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0003-x86_64-fix-for-adding-top_of_kernel_stack_...
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File 0003-x86_64-fix-for-adding-top_of_kernel_stack_padding-fo.patch of Package crash
From: Lianbo Jiang <lijiang@redhat.com> Date: Fri, 7 Jun 2024 15:29:23 +0800 Subject: x86_64: fix for adding top_of_kernel_stack_padding for kernel stack Git-repo: https://github.com/crash-utility/crash.git Git-commit: 48764a14bc5856f0b0bb30685336c68b832154fc Patch-mainline: 8.0.6 References: bsc#1228388 With Kernel commit 65c9cc9e2c14 ("x86/fred: Reserve space for the FRED stack frame") in Linux 6.9-rc1 and later, x86_64 will add extra padding ('TOP_OF_KERNEL_STACK_PADDING (2 * 8)', see: arch/x86/include/asm\ /thread_info.h,) for kernel stack when the CONFIG_X86_FRED is enabled. As a result, the pt_regs will be moved downwards due to the offset of padding, and the values of registers read from pt_regs will be incorrect as below. Without the patch: crash> bt PID: 2040 TASK: ffff969136fc4180 CPU: 16 COMMAND: "bash" #0 [ffffa996409aba38] machine_kexec at ffffffff9f881eb7 #1 [ffffa996409aba90] __crash_kexec at ffffffff9fa1e49e #2 [ffffa996409abb48] panic at ffffffff9f91a6cd #3 [ffffa996409abbc8] sysrq_handle_crash at ffffffffa0015076 #4 [ffffa996409abbd0] __handle_sysrq at ffffffffa0015640 #5 [ffffa996409abc00] write_sysrq_trigger at ffffffffa0015ce5 #6 [ffffa996409abc28] proc_reg_write at ffffffff9fd35bf5 #7 [ffffa996409abc40] vfs_write at ffffffff9fc8d462 #8 [ffffa996409abcd0] ksys_write at ffffffff9fc8dadf #9 [ffffa996409abd08] do_syscall_64 at ffffffffa0517429 #10 [ffffa996409abf40] entry_SYSCALL_64_after_hwframe at ffffffffa060012b [exception RIP: unknown or invalid address] RIP: 0000000000000246 RSP: 0000000000000000 RFLAGS: 0000002b RAX: 0000000000000002 RBX: 00007f9b9f5b13e0 RCX: 000055cee7486fb0 RDX: 0000000000000001 RSI: 0000000000000001 RDI: 00007f9b9f4fda57 RBP: 0000000000000246 R8: 00007f9b9f4fda57 R9: ffffffffffffffda R10: 0000000000000000 R11: 00007f9b9f5b14e0 R12: 0000000000000002 R13: 000055cee7486fb0 R14: 0000000000000002 R15: 00007f9b9f5fb780 ORIG_RAX: 0000000000000033 CS: 7ffe65327978 SS: 0000 bt: WARNING: possibly bogus exception frame crash> With the patch: crash> bt PID: 2040 TASK: ffff969136fc4180 CPU: 16 COMMAND: "bash" #0 [ffffa996409aba38] machine_kexec at ffffffff9f881eb7 #1 [ffffa996409aba90] __crash_kexec at ffffffff9fa1e49e #2 [ffffa996409abb48] panic at ffffffff9f91a6cd #3 [ffffa996409abbc8] sysrq_handle_crash at ffffffffa0015076 #4 [ffffa996409abbd0] __handle_sysrq at ffffffffa0015640 #5 [ffffa996409abc00] write_sysrq_trigger at ffffffffa0015ce5 #6 [ffffa996409abc28] proc_reg_write at ffffffff9fd35bf5 #7 [ffffa996409abc40] vfs_write at ffffffff9fc8d462 #8 [ffffa996409abcd0] ksys_write at ffffffff9fc8dadf #9 [ffffa996409abd08] do_syscall_64 at ffffffffa0517429 #10 [ffffa996409abf40] entry_SYSCALL_64_after_hwframe at ffffffffa060012b RIP: 00007f9b9f4fda57 RSP: 00007ffe65327978 RFLAGS: 00000246 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f9b9f4fda57 RDX: 0000000000000002 RSI: 000055cee7486fb0 RDI: 0000000000000001 RBP: 000055cee7486fb0 R8: 0000000000000000 R9: 00007f9b9f5b14e0 R10: 00007f9b9f5b13e0 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f9b9f5fb780 R14: 0000000000000002 R15: 00007f9b9f5f69e0 ORIG_RAX: 0000000000000001 CS: 0033 SS: 002b crash> Link: https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg00754.html Signed-off-by: Lianbo Jiang <lijiang@redhat.com> Signed-off-by: Tao Liu <ltao@redhat.com> Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> --- defs.h | 1 + kernel.c | 1 + symbols.c | 1 + x86_64.c | 6 ++++-- 4 files changed, 7 insertions(+), 2 deletions(-) diff --git a/defs.h b/defs.h index 01f316e67dde..42d875965256 100644 --- a/defs.h +++ b/defs.h @@ -2414,6 +2414,7 @@ struct size_table { /* stash of commonly-used sizes */ long maple_tree; long maple_node; long module_memory; + long fred_frame; }; struct array_table { diff --git a/kernel.c b/kernel.c index 1728b70c1b5c..cd3d6044cc9a 100644 --- a/kernel.c +++ b/kernel.c @@ -668,6 +668,7 @@ kernel_init() STRUCT_SIZE_INIT(softirq_state, "softirq_state"); STRUCT_SIZE_INIT(softirq_action, "softirq_action"); STRUCT_SIZE_INIT(desc_struct, "desc_struct"); + STRUCT_SIZE_INIT(fred_frame, "fred_frame"); STRUCT_SIZE_INIT(char_device_struct, "char_device_struct"); if (VALID_STRUCT(char_device_struct)) { diff --git a/symbols.c b/symbols.c index b7627a83587a..301ce3533da9 100644 --- a/symbols.c +++ b/symbols.c @@ -11847,6 +11847,7 @@ dump_offset_table(char *spec, ulong makestruct) fprintf(fp, " task_struct_flags: %ld\n", SIZE(task_struct_flags)); fprintf(fp, " task_struct_policy: %ld\n", SIZE(task_struct_policy)); fprintf(fp, " thread_info: %ld\n", SIZE(thread_info)); + fprintf(fp, " fred_frame: %ld\n", SIZE(fred_frame)); fprintf(fp, " softirq_state: %ld\n", SIZE(softirq_state)); fprintf(fp, " softirq_action: %ld\n", diff --git a/x86_64.c b/x86_64.c index 0c21eb827e4a..6777c93e6b47 100644 --- a/x86_64.c +++ b/x86_64.c @@ -4086,10 +4086,11 @@ in_exception_stack: if (!irq_eframe && !is_kernel_thread(bt->tc->task) && (GET_STACKBASE(bt->tc->task) == bt->stackbase)) { + long stack_padding_size = SIZE(fred_frame) > 0 ? (2*8) : 0; user_mode_eframe = bt->stacktop - SIZE(pt_regs); if (last_process_stack_eframe < user_mode_eframe) x86_64_exception_frame(EFRAME_PRINT, 0, bt->stackbuf + - (bt->stacktop - bt->stackbase) - SIZE(pt_regs), + (bt->stacktop - stack_padding_size - bt->stackbase) - SIZE(pt_regs), bt, ofp); } @@ -4407,10 +4408,11 @@ in_exception_stack: if (!irq_eframe && !is_kernel_thread(bt->tc->task) && (GET_STACKBASE(bt->tc->task) == bt->stackbase)) { + long stack_padding_size = SIZE(fred_frame) > 0 ? (2*8) : 0; user_mode_eframe = bt->stacktop - SIZE(pt_regs); if (last_process_stack_eframe < user_mode_eframe) x86_64_exception_frame(EFRAME_PRINT, 0, bt->stackbuf + - (bt->stacktop - bt->stackbase) - SIZE(pt_regs), + (bt->stacktop - stack_padding_size - bt->stackbase) - SIZE(pt_regs), bt, ofp); } -- 2.45.2
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