diff options
| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2020-11-29 21:46:05 +0100 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2020-11-29 21:46:05 +0100 |
| commit | b5a5e5c3f8cbbb68ea7c3d94c297eafe8be40c9a (patch) | |
| tree | 980a2cd3e0c98498922a4cad3e86f6ef2ec41592 | |
| parent | 7f61298b5d4c36b38e3c9e96fd0357c564bc3b9d (diff) | |
x86: Make sure we allocate as much as our structure should hold
* i386/i386/fpu.c (init_fpu): Panic if the CPU gives us a size that is
smaller than it should.
| -rw-r--r-- | i386/i386/fpu.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/i386/i386/fpu.c b/i386/i386/fpu.c index 69c495c8..c5401fca 100644 --- a/i386/i386/fpu.c +++ b/i386/i386/fpu.c @@ -185,6 +185,11 @@ init_fpu(void) cpuid(eax, ebx, ecx, edx); if (eax & CPU_FEATURE_XSAVES) { fp_xsave_size = offsetof(struct i386_fpsave_state, xfp_save_state) + ebx; + if (fp_xsave_size < sizeof(struct i386_fpsave_state)) + panic("CPU-provided xstate size %d " + "is smaller than our minimum %d!\n", + fp_xsave_size, + sizeof(struct i386_fpsave_state)); fp_save_kind = FP_XSAVES; } else { @@ -192,6 +197,11 @@ init_fpu(void) ecx = 0x0; cpuid(eax, ebx, ecx, edx); fp_xsave_size = offsetof(struct i386_fpsave_state, xfp_save_state) + ebx; + if(fp_xsave_size < sizeof(struct i386_fpsave_state)); + panic("CPU-provided xstate size %d " + "is smaller than our minimum %d!\n", + fp_xsave_size, + sizeof(struct i386_fpsave_state)); if (eax & CPU_FEATURE_XSAVEOPT) fp_save_kind = FP_XSAVEOPT; |