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Miscellaneous fixes:

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- Fix kexec() crash if call depth tracking is enabled
 
  - Fix SMN reads on inaccessible registers on certain AMD systems
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2024-06-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:
 "Miscellaneous fixes:

   - Fix kexec() crash if call depth tracking is enabled

   - Fix SMN reads on inaccessible registers on certain AMD systems"

* tag 'x86-urgent-2024-06-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/amd_nb: Check for invalid SMN reads
  x86/kexec: Fix bug with call depth tracking
This commit is contained in:
Linus Torvalds 2024-06-08 09:36:08 -07:00
commit 7cedb020d5
2 changed files with 17 additions and 3 deletions
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9
arch/x86/kernel/amd_nb.c
View file

@ -215,7 +215,14 @@ out:
int amd_smn_read(u16 node, u32 address, u32 *value)
{
return __amd_smn_rw(node, address, value, false);
int err = __amd_smn_rw(node, address, value, false);
if (PCI_POSSIBLE_ERROR(*value)) {
err = -ENODEV;
*value = 0;
}
return err;
}
EXPORT_SYMBOL_GPL(amd_smn_read);

11
arch/x86/kernel/machine_kexec_64.c
View file

@ -295,8 +295,15 @@ void machine_kexec_cleanup(struct kimage *image)
void machine_kexec(struct kimage *image)
{
unsigned long page_list[PAGES_NR];
void *control_page;
unsigned int host_mem_enc_active;
int save_ftrace_enabled;
void *control_page;
/*
* This must be done before load_segments() since if call depth tracking
* is used then GS must be valid to make any function calls.
*/
host_mem_enc_active = cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT);
#ifdef CONFIG_KEXEC_JUMP
if (image->preserve_context)
@ -358,7 +365,7 @@ void machine_kexec(struct kimage *image)
(unsigned long)page_list,
image->start,
image->preserve_context,
cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT));
host_mem_enc_active);
#ifdef CONFIG_KEXEC_JUMP
if (image->preserve_context)