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use-of-uninitialized values in print-esp.c #849

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fxlb opened this issue Apr 22, 2020 · 1 comment
Open

use-of-uninitialized values in print-esp.c #849

fxlb opened this issue Apr 22, 2020 · 1 comment

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@fxlb
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fxlb commented Apr 22, 2020

Need to fix print-esp.c. Test case:

$ CC=clang CFLAGS='-fno-omit-frame-pointer -fsanitize=memory -fno-optimize-sibling-calls -fPIC -g3 -ggdb3 -O0' ./configure

$ make -s clean all

$ ./tcpdump -#n -E "file tests/esp-secrets.txt" -r tests/espudp1.pcap

1) tcpdump-4.9 branch:

reading from file tests/espudp1.pcap, link-type EN10MB (Ethernet)
==205441==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x5e74f5 in esp_print
...
fxlb added a commit to fxlb/tcpdump that referenced this issue Aug 12, 2022
@fxlb
ESP: Add a workaround to a "use-of-uninitialized-value"
47a7e20 
Found with clang, CFLAGS=-fsanitize=memory.

Fix GitHub issues the-tcpdump-group#848 and the-tcpdump-group#849.

The problem is that for some unknown reason the pt buffer is not
initialized after EVP_DecryptUpdate() call, no error, in:

print-esp.c:260:        if (!EVP_DecryptUpdate(ctx, pt, &len, ct, ctlen)) {
fxlb added a commit to fxlb/tcpdump that referenced this issue Aug 12, 2022
@fxlb
ESP: Add a workaround to a "use-of-uninitialized-value"
b1e423e 
Found with clang, CFLAGS=-fsanitize=memory.

Fix GitHub issues the-tcpdump-group#848 and the-tcpdump-group#849.

The problem is that for some unknown reason the pt buffer is not
initialized after EVP_DecryptUpdate() call, no error, in:

print-esp.c:260:        if (!EVP_DecryptUpdate(ctx, pt, &len, ct, ctlen)) {

(cherry picked from commit 47a7e20)
@fxlb
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fxlb commented Aug 12, 2022

Workaround commited.

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