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authorJann Horn <jannh@google.com>2018-08-28 17:49:01 +0200
committerThomas Gleixner <tglx@linutronix.de>2018-08-31 17:08:22 +0200
commit342db04ae71273322f0011384a9ed414df8bdae4 (patch)
treef33e103e7d44f50f47cd4358189862a2e2381a37 /arch/x86/Makefile
parent26e609eccd37967d3681662433086894830c5d62 (diff)
downloadlinux-342db04ae71273322f0011384a9ed414df8bdae4.tar.gz
x86/dumpstack: Don't dump kernel memory based on usermode RIP
show_opcodes() is used both for dumping kernel instructions and for dumping user instructions. If userspace causes #PF by jumping to a kernel address, show_opcodes() can be reached with regs->ip controlled by the user, pointing to kernel code. Make sure that userspace can't trick us into dumping kernel memory into dmesg. Fixes: 7cccf0725cf7 ("x86/dumpstack: Add a show_ip() function") Signed-off-by: Jann Horn <jannh@google.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: security@kernel.org Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20180828154901.112726-1-jannh@google.com
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