| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.4 41/44] powerpc/pseries/lparcfg: Fix possible overflow are more than 1026 | Date | Mon, 7 Jul 2014 17:07:31 -0700 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Chen Gang <gang.chen@asianux.com>
commit 5676005acf26ab7e924a8438ea4746e47d405762 upstream.
need set '\0' for 'local_buffer'.
SPLPAR_MAXLENGTH is 1026, RTAS_DATA_BUF_SIZE is 4096. so the contents of rtas_data_buf may truncated in memcpy.
if contents are really truncated. the splpar_strlen is more than 1026. the next while loop checking will not find the end of buffer. that will cause memory access violation.
Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Cc: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/powerpc/kernel/lparcfg.c | 1 + 1 file changed, 1 insertion(+)
--- a/arch/powerpc/kernel/lparcfg.c +++ b/arch/powerpc/kernel/lparcfg.c @@ -307,6 +307,7 @@ static void parse_system_parameter_strin __pa(rtas_data_buf), RTAS_DATA_BUF_SIZE); memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH); + local_buffer[SPLPAR_MAXLENGTH - 1] = '\0'; spin_unlock(&rtas_data_buf_lock); if (call_status != 0) {
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