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authorAndrey Ryabinin <aryabinin@virtuozzo.com>2017-01-26 17:27:23 +0300
committerAndy Shevchenko <andriy.shevchenko@linux.intel.com>2017-02-14 00:39:48 +0200
commit4f24ecff0153047a4a8b53c31d8001ee79e1cab7 (patch)
tree461df28bb2597ef59f794c1b2374ecd481a9b74e /drivers/platform
parentbe2eba5810db19a3f752430cd1b03e9457c2959c (diff)
downloadlinux-4f24ecff0153047a4a8b53c31d8001ee79e1cab7.tar.bz2
platform/x86: intel_pmc_core: fix out-of-bounds accesses on stack
pmc_core_mtpmc_link_status() an pmc_core_check_read_lock_bit() use test_bit() on local 32-bit variable. This causes out-of-bounds access since test_bit() expects object at least of 'unsigned long' size: BUG: KASAN: stack-out-of-bounds in pmc_core_probe+0x3aa/0x3b0 Call Trace: __asan_report_load_n_noabort+0x5c/0x80 pmc_core_probe+0x3aa/0x3b0 local_pci_probe+0xf9/0x1e0 pci_device_probe+0x27b/0x350 driver_probe_device+0x419/0x830 __driver_attach+0x15f/0x1d0 bus_for_each_dev+0x129/0x1d0 driver_attach+0x42/0x70 bus_add_driver+0x385/0x690 driver_register+0x1a9/0x3d0 __pci_register_driver+0x1a2/0x290 intel_pmc_core_driver_init+0x19/0x1b do_one_initcall+0x12e/0x280 kernel_init_freeable+0x57c/0x623 kernel_init+0x13/0x140 ret_from_fork+0x2e/0x40 Fix this by open coding bit test. While at it, also refactor this code a little bit. Fixes: 173943b3dae5 ("platform/x86: intel_pmc_core: ModPhy core lanes pg status") Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> [andy: reverted not related changes, used BIT() macro] Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/intel_pmc_core.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index b130b8c9b9d7..914bcd2edbde 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -188,8 +188,7 @@ static int pmc_core_check_read_lock_bit(void)
u32 value;
value = pmc_core_reg_read(pmcdev, SPT_PMC_PM_CFG_OFFSET);
- return test_bit(SPT_PMC_READ_DISABLE_BIT,
- (unsigned long *)&value);
+ return value & BIT(SPT_PMC_READ_DISABLE_BIT);
}
#if IS_ENABLED(CONFIG_DEBUG_FS)
@@ -238,8 +237,7 @@ static int pmc_core_mtpmc_link_status(void)
u32 value;
value = pmc_core_reg_read(pmcdev, SPT_PMC_PM_STS_OFFSET);
- return test_bit(SPT_PMC_MSG_FULL_STS_BIT,
- (unsigned long *)&value);
+ return value & BIT(SPT_PMC_MSG_FULL_STS_BIT);
}
static int pmc_core_send_msg(u32 *addr_xram)