03568784b19965 /arch/powerpc/mm/pgtable_64.c | |
| parent | 5f18cbdbdd42b050c51eb9859f8ce43db3f51846 (diff) | |
| download | linux-453d87f6a8aed827f5ebb1708a4cea458fd68d23.tar.bz2 | |
powerpc/mm: Warn if W+X pages found on boot
Implement code to walk all pages and warn if any are found to be both
writable and executable. Depends on STRICT_KERNEL_RWX enabled, and is
behind the DEBUG_WX config option.
This only runs on boot and has no runtime performance implications.
Very heavily influenced (and in some cases copied verbatim) from the
ARM64 code written by Laura Abbott (thanks!), since our ptdump
infrastructure is similar.
Signed-off-by: Russell Currey <ruscur@russell.cc>
[mpe: Fixup build error when disabled]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/pgtable_64.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable_64.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index 4c6a73782b19..d2d976ff8a0e 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -332,6 +332,9 @@ void mark_rodata_ro(void) radix__mark_rodata_ro(); else hash__mark_rodata_ro(); + + // mark_initmem_nx() should have already run by now + ptdump_check_wx(); } void mark_initmem_nx(void) |