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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-11-27 07:44:14 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-03 17:01:26 +0300 |
| commit | d5fa30e6993ffcdd1859d8dab1a07a6f6c6e7c3f (patch) | |
| tree | 69bb6b2eb8e0488a5228288cc2073d47ac706191 /arch/powerpc/kernel/process.c | |
| parent | f643fcab74c005ddfdda68c69909f03bde766ff1 (diff) | |
| download | linux-d5fa30e6993ffcdd1859d8dab1a07a6f6c6e7c3f.tar.xz | |
powerpc/book3s64/pkeys: Reset userspace AMR correctly on exec
On fork, we inherit from the parent and on exec, we should switch to default_amr values.
Also, avoid changing the AMR register value within the kernel. The kernel now runs with
different AMR values.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201127044424.40686-13-aneesh.kumar@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 2ec907a6f9af..0538e0f1790c 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1546,6 +1546,11 @@ void arch_setup_new_exec(void) struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; current->thread.regs = regs - 1; } + +#ifdef CONFIG_PPC_MEM_KEYS + current->thread.regs->amr = default_amr; + current->thread.regs->iamr = default_iamr; +#endif } #ifdef CONFIG_PPC64 @@ -1895,7 +1900,6 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) current->thread.load_tm = 0; #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ - thread_pkey_regs_init(¤t->thread); } EXPORT_SYMBOL(start_thread); |