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riscv: Fixup bootup failure with HARDENED_USERCOPY 

6184358da0 ("riscv: Fixup static_obj() fail") attempted to elide a lockdep
failure by rearranging our kernel image to place all initdata within [_stext,
_end], thus triggering lockdep to treat these as static objects.  These objects
are released and eventually reallocated, causing check_kernel_text_object() to
trigger a BUG().

This backs out the change to make [_stext, _end] all-encompassing, instead just
moving initdata.  This results in initdata being outside of [__init_begin,
__init_end], which means initdata can't be freed.

Link: https://lore.kernel.org/linux-riscv/1593266228-61125-1-git-send-email-guoren@kernel.org/T/#t
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Reported-by: Aurelien Jarno <aurelien@aurel32.net>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
[Palmer: Clean up commit text]
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Guo Ren 2020-10-06 16:49:33 +00:00 committed by Palmer Dabbelt
parent a78c6f5956
commit 84814460ee
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 3 additions and 2 deletions
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5
arch/riscv/kernel/vmlinux.lds.S
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@ -22,13 +22,11 @@ SECTIONS
/* Beginning of code and text segment */
. = LOAD_OFFSET;
_start = .;
_stext = .;
HEAD_TEXT_SECTION
. = ALIGN(PAGE_SIZE);
__init_begin = .;
INIT_TEXT_SECTION(PAGE_SIZE)
INIT_DATA_SECTION(16)
. = ALIGN(8);
__soc_early_init_table : {
__soc_early_init_table_start = .;
@ -55,6 +53,7 @@ SECTIONS
. = ALIGN(SECTION_ALIGN);
.text : {
_text = .;
_stext = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
@ -67,6 +66,8 @@ SECTIONS
_etext = .;
}
INIT_DATA_SECTION(16)
/* Start of data section */
_sdata = .;
RO_DATA(SECTION_ALIGN)