#!/bin/sh # This validates that the kernel will fall back to using the user helper # to load firmware it can't find on disk itself. We must request a firmware # that the kernel won't find, and any installed helper (e.g. udev) also # won't find so that we can do the load ourself manually. set -e modprobe test_firmware DIR=/sys/devices/virtual/misc/test_firmware # CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/ # These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that # as an indicator for CONFIG_FW_LOADER_USER_HELPER. HAS_FW_LOADER_USER_HELPER=$(if [ -d /sys/class/firmware/ ]; then echo yes; else echo no; fi) if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then OLD_TIMEOUT=$(cat /sys/class/firmware/timeout) else echo "usermode helper disabled so ignoring test" exit 0 fi FWPATH=$(mktemp -d) FW="$FWPATH/test-firmware.bin" test_finish() { echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout rm -f "$FW" rmdir "$FWPATH" } load_fw() { local name="$1" local file="$2" # This will block until our load (below) has finished. echo -n "$name" >"$DIR"/trigger_request & # Give kernel a chance to react. local timeout=10 while [ ! -e "$DIR"/"$name"/loading ]; do sleep 0.1 timeout=$(( $timeout - 1 )) if [ "$timeout" -eq 0 ]; then echo "$0: firmware interface never appeared" >&2 exit 1 fi done echo 1 >"$DIR"/"$name"/loading cat "$file" >"$DIR"/"$name"/data echo 0 >"$DIR"/"$name"/loading # Wait for request to finish. wait } trap "test_finish" EXIT # This is an unlikely real-world firmware content. :) echo "ABCD0123" >"$FW" NAME=$(basename "$FW") # Test failure when doing nothing (timeout works). echo 1 >/sys/class/firmware/timeout echo -n "$NAME" >"$DIR"/trigger_request if diff -q "$FW" /dev/test_firmware >/dev/null ; then echo "$0: firmware was not expected to match" >&2 exit 1 else echo "$0: timeout works" fi # Put timeout high enough for us to do work but not so long that failures # slow down this test too much. echo 4 >/sys/class/firmware/timeout # Load this script instead of the desired firmware. load_fw "$NAME" "$0" if diff -q "$FW" /dev/test_firmware >/dev/null ; then echo "$0: firmware was not expected to match" >&2 exit 1 else echo "$0: firmware comparison works" fi # Do a proper load, which should work correctly. load_fw "$NAME" "$FW" if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then echo "$0: firmware was not loaded" >&2 exit 1 else echo "$0: user helper firmware loading works" fi exit 0 ols/objtool/Documentation/stack-validation.txt'>
path: root/tools/objtool/Documentation/stack-validation.txt
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authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-24 16:54:39 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-24 16:54:39 -0800
commit883af14e67e8b8702b5560aa64c888c0cd0bd66c (patch)
tree74e3a6b53f5fad9f7848ab1b9f6921b7012940a4 /tools/objtool/Documentation/stack-validation.txt
parent0263d4ebd94b36280608e296cba39b924b6e832b (diff)
parentaab45453ff5c77200c6da4ac909f7a4392aed17e (diff)
Merge branch 'akpm' (patches from Andrew)
Merge fixes from Andrew Morton: "26 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (26 commits) MAINTAINERS: add Dan Streetman to zbud maintainers MAINTAINERS: add Dan Streetman to zswap maintainers mm: do not export ioremap_page_range symbol for external module mn10300: fix build error of missing fpu_save() romfs: use different way to generate fsid for BLOCK or MTD frv: add missing atomic64 operations mm, page_alloc: fix premature OOM when racing with cpuset mems update mm, page_alloc: move cpuset seqcount checking to slowpath mm, page_alloc: fix fast-path race with cpuset update or removal mm, page_alloc: fix check for NULL preferred_zone kernel/panic.c: add missing \n fbdev: color map copying bounds checking frv: add atomic64_add_unless() mm/mempolicy.c: do not put mempolicy before using its nodemask radix-tree: fix private list warnings Documentation/filesystems/proc.txt: add VmPin mm, memcg: do not retry precharge charges proc: add a schedule point in proc_pid_readdir() mm: alloc_contig: re-allow CMA to compact FS pages mm/slub.c: trace free objects at KERN_INFO ...
Diffstat (limited to 'tools/objtool/Documentation/stack-validation.txt')