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authorDavid Abdurachmanov <david.abdurachmanov@gmail.com>2019-12-18 10:47:56 +0200
committerPaul Walmsley <paul.walmsley@sifive.com>2019-12-27 21:50:57 -0800
commit556f47ac6083d778843e89aa21b1242eee2693ed (patch)
tree7d15925f22c0625e9fd3e0c60f74c0e812f519ab /arch
parent4d47ce158efb7b145c680e79cd33e3c6fd773de4 (diff)
downloadlinux-556f47ac6083d778843e89aa21b1242eee2693ed.tar.gz
riscv: reject invalid syscalls below -1
Running "stress-ng --enosys 4 -t 20 -v" showed a large number of kernel oops with "Unable to handle kernel paging request at virtual address" message. This happens when enosys stressor starts testing random non-valid syscalls. I forgot to redirect any syscall below -1 to sys_ni_syscall. With the patch kernel oops messages are gone while running stress-ng enosys stressor. Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com> Fixes: 5340627e3fe0 ("riscv: add support for SECCOMP and SECCOMP_FILTER") Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/riscv/kernel/entry.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index a1349ca64669..e163b7b64c86 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -246,6 +246,7 @@ check_syscall_nr:
*/
li t1, -1
beq a7, t1, ret_from_syscall_rejected
+ blt a7, t1, 1f
/* Call syscall */
la s0, sys_call_table
slli t0, a7, RISCV_LGPTR