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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2018-11-28 10:27:04 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-12-21 06:20:45 +0100 |
| commit | ffca395b11c4a5a6df6d6345f794b0e3d578e2d0 (patch) | |
| tree | 10b8d6e33709d3103e97f725effb7a6cdc608175 /arch/powerpc/mm/fault.c | |
| parent | powerpc: generate uapi header and system call table files (diff) | |
| download | linux-ffca395b11c4a5a6df6d6345f794b0e3d578e2d0.tar.xz linux-ffca395b11c4a5a6df6d6345f794b0e3d578e2d0.zip | |
powerpc/mm: Fix reporting of kernel execute faults on the 8xx
On the 8xx, no-execute is set via PPP bits in the PTE. Therefore
a no-exec fault generates DSISR_PROTFAULT error bits,
not DSISR_NOEXEC_OR_G.
This patch adds DSISR_PROTFAULT in the test mask.
Fixes: d3ca587404b3 ("powerpc/mm: Fix reporting of kernel execute faults")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/fault.c')
| -rw-r--r-- | arch/powerpc/mm/fault.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index c866d9a710fe..056b750071bb 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -226,7 +226,9 @@ static int mm_fault_error(struct pt_regs *regs, unsigned long addr, static bool bad_kernel_fault(bool is_exec, unsigned long error_code, unsigned long address) { - if (is_exec && (error_code & (DSISR_NOEXEC_OR_G | DSISR_KEYFAULT))) { + /* NX faults set DSISR_PROTFAULT on the 8xx, DSISR_NOEXEC_OR_G on others */ + if (is_exec && (error_code & (DSISR_NOEXEC_OR_G | DSISR_KEYFAULT | + DSISR_PROTFAULT))) { printk_ratelimited(KERN_CRIT "kernel tried to execute" " exec-protected page (%lx) -" "exploit attempt? (uid: %d)\n", |