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| author | Jann Horn <[email protected]> | 2018-08-28 15:49:01 +0000 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2018-08-31 15:08:22 +0000 |
| commit | 342db04ae71273322f0011384a9ed414df8bdae4 (patch) | |
| tree | f33e103e7d44f50f47cd4358189862a2e2381a37 /arch/powerpc/lib/code-patching.c | |
| parent | x86/asm: Use CC_SET()/CC_OUT() in __gen_sigismember() (diff) | |
| download | kernel-342db04ae71273322f0011384a9ed414df8bdae4.tar.gz kernel-342db04ae71273322f0011384a9ed414df8bdae4.zip | |
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 <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Borislav Petkov <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'arch/powerpc/lib/code-patching.c')
0 files changed, 0 insertions, 0 deletions