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authorLinus Torvalds <torvalds@linux-foundation.org>2018-05-20 11:28:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-05-20 11:28:32 -0700
commit8a6bd2f40e96fb4d96749ab029c61f0df218b003 (patch)
tree33bbe31fad29d88c066f91fb577c92496f659122 /arch/x86/boot
parentb9aad92236391f681083fa4045083d5b846b59e0 (diff)
parentacf46020012ccbca1172e9c7aeab399c950d9212 (diff)
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Thomas Gleixner: "An unfortunately larger set of fixes, but a large portion is selftests: - Fix the missing clusterid initializaiton for x2apic cluster management which caused boot failures due to IPIs being sent to the wrong cluster - Drop TX_COMPAT when a 64bit executable is exec()'ed from a compat task - Wrap access to __supported_pte_mask in __startup_64() where clang compile fails due to a non PC relative access being generated. - Two fixes for 5 level paging fallout in the decompressor: - Handle GOT correctly for paging_prepare() and cleanup_trampoline() - Fix the page table handling in cleanup_trampoline() to avoid page table corruption. - Stop special casing protection key 0 as this is inconsistent with the manpage and also inconsistent with the allocation map handling. - Override the protection key wen moving away from PROT_EXEC to prevent inaccessible memory. - Fix and update the protection key selftests to address breakage and to cover the above issue - Add a MOV SS self test" [ Part of the x86 fixes were in the earlier core pull due to dependencies ] * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (21 commits) x86/mm: Drop TS_COMPAT on 64-bit exec() syscall x86/apic/x2apic: Initialize cluster ID properly x86/boot/compressed/64: Fix moving page table out of trampoline memory x86/boot/compressed/64: Set up GOT for paging_prepare() and cleanup_trampoline() x86/pkeys: Do not special case protection key 0 x86/pkeys/selftests: Add a test for pkey 0 x86/pkeys/selftests: Save off 'prot' for allocations x86/pkeys/selftests: Fix pointer math x86/pkeys: Override pkey when moving away from PROT_EXEC x86/pkeys/selftests: Fix pkey exhaustion test off-by-one x86/pkeys/selftests: Add PROT_EXEC test x86/pkeys/selftests: Factor out "instruction page" x86/pkeys/selftests: Allow faults on unknown keys x86/pkeys/selftests: Avoid printf-in-signal deadlocks x86/pkeys/selftests: Remove dead debugging code, fix dprint_in_signal x86/pkeys/selftests: Stop using assert() x86/pkeys/selftests: Give better unexpected fault error messages x86/selftests: Add mov_to_ss test x86/mpx/selftests: Adjust the self-test to fresh distros that export the MPX ABI x86/pkeys/selftests: Adjust the self-test to fresh distros that export the pkeys ABI ...
Diffstat (limited to 'arch/x86/boot')
-rw-r--r--arch/x86/boot/compressed/head_64.S79
-rw-r--r--arch/x86/boot/compressed/pgtable_64.c14
2 files changed, 69 insertions, 24 deletions
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index fca012baba19..8169e8b7a4dc 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -306,6 +306,25 @@ ENTRY(startup_64)
leaq boot_stack_end(%rbx), %rsp
/*
+ * paging_prepare() and cleanup_trampoline() below can have GOT
+ * references. Adjust the table with address we are running at.
+ *
+ * Zero RAX for adjust_got: the GOT was not adjusted before;
+ * there's no adjustment to undo.
+ */
+ xorq %rax, %rax
+
+ /*
+ * Calculate the address the binary is loaded at and use it as
+ * a GOT adjustment.
+ */
+ call 1f
+1: popq %rdi
+ subq $1b, %rdi
+
+ call adjust_got
+
+ /*
* At this point we are in long mode with 4-level paging enabled,
* but we might want to enable 5-level paging or vice versa.
*
@@ -370,10 +389,14 @@ trampoline_return:
/*
* cleanup_trampoline() would restore trampoline memory.
*
+ * RDI is address of the page table to use instead of page table
+ * in trampoline memory (if required).
+ *
* RSI holds real mode data and needs to be preserved across
* this function call.
*/
pushq %rsi
+ leaq top_pgtable(%rbx), %rdi
call cleanup_trampoline
popq %rsi
@@ -381,6 +404,21 @@ trampoline_return:
pushq $0
popfq
+ /*
+ * Previously we've adjusted the GOT with address the binary was
+ * loaded at. Now we need to re-adjust for relocation address.
+ *
+ * Calculate the address the binary is loaded at, so that we can
+ * undo the previous GOT adjustment.
+ */
+ call 1f
+1: popq %rax
+ subq $1b, %rax
+
+ /* The new adjustment is the relocation address */
+ movq %rbx, %rdi
+ call adjust_got
+
/*
* Copy the compressed kernel to the end of our buffer
* where decompression in place becomes safe.
@@ -482,19 +520,6 @@ relocated:
rep stosq
/*
- * Adjust our own GOT
- */
- leaq _got(%rip), %rdx
- leaq _egot(%rip), %rcx
-1:
- cmpq %rcx, %rdx
- jae 2f
- addq %rbx, (%rdx)
- addq $8, %rdx
- jmp 1b
-2:
-
-/*
* Do the extraction, and jump to the new kernel..
*/
pushq %rsi /* Save the real mode argument */
@@ -512,6 +537,27 @@ relocated:
*/
jmp *%rax
+/*
+ * Adjust the global offset table
+ *
+ * RAX is the previous adjustment of the table to undo (use 0 if it's the
+ * first time we touch GOT).
+ * RDI is the new adjustment to apply.
+ */
+adjust_got:
+ /* Walk through the GOT adding the address to the entries */
+ leaq _got(%rip), %rdx
+ leaq _egot(%rip), %rcx
+1:
+ cmpq %rcx, %rdx
+ jae 2f
+ subq %rax, (%rdx) /* Undo previous adjustment */
+ addq %rdi, (%rdx) /* Apply the new adjustment */
+ addq $8, %rdx
+ jmp 1b
+2:
+ ret
+
.code32
/*
* This is the 32-bit trampoline that will be copied over to low memory.
@@ -649,3 +695,10 @@ boot_stack_end:
.balign 4096
pgtable:
.fill BOOT_PGT_SIZE, 1, 0
+
+/*
+ * The page table is going to be used instead of page table in the trampoline
+ * memory.
+ */
+top_pgtable:
+ .fill PAGE_SIZE, 1, 0
diff --git a/arch/x86/boot/compressed/pgtable_64.c b/arch/x86/boot/compressed/pgtable_64.c
index 32af1cbcd903..a362fa0b849c 100644
--- a/arch/x86/boot/compressed/pgtable_64.c
+++ b/arch/x86/boot/compressed/pgtable_64.c
@@ -23,14 +23,6 @@ struct paging_config {
static char trampoline_save[TRAMPOLINE_32BIT_SIZE];
/*
- * The page table is going to be used instead of page table in the trampoline
- * memory.
- *
- * It must not be in BSS as BSS is cleared after cleanup_trampoline().
- */
-static char top_pgtable[PAGE_SIZE] __aligned(PAGE_SIZE) __section(.data);
-
-/*
* Trampoline address will be printed by extract_kernel() for debugging
* purposes.
*
@@ -134,7 +126,7 @@ out:
return paging_config;
}
-void cleanup_trampoline(void)
+void cleanup_trampoline(void *pgtable)
{
void *trampoline_pgtable;
@@ -145,8 +137,8 @@ void cleanup_trampoline(void)
* if it's there.
*/
if ((void *)__native_read_cr3() == trampoline_pgtable) {
- memcpy(top_pgtable, trampoline_pgtable, PAGE_SIZE);
- native_write_cr3((unsigned long)top_pgtable);
+ memcpy(pgtable, trampoline_pgtable, PAGE_SIZE);
+ native_write_cr3((unsigned long)pgtable);
}
/* Restore trampoline memory */