linux.git/arch/riscv/kernel, branch v5.12

riscv: keep interrupts disabled for BREAKPOINT exception

2021-04-16T04:32:40+00:00

Current riscv's kprobe handlers are run with both preemption and
interrupt enabled, this violates kprobe requirements. Fix this issue
by keeping interrupts disabled for BREAKPOINT exception.

Fixes: c22b0bcb1dd0 ("riscv: Add kprobes supported")
Cc: stable@vger.kernel.org
Signed-off-by: Jisheng Zhang 
Reviewed-by: Masami Hiramatsu 
[Palmer: add a comment]
Signed-off-by: Palmer Dabbelt

riscv: kprobes/ftrace: Add recursion protection to the ftrace callback

2021-04-16T04:32:34+00:00

Currently, the riscv's kprobes(powerred by ftrace) handler is
preemptible. Futher check indicates we miss something similar as the
commit c536aa1c5b17 ("kprobes/ftrace: Add recursion protection to the
ftrace callback"), so do similar modifications as the commit does.

Fixes: 829adda597fe ("riscv: Add KPROBES_ON_FTRACE supported")
Cc: stable@vger.kernel.org
Signed-off-by: Jisheng Zhang 
Reviewed-by: Steven Rostedt (VMware) 
Signed-off-by: Palmer Dabbelt

riscv: add do_page_fault and do_trap_break into the kprobes blacklist

2021-04-16T04:32:28+00:00

These two functions are used to implement the kprobes feature so they
can't be kprobed.

Fixes: c22b0bcb1dd0 ("riscv: Add kprobes supported")
Cc: stable@vger.kernel.org
Signed-off-by: Jisheng Zhang 
Reviewed-by: Masami Hiramatsu 
Signed-off-by: Palmer Dabbelt

riscv,entry: fix misaligned base for excp_vect_table

2021-04-02T04:37:05+00:00

In RV64, the size of each entry in excp_vect_table is 8 bytes. If the
base of the table is not 8-byte aligned, loading an entry in the table
will raise a misaligned exception. Although such exception will be
handled by opensbi/bbl, this still causes performance degradation.

Signed-off-by: Zihao Yu 
Reviewed-by: Anup Patel 
Signed-off-by: Palmer Dabbelt

riscv: Drop const annotation for sp

2021-04-02T04:37:03+00:00

The const annotation should not be used for 'sp', or it will
become read only and lead to bad stack output.

Fixes: dec822771b01 ("riscv: stacktrace: Move register keyword to beginning of declaration")
Signed-off-by: Kefeng Wang 
Signed-off-by: Palmer Dabbelt

RISC-V: Fix out-of-bounds accesses in init_resources()

2021-03-17T04:55:11+00:00

init_resources() allocates an array of resources, based on the current
total number of memory regions and reserved memory regions.  However,
allocating this array using memblock_alloc() might increase the number
of reserved memory regions.  If that happens, populating the array later
based on the new number of regions will cause out-of-bounds writes
beyond the end of the allocated array.

Fix this by allocating one more entry, which may or may not be used.

Fixes: 797f0375dd2ef5cd ("RISC-V: Do not allocate memblock while iterating reserved memblocks")
Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Atish Patra 
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt

ftrace: Fix spelling mistake "disabed" -> "disabled"

2021-03-17T04:19:40+00:00

There is a spelling mistake in a comment, fix it.

Signed-off-by: Colin Ian King 
Signed-off-by: Palmer Dabbelt

riscv: fix bugon.cocci warnings

2021-03-17T03:34:19+00:00

Use BUG_ON instead of a if condition followed by BUG.

Generated by: scripts/coccinelle/misc/bugon.cocci

Fixes: c22b0bcb1dd0 ("riscv: Add kprobes supported")
CC: Guo Ren 
Reported-by: kernel test robot 
Signed-off-by: kernel test robot 
Signed-off-by: Julia Lawall 
Reviewed-by: Pekka Enberg 
Signed-off-by: Palmer Dabbelt

riscv: ftrace: Use ftrace_get_regs helper

2021-03-10T04:46:06+00:00

Use ftrace_get_regs() helper call to get pt_regs from ftrace_regs struct,
this makes the code simpler.

Signed-off-by: Nanyong Sun 
Signed-off-by: Palmer Dabbelt

riscv: process: Fix no prototype for show_regs

2021-03-10T04:46:05+00:00

Include header file to fix the following W=1 compilation warning:
arch/riscv/kernel/process.c:78:6: warning: no previous prototype for ‘show_regs’ [-Wmissing-prototypes]
   78 | void show_regs(struct pt_regs *regs)
      |      ^~~~~~~~~

Reported-by: Hulk Robot 
Signed-off-by: Nanyong Sun 
Signed-off-by: Palmer Dabbelt