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| author | Andreas Kling <kling@serenityos.org> | 2020-02-01 10:36:25 +0100 |
|---|---|---|
| committer | Andreas Kling <kling@serenityos.org> | 2020-02-01 10:56:17 +0100 |
| commit | 37d336d7414f0c29fdcdddebd45882c53eaf51d1 (patch) | |
| tree | ff3c4c0aba1b96e80e3128eb551bca7f44106917 /Kernel/Arch/i386 | |
| parent | 934b1d8a9ba9d86f9540cc15f881d67e705f27bd (diff) | |
| download | serenity-37d336d7414f0c29fdcdddebd45882c53eaf51d1.zip | |
Kernel: Add memory scrubbing in slab_alloc() and slab_dealloc()
These now scrub allocated and freed memory like kmalloc()/kfree() was
already doing.
Diffstat (limited to 'Kernel/Arch/i386')
| -rw-r--r-- | Kernel/Arch/i386/CPU.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Kernel/Arch/i386/CPU.cpp b/Kernel/Arch/i386/CPU.cpp index 52082ecc3d..a105550394 100644 --- a/Kernel/Arch/i386/CPU.cpp +++ b/Kernel/Arch/i386/CPU.cpp @@ -319,6 +319,8 @@ void page_fault_handler(RegisterDump regs) u32 free_scrub_pattern = explode_byte(FREE_SCRUB_BYTE); u32 kmalloc_scrub_pattern = explode_byte(KMALLOC_SCRUB_BYTE); u32 kfree_scrub_pattern = explode_byte(KFREE_SCRUB_BYTE); + u32 slab_alloc_scrub_pattern = explode_byte(SLAB_ALLOC_SCRUB_BYTE); + u32 slab_dealloc_scrub_pattern = explode_byte(SLAB_DEALLOC_SCRUB_BYTE); if ((fault_address & 0xffff0000) == (malloc_scrub_pattern & 0xffff0000)) { kprintf("\033[33;1mNote: Address %p looks like it may be uninitialized malloc() memory\033[0m\n", fault_address); } else if ((fault_address & 0xffff0000) == (free_scrub_pattern & 0xffff0000)) { @@ -327,6 +329,10 @@ void page_fault_handler(RegisterDump regs) kprintf("\033[33;1mNote: Address %p looks like it may be uninitialized kmalloc() memory\033[0m\n", fault_address); } else if ((fault_address & 0xffff0000) == (kfree_scrub_pattern & 0xffff0000)) { kprintf("\033[33;1mNote: Address %p looks like it may be recently kfree()'d memory\033[0m\n", fault_address); + } else if ((fault_address & 0xffff0000) == (slab_alloc_scrub_pattern & 0xffff0000)) { + kprintf("\033[33;1mNote: Address %p looks like it may be uninitialized slab_alloc() memory\033[0m\n", fault_address); + } else if ((fault_address & 0xffff0000) == (slab_dealloc_scrub_pattern & 0xffff0000)) { + kprintf("\033[33;1mNote: Address %p looks like it may be recently slab_dealloc()'d memory\033[0m\n", fault_address); } else if (fault_address < 4096) { kprintf("\033[33;1mNote: Address %p looks like a possible nullptr dereference\033[0m\n", fault_address); } |