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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-08 15:33:21 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-08 15:33:21 +0200 |
| commit | ba1cb318dcbfc9754acda9656262aea97ebe77e6 (patch) | |
| tree | 770fadb8b2c77da5d4dd9d33535b2d7adcdb02fd /arch/powerpc/kernel/process.c | |
| parent | 8f523d6db7ed69f69720267af170c0719023f373 (diff) | |
| parent | 0238df646e6224016a45505d2c111a24669ebe21 (diff) | |
Merge 4.19-rc7 into char-misc-next
We want the fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 913c5725cdb2..bb6ac471a784 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1306,6 +1306,16 @@ void show_user_instructions(struct pt_regs *regs) pc = regs->nip - (instructions_to_print * 3 / 4 * sizeof(int)); + /* + * Make sure the NIP points at userspace, not kernel text/data or + * elsewhere. + */ + if (!__access_ok(pc, instructions_to_print * sizeof(int), USER_DS)) { + pr_info("%s[%d]: Bad NIP, not dumping instructions.\n", + current->comm, current->pid); + return; + } + pr_info("%s[%d]: code: ", current->comm, current->pid); for (i = 0; i < instructions_to_print; i++) { |