In the Linux kernel, the following vulnerability has been resolved: x86/kexec: fix memory leak of elf header buffer This is reported by kmemleak detector: unreferenced object 0xffffc900002a9000 (size 4096): comm "kexec", pid 14950, jiffies 4295110793 (age 373.951s) hex dump (first 32 bytes): 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 .ELF............ 04 00 3e 00 01 00 00 00 00 00 00 00 00 00 00 00 ..>............. backtrace: [<0000000016a8ef9f>] _vmallocnoderange+0x101/0x170 [<000000002b66b6c0>] _vmallocnode+0xb4/0x160 [<00000000ad40107d>] crashprepareelf64headers+0x8e/0xcd0 [<0000000019afff23>] crashloadsegments+0x260/0x470 [<0000000019ebe95c>] bzImage64load+0x814/0xad0 [<0000000093e16b05>] archkexeckernelimageload+0x1be/0x2a0 [<000000009ef2fc88>] kimagefileallocinit+0x2ec/0x5a0 [<0000000038f5a97a>] _dosyskexecfileload+0x28d/0x530 [<0000000087c19992>] dosyscall64+0x3b/0x90 [<0000000066e063a4>] entrySYSCALL64afterhwframe+0x44/0xae In crashprepareelf64headers(), a buffer is allocated via vmalloc() to store elf headers. While it's not freed back to system correctly when kdump kernel is reloaded or unloaded. Then memory leak is caused. Fix it by introducing x86 specific function archkimagefilepostloadcleanup(), and freeing the buffer there. And also remove the incorrect elf header buffer freeing code. Before calling arch specific kexecfile loading function, the image instance has been initialized. So 'image->elfheaders' must be NULL. It doesn't make sense to free the elf header buffer in the place. Three different people have reported three bugs about the memory leak on x8664 inside Redhat.
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