kprobes/x86: Use copy_from_kernel_nofault() to read from unsafe address

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Read from an unsafe address with copy_from_kernel_nofault() in
arch_adjust_kprobe_addr() because this function is used before checking
the address is in text or not. Syzcaller bot found a bug and reported
the case if user specifies inaccessible data area,
arch_adjust_kprobe_addr() will cause a kernel panic.

[ mingo: Clarified the comment. ]

Fixes: cc66bb9145 ("x86/ibt,kprobes: Cure sym+0 equals fentry woes")
Reported-by: Qiang Zhang <zzqq0103.hey@gmail.com>
Tested-by: Jinghao Jia <jinghao7@illinois.edu>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/171042945004.154897.2221804961882915806.stgit@devnote2

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Masami Hiramatsu (Google) 2024-03-15 00:17:30 +09:00 • committed by Ingo Molnar

parent e3f269ed0a

commit 4e51653d5d

1 changed files with 10 additions and 1 deletions

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arch/x86/kernel/kprobes/core.c

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