Messages in this thread Patch in this message | | | Date | Wed, 20 Nov 2019 18:02:07 +0100 | Subject | [PATCH v4 3/4] x86/dumpstack: Split out header line printing from __die() | From | Jann Horn <> |
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Split __die() into __die_header() and __die_body(). This allows callers to insert extra information below the header line that initiates the bug report.
This can e.g. be used by __die() callers to allow KASAN to print additional information below the header line of the bug report.
Signed-off-by: Jann Horn <jannh@google.com> ---
Notes: I think that it's nicer to have KASAN's notes about the bug below the first oops line from the kernel. This also means that tools that work with kernel oops reports can just trigger on the "general protection fault" line with the die counter and so on, and just include the text from on there, and the KASAN message will automatically be included. But if you think that the code looks too ugly, I'd be happy to change that back and drop this patch from the series. v3: new patch v4: no changes
arch/x86/include/asm/kdebug.h | 3 +++ arch/x86/kernel/dumpstack.c | 13 ++++++++++++- 2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/kdebug.h b/arch/x86/include/asm/kdebug.h index 75f1e35e7c15..a0050fabce42 100644 --- a/arch/x86/include/asm/kdebug.h +++ b/arch/x86/include/asm/kdebug.h @@ -33,6 +33,9 @@ enum show_regs_mode { }; extern void die(const char *, struct pt_regs *,long); +extern void __die_header(const char *str, struct pt_regs *regs, long err); +extern int __must_check __die_body(const char *str, struct pt_regs *regs, + long err); extern int __must_check __die(const char *, struct pt_regs *, long); extern void show_stack_regs(struct pt_regs *regs); extern void __show_regs(struct pt_regs *regs, enum show_regs_mode); diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index e07424e19274..6436f3f5f803 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -365,7 +365,7 @@ void oops_end(unsigned long flags, struct pt_regs *regs, int signr) } NOKPROBE_SYMBOL(oops_end); -int __die(const char *str, struct pt_regs *regs, long err) +void __die_header(const char *str, struct pt_regs *regs, long err) { const char *pr = ""; @@ -384,7 +384,11 @@ int __die(const char *str, struct pt_regs *regs, long err) IS_ENABLED(CONFIG_KASAN) ? " KASAN" : "", IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION) ? (boot_cpu_has(X86_FEATURE_PTI) ? " PTI" : " NOPTI") : ""); +} +NOKPROBE_SYMBOL(__die_header); +int __die_body(const char *str, struct pt_regs *regs, long err) +{ show_regs(regs); print_modules(); @@ -394,6 +398,13 @@ int __die(const char *str, struct pt_regs *regs, long err) return 0; } +NOKPROBE_SYMBOL(__die_body); + +int __die(const char *str, struct pt_regs *regs, long err) +{ + __die_header(str, regs, err); + return __die_body(str, regs, err); +} NOKPROBE_SYMBOL(__die); /* -- 2.24.0.432.g9d3f5f5b63-goog
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