kdump-lib: Harden _crashkernel_add
Resolves: https://issues.redhat.com/browse/RHEL-8727 Resolves: https://issues.redhat.com/browse/RHEL-8710 Upstream: Fedora Conflict: spec/kdump-lib_spec.sh doesn't exist in RHEL, so I remove the hunk directly. commit 64f2827a4bfa3f26974972f2f5a4477eec58f221 Author: Philipp Rudo <prudo@redhat.com> Date: Wed Sep 6 10:49:47 2023 +0200 kdump-lib: Harden _crashkernel_add _crashkernel_add currently always assumes the good case, i.e. that the value of the crashkernel parameter has the correct syntax and that the delta added is a number. Both doesn't have to be true when the values are provided by users. Thus add some additional checks. Furthermore require the delta to have a explicit unit, i.e. no longer assume that is in megabytes, i.e. 100 -> 100M. Signed-off-by: Philipp Rudo <prudo@redhat.com> Reviewed-by: Pingfan Liu <piliu@redhat.com> Signed-off-by: Baoquan He <bhe@redhat.com>
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Baoquan He
parent
0094f46c37
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0778b6add9
155
kdump-lib.sh
155
kdump-lib.sh
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@ -993,62 +993,125 @@ has_aarch64_smmu()
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ls /sys/devices/platform/arm-smmu-* 1> /dev/null 2>&1
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}
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# $1 crashkernel=""
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# $2 delta in unit of MB
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_crashkernel_add()
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is_memsize() { [[ "$1" =~ ^[+-]?[0-9]+[KkMmGg]?$ ]]; }
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# range defined for crashkernel parameter
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# i.e. <start>-[<end>]
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is_memrange()
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{
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local _ck _add _entry _ret
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local _range _size _offset
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is_memsize "${1%-*}" || return 1
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[[ -n ${1#*-} ]] || return 0
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is_memsize "${1#*-}"
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}
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_ck="$1"
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_add="$2"
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_ret=""
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to_bytes()
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{
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local _s
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if [[ "$_ck" == *@* ]]; then
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_offset="@${_ck##*@}"
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_ck=${_ck%@*}
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elif [[ "$_ck" == *,high ]] || [[ "$_ck" == *,low ]]; then
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_offset=",${_ck##*,}"
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_ck=${_ck%,*}
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_s="$1"
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is_memsize "$_s" || return 1
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case "${_s: -1}" in
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K|k)
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_s=${_s::-1}
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_s="$((_s * 1024))"
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;;
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M|m)
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_s=${_s::-1}
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_s="$((_s * 1024 * 1024))"
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;;
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G|g)
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_s=${_s::-1}
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_s="$((_s * 1024 * 1024 * 1024))"
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;;
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*)
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;;
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esac
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echo "$_s"
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}
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memsize_add()
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{
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local -a units=("" "K" "M" "G")
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local i a b
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a=$(to_bytes "$1") || return 1
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b=$(to_bytes "$2") || return 1
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i=0
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(( a += b ))
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while :; do
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[[ $(( a / 1024 )) -eq 0 ]] && break
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[[ $(( a % 1024 )) -ne 0 ]] && break
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[[ $(( ${#units[@]} - 1 )) -eq $i ]] && break
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(( a /= 1024 ))
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(( i += 1 ))
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done
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echo "${a}${units[$i]}"
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}
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_crashkernel_parse()
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{
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local ck entry
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local range size offset
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ck="$1"
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if [[ "$ck" == *@* ]]; then
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offset="@${ck##*@}"
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ck=${ck%@*}
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elif [[ "$ck" == *,high ]] || [[ "$ck" == *,low ]]; then
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offset=",${ck##*,}"
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ck=${ck%,*}
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else
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_offset=''
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offset=''
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fi
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while read -d , -r _entry; do
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[[ -n "$_entry" ]] || continue
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if [[ "$_entry" == *:* ]]; then
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_range=${_entry%:*}
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_size=${_entry#*:}
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while read -d , -r entry; do
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[[ -n "$entry" ]] || continue
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if [[ "$entry" == *:* ]]; then
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range=${entry%:*}
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size=${entry#*:}
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else
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_range=""
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_size=${_entry}
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range=""
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size=${entry}
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fi
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case "${_size: -1}" in
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K)
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_size=${_size::-1}
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_size="$((_size + (_add * 1024)))K"
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;;
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M)
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_size=${_size::-1}
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_size="$((_size + _add))M"
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;;
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G)
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_size=${_size::-1}
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_size="$((_size * 1024 + _add))M"
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;;
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*)
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_size="$((_size + (_add * 1024 * 1024)))"
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;;
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esac
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echo "$size;$range;"
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done <<< "$ck,"
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echo ";;$offset"
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}
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[[ -n "$_range" ]] && _ret+="$_range:"
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_ret+="$_size,"
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done <<< "$_ck,"
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# $1 crashkernel command line parameter
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# $2 size to be added
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_crashkernel_add()
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{
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local ck delta ret
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local range size offset
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_ret=${_ret%,}
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[[ -n "$_offset" ]] && _ret+=$_offset
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echo "$_ret"
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ck="$1"
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delta="$2"
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ret=""
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while IFS=';' read -r size range offset; do
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if [[ -n "$offset" ]]; then
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ret="${ret%,}$offset"
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break
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fi
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[[ -n "$size" ]] || continue
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if [[ -n "$range" ]]; then
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is_memrange "$range" || return 1
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ret+="$range:"
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fi
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size=$(memsize_add "$size" "$delta") || return 1
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ret+="$size,"
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done < <( _crashkernel_parse "$ck")
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echo "${ret%,}"
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}
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# get default crashkernel
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@ -1098,7 +1161,7 @@ kdump_get_arch_recommend_crashkernel()
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#4k kernel, mlx5 consumes extra 124M memory, and choose 150M
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has_mlx5 && ((_delta += 150))
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fi
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_ck_cmdline=$(_crashkernel_add "$_ck_cmdline" "$_delta")
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_ck_cmdline=$(_crashkernel_add "$_ck_cmdline" "${_delta}M")
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elif [[ $_arch == "ppc64le" ]]; then
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if [[ $_dump_mode == "fadump" ]]; then
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_ck_cmdline="4G-16G:768M,16G-64G:1G,64G-128G:2G,128G-1T:4G,1T-2T:6G,2T-4T:12G,4T-8T:20G,8T-16T:36G,16T-32T:64G,32T-64T:128G,64T-:180G"
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