| Message ID | 20240321145609.8159-1-bethany.jamison@canonical.com |
|---|---|
| Headers | show |
| Series | CVE-2020-36776 | expand |
On 3/21/24 8:56 AM, Bethany Jamison wrote: > [Impact] > > In the Linux kernel, the following vulnerability has been resolved: > > thermal/drivers/cpufreq_cooling: Fix slab OOB issue > > Slab OOB issue is scanned by KASAN in cpu_power_to_freq(). > If power is limited below the power of OPP0 in EM table, > it will cause slab out-of-bound issue with negative array > index. > > Return the lowest frequency if limited power cannot found > a suitable OPP in EM table to fix this issue. > > Backtrace: > [<ffffffd02d2a37f0>] die+0x104/0x5ac > [<ffffffd02d2a5630>] bug_handler+0x64/0xd0 > [<ffffffd02d288ce4>] brk_handler+0x160/0x258 > [<ffffffd02d281e5c>] do_debug_exception+0x248/0x3f0 > [<ffffffd02d284488>] el1_dbg+0x14/0xbc > [<ffffffd02d75d1d4>] __kasan_report+0x1dc/0x1e0 > [<ffffffd02d75c2e0>] kasan_report+0x10/0x20 > [<ffffffd02d75def8>] __asan_report_load8_noabort+0x18/0x28 > [<ffffffd02e6fce5c>] cpufreq_power2state+0x180/0x43c > [<ffffffd02e6ead80>] power_actor_set_power+0x114/0x1d4 > [<ffffffd02e6fac24>] allocate_power+0xaec/0xde0 > [<ffffffd02e6f9f80>] power_allocator_throttle+0x3ec/0x5a4 > [<ffffffd02e6ea888>] handle_thermal_trip+0x160/0x294 > [<ffffffd02e6edd08>] thermal_zone_device_check+0xe4/0x154 > [<ffffffd02d351cb4>] process_one_work+0x5e4/0xe28 > [<ffffffd02d352f44>] worker_thread+0xa4c/0xfac > [<ffffffd02d360124>] kthread+0x33c/0x358 > [<ffffffd02d289940>] ret_from_fork+0xc/0x18 > > [Fix] > > Mantic: not-affected > Jammy: not-affected > Focal: Backported - The fix commit changes the range of a for-loop, > but Focal's for-loop was set up differently than upstream (decrementing > instead of incrementing) so I modified the range of the for-loop to > match the fix commit (0, max_level]. > Bionic: Backported - being sent out via esm ML. > Xenial: not-affected > Trusty: not-affected > > [Test Case] > > Compile and boot tested. > > [Where problems could occur] > > This affectes those using the cpufreq_cooling thermal driver, issues could > occur in memory management if this out-of-bounds issue causes power to be > too low in the CPU. > > brian-sy yang (1): > thermal/drivers/cpufreq_cooling: Fix slab OOB issue > > drivers/thermal/cpu_cooling.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Acked-by: Tim Gardner <tim.gardner@canonical.com>
On Thu, Mar 21, 2024 at 09:56:08AM -0500, Bethany Jamison wrote: > [Impact] > > In the Linux kernel, the following vulnerability has been resolved: > > thermal/drivers/cpufreq_cooling: Fix slab OOB issue > > Slab OOB issue is scanned by KASAN in cpu_power_to_freq(). > If power is limited below the power of OPP0 in EM table, > it will cause slab out-of-bound issue with negative array > index. > > Return the lowest frequency if limited power cannot found > a suitable OPP in EM table to fix this issue. > > Backtrace: > [<ffffffd02d2a37f0>] die+0x104/0x5ac > [<ffffffd02d2a5630>] bug_handler+0x64/0xd0 > [<ffffffd02d288ce4>] brk_handler+0x160/0x258 > [<ffffffd02d281e5c>] do_debug_exception+0x248/0x3f0 > [<ffffffd02d284488>] el1_dbg+0x14/0xbc > [<ffffffd02d75d1d4>] __kasan_report+0x1dc/0x1e0 > [<ffffffd02d75c2e0>] kasan_report+0x10/0x20 > [<ffffffd02d75def8>] __asan_report_load8_noabort+0x18/0x28 > [<ffffffd02e6fce5c>] cpufreq_power2state+0x180/0x43c > [<ffffffd02e6ead80>] power_actor_set_power+0x114/0x1d4 > [<ffffffd02e6fac24>] allocate_power+0xaec/0xde0 > [<ffffffd02e6f9f80>] power_allocator_throttle+0x3ec/0x5a4 > [<ffffffd02e6ea888>] handle_thermal_trip+0x160/0x294 > [<ffffffd02e6edd08>] thermal_zone_device_check+0xe4/0x154 > [<ffffffd02d351cb4>] process_one_work+0x5e4/0xe28 > [<ffffffd02d352f44>] worker_thread+0xa4c/0xfac > [<ffffffd02d360124>] kthread+0x33c/0x358 > [<ffffffd02d289940>] ret_from_fork+0xc/0x18 > > [Fix] > > Mantic: not-affected > Jammy: not-affected > Focal: Backported - The fix commit changes the range of a for-loop, > but Focal's for-loop was set up differently than upstream (decrementing > instead of incrementing) so I modified the range of the for-loop to > match the fix commit (0, max_level]. > Bionic: Backported - being sent out via esm ML. > Xenial: not-affected > Trusty: not-affected > > [Test Case] > > Compile and boot tested. > > [Where problems could occur] > > This affectes those using the cpufreq_cooling thermal driver, issues could > occur in memory management if this out-of-bounds issue causes power to be > too low in the CPU. > > brian-sy yang (1): > thermal/drivers/cpufreq_cooling: Fix slab OOB issue > > drivers/thermal/cpu_cooling.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Acked-by: Portia Stephens <portia.stephens@canonical.com>
On 21/03/2024 15:56, Bethany Jamison wrote: > [Impact] > > In the Linux kernel, the following vulnerability has been resolved: > > thermal/drivers/cpufreq_cooling: Fix slab OOB issue > > Slab OOB issue is scanned by KASAN in cpu_power_to_freq(). > If power is limited below the power of OPP0 in EM table, > it will cause slab out-of-bound issue with negative array > index. > > Return the lowest frequency if limited power cannot found > a suitable OPP in EM table to fix this issue. > > Backtrace: > [<ffffffd02d2a37f0>] die+0x104/0x5ac > [<ffffffd02d2a5630>] bug_handler+0x64/0xd0 > [<ffffffd02d288ce4>] brk_handler+0x160/0x258 > [<ffffffd02d281e5c>] do_debug_exception+0x248/0x3f0 > [<ffffffd02d284488>] el1_dbg+0x14/0xbc > [<ffffffd02d75d1d4>] __kasan_report+0x1dc/0x1e0 > [<ffffffd02d75c2e0>] kasan_report+0x10/0x20 > [<ffffffd02d75def8>] __asan_report_load8_noabort+0x18/0x28 > [<ffffffd02e6fce5c>] cpufreq_power2state+0x180/0x43c > [<ffffffd02e6ead80>] power_actor_set_power+0x114/0x1d4 > [<ffffffd02e6fac24>] allocate_power+0xaec/0xde0 > [<ffffffd02e6f9f80>] power_allocator_throttle+0x3ec/0x5a4 > [<ffffffd02e6ea888>] handle_thermal_trip+0x160/0x294 > [<ffffffd02e6edd08>] thermal_zone_device_check+0xe4/0x154 > [<ffffffd02d351cb4>] process_one_work+0x5e4/0xe28 > [<ffffffd02d352f44>] worker_thread+0xa4c/0xfac > [<ffffffd02d360124>] kthread+0x33c/0x358 > [<ffffffd02d289940>] ret_from_fork+0xc/0x18 > > [Fix] > > Mantic: not-affected > Jammy: not-affected > Focal: Backported - The fix commit changes the range of a for-loop, > but Focal's for-loop was set up differently than upstream (decrementing > instead of incrementing) so I modified the range of the for-loop to > match the fix commit (0, max_level]. > Bionic: Backported - being sent out via esm ML. > Xenial: not-affected > Trusty: not-affected > > [Test Case] > > Compile and boot tested. > > [Where problems could occur] > > This affectes those using the cpufreq_cooling thermal driver, issues could > occur in memory management if this out-of-bounds issue causes power to be > too low in the CPU. > > brian-sy yang (1): > thermal/drivers/cpufreq_cooling: Fix slab OOB issue > > drivers/thermal/cpu_cooling.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Applied to focal master-next branch. Thanks!