Messages in this thread Patch in this message | | | From | Li zeming <> | Subject | [PATCH] lkdtm: perms: Increase pointer assignment check | Date | Sat, 18 Feb 2023 02:58:01 +0800 |
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Increase the check after the pointer allocates memory. If these two functions are used, at least increase some robustness.
Signed-off-by: Li zeming <zeming@nfschina.com> --- drivers/misc/lkdtm/perms.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/misc/lkdtm/perms.c b/drivers/misc/lkdtm/perms.c index b93404d65650..a5d8dce5ce49 100644 --- a/drivers/misc/lkdtm/perms.c +++ b/drivers/misc/lkdtm/perms.c @@ -180,15 +180,19 @@ static void lkdtm_EXEC_STACK(void) static void lkdtm_EXEC_KMALLOC(void) { u32 *kmalloc_area = kmalloc(EXEC_SIZE, GFP_KERNEL); - execute_location(kmalloc_area, CODE_WRITE); - kfree(kmalloc_area); + if (kmalloc_area) { + execute_location(kmalloc_area, CODE_WRITE); + kfree(kmalloc_area); + } } static void lkdtm_EXEC_VMALLOC(void) { u32 *vmalloc_area = vmalloc(EXEC_SIZE); - execute_location(vmalloc_area, CODE_WRITE); - vfree(vmalloc_area); + if (vmalloc_area) { + execute_location(vmalloc_area, CODE_WRITE); + vfree(vmalloc_area); + } } static void lkdtm_EXEC_RODATA(void) -- 2.18.2
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