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authorHelge Deller <deller@gmx.de>2021-11-21 11:10:55 +0100
committerHelge Deller <deller@gmx.de>2021-11-22 07:37:31 +0100
commit98400ad75e95860e9a10ec78b0b90ab66184a2ce (patch)
tree0b93bc1ce9a20537e60e0858c5ea760664581dfa /arch
parent3fbdc121bd051d9f1b3b2e232ad734c44b47d32c (diff)
Revert "parisc: Fix backtrace to always include init funtion names"
This reverts commit 279917e27edc293eb645a25428c6ab3f3bca3f86. With the CONFIG_HARDENED_USERCOPY option enabled, this patch triggers kernel bugs at runtime: usercopy: Kernel memory overwrite attempt detected to kernel text (offset 2084839, size 6)! kernel BUG at mm/usercopy.c:99! Backtrace: IAOQ[0]: usercopy_abort+0xc4/0xe8 [<00000000406ed1c8>] __check_object_size+0x174/0x238 [<00000000407086d4>] copy_strings.isra.0+0x3e8/0x708 [<0000000040709a20>] do_execveat_common.isra.0+0x1bc/0x328 [<000000004070b760>] compat_sys_execve+0x7c/0xb8 [<0000000040303eb8>] syscall_exit+0x0/0x14 The problem is, that we have an init section of at least 2MB size which starts at _stext and is freed after bootup. If then later some kernel data is (temporarily) stored in this free memory, check_kernel_text_object() will trigger a bug since the data appears to be inside the kernel text (>=_stext) area: if (overlaps(ptr, len, _stext, _etext)) usercopy_abort("kernel text"); Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@kernel.org # 5.4+
Diffstat (limited to 'arch')
-rw-r--r--arch/parisc/kernel/vmlinux.lds.S3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S
index 3d208afd15bc..2769eb991f58 100644
--- a/arch/parisc/kernel/vmlinux.lds.S
+++ b/arch/parisc/kernel/vmlinux.lds.S
@@ -57,8 +57,6 @@ SECTIONS
{
. = KERNEL_BINARY_TEXT_START;
- _stext = .; /* start of kernel text, includes init code & data */
-
__init_begin = .;
HEAD_TEXT_SECTION
MLONGCALL_DISCARD(INIT_TEXT_SECTION(8))
@@ -82,6 +80,7 @@ SECTIONS
/* freed after init ends here */
_text = .; /* Text and read-only data */
+ _stext = .;
MLONGCALL_KEEP(INIT_TEXT_SECTION(8))
.text ALIGN(PAGE_SIZE) : {
TEXT_TEXT