May 2025 - Linux-stable-mirror

[PATCH 1/3] ASoC: amd: acp6x-pdm-dma: free pdm device data on closing

by Fedor Pchelkin

Dynamic memory referenced by runtime->private_data pointer is allocated in acp6x_pdm_dma_open() and needs to be freed in the corresponding ->close() callback. unreferenced object 0xffff88813525a940 (size 32): comm "pipewire", pid 1238, jiffies 4294728195 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 3c 03 00 c9 ff ff ..........<..... backtrace (crc 14400236): __kmalloc_cache_noprof+0x3a3/0x490 acp6x_pdm_dma_open+0x10d/0x680 [snd_acp6x_pdm_dma] snd_soc_component_open+0x71/0x150 [snd_soc_core] __soc_pcm_open+0x221/0xb40 [snd_soc_core] soc_pcm_open+0x99/0x110 [snd_soc_core] snd_pcm_open_substream+0x18b/0x4e0 [snd_pcm] snd_pcm_open+0x244/0x670 [snd_pcm] snd_pcm_capture_open+0x72/0xd0 [snd_pcm] chrdev_open+0x1eb/0x5e0 do_dentry_open+0x494/0x1820 vfs_open+0x7a/0x440 do_open+0x3d0/0xd30 path_openat+0x1d3/0x580 do_filp_open+0x1c5/0x450 do_sys_openat2+0xef/0x180 __x64_sys_openat+0x10e/0x210 Found by Linux Verification Center (linuxtesting.org). Fixes: ceb4fcc13ae5 ("ASoC: amd: add acp6x pdm driver dma ops") Cc: stable(a)vger.kernel.org Signed-off-by: Fedor Pchelkin <pchelkin(a)ispras.ru> --- sound/soc/amd/yc/acp6x-pdm-dma.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/soc/amd/yc/acp6x-pdm-dma.c b/sound/soc/amd/yc/acp6x-pdm-dma.c index ac758b90f441..167cd792d33d 100644 --- a/sound/soc/amd/yc/acp6x-pdm-dma.c +++ b/sound/soc/amd/yc/acp6x-pdm-dma.c @@ -275,9 +275,11 @@ static int acp6x_pdm_dma_close(struct snd_soc_component *component, struct snd_pcm_substream *substream) { struct pdm_dev_data *adata = dev_get_drvdata(component->dev); + struct snd_pcm_runtime *runtime = substream->runtime; acp6x_disable_pdm_interrupts(adata->acp6x_base); adata->capture_stream = NULL; + kfree(runtime->private_data); return 0; } -- 2.49.0

1 month

1
0
0 0

[PATCH AUTOSEL 5.4 1/6] ACPICA: fix acpi operand cache leak in dswstate.c

by Sasha Levin

From: Seunghun Han <kkamagui(a)gmail.com> [ Upstream commit 156fd20a41e776bbf334bd5e45c4f78dfc90ce1c ] ACPICA commit 987a3b5cf7175916e2a4b6ea5b8e70f830dfe732 I found an ACPI cache leak in ACPI early termination and boot continuing case. When early termination occurs due to malicious ACPI table, Linux kernel terminates ACPI function and continues to boot process. While kernel terminates ACPI function, kmem_cache_destroy() reports Acpi-Operand cache leak. Boot log of ACPI operand cache leak is as follows: >[ 0.585957] ACPI: Added _OSI(Module Device) >[ 0.587218] ACPI: Added _OSI(Processor Device) >[ 0.588530] ACPI: Added _OSI(3.0 _SCP Extensions) >[ 0.589790] ACPI: Added _OSI(Processor Aggregator Device) >[ 0.591534] ACPI Error: Illegal I/O port address/length above 64K: C806E00000004002/0x2 (20170303/hwvalid-155) >[ 0.594351] ACPI Exception: AE_LIMIT, Unable to initialize fixed events (20170303/evevent-88) >[ 0.597858] ACPI: Unable to start the ACPI Interpreter >[ 0.599162] ACPI Error: Could not remove SCI handler (20170303/evmisc-281) >[ 0.601836] kmem_cache_destroy Acpi-Operand: Slab cache still has objects >[ 0.603556] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.12.0-rc5 #26 >[ 0.605159] Hardware name: innotek gmb_h virtual_box/virtual_box, BIOS virtual_box 12/01/2006 >[ 0.609177] Call Trace: >[ 0.610063] ? dump_stack+0x5c/0x81 >[ 0.611118] ? kmem_cache_destroy+0x1aa/0x1c0 >[ 0.612632] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.613906] ? acpi_os_delete_cache+0xa/0x10 >[ 0.617986] ? acpi_ut_delete_caches+0x3f/0x7b >[ 0.619293] ? acpi_terminate+0xa/0x14 >[ 0.620394] ? acpi_init+0x2af/0x34f >[ 0.621616] ? __class_create+0x4c/0x80 >[ 0.623412] ? video_setup+0x7f/0x7f >[ 0.624585] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.625861] ? do_one_initcall+0x4e/0x1a0 >[ 0.627513] ? kernel_init_freeable+0x19e/0x21f >[ 0.628972] ? rest_init+0x80/0x80 >[ 0.630043] ? kernel_init+0xa/0x100 >[ 0.631084] ? ret_from_fork+0x25/0x30 >[ 0.633343] vgaarb: loaded >[ 0.635036] EDAC MC: Ver: 3.0.0 >[ 0.638601] PCI: Probing PCI hardware >[ 0.639833] PCI host bridge to bus 0000:00 >[ 0.641031] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] > ... Continue to boot and log is omitted ... I analyzed this memory leak in detail and found acpi_ds_obj_stack_pop_and_ delete() function miscalculated the top of the stack. acpi_ds_obj_stack_push() function uses walk_state->operand_index for start position of the top, but acpi_ds_obj_stack_pop_and_delete() function considers index 0 for it. Therefore, this causes acpi operand memory leak. This cache leak causes a security threat because an old kernel (<= 4.9) shows memory locations of kernel functions in stack dump. Some malicious users could use this information to neutralize kernel ASLR. I made a patch to fix ACPI operand cache leak. Link: https://github.com/acpica/acpica/commit/987a3b5c Signed-off-by: Seunghun Han <kkamagui(a)gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Link: https://patch.msgid.link/4999480.31r3eYUQgx@rjwysocki.net Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- **YES** This commit should be backported to stable kernel trees based on the following analysis: ## Analysis of the Commit **1. Bug Fix Nature**: This commit fixes a clear memory leak bug in the ACPICA subsystem. The issue occurs when `acpi_ds_create_operands()` encounters an error during operand creation and needs to clean up allocated operands. **2. Root Cause**: The core issue is a mismatch between how operands are pushed and popped from the stack: - `acpi_ds_obj_stack_push()` uses `walk_state->operand_index` to track the current position - `acpi_ds_obj_stack_pop_and_delete()` incorrectly assumes operands start at index 0 - This causes incomplete cleanup when errors occur, leading to memory leaks **3. Code Analysis**: The fix correctly addresses the issue by: - Tracking the original operand count (`prev_num_operands`) - Calculating the correct number of operands to clean up (`new_num_operands`) - Setting `walk_state->num_operands = i` before cleanup to ensure proper indexing - Restoring the original operand count after cleanup **4. Security Implications**: The commit message explicitly mentions this is a security issue - the memory leak can expose kernel function addresses in older kernels (≤4.9), potentially defeating ASLR. This elevates the importance beyond a simple memory leak. **5. Pattern Consistency**: This follows the exact same pattern as other ACPICA operand cache leak fixes that were successfully backported (commits `97f3c0a4b057`, `2915f16bdce2`, etc.), all authored by the same developer addressing similar issues. **6. Stability Characteristics**: - **Small and contained**: Only 8 lines of actual logic changes - **Clear error path**: Only affects cleanup during error conditions - **No behavioral changes**: No impact on normal operation - **Low regression risk**: Only modifies error handling paths **7. Backport Suitability Criteria**: - ✅ Fixes important bug affecting users (memory leak) - ✅ Small, contained fix with minimal risk - ✅ No architectural changes - ✅ Addresses security concern (ASLR bypass potential) - ✅ Follows established patterns for ACPICA fixes - ✅ Critical kernel subsystem (ACPI) **8. Historical Precedent**: The similar commits in the reference examples (Similar Commits #1, #2, #3) all have "Backport Status: YES" and address nearly identical ACPICA operand cache leak issues with similar fixes and commit message patterns. This commit meets all criteria for stable tree backporting: it's an important bugfix, has minimal regression risk, affects a critical subsystem, and follows established patterns for similar fixes that were previously backported. drivers/acpi/acpica/dsutils.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/acpica/dsutils.c b/drivers/acpi/acpica/dsutils.c index fb9ed5e1da89d..2bdae8a25e084 100644 --- a/drivers/acpi/acpica/dsutils.c +++ b/drivers/acpi/acpica/dsutils.c @@ -668,6 +668,8 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS]; u32 arg_count = 0; u32 index = walk_state->num_operands; + u32 prev_num_operands = walk_state->num_operands; + u32 new_num_operands; u32 i; ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); @@ -696,6 +698,7 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, /* Create the interpreter arguments, in reverse order */ + new_num_operands = index; index--; for (i = 0; i < arg_count; i++) { arg = arguments[index]; @@ -720,7 +723,11 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, * pop everything off of the operand stack and delete those * objects */ - acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); + walk_state->num_operands = i; + acpi_ds_obj_stack_pop_and_delete(new_num_operands, walk_state); + + /* Restore operand count */ + walk_state->num_operands = prev_num_operands; ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index)); return_ACPI_STATUS(status); -- 2.39.5

1 month

1
5
0 0

[PATCH AUTOSEL 5.10 01/10] ACPICA: fix acpi operand cache leak in dswstate.c

by Sasha Levin

From: Seunghun Han <kkamagui(a)gmail.com> [ Upstream commit 156fd20a41e776bbf334bd5e45c4f78dfc90ce1c ] ACPICA commit 987a3b5cf7175916e2a4b6ea5b8e70f830dfe732 I found an ACPI cache leak in ACPI early termination and boot continuing case. When early termination occurs due to malicious ACPI table, Linux kernel terminates ACPI function and continues to boot process. While kernel terminates ACPI function, kmem_cache_destroy() reports Acpi-Operand cache leak. Boot log of ACPI operand cache leak is as follows: >[ 0.585957] ACPI: Added _OSI(Module Device) >[ 0.587218] ACPI: Added _OSI(Processor Device) >[ 0.588530] ACPI: Added _OSI(3.0 _SCP Extensions) >[ 0.589790] ACPI: Added _OSI(Processor Aggregator Device) >[ 0.591534] ACPI Error: Illegal I/O port address/length above 64K: C806E00000004002/0x2 (20170303/hwvalid-155) >[ 0.594351] ACPI Exception: AE_LIMIT, Unable to initialize fixed events (20170303/evevent-88) >[ 0.597858] ACPI: Unable to start the ACPI Interpreter >[ 0.599162] ACPI Error: Could not remove SCI handler (20170303/evmisc-281) >[ 0.601836] kmem_cache_destroy Acpi-Operand: Slab cache still has objects >[ 0.603556] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.12.0-rc5 #26 >[ 0.605159] Hardware name: innotek gmb_h virtual_box/virtual_box, BIOS virtual_box 12/01/2006 >[ 0.609177] Call Trace: >[ 0.610063] ? dump_stack+0x5c/0x81 >[ 0.611118] ? kmem_cache_destroy+0x1aa/0x1c0 >[ 0.612632] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.613906] ? acpi_os_delete_cache+0xa/0x10 >[ 0.617986] ? acpi_ut_delete_caches+0x3f/0x7b >[ 0.619293] ? acpi_terminate+0xa/0x14 >[ 0.620394] ? acpi_init+0x2af/0x34f >[ 0.621616] ? __class_create+0x4c/0x80 >[ 0.623412] ? video_setup+0x7f/0x7f >[ 0.624585] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.625861] ? do_one_initcall+0x4e/0x1a0 >[ 0.627513] ? kernel_init_freeable+0x19e/0x21f >[ 0.628972] ? rest_init+0x80/0x80 >[ 0.630043] ? kernel_init+0xa/0x100 >[ 0.631084] ? ret_from_fork+0x25/0x30 >[ 0.633343] vgaarb: loaded >[ 0.635036] EDAC MC: Ver: 3.0.0 >[ 0.638601] PCI: Probing PCI hardware >[ 0.639833] PCI host bridge to bus 0000:00 >[ 0.641031] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] > ... Continue to boot and log is omitted ... I analyzed this memory leak in detail and found acpi_ds_obj_stack_pop_and_ delete() function miscalculated the top of the stack. acpi_ds_obj_stack_push() function uses walk_state->operand_index for start position of the top, but acpi_ds_obj_stack_pop_and_delete() function considers index 0 for it. Therefore, this causes acpi operand memory leak. This cache leak causes a security threat because an old kernel (<= 4.9) shows memory locations of kernel functions in stack dump. Some malicious users could use this information to neutralize kernel ASLR. I made a patch to fix ACPI operand cache leak. Link: https://github.com/acpica/acpica/commit/987a3b5c Signed-off-by: Seunghun Han <kkamagui(a)gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Link: https://patch.msgid.link/4999480.31r3eYUQgx@rjwysocki.net Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- **YES** This commit should be backported to stable kernel trees based on the following analysis: ## Analysis of the Commit **1. Bug Fix Nature**: This commit fixes a clear memory leak bug in the ACPICA subsystem. The issue occurs when `acpi_ds_create_operands()` encounters an error during operand creation and needs to clean up allocated operands. **2. Root Cause**: The core issue is a mismatch between how operands are pushed and popped from the stack: - `acpi_ds_obj_stack_push()` uses `walk_state->operand_index` to track the current position - `acpi_ds_obj_stack_pop_and_delete()` incorrectly assumes operands start at index 0 - This causes incomplete cleanup when errors occur, leading to memory leaks **3. Code Analysis**: The fix correctly addresses the issue by: - Tracking the original operand count (`prev_num_operands`) - Calculating the correct number of operands to clean up (`new_num_operands`) - Setting `walk_state->num_operands = i` before cleanup to ensure proper indexing - Restoring the original operand count after cleanup **4. Security Implications**: The commit message explicitly mentions this is a security issue - the memory leak can expose kernel function addresses in older kernels (≤4.9), potentially defeating ASLR. This elevates the importance beyond a simple memory leak. **5. Pattern Consistency**: This follows the exact same pattern as other ACPICA operand cache leak fixes that were successfully backported (commits `97f3c0a4b057`, `2915f16bdce2`, etc.), all authored by the same developer addressing similar issues. **6. Stability Characteristics**: - **Small and contained**: Only 8 lines of actual logic changes - **Clear error path**: Only affects cleanup during error conditions - **No behavioral changes**: No impact on normal operation - **Low regression risk**: Only modifies error handling paths **7. Backport Suitability Criteria**: - ✅ Fixes important bug affecting users (memory leak) - ✅ Small, contained fix with minimal risk - ✅ No architectural changes - ✅ Addresses security concern (ASLR bypass potential) - ✅ Follows established patterns for ACPICA fixes - ✅ Critical kernel subsystem (ACPI) **8. Historical Precedent**: The similar commits in the reference examples (Similar Commits #1, #2, #3) all have "Backport Status: YES" and address nearly identical ACPICA operand cache leak issues with similar fixes and commit message patterns. This commit meets all criteria for stable tree backporting: it's an important bugfix, has minimal regression risk, affects a critical subsystem, and follows established patterns for similar fixes that were previously backported. drivers/acpi/acpica/dsutils.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/acpica/dsutils.c b/drivers/acpi/acpica/dsutils.c index fb9ed5e1da89d..2bdae8a25e084 100644 --- a/drivers/acpi/acpica/dsutils.c +++ b/drivers/acpi/acpica/dsutils.c @@ -668,6 +668,8 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS]; u32 arg_count = 0; u32 index = walk_state->num_operands; + u32 prev_num_operands = walk_state->num_operands; + u32 new_num_operands; u32 i; ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); @@ -696,6 +698,7 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, /* Create the interpreter arguments, in reverse order */ + new_num_operands = index; index--; for (i = 0; i < arg_count; i++) { arg = arguments[index]; @@ -720,7 +723,11 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, * pop everything off of the operand stack and delete those * objects */ - acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); + walk_state->num_operands = i; + acpi_ds_obj_stack_pop_and_delete(new_num_operands, walk_state); + + /* Restore operand count */ + walk_state->num_operands = prev_num_operands; ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index)); return_ACPI_STATUS(status); -- 2.39.5

1 month

1
9
0 0

[PATCH AUTOSEL 5.15 01/11] ACPICA: fix acpi operand cache leak in dswstate.c

by Sasha Levin

From: Seunghun Han <kkamagui(a)gmail.com> [ Upstream commit 156fd20a41e776bbf334bd5e45c4f78dfc90ce1c ] ACPICA commit 987a3b5cf7175916e2a4b6ea5b8e70f830dfe732 I found an ACPI cache leak in ACPI early termination and boot continuing case. When early termination occurs due to malicious ACPI table, Linux kernel terminates ACPI function and continues to boot process. While kernel terminates ACPI function, kmem_cache_destroy() reports Acpi-Operand cache leak. Boot log of ACPI operand cache leak is as follows: >[ 0.585957] ACPI: Added _OSI(Module Device) >[ 0.587218] ACPI: Added _OSI(Processor Device) >[ 0.588530] ACPI: Added _OSI(3.0 _SCP Extensions) >[ 0.589790] ACPI: Added _OSI(Processor Aggregator Device) >[ 0.591534] ACPI Error: Illegal I/O port address/length above 64K: C806E00000004002/0x2 (20170303/hwvalid-155) >[ 0.594351] ACPI Exception: AE_LIMIT, Unable to initialize fixed events (20170303/evevent-88) >[ 0.597858] ACPI: Unable to start the ACPI Interpreter >[ 0.599162] ACPI Error: Could not remove SCI handler (20170303/evmisc-281) >[ 0.601836] kmem_cache_destroy Acpi-Operand: Slab cache still has objects >[ 0.603556] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.12.0-rc5 #26 >[ 0.605159] Hardware name: innotek gmb_h virtual_box/virtual_box, BIOS virtual_box 12/01/2006 >[ 0.609177] Call Trace: >[ 0.610063] ? dump_stack+0x5c/0x81 >[ 0.611118] ? kmem_cache_destroy+0x1aa/0x1c0 >[ 0.612632] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.613906] ? acpi_os_delete_cache+0xa/0x10 >[ 0.617986] ? acpi_ut_delete_caches+0x3f/0x7b >[ 0.619293] ? acpi_terminate+0xa/0x14 >[ 0.620394] ? acpi_init+0x2af/0x34f >[ 0.621616] ? __class_create+0x4c/0x80 >[ 0.623412] ? video_setup+0x7f/0x7f >[ 0.624585] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.625861] ? do_one_initcall+0x4e/0x1a0 >[ 0.627513] ? kernel_init_freeable+0x19e/0x21f >[ 0.628972] ? rest_init+0x80/0x80 >[ 0.630043] ? kernel_init+0xa/0x100 >[ 0.631084] ? ret_from_fork+0x25/0x30 >[ 0.633343] vgaarb: loaded >[ 0.635036] EDAC MC: Ver: 3.0.0 >[ 0.638601] PCI: Probing PCI hardware >[ 0.639833] PCI host bridge to bus 0000:00 >[ 0.641031] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] > ... Continue to boot and log is omitted ... I analyzed this memory leak in detail and found acpi_ds_obj_stack_pop_and_ delete() function miscalculated the top of the stack. acpi_ds_obj_stack_push() function uses walk_state->operand_index for start position of the top, but acpi_ds_obj_stack_pop_and_delete() function considers index 0 for it. Therefore, this causes acpi operand memory leak. This cache leak causes a security threat because an old kernel (<= 4.9) shows memory locations of kernel functions in stack dump. Some malicious users could use this information to neutralize kernel ASLR. I made a patch to fix ACPI operand cache leak. Link: https://github.com/acpica/acpica/commit/987a3b5c Signed-off-by: Seunghun Han <kkamagui(a)gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Link: https://patch.msgid.link/4999480.31r3eYUQgx@rjwysocki.net Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- **YES** This commit should be backported to stable kernel trees based on the following analysis: ## Analysis of the Commit **1. Bug Fix Nature**: This commit fixes a clear memory leak bug in the ACPICA subsystem. The issue occurs when `acpi_ds_create_operands()` encounters an error during operand creation and needs to clean up allocated operands. **2. Root Cause**: The core issue is a mismatch between how operands are pushed and popped from the stack: - `acpi_ds_obj_stack_push()` uses `walk_state->operand_index` to track the current position - `acpi_ds_obj_stack_pop_and_delete()` incorrectly assumes operands start at index 0 - This causes incomplete cleanup when errors occur, leading to memory leaks **3. Code Analysis**: The fix correctly addresses the issue by: - Tracking the original operand count (`prev_num_operands`) - Calculating the correct number of operands to clean up (`new_num_operands`) - Setting `walk_state->num_operands = i` before cleanup to ensure proper indexing - Restoring the original operand count after cleanup **4. Security Implications**: The commit message explicitly mentions this is a security issue - the memory leak can expose kernel function addresses in older kernels (≤4.9), potentially defeating ASLR. This elevates the importance beyond a simple memory leak. **5. Pattern Consistency**: This follows the exact same pattern as other ACPICA operand cache leak fixes that were successfully backported (commits `97f3c0a4b057`, `2915f16bdce2`, etc.), all authored by the same developer addressing similar issues. **6. Stability Characteristics**: - **Small and contained**: Only 8 lines of actual logic changes - **Clear error path**: Only affects cleanup during error conditions - **No behavioral changes**: No impact on normal operation - **Low regression risk**: Only modifies error handling paths **7. Backport Suitability Criteria**: - ✅ Fixes important bug affecting users (memory leak) - ✅ Small, contained fix with minimal risk - ✅ No architectural changes - ✅ Addresses security concern (ASLR bypass potential) - ✅ Follows established patterns for ACPICA fixes - ✅ Critical kernel subsystem (ACPI) **8. Historical Precedent**: The similar commits in the reference examples (Similar Commits #1, #2, #3) all have "Backport Status: YES" and address nearly identical ACPICA operand cache leak issues with similar fixes and commit message patterns. This commit meets all criteria for stable tree backporting: it's an important bugfix, has minimal regression risk, affects a critical subsystem, and follows established patterns for similar fixes that were previously backported. drivers/acpi/acpica/dsutils.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/acpica/dsutils.c b/drivers/acpi/acpica/dsutils.c index fb9ed5e1da89d..2bdae8a25e084 100644 --- a/drivers/acpi/acpica/dsutils.c +++ b/drivers/acpi/acpica/dsutils.c @@ -668,6 +668,8 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS]; u32 arg_count = 0; u32 index = walk_state->num_operands; + u32 prev_num_operands = walk_state->num_operands; + u32 new_num_operands; u32 i; ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); @@ -696,6 +698,7 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, /* Create the interpreter arguments, in reverse order */ + new_num_operands = index; index--; for (i = 0; i < arg_count; i++) { arg = arguments[index]; @@ -720,7 +723,11 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, * pop everything off of the operand stack and delete those * objects */ - acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); + walk_state->num_operands = i; + acpi_ds_obj_stack_pop_and_delete(new_num_operands, walk_state); + + /* Restore operand count */ + walk_state->num_operands = prev_num_operands; ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index)); return_ACPI_STATUS(status); -- 2.39.5

1 month

1
10
0 0

[PATCH AUTOSEL 6.1 01/13] ACPICA: fix acpi operand cache leak in dswstate.c

by Sasha Levin

From: Seunghun Han <kkamagui(a)gmail.com> [ Upstream commit 156fd20a41e776bbf334bd5e45c4f78dfc90ce1c ] ACPICA commit 987a3b5cf7175916e2a4b6ea5b8e70f830dfe732 I found an ACPI cache leak in ACPI early termination and boot continuing case. When early termination occurs due to malicious ACPI table, Linux kernel terminates ACPI function and continues to boot process. While kernel terminates ACPI function, kmem_cache_destroy() reports Acpi-Operand cache leak. Boot log of ACPI operand cache leak is as follows: >[ 0.585957] ACPI: Added _OSI(Module Device) >[ 0.587218] ACPI: Added _OSI(Processor Device) >[ 0.588530] ACPI: Added _OSI(3.0 _SCP Extensions) >[ 0.589790] ACPI: Added _OSI(Processor Aggregator Device) >[ 0.591534] ACPI Error: Illegal I/O port address/length above 64K: C806E00000004002/0x2 (20170303/hwvalid-155) >[ 0.594351] ACPI Exception: AE_LIMIT, Unable to initialize fixed events (20170303/evevent-88) >[ 0.597858] ACPI: Unable to start the ACPI Interpreter >[ 0.599162] ACPI Error: Could not remove SCI handler (20170303/evmisc-281) >[ 0.601836] kmem_cache_destroy Acpi-Operand: Slab cache still has objects >[ 0.603556] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.12.0-rc5 #26 >[ 0.605159] Hardware name: innotek gmb_h virtual_box/virtual_box, BIOS virtual_box 12/01/2006 >[ 0.609177] Call Trace: >[ 0.610063] ? dump_stack+0x5c/0x81 >[ 0.611118] ? kmem_cache_destroy+0x1aa/0x1c0 >[ 0.612632] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.613906] ? acpi_os_delete_cache+0xa/0x10 >[ 0.617986] ? acpi_ut_delete_caches+0x3f/0x7b >[ 0.619293] ? acpi_terminate+0xa/0x14 >[ 0.620394] ? acpi_init+0x2af/0x34f >[ 0.621616] ? __class_create+0x4c/0x80 >[ 0.623412] ? video_setup+0x7f/0x7f >[ 0.624585] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.625861] ? do_one_initcall+0x4e/0x1a0 >[ 0.627513] ? kernel_init_freeable+0x19e/0x21f >[ 0.628972] ? rest_init+0x80/0x80 >[ 0.630043] ? kernel_init+0xa/0x100 >[ 0.631084] ? ret_from_fork+0x25/0x30 >[ 0.633343] vgaarb: loaded >[ 0.635036] EDAC MC: Ver: 3.0.0 >[ 0.638601] PCI: Probing PCI hardware >[ 0.639833] PCI host bridge to bus 0000:00 >[ 0.641031] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] > ... Continue to boot and log is omitted ... I analyzed this memory leak in detail and found acpi_ds_obj_stack_pop_and_ delete() function miscalculated the top of the stack. acpi_ds_obj_stack_push() function uses walk_state->operand_index for start position of the top, but acpi_ds_obj_stack_pop_and_delete() function considers index 0 for it. Therefore, this causes acpi operand memory leak. This cache leak causes a security threat because an old kernel (<= 4.9) shows memory locations of kernel functions in stack dump. Some malicious users could use this information to neutralize kernel ASLR. I made a patch to fix ACPI operand cache leak. Link: https://github.com/acpica/acpica/commit/987a3b5c Signed-off-by: Seunghun Han <kkamagui(a)gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Link: https://patch.msgid.link/4999480.31r3eYUQgx@rjwysocki.net Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- **YES** This commit should be backported to stable kernel trees based on the following analysis: ## Analysis of the Commit **1. Bug Fix Nature**: This commit fixes a clear memory leak bug in the ACPICA subsystem. The issue occurs when `acpi_ds_create_operands()` encounters an error during operand creation and needs to clean up allocated operands. **2. Root Cause**: The core issue is a mismatch between how operands are pushed and popped from the stack: - `acpi_ds_obj_stack_push()` uses `walk_state->operand_index` to track the current position - `acpi_ds_obj_stack_pop_and_delete()` incorrectly assumes operands start at index 0 - This causes incomplete cleanup when errors occur, leading to memory leaks **3. Code Analysis**: The fix correctly addresses the issue by: - Tracking the original operand count (`prev_num_operands`) - Calculating the correct number of operands to clean up (`new_num_operands`) - Setting `walk_state->num_operands = i` before cleanup to ensure proper indexing - Restoring the original operand count after cleanup **4. Security Implications**: The commit message explicitly mentions this is a security issue - the memory leak can expose kernel function addresses in older kernels (≤4.9), potentially defeating ASLR. This elevates the importance beyond a simple memory leak. **5. Pattern Consistency**: This follows the exact same pattern as other ACPICA operand cache leak fixes that were successfully backported (commits `97f3c0a4b057`, `2915f16bdce2`, etc.), all authored by the same developer addressing similar issues. **6. Stability Characteristics**: - **Small and contained**: Only 8 lines of actual logic changes - **Clear error path**: Only affects cleanup during error conditions - **No behavioral changes**: No impact on normal operation - **Low regression risk**: Only modifies error handling paths **7. Backport Suitability Criteria**: - ✅ Fixes important bug affecting users (memory leak) - ✅ Small, contained fix with minimal risk - ✅ No architectural changes - ✅ Addresses security concern (ASLR bypass potential) - ✅ Follows established patterns for ACPICA fixes - ✅ Critical kernel subsystem (ACPI) **8. Historical Precedent**: The similar commits in the reference examples (Similar Commits #1, #2, #3) all have "Backport Status: YES" and address nearly identical ACPICA operand cache leak issues with similar fixes and commit message patterns. This commit meets all criteria for stable tree backporting: it's an important bugfix, has minimal regression risk, affects a critical subsystem, and follows established patterns for similar fixes that were previously backported. drivers/acpi/acpica/dsutils.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/acpica/dsutils.c b/drivers/acpi/acpica/dsutils.c index fb9ed5e1da89d..2bdae8a25e084 100644 --- a/drivers/acpi/acpica/dsutils.c +++ b/drivers/acpi/acpica/dsutils.c @@ -668,6 +668,8 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS]; u32 arg_count = 0; u32 index = walk_state->num_operands; + u32 prev_num_operands = walk_state->num_operands; + u32 new_num_operands; u32 i; ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); @@ -696,6 +698,7 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, /* Create the interpreter arguments, in reverse order */ + new_num_operands = index; index--; for (i = 0; i < arg_count; i++) { arg = arguments[index]; @@ -720,7 +723,11 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, * pop everything off of the operand stack and delete those * objects */ - acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); + walk_state->num_operands = i; + acpi_ds_obj_stack_pop_and_delete(new_num_operands, walk_state); + + /* Restore operand count */ + walk_state->num_operands = prev_num_operands; ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index)); return_ACPI_STATUS(status); -- 2.39.5

1 month

1
12
0 0

[PATCH AUTOSEL 6.6 01/18] ACPICA: fix acpi operand cache leak in dswstate.c

by Sasha Levin

From: Seunghun Han <kkamagui(a)gmail.com> [ Upstream commit 156fd20a41e776bbf334bd5e45c4f78dfc90ce1c ] ACPICA commit 987a3b5cf7175916e2a4b6ea5b8e70f830dfe732 I found an ACPI cache leak in ACPI early termination and boot continuing case. When early termination occurs due to malicious ACPI table, Linux kernel terminates ACPI function and continues to boot process. While kernel terminates ACPI function, kmem_cache_destroy() reports Acpi-Operand cache leak. Boot log of ACPI operand cache leak is as follows: >[ 0.585957] ACPI: Added _OSI(Module Device) >[ 0.587218] ACPI: Added _OSI(Processor Device) >[ 0.588530] ACPI: Added _OSI(3.0 _SCP Extensions) >[ 0.589790] ACPI: Added _OSI(Processor Aggregator Device) >[ 0.591534] ACPI Error: Illegal I/O port address/length above 64K: C806E00000004002/0x2 (20170303/hwvalid-155) >[ 0.594351] ACPI Exception: AE_LIMIT, Unable to initialize fixed events (20170303/evevent-88) >[ 0.597858] ACPI: Unable to start the ACPI Interpreter >[ 0.599162] ACPI Error: Could not remove SCI handler (20170303/evmisc-281) >[ 0.601836] kmem_cache_destroy Acpi-Operand: Slab cache still has objects >[ 0.603556] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.12.0-rc5 #26 >[ 0.605159] Hardware name: innotek gmb_h virtual_box/virtual_box, BIOS virtual_box 12/01/2006 >[ 0.609177] Call Trace: >[ 0.610063] ? dump_stack+0x5c/0x81 >[ 0.611118] ? kmem_cache_destroy+0x1aa/0x1c0 >[ 0.612632] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.613906] ? acpi_os_delete_cache+0xa/0x10 >[ 0.617986] ? acpi_ut_delete_caches+0x3f/0x7b >[ 0.619293] ? acpi_terminate+0xa/0x14 >[ 0.620394] ? acpi_init+0x2af/0x34f >[ 0.621616] ? __class_create+0x4c/0x80 >[ 0.623412] ? video_setup+0x7f/0x7f >[ 0.624585] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.625861] ? do_one_initcall+0x4e/0x1a0 >[ 0.627513] ? kernel_init_freeable+0x19e/0x21f >[ 0.628972] ? rest_init+0x80/0x80 >[ 0.630043] ? kernel_init+0xa/0x100 >[ 0.631084] ? ret_from_fork+0x25/0x30 >[ 0.633343] vgaarb: loaded >[ 0.635036] EDAC MC: Ver: 3.0.0 >[ 0.638601] PCI: Probing PCI hardware >[ 0.639833] PCI host bridge to bus 0000:00 >[ 0.641031] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] > ... Continue to boot and log is omitted ... I analyzed this memory leak in detail and found acpi_ds_obj_stack_pop_and_ delete() function miscalculated the top of the stack. acpi_ds_obj_stack_push() function uses walk_state->operand_index for start position of the top, but acpi_ds_obj_stack_pop_and_delete() function considers index 0 for it. Therefore, this causes acpi operand memory leak. This cache leak causes a security threat because an old kernel (<= 4.9) shows memory locations of kernel functions in stack dump. Some malicious users could use this information to neutralize kernel ASLR. I made a patch to fix ACPI operand cache leak. Link: https://github.com/acpica/acpica/commit/987a3b5c Signed-off-by: Seunghun Han <kkamagui(a)gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Link: https://patch.msgid.link/4999480.31r3eYUQgx@rjwysocki.net Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- **YES** This commit should be backported to stable kernel trees based on the following analysis: ## Analysis of the Commit **1. Bug Fix Nature**: This commit fixes a clear memory leak bug in the ACPICA subsystem. The issue occurs when `acpi_ds_create_operands()` encounters an error during operand creation and needs to clean up allocated operands. **2. Root Cause**: The core issue is a mismatch between how operands are pushed and popped from the stack: - `acpi_ds_obj_stack_push()` uses `walk_state->operand_index` to track the current position - `acpi_ds_obj_stack_pop_and_delete()` incorrectly assumes operands start at index 0 - This causes incomplete cleanup when errors occur, leading to memory leaks **3. Code Analysis**: The fix correctly addresses the issue by: - Tracking the original operand count (`prev_num_operands`) - Calculating the correct number of operands to clean up (`new_num_operands`) - Setting `walk_state->num_operands = i` before cleanup to ensure proper indexing - Restoring the original operand count after cleanup **4. Security Implications**: The commit message explicitly mentions this is a security issue - the memory leak can expose kernel function addresses in older kernels (≤4.9), potentially defeating ASLR. This elevates the importance beyond a simple memory leak. **5. Pattern Consistency**: This follows the exact same pattern as other ACPICA operand cache leak fixes that were successfully backported (commits `97f3c0a4b057`, `2915f16bdce2`, etc.), all authored by the same developer addressing similar issues. **6. Stability Characteristics**: - **Small and contained**: Only 8 lines of actual logic changes - **Clear error path**: Only affects cleanup during error conditions - **No behavioral changes**: No impact on normal operation - **Low regression risk**: Only modifies error handling paths **7. Backport Suitability Criteria**: - ✅ Fixes important bug affecting users (memory leak) - ✅ Small, contained fix with minimal risk - ✅ No architectural changes - ✅ Addresses security concern (ASLR bypass potential) - ✅ Follows established patterns for ACPICA fixes - ✅ Critical kernel subsystem (ACPI) **8. Historical Precedent**: The similar commits in the reference examples (Similar Commits #1, #2, #3) all have "Backport Status: YES" and address nearly identical ACPICA operand cache leak issues with similar fixes and commit message patterns. This commit meets all criteria for stable tree backporting: it's an important bugfix, has minimal regression risk, affects a critical subsystem, and follows established patterns for similar fixes that were previously backported. drivers/acpi/acpica/dsutils.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/acpica/dsutils.c b/drivers/acpi/acpica/dsutils.c index fb9ed5e1da89d..2bdae8a25e084 100644 --- a/drivers/acpi/acpica/dsutils.c +++ b/drivers/acpi/acpica/dsutils.c @@ -668,6 +668,8 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS]; u32 arg_count = 0; u32 index = walk_state->num_operands; + u32 prev_num_operands = walk_state->num_operands; + u32 new_num_operands; u32 i; ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); @@ -696,6 +698,7 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, /* Create the interpreter arguments, in reverse order */ + new_num_operands = index; index--; for (i = 0; i < arg_count; i++) { arg = arguments[index]; @@ -720,7 +723,11 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, * pop everything off of the operand stack and delete those * objects */ - acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); + walk_state->num_operands = i; + acpi_ds_obj_stack_pop_and_delete(new_num_operands, walk_state); + + /* Restore operand count */ + walk_state->num_operands = prev_num_operands; ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index)); return_ACPI_STATUS(status); -- 2.39.5

1 month

1
17
0 0

[PATCH AUTOSEL 6.12 01/26] ACPICA: fix acpi operand cache leak in dswstate.c

by Sasha Levin

From: Seunghun Han <kkamagui(a)gmail.com> [ Upstream commit 156fd20a41e776bbf334bd5e45c4f78dfc90ce1c ] ACPICA commit 987a3b5cf7175916e2a4b6ea5b8e70f830dfe732 I found an ACPI cache leak in ACPI early termination and boot continuing case. When early termination occurs due to malicious ACPI table, Linux kernel terminates ACPI function and continues to boot process. While kernel terminates ACPI function, kmem_cache_destroy() reports Acpi-Operand cache leak. Boot log of ACPI operand cache leak is as follows: >[ 0.585957] ACPI: Added _OSI(Module Device) >[ 0.587218] ACPI: Added _OSI(Processor Device) >[ 0.588530] ACPI: Added _OSI(3.0 _SCP Extensions) >[ 0.589790] ACPI: Added _OSI(Processor Aggregator Device) >[ 0.591534] ACPI Error: Illegal I/O port address/length above 64K: C806E00000004002/0x2 (20170303/hwvalid-155) >[ 0.594351] ACPI Exception: AE_LIMIT, Unable to initialize fixed events (20170303/evevent-88) >[ 0.597858] ACPI: Unable to start the ACPI Interpreter >[ 0.599162] ACPI Error: Could not remove SCI handler (20170303/evmisc-281) >[ 0.601836] kmem_cache_destroy Acpi-Operand: Slab cache still has objects >[ 0.603556] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.12.0-rc5 #26 >[ 0.605159] Hardware name: innotek gmb_h virtual_box/virtual_box, BIOS virtual_box 12/01/2006 >[ 0.609177] Call Trace: >[ 0.610063] ? dump_stack+0x5c/0x81 >[ 0.611118] ? kmem_cache_destroy+0x1aa/0x1c0 >[ 0.612632] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.613906] ? acpi_os_delete_cache+0xa/0x10 >[ 0.617986] ? acpi_ut_delete_caches+0x3f/0x7b >[ 0.619293] ? acpi_terminate+0xa/0x14 >[ 0.620394] ? acpi_init+0x2af/0x34f >[ 0.621616] ? __class_create+0x4c/0x80 >[ 0.623412] ? video_setup+0x7f/0x7f >[ 0.624585] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.625861] ? do_one_initcall+0x4e/0x1a0 >[ 0.627513] ? kernel_init_freeable+0x19e/0x21f >[ 0.628972] ? rest_init+0x80/0x80 >[ 0.630043] ? kernel_init+0xa/0x100 >[ 0.631084] ? ret_from_fork+0x25/0x30 >[ 0.633343] vgaarb: loaded >[ 0.635036] EDAC MC: Ver: 3.0.0 >[ 0.638601] PCI: Probing PCI hardware >[ 0.639833] PCI host bridge to bus 0000:00 >[ 0.641031] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] > ... Continue to boot and log is omitted ... I analyzed this memory leak in detail and found acpi_ds_obj_stack_pop_and_ delete() function miscalculated the top of the stack. acpi_ds_obj_stack_push() function uses walk_state->operand_index for start position of the top, but acpi_ds_obj_stack_pop_and_delete() function considers index 0 for it. Therefore, this causes acpi operand memory leak. This cache leak causes a security threat because an old kernel (<= 4.9) shows memory locations of kernel functions in stack dump. Some malicious users could use this information to neutralize kernel ASLR. I made a patch to fix ACPI operand cache leak. Link: https://github.com/acpica/acpica/commit/987a3b5c Signed-off-by: Seunghun Han <kkamagui(a)gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Link: https://patch.msgid.link/4999480.31r3eYUQgx@rjwysocki.net Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- **YES** This commit should be backported to stable kernel trees based on the following analysis: ## Analysis of the Commit **1. Bug Fix Nature**: This commit fixes a clear memory leak bug in the ACPICA subsystem. The issue occurs when `acpi_ds_create_operands()` encounters an error during operand creation and needs to clean up allocated operands. **2. Root Cause**: The core issue is a mismatch between how operands are pushed and popped from the stack: - `acpi_ds_obj_stack_push()` uses `walk_state->operand_index` to track the current position - `acpi_ds_obj_stack_pop_and_delete()` incorrectly assumes operands start at index 0 - This causes incomplete cleanup when errors occur, leading to memory leaks **3. Code Analysis**: The fix correctly addresses the issue by: - Tracking the original operand count (`prev_num_operands`) - Calculating the correct number of operands to clean up (`new_num_operands`) - Setting `walk_state->num_operands = i` before cleanup to ensure proper indexing - Restoring the original operand count after cleanup **4. Security Implications**: The commit message explicitly mentions this is a security issue - the memory leak can expose kernel function addresses in older kernels (≤4.9), potentially defeating ASLR. This elevates the importance beyond a simple memory leak. **5. Pattern Consistency**: This follows the exact same pattern as other ACPICA operand cache leak fixes that were successfully backported (commits `97f3c0a4b057`, `2915f16bdce2`, etc.), all authored by the same developer addressing similar issues. **6. Stability Characteristics**: - **Small and contained**: Only 8 lines of actual logic changes - **Clear error path**: Only affects cleanup during error conditions - **No behavioral changes**: No impact on normal operation - **Low regression risk**: Only modifies error handling paths **7. Backport Suitability Criteria**: - ✅ Fixes important bug affecting users (memory leak) - ✅ Small, contained fix with minimal risk - ✅ No architectural changes - ✅ Addresses security concern (ASLR bypass potential) - ✅ Follows established patterns for ACPICA fixes - ✅ Critical kernel subsystem (ACPI) **8. Historical Precedent**: The similar commits in the reference examples (Similar Commits #1, #2, #3) all have "Backport Status: YES" and address nearly identical ACPICA operand cache leak issues with similar fixes and commit message patterns. This commit meets all criteria for stable tree backporting: it's an important bugfix, has minimal regression risk, affects a critical subsystem, and follows established patterns for similar fixes that were previously backported. drivers/acpi/acpica/dsutils.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/acpica/dsutils.c b/drivers/acpi/acpica/dsutils.c index fb9ed5e1da89d..2bdae8a25e084 100644 --- a/drivers/acpi/acpica/dsutils.c +++ b/drivers/acpi/acpica/dsutils.c @@ -668,6 +668,8 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS]; u32 arg_count = 0; u32 index = walk_state->num_operands; + u32 prev_num_operands = walk_state->num_operands; + u32 new_num_operands; u32 i; ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); @@ -696,6 +698,7 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, /* Create the interpreter arguments, in reverse order */ + new_num_operands = index; index--; for (i = 0; i < arg_count; i++) { arg = arguments[index]; @@ -720,7 +723,11 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, * pop everything off of the operand stack and delete those * objects */ - acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); + walk_state->num_operands = i; + acpi_ds_obj_stack_pop_and_delete(new_num_operands, walk_state); + + /* Restore operand count */ + walk_state->num_operands = prev_num_operands; ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index)); return_ACPI_STATUS(status); -- 2.39.5

1 month

1
25
0 0

[PATCH AUTOSEL 6.14 01/28] ACPICA: fix acpi operand cache leak in dswstate.c

by Sasha Levin

From: Seunghun Han <kkamagui(a)gmail.com> [ Upstream commit 156fd20a41e776bbf334bd5e45c4f78dfc90ce1c ] ACPICA commit 987a3b5cf7175916e2a4b6ea5b8e70f830dfe732 I found an ACPI cache leak in ACPI early termination and boot continuing case. When early termination occurs due to malicious ACPI table, Linux kernel terminates ACPI function and continues to boot process. While kernel terminates ACPI function, kmem_cache_destroy() reports Acpi-Operand cache leak. Boot log of ACPI operand cache leak is as follows: >[ 0.585957] ACPI: Added _OSI(Module Device) >[ 0.587218] ACPI: Added _OSI(Processor Device) >[ 0.588530] ACPI: Added _OSI(3.0 _SCP Extensions) >[ 0.589790] ACPI: Added _OSI(Processor Aggregator Device) >[ 0.591534] ACPI Error: Illegal I/O port address/length above 64K: C806E00000004002/0x2 (20170303/hwvalid-155) >[ 0.594351] ACPI Exception: AE_LIMIT, Unable to initialize fixed events (20170303/evevent-88) >[ 0.597858] ACPI: Unable to start the ACPI Interpreter >[ 0.599162] ACPI Error: Could not remove SCI handler (20170303/evmisc-281) >[ 0.601836] kmem_cache_destroy Acpi-Operand: Slab cache still has objects >[ 0.603556] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.12.0-rc5 #26 >[ 0.605159] Hardware name: innotek gmb_h virtual_box/virtual_box, BIOS virtual_box 12/01/2006 >[ 0.609177] Call Trace: >[ 0.610063] ? dump_stack+0x5c/0x81 >[ 0.611118] ? kmem_cache_destroy+0x1aa/0x1c0 >[ 0.612632] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.613906] ? acpi_os_delete_cache+0xa/0x10 >[ 0.617986] ? acpi_ut_delete_caches+0x3f/0x7b >[ 0.619293] ? acpi_terminate+0xa/0x14 >[ 0.620394] ? acpi_init+0x2af/0x34f >[ 0.621616] ? __class_create+0x4c/0x80 >[ 0.623412] ? video_setup+0x7f/0x7f >[ 0.624585] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.625861] ? do_one_initcall+0x4e/0x1a0 >[ 0.627513] ? kernel_init_freeable+0x19e/0x21f >[ 0.628972] ? rest_init+0x80/0x80 >[ 0.630043] ? kernel_init+0xa/0x100 >[ 0.631084] ? ret_from_fork+0x25/0x30 >[ 0.633343] vgaarb: loaded >[ 0.635036] EDAC MC: Ver: 3.0.0 >[ 0.638601] PCI: Probing PCI hardware >[ 0.639833] PCI host bridge to bus 0000:00 >[ 0.641031] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] > ... Continue to boot and log is omitted ... I analyzed this memory leak in detail and found acpi_ds_obj_stack_pop_and_ delete() function miscalculated the top of the stack. acpi_ds_obj_stack_push() function uses walk_state->operand_index for start position of the top, but acpi_ds_obj_stack_pop_and_delete() function considers index 0 for it. Therefore, this causes acpi operand memory leak. This cache leak causes a security threat because an old kernel (<= 4.9) shows memory locations of kernel functions in stack dump. Some malicious users could use this information to neutralize kernel ASLR. I made a patch to fix ACPI operand cache leak. Link: https://github.com/acpica/acpica/commit/987a3b5c Signed-off-by: Seunghun Han <kkamagui(a)gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Link: https://patch.msgid.link/4999480.31r3eYUQgx@rjwysocki.net Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- **YES** This commit should be backported to stable kernel trees based on the following analysis: ## Analysis of the Commit **1. Bug Fix Nature**: This commit fixes a clear memory leak bug in the ACPICA subsystem. The issue occurs when `acpi_ds_create_operands()` encounters an error during operand creation and needs to clean up allocated operands. **2. Root Cause**: The core issue is a mismatch between how operands are pushed and popped from the stack: - `acpi_ds_obj_stack_push()` uses `walk_state->operand_index` to track the current position - `acpi_ds_obj_stack_pop_and_delete()` incorrectly assumes operands start at index 0 - This causes incomplete cleanup when errors occur, leading to memory leaks **3. Code Analysis**: The fix correctly addresses the issue by: - Tracking the original operand count (`prev_num_operands`) - Calculating the correct number of operands to clean up (`new_num_operands`) - Setting `walk_state->num_operands = i` before cleanup to ensure proper indexing - Restoring the original operand count after cleanup **4. Security Implications**: The commit message explicitly mentions this is a security issue - the memory leak can expose kernel function addresses in older kernels (≤4.9), potentially defeating ASLR. This elevates the importance beyond a simple memory leak. **5. Pattern Consistency**: This follows the exact same pattern as other ACPICA operand cache leak fixes that were successfully backported (commits `97f3c0a4b057`, `2915f16bdce2`, etc.), all authored by the same developer addressing similar issues. **6. Stability Characteristics**: - **Small and contained**: Only 8 lines of actual logic changes - **Clear error path**: Only affects cleanup during error conditions - **No behavioral changes**: No impact on normal operation - **Low regression risk**: Only modifies error handling paths **7. Backport Suitability Criteria**: - ✅ Fixes important bug affecting users (memory leak) - ✅ Small, contained fix with minimal risk - ✅ No architectural changes - ✅ Addresses security concern (ASLR bypass potential) - ✅ Follows established patterns for ACPICA fixes - ✅ Critical kernel subsystem (ACPI) **8. Historical Precedent**: The similar commits in the reference examples (Similar Commits #1, #2, #3) all have "Backport Status: YES" and address nearly identical ACPICA operand cache leak issues with similar fixes and commit message patterns. This commit meets all criteria for stable tree backporting: it's an important bugfix, has minimal regression risk, affects a critical subsystem, and follows established patterns for similar fixes that were previously backported. drivers/acpi/acpica/dsutils.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/acpica/dsutils.c b/drivers/acpi/acpica/dsutils.c index fb9ed5e1da89d..2bdae8a25e084 100644 --- a/drivers/acpi/acpica/dsutils.c +++ b/drivers/acpi/acpica/dsutils.c @@ -668,6 +668,8 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS]; u32 arg_count = 0; u32 index = walk_state->num_operands; + u32 prev_num_operands = walk_state->num_operands; + u32 new_num_operands; u32 i; ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); @@ -696,6 +698,7 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, /* Create the interpreter arguments, in reverse order */ + new_num_operands = index; index--; for (i = 0; i < arg_count; i++) { arg = arguments[index]; @@ -720,7 +723,11 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, * pop everything off of the operand stack and delete those * objects */ - acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); + walk_state->num_operands = i; + acpi_ds_obj_stack_pop_and_delete(new_num_operands, walk_state); + + /* Restore operand count */ + walk_state->num_operands = prev_num_operands; ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index)); return_ACPI_STATUS(status); -- 2.39.5

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[PATCH AUTOSEL 6.15 01/30] ACPICA: fix acpi operand cache leak in dswstate.c

by Sasha Levin

From: Seunghun Han <kkamagui(a)gmail.com> [ Upstream commit 156fd20a41e776bbf334bd5e45c4f78dfc90ce1c ] ACPICA commit 987a3b5cf7175916e2a4b6ea5b8e70f830dfe732 I found an ACPI cache leak in ACPI early termination and boot continuing case. When early termination occurs due to malicious ACPI table, Linux kernel terminates ACPI function and continues to boot process. While kernel terminates ACPI function, kmem_cache_destroy() reports Acpi-Operand cache leak. Boot log of ACPI operand cache leak is as follows: >[ 0.585957] ACPI: Added _OSI(Module Device) >[ 0.587218] ACPI: Added _OSI(Processor Device) >[ 0.588530] ACPI: Added _OSI(3.0 _SCP Extensions) >[ 0.589790] ACPI: Added _OSI(Processor Aggregator Device) >[ 0.591534] ACPI Error: Illegal I/O port address/length above 64K: C806E00000004002/0x2 (20170303/hwvalid-155) >[ 0.594351] ACPI Exception: AE_LIMIT, Unable to initialize fixed events (20170303/evevent-88) >[ 0.597858] ACPI: Unable to start the ACPI Interpreter >[ 0.599162] ACPI Error: Could not remove SCI handler (20170303/evmisc-281) >[ 0.601836] kmem_cache_destroy Acpi-Operand: Slab cache still has objects >[ 0.603556] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.12.0-rc5 #26 >[ 0.605159] Hardware name: innotek gmb_h virtual_box/virtual_box, BIOS virtual_box 12/01/2006 >[ 0.609177] Call Trace: >[ 0.610063] ? dump_stack+0x5c/0x81 >[ 0.611118] ? kmem_cache_destroy+0x1aa/0x1c0 >[ 0.612632] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.613906] ? acpi_os_delete_cache+0xa/0x10 >[ 0.617986] ? acpi_ut_delete_caches+0x3f/0x7b >[ 0.619293] ? acpi_terminate+0xa/0x14 >[ 0.620394] ? acpi_init+0x2af/0x34f >[ 0.621616] ? __class_create+0x4c/0x80 >[ 0.623412] ? video_setup+0x7f/0x7f >[ 0.624585] ? acpi_sleep_proc_init+0x27/0x27 >[ 0.625861] ? do_one_initcall+0x4e/0x1a0 >[ 0.627513] ? kernel_init_freeable+0x19e/0x21f >[ 0.628972] ? rest_init+0x80/0x80 >[ 0.630043] ? kernel_init+0xa/0x100 >[ 0.631084] ? ret_from_fork+0x25/0x30 >[ 0.633343] vgaarb: loaded >[ 0.635036] EDAC MC: Ver: 3.0.0 >[ 0.638601] PCI: Probing PCI hardware >[ 0.639833] PCI host bridge to bus 0000:00 >[ 0.641031] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] > ... Continue to boot and log is omitted ... I analyzed this memory leak in detail and found acpi_ds_obj_stack_pop_and_ delete() function miscalculated the top of the stack. acpi_ds_obj_stack_push() function uses walk_state->operand_index for start position of the top, but acpi_ds_obj_stack_pop_and_delete() function considers index 0 for it. Therefore, this causes acpi operand memory leak. This cache leak causes a security threat because an old kernel (<= 4.9) shows memory locations of kernel functions in stack dump. Some malicious users could use this information to neutralize kernel ASLR. I made a patch to fix ACPI operand cache leak. Link: https://github.com/acpica/acpica/commit/987a3b5c Signed-off-by: Seunghun Han <kkamagui(a)gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Link: https://patch.msgid.link/4999480.31r3eYUQgx@rjwysocki.net Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- **YES** This commit should be backported to stable kernel trees based on the following analysis: ## Analysis of the Commit **1. Bug Fix Nature**: This commit fixes a clear memory leak bug in the ACPICA subsystem. The issue occurs when `acpi_ds_create_operands()` encounters an error during operand creation and needs to clean up allocated operands. **2. Root Cause**: The core issue is a mismatch between how operands are pushed and popped from the stack: - `acpi_ds_obj_stack_push()` uses `walk_state->operand_index` to track the current position - `acpi_ds_obj_stack_pop_and_delete()` incorrectly assumes operands start at index 0 - This causes incomplete cleanup when errors occur, leading to memory leaks **3. Code Analysis**: The fix correctly addresses the issue by: - Tracking the original operand count (`prev_num_operands`) - Calculating the correct number of operands to clean up (`new_num_operands`) - Setting `walk_state->num_operands = i` before cleanup to ensure proper indexing - Restoring the original operand count after cleanup **4. Security Implications**: The commit message explicitly mentions this is a security issue - the memory leak can expose kernel function addresses in older kernels (≤4.9), potentially defeating ASLR. This elevates the importance beyond a simple memory leak. **5. Pattern Consistency**: This follows the exact same pattern as other ACPICA operand cache leak fixes that were successfully backported (commits `97f3c0a4b057`, `2915f16bdce2`, etc.), all authored by the same developer addressing similar issues. **6. Stability Characteristics**: - **Small and contained**: Only 8 lines of actual logic changes - **Clear error path**: Only affects cleanup during error conditions - **No behavioral changes**: No impact on normal operation - **Low regression risk**: Only modifies error handling paths **7. Backport Suitability Criteria**: - ✅ Fixes important bug affecting users (memory leak) - ✅ Small, contained fix with minimal risk - ✅ No architectural changes - ✅ Addresses security concern (ASLR bypass potential) - ✅ Follows established patterns for ACPICA fixes - ✅ Critical kernel subsystem (ACPI) **8. Historical Precedent**: The similar commits in the reference examples (Similar Commits #1, #2, #3) all have "Backport Status: YES" and address nearly identical ACPICA operand cache leak issues with similar fixes and commit message patterns. This commit meets all criteria for stable tree backporting: it's an important bugfix, has minimal regression risk, affects a critical subsystem, and follows established patterns for similar fixes that were previously backported. drivers/acpi/acpica/dsutils.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/acpica/dsutils.c b/drivers/acpi/acpica/dsutils.c index fb9ed5e1da89d..2bdae8a25e084 100644 --- a/drivers/acpi/acpica/dsutils.c +++ b/drivers/acpi/acpica/dsutils.c @@ -668,6 +668,8 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS]; u32 arg_count = 0; u32 index = walk_state->num_operands; + u32 prev_num_operands = walk_state->num_operands; + u32 new_num_operands; u32 i; ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); @@ -696,6 +698,7 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, /* Create the interpreter arguments, in reverse order */ + new_num_operands = index; index--; for (i = 0; i < arg_count; i++) { arg = arguments[index]; @@ -720,7 +723,11 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state, * pop everything off of the operand stack and delete those * objects */ - acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); + walk_state->num_operands = i; + acpi_ds_obj_stack_pop_and_delete(new_num_operands, walk_state); + + /* Restore operand count */ + walk_state->num_operands = prev_num_operands; ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index)); return_ACPI_STATUS(status); -- 2.39.5

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[PATCH v2] mmc: sdhci-omap: Add error handling for sdhci_runtime_suspend_host()

by Wentao Liang

The sdhci_omap_runtime_suspend() calls sdhci_runtime_suspend_host() but does not handle the return value. A proper implementation can be found in sdhci_am654_runtime_suspend(). Add error handling for sdhci_runtime_suspend_host(). Return the error code if the suspend fails. Fixes: 51189eb9ddc8 ("mmc: sdhci-omap: Fix a lockdep warning for PM runtime init") Cc: stable(a)vger.kernel.org # 5.19 Signed-off-by: Wentao Liang <vulab(a)iscas.ac.cn> --- v2: Fix code error. drivers/mmc/host/sdhci-omap.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c index 54d795205fb4..f09f78cf244d 100644 --- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -1438,12 +1438,16 @@ static int __maybe_unused sdhci_omap_runtime_suspend(struct device *dev) struct sdhci_host *host = dev_get_drvdata(dev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host); + int ret; if (host->tuning_mode != SDHCI_TUNING_MODE_3) mmc_retune_needed(host->mmc); - if (omap_host->con != -EINVAL) - sdhci_runtime_suspend_host(host); + if (omap_host->con != -EINVAL) { + ret = sdhci_runtime_suspend_host(host); + if (ret) + return ret; + } sdhci_omap_context_save(omap_host); -- 2.42.0.windows.2

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