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authorIngo Molnar <mingo@elte.hu>2009-02-20 22:18:08 +0100
committerIngo Molnar <mingo@elte.hu>2009-02-21 00:09:41 +0100
commit121d5d0a7e5808fbcfda484efd7ba840ac93450f (patch)
tree666785943c648f8119b8533c9b640dbc37fb23b4 /arch
parent8c938f9fae887f6e180bf802aa1c33cf74712aff (diff)
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')
-rw-r--r--arch/x86/mm/fault.c4
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 7dc0615c3cf..3e366146273 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