linux-stable.git/arch/powerpc/kernel/entry_32.S, branch linux-5.11.y

powerpc/32s: Add missing call to kuep_lock on syscall entry

2021-03-04T11:15:36+00:00

commit 57fdfbce89137ae85cd5cef48be168040a47dd13 upstream.

Userspace Execution protection and fast syscall entry were implemented
independently from each other and were both merged in kernel 5.2,
leading to syscall entry missing userspace execution protection.

On syscall entry, execution of user space memory must be
locked in the same way as on exception entry.

Fixes: b86fb88855ea ("powerpc/32: implement fast entry for syscalls on non BOOKE")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/c65e105b63aaf74f91a14f845bc77192350b84a6.1612796617.git.christophe.leroy@csgroup.eu
Signed-off-by: Greg Kroah-Hartman

powerpc/fault: Perform exception fixup in do_page_fault()

2020-12-09T12:48:14+00:00

Exception fixup doesn't require the heady full regs saving,
do it from do_page_fault() directly.

For that, split bad_page_fault() in two parts.

As bad_page_fault() can also be called from other places than
handle_page_fault(), it will still perform exception fixup and
fallback on __bad_page_fault().

handle_page_fault() directly calls __bad_page_fault() as the
exception fixup will now be done by do_page_fault()

Signed-off-by: Christophe Leroy 
Reviewed-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/bd07d6fef9237614cd6d318d8f19faeeadaa816b.1607491748.git.christophe.leroy@csgroup.eu

powerpc/44x: Don't support 47x code and non 47x code at the same time

2020-12-03T14:01:34+00:00

440/460 variants and 470 variants are not compatible, no
need to make code supporting both and using MMU features.

Just use CONFIG_PPC_47x to decide what to build.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/c3e64da3d5d068c69a201e03bbae7da055761e5b.1603041883.git.christophe.leroy@csgroup.eu

powerpc: Remove RFI macro

2020-11-19T05:56:55+00:00

RFI macro is just there to add an infinite loop past
rfi in order to avoid prefetch on 40x in half a dozen
of places in entry_32 and head_32.

Those places are already full of #ifdefs, so just add a
few more to explicitely show those loops and remove RFI.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/f7e9cb9e9240feec63cb330abf40b67d1aad852f.1604854583.git.christophe.leroy@csgroup.eu

powerpc: Replace RFI by rfi on book3s/32 and booke

2020-11-19T05:56:54+00:00

For book3s/32 and for booke, RFI is just an rfi.
Only 40x has a non trivial RFI.
CONFIG_PPC_RTAS is never selected by 40x platforms.

Make it more explicit by replacing RFI by rfi wherever possible.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/b901ddfdeb8a0a3b7cb59999599cdfde1bbfe834.1604854583.git.christophe.leroy@csgroup.eu

powerpc: Remove support for PowerPC 601

2020-10-08T10:17:13+00:00

PowerPC 601 has been retired.

Remove all associated specific code.

CPU_FTRS_PPC601 has CPU_FTR_COHERENT_ICACHE and CPU_FTR_COMMON.

CPU_FTR_COMMON is already present via other CPU_FTRS.
None of the remaining CPU selects CPU_FTR_COHERENT_ICACHE.

So CPU_FTRS_PPC601 can be removed from the possible features,
hence can be removed completely.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/60b725d55e21beec3335175c20b77903ff98284f.1601362098.git.christophe.leroy@csgroup.eu

powerpc: Drop SYNC_601() ISYNC_601() and SYNC()

2020-10-08T10:17:13+00:00

Those macros are now empty at all time. Drop them.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/7990bb63fc53e460bfa94f8040184881d9e6fbc3.1601362098.git.christophe.leroy@csgroup.eu

powerpc: Select ARCH_HAS_MEMBARRIER_SYNC_CORE

2020-07-23T07:43:23+00:00

powerpc return from interrupt and return from system call sequences
are context synchronising.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20200716013522.338318-1-npiggin@gmail.com

powerpc/entry32: Blacklist exception exit points for kprobe.

2020-06-02T10:59:13+00:00

kprobe does not handle events happening in real mode.

The very last part of exception exits cannot support a trap.
Blacklist them from kprobe.

While we are at it, remove exc_exit_start symbol which is not
used to avoid having to blacklist it.

Signed-off-by: Christophe Leroy 
Acked-by: Naveen N. Rao 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/098b0fd3f6299aa1bd692bd576bd7012c84608de.1585670437.git.christophe.leroy@c-s.fr

powerpc/entry32: Blacklist syscall exit points for kprobe.

2020-06-02T10:59:12+00:00

kprobe does not handle events happening in real mode.

The very last part of syscall cannot support a trap.
Add a symbol syscall_exit_finish to identify that part and
blacklist it from kprobe.

Signed-off-by: Christophe Leroy 
Acked-by: Naveen N. Rao 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/23eddf49abb03d1359fa0be4206998eb3800f42c.1585670437.git.christophe.leroy@c-s.fr