Messages in this thread Patch in this message | | | From | <> | Subject | [PATCH v2 1/2] x86: corruption-check: Passing memory_corruption_check to command line causes panic | Date | Tue, 14 Aug 2018 23:33:42 +0800 |
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From: He Zhe <zhe.he@windriver.com>
memory_corruption_check[{_period|_size}]'s handlers do not check input argument before passing it to kstrtoul or simple_strtoull. The argument would be a NULL pointer if each of the kernel parameters, without its value, is set in command line and thus cause the following panic.
PANIC: early exception 0xe3 IP 10:ffffffff73587c22 error 0 cr2 0x0 [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.18-rc8+ #2 [ 0.000000] RIP: 0010:kstrtoull+0x2/0x10 ... [ 0.000000] Call Trace [ 0.000000] ? set_corruption_check+0x21/0x49 [ 0.000000] ? do_early_param+0x4d/0x82 [ 0.000000] ? parse_args+0x212/0x330 [ 0.000000] ? rdinit_setup+0x26/0x26 [ 0.000000] ? parse_early_options+0x20/0x23 [ 0.000000] ? rdinit_setup+0x26/0x26 [ 0.000000] ? parse_early_param+0x2d/0x39 [ 0.000000] ? setup_arch+0x2f7/0xbf4 [ 0.000000] ? start_kernel+0x5e/0x4c2 [ 0.000000] ? load_ucode_bsp+0x113/0x12f [ 0.000000] ? secondary_startup_64+0xa5/0xb0
This patch adds checks to prevent the panic.
Cc: stable@vger.kernel.org Signed-off-by: He Zhe <zhe.he@windriver.com> --- v2: - Split out printk cleanups - Add cc to stable@vger.kernel.org - Use more meaningful error message
arch/x86/kernel/check.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/arch/x86/kernel/check.c b/arch/x86/kernel/check.c index 3339942..cc8258a 100644 --- a/arch/x86/kernel/check.c +++ b/arch/x86/kernel/check.c @@ -31,6 +31,11 @@ static __init int set_corruption_check(char *arg) ssize_t ret; unsigned long val; + if (!arg) { + pr_err("memory_corruption_check config string not provided\n"); + return -EINVAL; + } + ret = kstrtoul(arg, 10, &val); if (ret) return ret; @@ -45,6 +50,11 @@ static __init int set_corruption_check_period(char *arg) ssize_t ret; unsigned long val; + if (!arg) { + pr_err("memory_corruption_check_period config string not provided\n"); + return -EINVAL; + } + ret = kstrtoul(arg, 10, &val); if (ret) return ret; @@ -59,6 +69,11 @@ static __init int set_corruption_check_size(char *arg) char *end; unsigned size; + if (!arg) { + pr_err("memory_corruption_check_size config string not provided\n"); + return -EINVAL; + } + size = memparse(arg, &end); if (*end == '\0') -- 2.7.4
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