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find-provides.ksyms, find-requires.ksyms: rewrite section data matching 

Currently, it just matches the 2nd to 5th fields with awk, which leads
to occasional capturing of some garbage at the end of the section data
and minor issues when supplying it to the symbol extracting awk script:

    awk: cmd. line:1: (FILENAME=- FNR=19) fatal: argument index with `$' must be > 0
    awk: warning: escape sequence `\.' treated as plain `.'
    awk: cmd. line:1: (FILENAME=- FNR=9) fatal: not enough arguments to satisfy format string
    	`78b624dbc125415351be965ex.$..%ASQ..^'
    	                              ^ ran out for this one

While at it, also eliminate grep and sed calls (with the pair of awk and
sed being the most offending).

* find-provides.ksyms: Generate part of the awk script that performs
the byte reversal based on the endianness in the readelf -h output,
inject it into the awk script;  use substr for matching parts
of the section data instead of fields.
* find-requires.ksyms (all_provides): Likewise.

Resolves: #2115811
Resolves: #2178935
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
This commit is contained in:
Eugene Syromiatnikov 2023-05-17 14:01:55 +02:00
parent a553de1c74
commit f40a274ef8
2 changed files with 10 additions and 12 deletions
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11
find-provides.ksyms
View File

@ -51,12 +51,11 @@ for module in $(grep -E '/lib/modules/.+\.ko(\.gz|\.bz2|\.xz|\.zst)?$') "$@"; do
| while read -r sectname; do
[ -n "$sectname" ] || continue
ELFSECTDATA=$(readelf -R "$sectname" "$module" | awk '/0x/{printf $2$3$4$5}')
if [[ -n $(readelf -h $module | grep "little endian") ]]; then
SECTDATA=$(echo $ELFSECTDATA | sed 's/\(..\)\(..\)\(..\)\(..\)/\4\3\2\1/g')
else
SECTDATA=$ELFSECTDATA
fi
revbytes=""
kmod_elf_hdr="$(readelf -h "$module")"
[ "x$kmod_elf_hdr" = "x${kmod_elf_hdr%Data:*little endian*}" ] ||
revbytes='a = gensub(/(..)(..)(..)(..)/, "\\4\\3\\2\\1", "g", a);'
SECTDATA=$(readelf -R "$sectname" "$module" | awk '/^ 0x[0-9a-f]{8}/{ a = substr($0, 14, 8) substr($0, 23, 8) substr($0, 32, 8) substr($0, 41, 8); '"$revbytes"' printf("%s", a); }')
objdump -t "$module" \
| awk \

11
find-requires.ksyms
View File

@ -53,12 +53,11 @@ all_provides() {
| while read -r sectname; do
[ -n "$sectname" ] || continue
ELFSECTDATA=$(readelf -R "$sectname" "$module" | awk '/0x/{printf $2$3$4$5}')
if [[ -n $(readelf -h "$module" | grep "little endian") ]]; then
SECTDATA=$(echo $ELFSECTDATA | sed 's/\(..\)\(..\)\(..\)\(..\)/\4\3\2\1/g')
else
SECTDATA=$ELFSECTDATA
fi
revbytes=""
kmod_elf_hdr="$(readelf -h "$module")"
[ "x$kmod_elf_hdr" = "x${kmod_elf_hdr%Data:*little endian*}" ] ||
revbytes='a = gensub(/(..)(..)(..)(..)/, "\\4\\3\\2\\1", "g", a);'
SECTDATA=$(readelf -R "$sectname" "$module" | awk '/^ 0x[0-9a-f]{8}/{ a = substr($0, 14, 8) substr($0, 23, 8) substr($0, 32, 8) substr($0, 41, 8); '"$revbytes"' printf("%s", a); }')
objdump -t "$module" \
| awk \