AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-24 06:40:54 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

A single bugfix for the ORC unwinder to ensure that the error flag which

Browse Source 
tells the unwinding code whether a stack trace can be trusted or not is
 always set correctly. This was messed up by a couple of changes in the
 recent past.
 -----BEGIN PGP SIGNATURE-----
 
 iQJHBAABCgAxFiEEQp8+kY+LLUocC4bMphj1TA10mKEFAl7BC+gTHHRnbHhAbGlu
 dXRyb25peC5kZQAKCRCmGPVMDXSYoWFBEACR8MiO0VM2XXNsejd7rttgs/eoC4/M
 IKM5K1hq4eRCTodwVnkWwLk6p0asAMKhzpWQ3MS5RJBNAYxLbbxnsYSGtd8zIsdV
 wk6jbNYeT2MUZq2tYkjn3b9B6+91FFMZq6q+KDOfNPqcKZyP4n5o5QSewznBvQwt
 dHvjGgegJDjrrtuhLSQKG/uvSSi2hN9S5ibSMCa004GnH6P+uk/eICpvUXwNCyjV
 ygogYTmQQqAEqnlqVNdQxo+DFYbaxKCw12VSoBeOsEySljPdc136hP/j7Tzbf2em
 rkqtyXwng1+yG0vozMCAkyP5l3uA+HUculQLdmO8/55eia5Dl/zgsp3SvW7/2ONS
 0DRfGo0ghoZgId1oDu6DGPsX80wKKskerJpTN/tHWTXQWeUXCNXrX//lhrFiwd7P
 mHiyuk+INw3LQBkTlf7XhAf28w/9/+gCm3prEGnUCmLaJOeZ8HtL0mwDzudgc9Ca
 NW/b3tdt4JU3oXKyyqywr4XAYfxlfmyf3DrBMnuHdTgccaB9PAAzugjmDnFJOuzk
 jQw/Qfd6w7ZgVcVoaNQjjeogMTryGthCOPe9DzPUgkr+jCDsMwXopCvxbhbWI9e5
 L1/U5ilka/VC2ZP7qZUvwsltCgp6RamhDb3yLZbn/2PKf0sFKVoI/j/g1qMnLNZt
 TBNjzYuWAC8Hlw==
 =4kDr
 -----END PGP SIGNATURE-----

Merge tag 'objtool-urgent-2020-05-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 stack unwinding fix from Thomas Gleixner:
 "A single bugfix for the ORC unwinder to ensure that the error flag
  which tells the unwinding code whether a stack trace can be trusted or
  not is always set correctly.

  This was messed up by a couple of changes in the recent past"

* tag 'objtool-urgent-2020-05-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/unwind/orc: Fix error handling in __unwind_start()
This commit is contained in:
Linus Torvalds 2020-05-17 12:20:14 -07:00
commit ef0d5b9102
1 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
arch/x86/kernel/unwind_orc.c
View File

@ -617,23 +617,23 @@ EXPORT_SYMBOL_GPL(unwind_next_frame);
void __unwind_start(struct unwind_state *state, struct task_struct *task,
struct pt_regs *regs, unsigned long *first_frame)
{
if (!orc_init)
goto done;
memset(state, 0, sizeof(*state));
state->task = task;
if (!orc_init)
goto err;
/*
* Refuse to unwind the stack of a task while it's executing on another
* CPU. This check is racy, but that's ok: the unwinder has other
* checks to prevent it from going off the rails.
*/
if (task_on_another_cpu(task))
goto done;
goto err;
if (regs) {
if (user_mode(regs))
goto done;
goto the_end;
state->ip = regs->ip;
state->sp = regs->sp;
@ -666,6 +666,7 @@ void __unwind_start(struct unwind_state *state, struct task_struct *task,
* generate some kind of backtrace if this happens.
*/
void *next_page = (void *)PAGE_ALIGN((unsigned long)state->sp);
state->error = true;
if (get_stack_info(next_page, state->task, &state->stack_info,
&state->stack_mask))
return;
@ -691,8 +692,9 @@ void __unwind_start(struct unwind_state *state, struct task_struct *task,
return;
done:
err:
state->error = true;
the_end:
state->stack_info.type = STACK_TYPE_UNKNOWN;
return;
}
EXPORT_SYMBOL_GPL(__unwind_start);