/* * 32-bit test to check vDSO mremap. * * Copyright (c) 2016 Dmitry Safonov * Suggested-by: Andrew Lutomirski * * This program is free software; you can redistribute it and/or modify * it under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ /* * Can be built statically: * gcc -Os -Wall -static -m32 test_mremap_vdso.c */ #define _GNU_SOURCE #include #include #include #include #include #include #include #include #define PAGE_SIZE 4096 static int try_to_remap(void *vdso_addr, unsigned long size) { void *dest_addr, *new_addr; /* Searching for memory location where to remap */ dest_addr = mmap(0, size, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); if (dest_addr == MAP_FAILED) { printf("[WARN]\tmmap failed (%d): %m\n", errno); return 0; } printf("[NOTE]\tMoving vDSO: [%p, %#lx] -> [%p, %#lx]\n", vdso_addr, (unsigned long)vdso_addr + size, dest_addr, (unsigned long)dest_addr + size); fflush(stdout); new_addr = mremap(vdso_addr, size, size, MREMAP_FIXED|MREMAP_MAYMOVE, dest_addr); if ((unsigned long)new_addr == (unsigned long)-1) { munmap(dest_addr, size); if (errno == EINVAL) { printf("[NOTE]\tvDSO partial move failed, will try with bigger size\n"); return -1; /* Retry with larger */ } printf("[FAIL]\tmremap failed (%d): %m\n", errno); return 1; } return 0; } int main(int argc, char **argv, char **envp) { pid_t child; child = fork(); if (child == -1) { printf("[WARN]\tfailed to fork (%d): %m\n", errno); return 1; } if (child == 0) { unsigned long vdso_size = PAGE_SIZE; unsigned long auxval; int ret = -1; auxval = getauxval(AT_SYSINFO_EHDR); printf("\tAT_SYSINFO_EHDR is %#lx\n", auxval); if (!auxval || auxval == -ENOENT) { printf("[WARN]\tgetauxval failed\n"); return 0; } /* Simpler than parsing ELF header */ while (ret < 0) { ret = try_to_remap((void *)auxval, vdso_size); vdso_size += PAGE_SIZE; } /* Glibc is likely to explode now - exit with raw syscall */ asm volatile ("int $0x80" : : "a" (__NR_exit), "b" (!!ret)); } else { int status; if (waitpid(child, &status, 0) != child || !WIFEXITED(status)) { printf("[FAIL]\tmremap() of the vDSO does not work on this kernel!\n"); return 1; } else if (WEXITSTATUS(status) != 0) { printf("[FAIL]\tChild failed with %d\n", WEXITSTATUS(status)); return 1; } printf("[OK]\n"); } return 0; } ext.git/commit/drivers?id=1bae6c99decf9137069646b593d3439171a8a8e2'>drivers/usb/serial/f81534.c
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authorDavid S. Miller <davem@davemloft.net>2017-01-30 22:05:52 -0500
committerDavid S. Miller <davem@davemloft.net>2017-01-30 22:05:52 -0500
commit1bae6c99decf9137069646b593d3439171a8a8e2 (patch)
tree431604a568cd2303973470de326bd9731370a025 /drivers/usb/serial/f81534.c
parent63c190429020a9701b42887ac22c28f287f1762f (diff)
parent2b2d3eb41c920b47df2fcedd1489cf748bd09466 (diff)
Merge branch 'sh_eth-E-DMAC-interrupt-mask-cleanups'
Sergei Shtylyov says: ==================== sh_eth: E-DMAC interrupt mask cleanups Here's a set of 3 patches against DaveM's 'net-next.git' repo. The main goal of this set is to stop using the bare numbers for the E-DMAC interrupt masks. [1/3] sh_eth: rename EESIPR bits [2/3] sh_eth: add missing EESIPR bits [3/3] sh_eth: stop using bare numbers for EESIPR values ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/usb/serial/f81534.c')