diff options
| author | Kees Cook <keescook@chromium.org> | 2018-10-30 22:12:56 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2018-11-08 10:59:10 +0000 |
| commit | e46daee53bb50bde38805f1823a182979724c229 (patch) | |
| tree | 4fddda4f42739fd0cabfd7acea1a52a620365ada /arch/arm/probes | |
| parent | 651022382c7f8da46cb4872a545ee1da6d097d2a (diff) | |
| download | lwn-e46daee53bb50bde38805f1823a182979724c229.tar.gz lwn-e46daee53bb50bde38805f1823a182979724c229.zip | |
ARM: 8806/1: kprobes: Fix false positive with FORTIFY_SOURCE
The arm compiler internally interprets an inline assembly label
as an unsigned long value, not a pointer. As a result, under
CONFIG_FORTIFY_SOURCE, the address of a label has a size of 4 bytes,
which was tripping the runtime checks. Instead, we can just cast the label
(as done with the size calculations earlier).
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1639397
Reported-by: William Cohen <wcohen@redhat.com>
Fixes: 6974f0c4555e ("include/linux/string.h: add the option of fortified string.h functions")
Cc: stable@vger.kernel.org
Acked-by: Laura Abbott <labbott@redhat.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: William Cohen <wcohen@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/probes')
| -rw-r--r-- | arch/arm/probes/kprobes/opt-arm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/probes/kprobes/opt-arm.c b/arch/arm/probes/kprobes/opt-arm.c index b2aa9b32bff2..2c118a6ab358 100644 --- a/arch/arm/probes/kprobes/opt-arm.c +++ b/arch/arm/probes/kprobes/opt-arm.c @@ -247,7 +247,7 @@ int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *or } /* Copy arch-dep-instance from template. */ - memcpy(code, &optprobe_template_entry, + memcpy(code, (unsigned char *)optprobe_template_entry, TMPL_END_IDX * sizeof(kprobe_opcode_t)); /* Adjust buffer according to instruction. */ |