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File 0007-X86-64-fix-a-regression-issue-about-kernel-stack-pad.patch of Package crash (Revision dc8b1732d20018a0317a41c57c94fe78)

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From: Lianbo Jiang <lijiang@redhat.com>
Date: Wed, 12 Jun 2024 11:00:00 +0800
Subject: X86 64: fix a regression issue about kernel stack padding
Git-repo: https://github.com/crash-utility/crash.git
Git-commit: 196c4b79c13d1c0e6d7b21c8321eca07d3838d6a
Patch-mainline: 8.0.6
References: bsc#1228388

The commit 48764a14bc58 may cause a regression issue when the CONFIG_X86_FRED
is not enabled, this is because the SIZE(fred_frame) will call the
SIZE_verify() to determine if the fred_frame is valid, otherwise it will
emit an error:

crash> bt 1

bt: invalid structure size: fred_frame
        FILE: x86_64.c  LINE: 4089  FUNCTION: x86_64_low_budget_back_trace_cmd()

[/home/k-hagio/bin/crash] error trace: 588df3 => 5cbc72 => 5eb3e1 => 5eb366
  PID: 1        TASK: ffff9f94c024b980  CPU: 2    COMMAND: "systemd"
     #0 [ffffade44001bca8] __schedule at ffffffffb948ebbb
     #1 [ffffade44001bd10] schedule at ffffffffb948f04d
     #2 [ffffade44001bd20] schedule_hrtimeout_range_clock at ffffffffb9494fef
     #3 [ffffade44001bda8] ep_poll at ffffffffb8c91be8
     #4 [ffffade44001be48] do_epoll_wait at ffffffffb8c91d11
     #5 [ffffade44001be80] __x64_sys_epoll_wait at ffffffffb8c92590
     #6 [ffffade44001bed0] do_syscall_64 at ffffffffb947f459
     #7 [ffffade44001bf50] entry_SYSCALL_64_after_hwframe at ffffffffb96000ea

5eb366: SIZE_verify.part.42+70
      5eb3e1: SIZE_verify+49
      5cbc72: x86_64_low_budget_back_trace_cmd+3010
      588df3: back_trace+1523

bt: invalid structure size: fred_frame
        FILE: x86_64.c  LINE: 4089  FUNCTION: x86_64_low_budget_back_trace_cmd()

Let's replace the SIZE(fred_frame) with the VALID_SIZE(fred_frame) to
fix it.

Fixes: 48764a14bc58 ("x86_64: fix for adding top_of_kernel_stack_padding for kernel stack")
Reported-by: Kazuhito Hagio <k-hagio-ab@nec.com>
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
---
 x86_64.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/x86_64.c b/x86_64.c
index 6777c93e6b47..469d26b05e24 100644
--- a/x86_64.c
+++ b/x86_64.c
@@ -4086,7 +4086,7 @@ 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;
+		long stack_padding_size = VALID_SIZE(fred_frame) ? (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 +
@@ -4408,7 +4408,7 @@ 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;
+		long stack_padding_size = VALID_SIZE(fred_frame) ? (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 +
-- 
2.45.2

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File 0007-X86-64-fix-a-regression-issue-about-kernel-stack-pad.patch of Package crash (Revision dc8b1732d20018a0317a41c57c94fe78)

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