mirror of
https://github.com/JakeHillion/drgn.git
synced 2024-12-22 01:03:07 +00:00
bdb793508f
Fixes: 5b39bfb547 ("libdrgn: x86_64: avoid recursive address translation for swapper_pg_dir")
Signed-off-by: Omar Sandoval <osandov@osandov.com>
124 lines
3.4 KiB
Plaintext
124 lines
3.4 KiB
Plaintext
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// SPDX-License-Identifier: LGPL-2.1-or-later
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static struct drgn_error *parse_vmcoreinfo_u64(const char *value,
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const char *newline, int base,
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uint64_t *ret)
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{
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errno = 0;
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char *end;
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*ret = strtoull(value, &end, base);
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if (errno == ERANGE) {
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return drgn_error_create(DRGN_ERROR_OVERFLOW,
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"number in VMCOREINFO is too large");
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} else if (errno || end == value || end != newline) {
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return drgn_error_create(DRGN_ERROR_OTHER,
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"number in VMCOREINFO is invalid");
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}
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return NULL;
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}
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struct drgn_error *drgn_program_parse_vmcoreinfo(struct drgn_program *prog,
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const char *desc,
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size_t descsz)
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{
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struct drgn_error *err;
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prog->vmcoreinfo.raw_size = descsz;
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prog->vmcoreinfo.raw = memdup(desc, descsz);
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if (!prog->vmcoreinfo.raw)
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return &drgn_enomem;
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for (const char *line = desc, *end = &desc[descsz], *newline;
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(newline = memchr(line, '\n', end - line));
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line = newline + 1) {
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const char *equals = memchr(line, '=', newline - line);
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if (!equals)
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continue;
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const char *value = equals + 1;
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@memswitch (line, equals - line)@
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@case "CRASHTIME"@
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prog->vmcoreinfo.have_crashtime = true;
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break;
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@case "OSRELEASE"@
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if ((size_t)(newline - value) >=
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sizeof(prog->vmcoreinfo.osrelease)) {
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return drgn_error_create(DRGN_ERROR_OTHER,
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"OSRELEASE in VMCOREINFO is too long");
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}
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memcpy(prog->vmcoreinfo.osrelease, value,
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newline - value);
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prog->vmcoreinfo.osrelease[newline - value] = '\0';
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break;
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@case "PAGESIZE"@
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err = parse_vmcoreinfo_u64(value, newline, 0,
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&prog->vmcoreinfo.page_size);
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if (err)
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return err;
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break;
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@case "KERNELOFFSET"@
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err = parse_vmcoreinfo_u64(value, newline, 16,
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&prog->vmcoreinfo.kaslr_offset);
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if (err)
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return err;
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break;
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@case "SYMBOL(swapper_pg_dir)"@
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err = parse_vmcoreinfo_u64(value, newline, 16,
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&prog->vmcoreinfo.swapper_pg_dir);
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if (err)
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return err;
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break;
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@case "LENGTH(mem_section)"@
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err = parse_vmcoreinfo_u64(value, newline, 0,
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&prog->vmcoreinfo.mem_section_length);
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if (err)
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return err;
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break;
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@case "NUMBER(pgtable_l5_enabled)"@
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{
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uint64_t tmp;
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err = parse_vmcoreinfo_u64(value, newline, 0, &tmp);
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if (err)
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return err;
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prog->vmcoreinfo.pgtable_l5_enabled = tmp;
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break;
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}
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@case "NUMBER(phys_base)"@
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{
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err = parse_vmcoreinfo_u64(value, newline, 0,
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&prog->vmcoreinfo.phys_base);
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if (err)
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return err;
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break;
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}
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@case "NUMBER(KERNELPACMASK)"@
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err = parse_vmcoreinfo_u64(value, newline, 16,
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&prog->aarch64_insn_pac_mask);
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if (err)
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return err;
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break;
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@case "NUMBER(VA_BITS)"@
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err = parse_vmcoreinfo_u64(value, newline, 0,
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&prog->vmcoreinfo.va_bits);
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if (err)
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return err;
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break;
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@endswitch@
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}
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if (!prog->vmcoreinfo.osrelease[0]) {
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return drgn_error_create(DRGN_ERROR_OTHER,
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"VMCOREINFO does not contain valid OSRELEASE");
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}
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if (!is_power_of_two(prog->vmcoreinfo.page_size)) {
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return drgn_error_create(DRGN_ERROR_OTHER,
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"VMCOREINFO does not contain valid PAGESIZE");
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}
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prog->vmcoreinfo.page_shift = ctz(prog->vmcoreinfo.page_size);
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if (!prog->vmcoreinfo.swapper_pg_dir) {
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return drgn_error_create(DRGN_ERROR_OTHER,
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"VMCOREINFO does not contain valid swapper_pg_dir");
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}
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// Everything else is optional.
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return NULL;
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}
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