Le 21/02/2022 à 09:15, Christophe Leroy a écrit :
Le 18/02/2022 à 22:25, Aaron Tomlin a écrit :
No functional change.
This patch migrates kallsyms code out of core module
code kernel/module/kallsyms.c
Signed-off-by: Aaron Tomlin <atomlin@xxxxxxxxxx>
With this patch I get an Oops:
[ 36.421711] BUG: Unable to handle kernel data access on write at
0xbe79bb40
[ 36.428435] Faulting instruction address: 0xc008b74c
[ 36.433342] Oops: Kernel access of bad area, sig: 11 [#1]
[ 36.438672] BE PAGE_SIZE=16K PREEMPT CMPC885
[ 36.442947] SAF3000 DIE NOTIFICATION
[ 36.446421] Modules linked in:
[ 36.449436] CPU: 0 PID: 374 Comm: insmod Not tainted
5.17.0-rc4-s3k-dev-02274-g7d4ec8831803 #1016
[ 36.458211] NIP: c008b74c LR: c00897ac CTR: c001145c
[ 36.463200] REGS: caf8bcf0 TRAP: 0300 Not tainted
(5.17.0-rc4-s3k-dev-02274-g7d4ec8831803)
[ 36.471633] MSR: 00009032 <EE,ME,IR,DR,RI> CR: 24002842 XER: 00000000
[ 36.478261] DAR: be79bb40 DSISR: c2000000
[ 36.478261] GPR00: c00899a0 caf8bdb0 c230a980 be74c000 caf8beb8
00000008 00000000 c035629c
[ 36.478261] GPR08: be75c000 caf9c9fc be79bb40 00000004 24002842
100d166a 00000290 00000000
[ 36.478261] GPR16: c0747320 caf9c9fc c11ff918 caf9b2a7 be75c290
00000550 00000022 c0747210
[ 36.478261] GPR24: c11ff8e8 be74c000 c11ff8fc 100b8820 00000000
00000000 be74c000 caf8beb8
[ 36.516729] NIP [c008b74c] add_kallsyms+0x48/0x30c
[ 36.521465] LR [c00897ac] load_module+0x16f8/0x2504
Fixup:
diff --git a/kernel/module/kallsyms.c b/kernel/module/kallsyms.c
index 6c8f1f390cf5..2ee8d2e67068 100644
--- a/kernel/module/kallsyms.c
+++ b/kernel/module/kallsyms.c
@@ -171,8 +171,7 @@ void add_kallsyms(struct module *mod, const struct
load_info *info)
Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
/* Set up to point into init section. */
- mod->kallsyms = (struct mod_kallsyms __rcu *)mod->init_layout.base +
- info->mod_kallsyms_init_off;
+ mod->kallsyms = (void __rcu *)mod->init_layout.base +
info->mod_kallsyms_init_off;
/* The following is safe since this pointer cannot change */
rcu_dereference_sched(mod->kallsyms)->symtab = (void *)symsec->sh_addr;
Christophe