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| author | Ingo Molnar <mingo@elte.hu> | 2009-02-21 00:18:08 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-02-21 02:09:41 +0300 |
| commit | 121d5d0a7e5808fbcfda484efd7ba840ac93450f (patch) | |
| tree | 666785943c648f8119b8533c9b640dbc37fb23b4 /arch/x86/mm/fault.c | |
| parent | 8c938f9fae887f6e180bf802aa1c33cf74712aff (diff) | |
| download | linux-121d5d0a7e5808fbcfda484efd7ba840ac93450f.tar.xz | |
x86, mm: fault.c, enable PF_RSVD checks on 32-bit too
Impact: improve page fault handling robustness
The 'PF_RSVD' flag (bit 3) of the page-fault error_code is a
relatively recent addition to x86 CPUs, so the 32-bit do_fault()
implementation never had it. This flag gets set when the CPU
detects nonzero values in any reserved bits of the page directory
entries.
Extend the existing 64-bit check for PF_RSVD in do_page_fault()
to 32-bit too. If we detect such a fault then we print a more
informative oops and the pagetables.
This unifies the code some more, removes an ugly #ifdef and improves
the 32-bit page fault code robustness a bit. It slightly increases
the 32-bit kernel text size.
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/fault.c')
| -rw-r--r-- | arch/x86/mm/fault.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 7dc0615c3cfe..3e3661462739 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -477,7 +477,6 @@ show_fault_oops(struct pt_regs *regs, unsigned long error_code, dump_pagetable(address); } -#ifdef CONFIG_X86_64 static noinline void pgtable_bad(struct pt_regs *regs, unsigned long error_code, unsigned long address) @@ -503,7 +502,6 @@ pgtable_bad(struct pt_regs *regs, unsigned long error_code, oops_end(flags, regs, sig); } -#endif static noinline void no_context(struct pt_regs *regs, unsigned long error_code, @@ -1015,10 +1013,8 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code) local_irq_enable(); } -#ifdef CONFIG_X86_64 if (unlikely(error_code & PF_RSVD)) pgtable_bad(regs, error_code, address); -#endif /* * If we're in an interrupt, have no user context or are running |