Messages in this thread Patch in this message | | | Date | Thu, 19 Apr 2012 11:24:51 +0200 | From | Borislav Petkov <> | Subject | [PATCH 1/3] x86, extable: Cleanup fixup_exception |
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From 74643bebf6b592f179974caa033f2f095d28bb74 Mon Sep 17 00:00:00 2001 From: Borislav Petkov <bp@alien8.de> Date: Sat, 31 Mar 2012 16:29:03 +0200 Subject: [PATCH 1/3] x86, extable: Cleanup fixup_exception
And especially, fork out the CONFIG_PNPBIOS lump into its own function and salvage a tab by inverting error code checking.
No functionality change.
Signed-off-by: Borislav Petkov <bp@alien8.de> --- arch/x86/mm/extable.c | 33 ++++++++++++++++++--------------- 1 files changed, 18 insertions(+), 15 deletions(-)
diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c index 1fb85dbe390a..08aecb0d3132 100644 --- a/arch/x86/mm/extable.c +++ b/arch/x86/mm/extable.c @@ -2,13 +2,10 @@ #include <linux/spinlock.h> #include <asm/uaccess.h> - -int fixup_exception(struct pt_regs *regs) +static void pnp_bios_is_crap(unsigned long cs) { - const struct exception_table_entry *fixup; - #ifdef CONFIG_PNPBIOS - if (unlikely(SEGMENT_IS_PNP_CODE(regs->cs))) { + if (unlikely(SEGMENT_IS_PNP_CODE(cs))) { extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp; extern u32 pnp_bios_is_utter_crap; pnp_bios_is_utter_crap = 1; @@ -20,18 +17,24 @@ int fixup_exception(struct pt_regs *regs) panic("do_trap: can't hit this"); } #endif +} + +int fixup_exception(struct pt_regs *regs) +{ + const struct exception_table_entry *fixup; + + pnp_bios_is_crap(regs->cs); fixup = search_exception_tables(regs->ip); - if (fixup) { - /* If fixup is less than 16, it means uaccess error */ - if (fixup->fixup < 16) { - current_thread_info()->uaccess_err = 1; - regs->ip += fixup->fixup; - return 1; - } - regs->ip = fixup->fixup; + if (!fixup) + return 0; + + /* If fixup is less than 16, it means uaccess error */ + if (fixup->fixup < 16) { + current_thread_info()->uaccess_err = 1; + regs->ip += fixup->fixup; return 1; } - - return 0; + regs->ip = fixup->fixup; + return 1; } -- 1.7.5.3.401.gfb674 -- Regards/Gruss, Boris.
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