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kfence: use pt_regs to generate stack trace on faults

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Instead of removing the fault handling portion of the stack trace based on
the fault handler's name, just use struct pt_regs directly.

Change kfence_handle_page_fault() to take a struct pt_regs, and plumb it
through to kfence_report_error() for out-of-bounds, use-after-free, or
invalid access errors, where pt_regs is used to generate the stack trace.

If the kernel is a DEBUG_KERNEL, also show registers for more information.

Link: https://lkml.kernel.org/r/20201105092133.2075331-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jann Horn <jannh@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Marco Elver
2021-02-25 17:19:08 -08:00
committed by Linus Torvalds
parent 840b239863
commit d438fabce7
8 changed files with 48 additions and 46 deletions
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5
include/linux/kfence.h
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@@ -186,6 +186,7 @@ static __always_inline __must_check bool kfence_free(void *addr)
/**
* kfence_handle_page_fault() - perform page fault handling for KFENCE pages
* @addr: faulting address
* @regs: current struct pt_regs (can be NULL, but shows full stack trace)
*
* Return:
* * false - address outside KFENCE pool,
@@ -196,7 +197,7 @@ static __always_inline __must_check bool kfence_free(void *addr)
* cases KFENCE prints an error message and marks the offending page as
* present, so that the kernel can proceed.
*/
bool __must_check kfence_handle_page_fault(unsigned long addr);
bool __must_check kfence_handle_page_fault(unsigned long addr, struct pt_regs *regs);
#else /* CONFIG_KFENCE */
@@ -209,7 +210,7 @@ static inline size_t kfence_ksize(const void *addr) { return 0; }
static inline void *kfence_object_start(const void *addr) { return NULL; }
static inline void __kfence_free(void *addr) { }
static inline bool __must_check kfence_free(void *addr) { return false; }
static inline bool __must_check kfence_handle_page_fault(unsigned long addr) { return false; }
static inline bool __must_check kfence_handle_page_fault(unsigned long addr, struct pt_regs *regs) { return false; }
#endif