diff options
| author | Andrew Jones <ajones@ventanamicro.com> | 2023-10-10 18:51:02 +0200 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-11-02 14:05:30 -0700 |
| commit | e1c05b3bf80f829ced464bdca90f1dfa96e8d251 (patch) | |
| tree | 6b08f6ae1397c02d9008c83458622caabeba8adb /arch/riscv/include/asm/hwprobe.h | |
| parent | 653301077c1f3e18af33f7950014cda8b4bf4935 (diff) | |
RISC-V: hwprobe: Fix vDSO SIGSEGV
A hwprobe pair key is signed, but the hwprobe vDSO function was
only checking that the upper bound was valid. In order to help
avoid this type of problem in the future, and in anticipation of
this check becoming more complicated with sparse keys, introduce
and use a "key is valid" predicate function for the check.
Fixes: aa5af0aa90ba ("RISC-V: Add hwprobe vDSO function and data")
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Link: https://lore.kernel.org/r/20231010165101.14942-2-ajones@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/include/asm/hwprobe.h')
| -rw-r--r-- | arch/riscv/include/asm/hwprobe.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/hwprobe.h b/arch/riscv/include/asm/hwprobe.h index 39df8604fea1..5c48f48e79a6 100644 --- a/arch/riscv/include/asm/hwprobe.h +++ b/arch/riscv/include/asm/hwprobe.h @@ -10,4 +10,9 @@ #define RISCV_HWPROBE_MAX_KEY 6 +static inline bool riscv_hwprobe_key_is_valid(__s64 key) +{ + return key >= 0 && key <= RISCV_HWPROBE_MAX_KEY; +} + #endif |