| Message ID | 20221208195046.1980312-1-amadeuszx.slawinski@linux.intel.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | ACPICA: Fix operand resolution | expand |
On Thu, Dec 8, 2022 at 12:51 PM Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com> wrote: > > In our tests we get UBSAN warning coming from ACPI parser. This is > caused by trying to resolve operands when there is none. > > [ 0.000000] Linux version 5.15.0-rc3chromeavsrel1.0.184+ (root@...) (gcc (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #1 SMP PREEMPT Sat Oct 16 00:08:27 UTC 2021 > ... > [ 14.719508] ================================================================================ > [ 14.719551] UBSAN: array-index-out-of-bounds in /.../linux/drivers/acpi/acpica/dswexec.c:401:12 > [ 14.719594] index -1 is out of range for type 'acpi_operand_object *[9]' > [ 14.719621] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc3chromeavsrel1.0.184+ #1 > [ 14.719657] Hardware name: Intel Corp. Geminilake/GLK RVP2 LP4SD (07), BIOS GELKRVPA.X64.0214.B50.2009111159 09/11/2020 > [ 14.719694] Call Trace: > [ 14.719712] dump_stack_lvl+0x38/0x49 > [ 14.719749] dump_stack+0x10/0x12 > [ 14.719775] ubsan_epilogue+0x9/0x45 > [ 14.719801] __ubsan_handle_out_of_bounds.cold+0x44/0x49 > [ 14.719835] acpi_ds_exec_end_op+0x1d7/0x6b5 > [ 14.719870] acpi_ps_parse_loop+0x942/0xb34 > ... > > Problem happens because WalkState->NumOperands is 0 and it is used when > trying to access into operands table. Actual code is: > WalkState->Operands [WalkState->NumOperands -1] > which causes out of bound access. Improve the check before above access > to check if ACPI opcode should have any arguments (operands) at all. > > Link: https://github.com/acpica/acpica/pull/745 > Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com> > Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com> > --- > drivers/acpi/acpica/dswexec.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/acpi/acpica/dswexec.c b/drivers/acpi/acpica/dswexec.c > index e8ad41387f84..489c9b9d8d15 100644 > --- a/drivers/acpi/acpica/dswexec.c > +++ b/drivers/acpi/acpica/dswexec.c > @@ -389,9 +389,11 @@ acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state) > > /* > * All opcodes require operand resolution, with the only exceptions > - * being the object_type and size_of operators. > + * being the object_type and size_of operators as well as operands that Should this be "opcodes that take no arguments" rather? > + * take no arguments. > */ > - if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) { > + if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE) && > + (walk_state->op_info->flags & AML_HAS_ARGS)) { > > /* Resolve all operands */ > > --
On 12/8/2022 12:55 PM, Rafael J. Wysocki wrote: > On Thu, Dec 8, 2022 at 12:51 PM Amadeusz Sławiński > <amadeuszx.slawinski@linux.intel.com> wrote: >> >> In our tests we get UBSAN warning coming from ACPI parser. This is >> caused by trying to resolve operands when there is none. >> >> [ 0.000000] Linux version 5.15.0-rc3chromeavsrel1.0.184+ (root@...) (gcc (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #1 SMP PREEMPT Sat Oct 16 00:08:27 UTC 2021 >> ... >> [ 14.719508] ================================================================================ >> [ 14.719551] UBSAN: array-index-out-of-bounds in /.../linux/drivers/acpi/acpica/dswexec.c:401:12 >> [ 14.719594] index -1 is out of range for type 'acpi_operand_object *[9]' >> [ 14.719621] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc3chromeavsrel1.0.184+ #1 >> [ 14.719657] Hardware name: Intel Corp. Geminilake/GLK RVP2 LP4SD (07), BIOS GELKRVPA.X64.0214.B50.2009111159 09/11/2020 >> [ 14.719694] Call Trace: >> [ 14.719712] dump_stack_lvl+0x38/0x49 >> [ 14.719749] dump_stack+0x10/0x12 >> [ 14.719775] ubsan_epilogue+0x9/0x45 >> [ 14.719801] __ubsan_handle_out_of_bounds.cold+0x44/0x49 >> [ 14.719835] acpi_ds_exec_end_op+0x1d7/0x6b5 >> [ 14.719870] acpi_ps_parse_loop+0x942/0xb34 >> ... >> >> Problem happens because WalkState->NumOperands is 0 and it is used when >> trying to access into operands table. Actual code is: >> WalkState->Operands [WalkState->NumOperands -1] >> which causes out of bound access. Improve the check before above access >> to check if ACPI opcode should have any arguments (operands) at all. >> >> Link: https://github.com/acpica/acpica/pull/745 >> Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com> >> Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com> >> --- >> drivers/acpi/acpica/dswexec.c | 6 ++++-- >> 1 file changed, 4 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/acpi/acpica/dswexec.c b/drivers/acpi/acpica/dswexec.c >> index e8ad41387f84..489c9b9d8d15 100644 >> --- a/drivers/acpi/acpica/dswexec.c >> +++ b/drivers/acpi/acpica/dswexec.c >> @@ -389,9 +389,11 @@ acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state) >> >> /* >> * All opcodes require operand resolution, with the only exceptions >> - * being the object_type and size_of operators. >> + * being the object_type and size_of operators as well as operands that > > Should this be "opcodes that take no arguments" rather? > Yes, it makes more sense that way. I've send v2 and updated pull request to acpica. >> + * take no arguments. >> */ >> - if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) { >> + if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE) && >> + (walk_state->op_info->flags & AML_HAS_ARGS)) { >> >> /* Resolve all operands */ >> >> --
diff --git a/drivers/acpi/acpica/dswexec.c b/drivers/acpi/acpica/dswexec.c index e8ad41387f84..489c9b9d8d15 100644 --- a/drivers/acpi/acpica/dswexec.c +++ b/drivers/acpi/acpica/dswexec.c @@ -389,9 +389,11 @@ acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state) /* * All opcodes require operand resolution, with the only exceptions - * being the object_type and size_of operators. + * being the object_type and size_of operators as well as operands that + * take no arguments. */ - if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) { + if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE) && + (walk_state->op_info->flags & AML_HAS_ARGS)) { /* Resolve all operands */